From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Mon, 31 Mar 2014 15:45:04 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 17149@debbugs.gnu.org X-Debbugs-Original-To: "'bug-coreutils@gnu.org'" Received: via spool by submit@debbugs.gnu.org id=B.139628066725290 (code B ref -1); Mon, 31 Mar 2014 15:45:04 +0000 Received: (at submit) by debbugs.gnu.org; 31 Mar 2014 15:44:27 +0000 Received: from localhost ([127.0.0.1]:58024 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUeNu-0006Zp-AI for submit@debbugs.gnu.org; Mon, 31 Mar 2014 11:44:27 -0400 Received: from eggs.gnu.org ([208.118.235.92]:58551) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUZxf-0006j1-CU for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:01:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WUZxZ-0005zn-FD for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:01:03 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,HTML_MESSAGE, UNPARSEABLE_RELAY autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:33187) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxZ-0005zj-CY for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:00:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60253) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxT-0000fq-Q0 for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WUZxO-0005xi-Dc for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:51 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.152]:49672) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxN-0005xS-Ty for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:46 -0400 Received: from [85.158.139.51:53135] by server-16.bemta-5.messagelabs.com id 78/4E-19700-BDA49335; Mon, 31 Mar 2014 11:00:43 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-9.tower-180.messagelabs.com!1396263641!27573968!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 3321 invoked from network); 31 Mar 2014 11:00:41 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-9.tower-180.messagelabs.com with SMTP; 31 Mar 2014 11:00:41 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Mon, 31 Mar 2014 12:00:41 +0100 From: Rupert Russell Thread-Topic: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7w== Date: Mon, 31 Mar 2014 11:00:40 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: multipart/related; boundary="_004_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_"; type="multipart/alternative" MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Mailman-Approved-At: Mon, 31 Mar 2014 11:44:24 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) --_004_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: multipart/alternative; boundary="_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_" --_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, shred -v /dev/st0 # where /dev/st0 is the drive in a multi tape carouse= l. This starts well with. Pass 1/4 (random) 15MiB Pass 1/4 (random) 41MiB Pass 1/4 (random) 70MiB Pass 1/4 (random).....etc But when the end of a 200GiB tape is reached in pass 1, 'shred' doesn't ap= pear to trigger a rewind or maybe wait for the tape to be rewound before a= ttempting to overwrite the data. The final messages before and around the error are:- Pass 1/4 (random) 190GiB/190GiB 100% Pass 2/4 (random) Error writing at offset 1288. No space left on device. (The next line in my script then runs and unloads the tape.) Is this not rewinding the tape a bug or my mis-use of the 'shred' command?= Thanks Rupert Russell OPERATIONS MANAGER [60-Ilmor-logo-72dpi] Ilmor Engineering Ltd Quarry Road, Brixworth, Northamptonshire, NN6 9UB, UK Direct: +44 (0)1604 799105 Main: +44 (0)1604 799100 Web: www.ilmor.co.uk ______________________________________________________________________ This e-mail may contain confidential and /or privileged information. If yo= u=20 are not the intended recipient (or have received this e-mail in error)plea= se=20 notify the sender immediately and destroy this e-mail. Any unauthorized co= pying,=20 disclosure or distribution of the material in this email is strictly forbi= dden. This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com --_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

shred –v /dev/st0    # where /= dev/st0 is the drive in a multi tape carousel.

 

This starts well with.

Pass 1/4 (random) 15MiB

Pass 1/4 (random) 41MiB

Pass 1/4 (random) 70MiB

Pass 1/4 (random).....etc

 

But when the end of a 200GiB tape is reached in pas= s 1, ‘shred’ doesn’t appear to trigger a rewind or maybe= wait for the tape to be rewound before attempting to overwrite the data.<= o:p>

 

The final messages before and around the error a= re:-

 

Pass 1/4 (random) 190GiB/190GiB  100%<= /o:p>

Pass 2/4 (random)

Error writing at offset 1288. No space left on d= evice.

(The next line in my script then runs and unload= s the tape.)

 

Is this not rewinding the tape a bug or my mis-use = of the ‘shred’ command?

 

Thanks

 

Rupert Russell
OPERATIONS MANAGER

3D"60-Ilmor-logo-72dpi"

Ilmor Engineering Ltd
Quarry Road, Brixworth, Northamptonshire, NN6 9UB, UK

= Direct:     +44 (0)1604 799105
Main:       +44 (0)1604 799100
Web:       www.ilmor.co.uk

 


______________________________________________________________________
=
This e-mail may contain confidential and /or privileged information. If yo= u
are not the intended recipient (or have received this e-mail in error)plea= se
notify the sender immediately and destroy this e-mail. Any unauthorized co= pying,
disclosure or distribution of the material in this email is strictly forbi= dden.

This email has been scanned by the Symantec Email Security.cloud service.<= BR> For more information please visit http://www.symanteccloud.com
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17149-submit@debbugs.gnu.org id=B17149.13962871573595 (code B ref 17149); Mon, 31 Mar 2014 17:33:03 +0000 Received: (at 17149) by debbugs.gnu.org; 31 Mar 2014 17:32:37 +0000 Received: from localhost ([127.0.0.1]:58125 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUg4b-0000vv-5Q for submit@debbugs.gnu.org; Mon, 31 Mar 2014 13:32:37 -0400 Received: from mail3.vodafone.ie ([213.233.128.45]:10993) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUg4Z-0000ve-9D for 17149@debbugs.gnu.org; Mon, 31 Mar 2014 13:32:36 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBACWmOVNtTmjw/2dsb2JhbAANTMQigw6BNoMZAQEBBDIBRhALDQsJFg8JAwIBAgFFBg0BBwEBh3qtTqJmF45/B4Q4AQOfQ45x Received: from unknown (HELO [192.168.1.79]) ([109.78.104.240]) by mail3.vodafone.ie with ESMTP; 31 Mar 2014 18:32:33 +0100 Message-ID: <5339A6B0.4010907@draigBrady.com> Date: Mon, 31 Mar 2014 18:32:32 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) On 03/31/2014 12:00 PM, Rupert Russell wrote: > Hi, > > shred -v /dev/st0 # where /dev/st0 is the drive in a multi tape carousel. > > This starts well with. > Pass 1/4 (random) 15MiB > Pass 1/4 (random) 41MiB > Pass 1/4 (random) 70MiB > Pass 1/4 (random).....etc > > But when the end of a 200GiB tape is reached in pass 1, 'shred' doesn't appear to trigger a rewind or maybe wait for the tape to be rewound before attempting to overwrite the data. > > > The final messages before and around the error are:- > > Pass 1/4 (random) 190GiB/190GiB 100% > > Pass 2/4 (random) > > Error writing at offset 1288. No space left on device. > > (The next line in my script then runs and unloads the tape.) > > Is this not rewinding the tape a bug or my mis-use of the 'shred' command? shred(1) doesn't rewind the tape. It could issue an MTREW ioctl or something, though I suspect there are all sorts of ioctls to consider depending on plaftorm. I also see the `mt erase` command/ioctl which might suffice? If not then explicitly handling the tape like this might suffice? for i in $(seq 3); do mt -f /dev/st0 rewind shred -n1 /dev/st0 done thanks, P�draig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 01:21:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?P=C3=A1draig?= Brady , Rupert Russell Cc: 17149@debbugs.gnu.org Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139631525929564 (code B ref 17149); Tue, 01 Apr 2014 01:21:02 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 01:20:59 +0000 Received: from localhost ([127.0.0.1]:58497 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUnNr-0007gm-11 for submit@debbugs.gnu.org; Mon, 31 Mar 2014 21:20:59 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:52659) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUnNn-0007gc-JX for 17149@debbugs.gnu.org; Mon, 31 Mar 2014 21:20:56 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id AA63039E8014; Mon, 31 Mar 2014 18:20:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7lYU8EZFTWnJ; Mon, 31 Mar 2014 18:20:54 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 4641A39E8013; Mon, 31 Mar 2014 18:20:54 -0700 (PDT) Message-ID: <533A1475.1060809@cs.ucla.edu> Date: Mon, 31 Mar 2014 18:20:53 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> In-Reply-To: <5339A6B0.4010907@draigBrady.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) Pádraig Brady wrote: > shred(1) doesn't rewind the tape. But shred is supposed to rewind the tape, using lseek. Can you find out what system calls are executed? Use the command shred -o tracefile -v /dev/st0 Warning: 'tracefile' will get quite large. The point is to see what happens near the start of execution, and around the time that the write files. My guess is that 'shred' is incorrectly calculating the tape size; it does that by seeking to the end of the tape, and perhaps this is going awry. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 07:23:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 'Paul Eggert' , =?UTF-8?Q?P=C3=A1draig?= Brady Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13963369233482 (code B ref 17149); Tue, 01 Apr 2014 07:23:01 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 07:22:03 +0000 Received: from localhost ([127.0.0.1]:58631 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUt1G-0000u5-JB for submit@debbugs.gnu.org; Tue, 01 Apr 2014 03:22:03 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.109]:40649) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUt1C-0000td-Rj for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 03:22:00 -0400 Received: from [85.158.140.195:64402] by server-5.bemta-14.messagelabs.com id 57/F4-26413-5196A335; Tue, 01 Apr 2014 07:21:57 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-2.tower-193.messagelabs.com!1396336917!4014852!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 18969 invoked from network); 1 Apr 2014 07:21:57 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-2.tower-193.messagelabs.com with SMTP; 1 Apr 2014 07:21:57 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Tue, 1 Apr 2014 08:21:56 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMA== Date: Tue, 1 Apr 2014 07:21:55 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> In-Reply-To: <533A1475.1060809@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) VGhhbmtzIFBhdWwsIAoKSG93ZXZlciwgbXkgZGlzdHJpYnV0aW9uIGRvZXNuJ3QgYXBwZWFyIHRv IGhhdmUgYSAtbyBvcHRpb24uClRyaWVkLCAtbywgLU8gYW5kICwtMCBidXQgYWxsIG5vdCByZWNv Z25pc2VkIG9wdGlvbnMuCgotLXZlcnNpb24gc2F5cyA3LjEgCmNvdXJ0ZXN5IG9uZSBDb2xpbiBQ bHVtYi4KCgoKUnVwZXJ0IFJ1c3NlbGwKT1BFUkFUSU9OUyBNQU5BR0VSCgoKCklsbW9yIEVuZ2lu ZWVyaW5nIEx0ZApRdWFycnkgUm9hZCwgQnJpeHdvcnRoLCBOb3J0aGFtcHRvbnNoaXJlLCBOTjYg OVVCLCBVSwoKRGlyZWN0OsKgwqDCoMKgICs0NCAoMCkxNjA0IDc5OTEwNQpNYWluOsKgwqDCoMKg wqDCoCArNDQgKDApMTYwNCA3OTkxMDAKV2ViOsKgwqDCoMKgwqDCoCB3d3cuaWxtb3IuY28udWsK CgotLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQpGcm9tOiBQYXVsIEVnZ2VydCBbbWFpbHRvOmVn Z2VydEBjcy51Y2xhLmVkdV0gClNlbnQ6IDAxIEFwcmlsIDIwMTQgMDI6MjEKVG86IFDDoWRyYWln IEJyYWR5OyBSdXBlcnQgUnVzc2VsbApDYzogMTcxNDlAZGViYnVncy5nbnUub3JnClN1YmplY3Q6 IFJlOiBidWcjMTcxNDk6IHNocmVkIC0gdGFwZSBkYXRhCgpQw6FkcmFpZyBCcmFkeSB3cm90ZToK PiBzaHJlZCgxKSBkb2Vzbid0IHJld2luZCB0aGUgdGFwZS4KCkJ1dCBzaHJlZCBpcyBzdXBwb3Nl ZCB0byByZXdpbmQgdGhlIHRhcGUsIHVzaW5nIGxzZWVrLgoKQ2FuIHlvdSBmaW5kIG91dCB3aGF0 IHN5c3RlbSBjYWxscyBhcmUgZXhlY3V0ZWQ/ICBVc2UgdGhlIGNvbW1hbmQKCnNocmVkIC1vIHRy YWNlZmlsZSAtdiAvZGV2L3N0MAoKV2FybmluZzogJ3RyYWNlZmlsZScgd2lsbCBnZXQgcXVpdGUg bGFyZ2UuICBUaGUgcG9pbnQgaXMgdG8gc2VlIHdoYXQgaGFwcGVucyBuZWFyIHRoZSBzdGFydCBv ZiBleGVjdXRpb24sIGFuZCBhcm91bmQgdGhlIHRpbWUgdGhhdCB0aGUgd3JpdGUgZmlsZXMuCgpN eSBndWVzcyBpcyB0aGF0ICdzaHJlZCcgaXMgaW5jb3JyZWN0bHkgY2FsY3VsYXRpbmcgdGhlIHRh cGUgc2l6ZTsgaXQgZG9lcyB0aGF0IGJ5IHNlZWtpbmcgdG8gdGhlIGVuZCBvZiB0aGUgdGFwZSwg YW5kIHBlcmhhcHMgdGhpcyBpcyBnb2luZyBhd3J5LgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpUaGlzIGVtYWls IGhhcyBiZWVuIHNjYW5uZWQgYnkgdGhlIFN5bWFudGVjIEVtYWlsIFNlY3VyaXR5LmNsb3VkIHNl cnZpY2UuCkZvciBtb3JlIGluZm9ybWF0aW9uIHBsZWFzZSB2aXNpdCBodHRwOi8vd3d3LnN5bWFu dGVjY2xvdWQuY29tIF9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KClRoaXMgZS1tYWlsIG1h eSBjb250YWluIGNvbmZpZGVudGlhbCBhbmQgL29yIHByaXZpbGVnZWQgaW5mb3JtYXRpb24uIElm IHlvdSAKYXJlIG5vdCB0aGUgaW50ZW5kZWQgcmVjaXBpZW50IChvciBoYXZlIHJlY2VpdmVkIHRo aXMgZS1tYWlsIGluIGVycm9yKXBsZWFzZSAKbm90aWZ5IHRoZSBzZW5kZXIgaW1tZWRpYXRlbHkg YW5kIGRlc3Ryb3kgdGhpcyBlLW1haWwuIEFueSB1bmF1dGhvcml6ZWQgY29weWluZywgCmRpc2Ns b3N1cmUgb3IgZGlzdHJpYnV0aW9uIG9mIHRoZSBtYXRlcmlhbCBpbiB0aGlzIGVtYWlsIGlzIHN0 cmljdGx5IGZvcmJpZGRlbi4KClRoaXMgZW1haWwgaGFzIGJlZW4gc2Nhbm5lZCBieSB0aGUgU3lt YW50ZWMgRW1haWwgU2VjdXJpdHkuY2xvdWQgc2VydmljZS4KRm9yIG1vcmUgaW5mb3JtYXRpb24g cGxlYXNlIHZpc2l0IGh0dHA6Ly93d3cuc3ltYW50ZWNjbG91ZC5jb20K From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 12:19:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13963547089753 (code B ref 17149); Tue, 01 Apr 2014 12:19:02 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 12:18:28 +0000 Received: from localhost ([127.0.0.1]:58915 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUxe8-0002XE-3M for submit@debbugs.gnu.org; Tue, 01 Apr 2014 08:18:28 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.149]:9958) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUxe5-0002X5-RU for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 08:18:26 -0400 Received: from [85.158.139.35:22740] by server-13.bemta-5.messagelabs.com id B9/54-16341-09EAA335; Tue, 01 Apr 2014 12:18:24 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-2.tower-179.messagelabs.com!1396354703!27304078!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 30651 invoked from network); 1 Apr 2014 12:18:23 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-2.tower-179.messagelabs.com with SMTP; 1 Apr 2014 12:18:23 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Tue, 1 Apr 2014 13:18:23 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AACkuCaA= Date: Tue, 1 Apr 2014 12:18:22 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> In-Reply-To: <5339A6B0.4010907@draigBrady.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) P=E1draig, This seems to be getting my task done. for i in $(seq 1 $NUMTAPES) ; do =09=09mtx -f $LOADER load $i =09for j in $(seq 1 $NUMWIPES); do=20 =09=09=09shred -v -n 1 $TAPE =09=09=09mt -f $TAPE rewind =09done =20 =09=09shred -v -z -n 0 $TAPE =09=09mt -f $TAPE rewind =09=09mtx -f $LOADER unload $i done By the way, is there a difference between what these two write to the medi= a? mt -f $TAPE erase and shred -z -n 0 $TAPE Regards Rupert Russell OPERATIONS MANAGER Ilmor Engineering Ltd Quarry Road, Brixworth, Northamptonshire, NN6 9UB, UK Direct:=A0=A0=A0=A0 +44 (0)1604 799105 Main:=A0=A0=A0=A0=A0=A0 +44 (0)1604 799100 Web:=A0=A0=A0=A0=A0=A0 www.ilmor.co.uk -----Original Message----- From: P=E1draig Brady [mailto:P@draigBrady.com]=20 Sent: 31 March 2014 18:33 To: Rupert Russell Cc: 17149@debbugs.gnu.org Subject: Re: bug#17149: shred - tape data On 03/31/2014 12:00 PM, Rupert Russell wrote: > Hi, >=20 > shred -v /dev/st0 # where /dev/st0 is the drive in a multi tape carou= sel. >=20 > This starts well with. > Pass 1/4 (random) 15MiB > Pass 1/4 (random) 41MiB > Pass 1/4 (random) 70MiB > Pass 1/4 (random).....etc >=20 > But when the end of a 200GiB tape is reached in pass 1, 'shred' doesn't = appear to trigger a rewind or maybe wait for the tape to be rewound before= attempting to overwrite the data. >=20 >=20 > The final messages before and around the error are:- >=20 > Pass 1/4 (random) 190GiB/190GiB 100% >=20 > Pass 2/4 (random) >=20 > Error writing at offset 1288. No space left on device. >=20 > (The next line in my script then runs and unloads the tape.) >=20 > Is this not rewinding the tape a bug or my mis-use of the 'shred' comman= d? shred(1) doesn't rewind the tape. It could issue an MTREW ioctl or something, though I suspect there are all= sorts of ioctls to consider depending on plaftorm. I also see the `mt erase` command/ioctl which might suffice? If not then explicitly handling the tape like this might suffice? for i in $(seq 3); do mt -f /dev/st0 rewind shred -n1 /dev/st0 done thanks, P=E1draig. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ___________= ___________________________________________________________ ______________________________________________________________________ This e-mail may contain confidential and /or privileged information. If yo= u=20 are not the intended recipient (or have received this e-mail in error)plea= se=20 notify the sender immediately and destroy this e-mail. Any unauthorized co= pying,=20 disclosure or distribution of the material in this email is strictly forbi= dden. This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 12:39:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: "17149-done@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139635591911828 (code B ref 17149); Tue, 01 Apr 2014 12:39:01 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 12:38:39 +0000 Received: from localhost ([127.0.0.1]:58927 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUxxe-00034h-Me for submit@debbugs.gnu.org; Tue, 01 Apr 2014 08:38:39 -0400 Received: from mail4.vodafone.ie ([213.233.128.170]:8226) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUxxV-00034N-S1 for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 08:38:31 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApMBAEOyOlNtTbrv/2dsb2JhbAANTMRVgw6BM4MZAQEBBDIBRhALDQsJFg8JAwIBAgFFBg0BBwEBh3qtfKNfF45wB4Q4AQOfTY5z Received: from unknown (HELO [192.168.1.79]) ([109.77.186.239]) by mail3.vodafone.ie with ESMTP; 01 Apr 2014 13:38:27 +0100 Message-ID: <533AB343.1020105@draigBrady.com> Date: Tue, 01 Apr 2014 13:38:27 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) On 04/01/2014 01:18 PM, Rupert Russell wrote: > P�draig, > > This seems to be getting my task done. > > for i in $(seq 1 $NUMTAPES) ; do > mtx -f $LOADER load $i > for j in $(seq 1 $NUMWIPES); do > shred -v -n 1 $TAPE > mt -f $TAPE rewind > done > shred -v -z -n 0 $TAPE > mt -f $TAPE rewind > mtx -f $LOADER unload $i > done > > By the way, is there a difference between what these two write to the media? > mt -f $TAPE erase and > shred -z -n 0 $TAPE It depends I suppose. `mt erase` might trigger a command to the hardware to activate a degausser or something, rather than writing zeros, though from a very quick google it defaults to writing zeros. BTW I find this a handy way to see what shred is doing rather than reading the docs: strace -e write shred -s 1K /dev/null thanks, P�draig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 13:52:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139636027019003 (code B ref 17149); Tue, 01 Apr 2014 13:52:01 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 13:51:10 +0000 Received: from localhost ([127.0.0.1]:58984 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUz5p-0004wR-Ag for submit@debbugs.gnu.org; Tue, 01 Apr 2014 09:51:09 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:51537) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUz5m-0004wI-Li for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 09:51:07 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id CAC33A60009; Tue, 1 Apr 2014 06:51:05 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mlQ8gqoS8A7r; Tue, 1 Apr 2014 06:51:05 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 19427A60006; Tue, 1 Apr 2014 06:51:05 -0700 (PDT) Message-ID: <533AC448.1030809@cs.ucla.edu> Date: Tue, 01 Apr 2014 06:51:04 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) Rupert Russell wrote: > shred -o tracefile -v /dev/st0 Ouch, sorry, I meant "strace -o tracefile shred -v /dev/st0". From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 14:40:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 'Paul Eggert' Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139636314528594 (code B ref 17149); Tue, 01 Apr 2014 14:40:02 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 14:39:05 +0000 Received: from localhost ([127.0.0.1]:59447 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUzqC-0007R6-Cd for submit@debbugs.gnu.org; Tue, 01 Apr 2014 10:39:04 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.112]:31039) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUzq5-0007Q6-R1 for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 10:38:58 -0400 Received: from [85.158.140.195:43493] by server-8.bemta-14.messagelabs.com id FE/75-01877-08FCA335; Tue, 01 Apr 2014 14:38:56 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-15.tower-193.messagelabs.com!1396363136!14194284!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 11095 invoked from network); 1 Apr 2014 14:38:56 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-15.tower-193.messagelabs.com with SMTP; 1 Apr 2014 14:38:56 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Tue, 1 Apr 2014 15:38:55 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAAAOVd8A= Date: Tue, 1 Apr 2014 14:38:55 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> In-Reply-To: <533AC448.1030809@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) QWhhLAoKT2ssIEkndmUgYWJvcnRlZCBteSBzY3JpcHQgd2hpY2ggaGFkIG9ubHkgYmVlbiBydW5u aW5nIGEgc2hvcnQgd2hpbGUgYW5kIEknbGwgcnVuIHRoaXMgb3Zlcm5pZ2h0IGFuZCBzZWUgd2hh dCBoYXBwZW5zIGF0IHRoZSBlbmQuCkp1c3QgcmFuIGEgc2hvcnQgdGVzdCBmb3IgYSBmZXcgbWlu dXRlcyAoOTBtYiB3b3J0aCBvbiB0aGUgdGFwZSkgYW5kIHRoZSB0cmFjZWZpbGUgd2FzIHVuZGVy IDNtZWcsIHNvIEkgYW0gaG9waW5nIHRoYXQgbXkgMTQwZ2lnIGF2YWlsYWJsZSBkaXNrc3BhY2Ug d2lsbCBiZSBlbm91Z2guLi4KClJlZ2FyZHMKClJ1cGVydCBSdXNzZWxsCk9QRVJBVElPTlMgTUFO QUdFUgoKCgpJbG1vciBFbmdpbmVlcmluZyBMdGQKUXVhcnJ5IFJvYWQsIEJyaXh3b3J0aCwgTm9y dGhhbXB0b25zaGlyZSwgTk42IDlVQiwgVUsKCkRpcmVjdDrCoMKgwqDCoCArNDQgKDApMTYwNCA3 OTkxMDUKTWFpbjrCoMKgwqDCoMKgwqAgKzQ0ICgwKTE2MDQgNzk5MTAwCldlYjrCoMKgwqDCoMKg wqAgd3d3LmlsbW9yLmNvLnVrCgoKLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0KRnJvbTogUGF1 bCBFZ2dlcnQgW21haWx0bzplZ2dlcnRAY3MudWNsYS5lZHVdIApTZW50OiAwMSBBcHJpbCAyMDE0 IDE0OjUxClRvOiBSdXBlcnQgUnVzc2VsbApDYzogMTcxNDlAZGViYnVncy5nbnUub3JnClN1Ympl Y3Q6IFJlOiBidWcjMTcxNDk6IHNocmVkIC0gdGFwZSBkYXRhCgpSdXBlcnQgUnVzc2VsbCB3cm90 ZToKPiBzaHJlZCAtbyB0cmFjZWZpbGUgLXYgL2Rldi9zdDAKCk91Y2gsIHNvcnJ5LCBJIG1lYW50 ICJzdHJhY2UgLW8gdHJhY2VmaWxlIHNocmVkIC12IC9kZXYvc3QwIi4KCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K VGhpcyBlbWFpbCBoYXMgYmVlbiBzY2FubmVkIGJ5IHRoZSBTeW1hbnRlYyBFbWFpbCBTZWN1cml0 eS5jbG91ZCBzZXJ2aWNlLgpGb3IgbW9yZSBpbmZvcm1hdGlvbiBwbGVhc2UgdmlzaXQgaHR0cDov L3d3dy5zeW1hbnRlY2Nsb3VkLmNvbSBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCgpfX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCgpUaGlz IGUtbWFpbCBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgYW5kIC9vciBwcml2aWxlZ2VkIGluZm9y bWF0aW9uLiBJZiB5b3UgCmFyZSBub3QgdGhlIGludGVuZGVkIHJlY2lwaWVudCAob3IgaGF2ZSBy ZWNlaXZlZCB0aGlzIGUtbWFpbCBpbiBlcnJvcilwbGVhc2UgCm5vdGlmeSB0aGUgc2VuZGVyIGlt bWVkaWF0ZWx5IGFuZCBkZXN0cm95IHRoaXMgZS1tYWlsLiBBbnkgdW5hdXRob3JpemVkIGNvcHlp bmcsIApkaXNjbG9zdXJlIG9yIGRpc3RyaWJ1dGlvbiBvZiB0aGUgbWF0ZXJpYWwgaW4gdGhpcyBl bWFpbCBpcyBzdHJpY3RseSBmb3JiaWRkZW4uCgpUaGlzIGVtYWlsIGhhcyBiZWVuIHNjYW5uZWQg YnkgdGhlIFN5bWFudGVjIEVtYWlsIFNlY3VyaXR5LmNsb3VkIHNlcnZpY2UuCkZvciBtb3JlIGlu Zm9ybWF0aW9uIHBsZWFzZSB2aXNpdCBodHRwOi8vd3d3LnN5bWFudGVjY2xvdWQuY29tCg== From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Tue, 01 Apr 2014 15:32:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13963663151613 (code B ref 17149); Tue, 01 Apr 2014 15:32:02 +0000 Received: (at 17149) by debbugs.gnu.org; 1 Apr 2014 15:31:55 +0000 Received: from localhost ([127.0.0.1]:59521 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WV0fG-0000Po-Gp for submit@debbugs.gnu.org; Tue, 01 Apr 2014 11:31:55 -0400 Received: from mail4.vodafone.ie ([213.233.128.170]:24672) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WV0f9-0000PX-Iv for 17149@debbugs.gnu.org; Tue, 01 Apr 2014 11:31:48 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApQBACbaOlNtTbrv/2dsb2JhbAANTIcivTCDDoEwgxkBAQEEIw8BRhALDQsCAgUhAgIPAkYGDQEHAQGHeq1wdqJKF4EpjUcHgm+BSQEDn02Ocw Received: from unknown (HELO [192.168.1.79]) ([109.77.186.239]) by mail3.vodafone.ie with ESMTP; 01 Apr 2014 16:31:41 +0100 Message-ID: <533ADBDD.80308@draigBrady.com> Date: Tue, 01 Apr 2014 16:31:41 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) On 04/01/2014 03:38 PM, Rupert Russell wrote: > Aha, > > Ok, I've aborted my script which had only been running a short while and I'll run this overnight and see what happens at the end. > Just ran a short test for a few minutes (90mb worth on the tape) and the tracefile was under 3meg, so I am hoping that my 140gig available diskspace will be enough... To save some space you could: strace -e lseek .... Though TBH I think what may be happening is that the lseek() does not rewind the tape at all and only resets the file offset. I also just noticed the `man 4 st` information which suggests that the mt command to rewind the tape might be redundant and the tape would auto rewind anyway when each device was closed. So you could also hack it like: shred -n1 /dev/st0 /dev/st0 /dev/st0 Pádraig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 08:04:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 'Paul Eggert' Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139642579224376 (code B ref 17149); Wed, 02 Apr 2014 08:04:01 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 08:03:12 +0000 Received: from localhost ([127.0.0.1]:60327 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVG8c-0006L5-T5 for submit@debbugs.gnu.org; Wed, 02 Apr 2014 04:03:11 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.150]:6678) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVG8Z-0006Kv-Fy for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 04:03:09 -0400 Received: from [85.158.139.51:52222] by server-14.bemta-5.messagelabs.com id A3/E7-15696-934CB335; Wed, 02 Apr 2014 08:03:05 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-11.tower-180.messagelabs.com!1396425784!24202429!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 6666 invoked from network); 2 Apr 2014 08:03:05 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-11.tower-180.messagelabs.com with SMTP; 2 Apr 2014 08:03:05 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Wed, 2 Apr 2014 09:03:04 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4A= Date: Wed, 2 Apr 2014 08:03:03 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> In-Reply-To: <533AC448.1030809@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) UGF1bCwKCkludGVyZXN0aW5nIGNoYWxsZW5nZSB5b3Ugc2V0IGV4dHJhY3RpbmcgdGhlIGxhc3Qg ZmV3IGxpbmVzIGZyb20gYSA0IGdpZyBmaWxlLCBidXQgSSd2ZSBwYXNzZWQgdGhhdCB0ZXN0IEkg dGhpbmsuIChVc2VkIExlc3MuLikKCgpyZWFkKDMsICJcMzc0XDIwNFwyMzRcMzE3dFxcXDIxNilc MjI0XDIyNWRcMjQ0XDM3MlwzNzQxXDI2NVBcMjAzfVwxNzdcMjI2XDIyNlwyNzNcMjEzVjlcMjA1 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X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 08:15:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139642645425443 (code B ref 17149); Wed, 02 Apr 2014 08:15:01 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 08:14:14 +0000 Received: from localhost ([127.0.0.1]:60333 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVGJI-0006cH-UF for submit@debbugs.gnu.org; Wed, 02 Apr 2014 04:14:13 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.149]:27136) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVGJF-0006c7-9U 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ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Wed, 2 Apr 2014 14:12:13 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAAC/GbaA= Date: Wed, 2 Apr 2014 13:12:12 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> In-Reply-To: <533AC448.1030809@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -0.7 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) U29ycnksIGJ1dCBjdXJpb3NpdHkgZ290IHRoZSBiZXR0ZXIgb2YgbWUgYW5kIEkgZm91bmQgbXlz ZWxmIEdvb2dsaW5nIGZvciBsc2Vlayg0LCAwLCBTRUVLX1NFVCkgICAgICAgICAgICAgICAgICAg CgpBbmQgc29tZWhvdyBJIGFycml2ZWQgaGVyZSwgCgpodHRwczovL2J1Z3MuZGViaWFuLm9yZy9j Z2ktYmluL2J1Z3JlcG9ydC5jZ2k/YnVnPTY5NjMwCgpTZWVtcyBhIGNoYXAgY2FsbGVkIFBhdWwg RWdnZXJ0IGhhcyBkaXNjdXNzZWQgbHNlZWsgYW5kIHplcm8ncyB3aXRoIHRhcGUgZHJpdmVzIG9u Y2UgYmVmb3JlLgpJIHdhcyBhbHNvIGludGVyZXN0ZWQgdGhhdCBkZCBpcyBtZW50aW9uZWQgaW4g dGhlIHNhbWUgYnJlYXRoLCBhbmQgaXQgd2FzIGEgZmFpbGluZyBzY3JpcHQgdXNpbmcgZGQsIHRo YXQgbGVkIG1lIHRvIHNocmVkIGluIHRoZSAxc3QgcGxhY2UuLi4uYWx0aG91Z2ggdGhhdCBmYWls dXJlIHdhcyBwcm9iYWJseSB1bnJlbGF0ZWQuCgpXaGF0IGJ1c3kgY2hhcHMgeW91J3ZlIGJlZW4u CgoKUnVwZXJ0IFJ1c3NlbGwKT1BFUkFUSU9OUyBNQU5BR0VSCgoKCklsbW9yIEVuZ2luZWVyaW5n IEx0ZApRdWFycnkgUm9hZCwgQnJpeHdvcnRoLCBOb3J0aGFtcHRvbnNoaXJlLCBOTjYgOVVCLCBV SwoKRGlyZWN0OsKgwqDCoMKgICs0NCAoMCkxNjA0IDc5OTEwNQpNYWluOsKgwqDCoMKgwqDCoCAr NDQgKDApMTYwNCA3OTkxMDAKV2ViOsKgwqDCoMKgwqDCoCB3d3cuaWxtb3IuY28udWsKCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCgpUaGlzIGUtbWFpbCBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgYW5kIC9vciBw cml2aWxlZ2VkIGluZm9ybWF0aW9uLiBJZiB5b3UgCmFyZSBub3QgdGhlIGludGVuZGVkIHJlY2lw aWVudCAob3IgaGF2ZSByZWNlaXZlZCB0aGlzIGUtbWFpbCBpbiBlcnJvcilwbGVhc2UgCm5vdGlm eSB0aGUgc2VuZGVyIGltbWVkaWF0ZWx5IGFuZCBkZXN0cm95IHRoaXMgZS1tYWlsLiBBbnkgdW5h dXRob3JpemVkIGNvcHlpbmcsIApkaXNjbG9zdXJlIG9yIGRpc3RyaWJ1dGlvbiBvZiB0aGUgbWF0 ZXJpYWwgaW4gdGhpcyBlbWFpbCBpcyBzdHJpY3RseSBmb3JiaWRkZW4uCgpUaGlzIGVtYWlsIGhh cyBiZWVuIHNjYW5uZWQgYnkgdGhlIFN5bWFudGVjIEVtYWlsIFNlY3VyaXR5LmNsb3VkIHNlcnZp Y2UuCkZvciBtb3JlIGluZm9ybWF0aW9uIHBsZWFzZSB2aXNpdCBodHRwOi8vd3d3LnN5bWFudGVj Y2xvdWQuY29tCg== From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 14:56:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139645052310211 (code B ref 17149); Wed, 02 Apr 2014 14:56:01 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 14:55:23 +0000 Received: from localhost ([127.0.0.1]:33060 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVMZV-0002ec-SM for submit@debbugs.gnu.org; Wed, 02 Apr 2014 10:55:22 -0400 Received: from mail3.vodafone.ie ([213.233.128.45]:43266) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVMZS-0002eK-HK for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 10:55:19 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApQBAN8jPFNtTJtA/2dsb2JhbAANTINBg2HAXYE0gxkBAQEDASMPAUYFCwsNCwICBRYLAgIJAwIBAgFFBg0BBwEBh20NCKtydqIwF4EpjUcHgm+BSQSfTY5z Received: from unknown (HELO [192.168.1.79]) ([109.76.155.64]) by mail3.vodafone.ie with ESMTP; 02 Apr 2014 15:55:16 +0100 Message-ID: <533C24D4.3050900@draigBrady.com> Date: Wed, 02 Apr 2014 15:55:16 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) On 04/02/2014 09:03 AM, Rupert Russell wrote: > Paul, > > Interesting challenge you set extracting the last few lines from a 4 gig file, but I've passed that test I think. (Used Less..) > > > read(3, "..., 12288) = 12288 > write(4, "..., 12288) = -1 ENOSPC (No space left on device) So we got ENOSPC and didn't warn about that, but rather just used that info to determine the end of the device. That also implies that the initial lseek (fd, 0, SEEK_END) on the device did return a failure (which we ignored by design). > write(2, "/dev/st0: pass 1/3 (random)...19"..., 48) = 48 > sync() = 0 > lseek(4, 0, SEEK_SET) = 0 We ask here to "rewind", which returns "successfully" > write(2, "/dev/st0: pass 2/3 (random)...", 30) = 30 > read(3, "..., 12288) = 12288 > write(4, "..., 12288) = 12288 I'm a bit surprised this first write passes > read(3, "..., 12288) = 12288 > write(4, "..., 12288) = -1 ENOSPC (No space left on device) > write(2, "/dev/st0: error writing at offse"..., 39) = 39 > write(2, ": No space left on device", 25) = 25 > close(4) = 0 So now we know the size of the device, we correctly warn about this error. The key point is the lseek(4, 0, SEEK_SET) returns success here for the tape device. I guessed that this was by design, but let's just delve into the code a little... http://lxr.linux.no/linux+v3.13.5/drivers/scsi/st.c#L1176 static int st_open(struct inode *inode, struct file *filp) { /* * We really want to do nonseekable_open(inode, filp); here, but some * versions of tar incorrectly call lseek on tapes and bail out if that * fails. So we disallow pread() and pwrite(), but permit lseeks. */ } And the lseek() maps to a noop that just returns the current file pointer. thanks, Pádraig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 16:00:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139645439016966 (code B ref 17149); Wed, 02 Apr 2014 16:00:02 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 15:59:50 +0000 Received: from localhost ([127.0.0.1]:33142 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVNZt-0004PZ-9a for submit@debbugs.gnu.org; Wed, 02 Apr 2014 11:59:49 -0400 Received: from mail1.bemta3.messagelabs.com ([195.245.230.167]:57181) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVNZp-0004PP-SN for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 11:59:47 -0400 Received: from [85.158.137.3:51899] by server-7.bemta-3.messagelabs.com id 7D/99-04151-0F33C335; Wed, 02 Apr 2014 15:59:44 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-3.tower-38.messagelabs.com!1396454383!17345368!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 2749 invoked from network); 2 Apr 2014 15:59:43 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-3.tower-38.messagelabs.com with SMTP; 2 Apr 2014 15:59:43 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Wed, 2 Apr 2014 16:59:43 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4AADHDyAAAEDm8w Date: Wed, 2 Apr 2014 15:59:42 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> In-Reply-To: <533C24D4.3050900@draigBrady.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -0.7 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) UMOhZHJhaWcsCgpTbywgSSB0aGluayB0aGlzIG1lYW5zIHRoZXJlIGlzbid0IGEgYnVnLiBUaGUg YmVoYXZpb3VyIEkgb2JzZXJ2ZSBpcyBmcm9tIGEgZGVjaXNpb24gbWFkZSB0byB3b3JrIGluIHRo 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ZGlzdHJpYnV0aW9uIG9mIHRoZSBtYXRlcmlhbCBpbiB0aGlzIGVtYWlsIGlzIHN0cmljdGx5IGZv cmJpZGRlbi4KClRoaXMgZW1haWwgaGFzIGJlZW4gc2Nhbm5lZCBieSB0aGUgU3ltYW50ZWMgRW1h aWwgU2VjdXJpdHkuY2xvdWQgc2VydmljZS4KRm9yIG1vcmUgaW5mb3JtYXRpb24gcGxlYXNlIHZp c2l0IGh0dHA6Ly93d3cuc3ltYW50ZWNjbG91ZC5jb20K From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 16:32:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell , =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139645630424675 (code B ref 17149); Wed, 02 Apr 2014 16:32:01 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 16:31:44 +0000 Received: from localhost ([127.0.0.1]:33172 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVO4h-0006Pl-6t for submit@debbugs.gnu.org; Wed, 02 Apr 2014 12:31:44 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:40402) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVO4a-0006PW-0Q for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 12:31:37 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id D9D0E39E8008; Wed, 2 Apr 2014 09:31:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VwK2UzDBKyzv; Wed, 2 Apr 2014 09:31:22 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id EDC0239E8018; Wed, 2 Apr 2014 09:31:21 -0700 (PDT) Message-ID: <533C3B59.7060201@cs.ucla.edu> Date: Wed, 02 Apr 2014 09:31:21 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> In-Reply-To: Content-Type: multipart/mixed; boundary="------------010203060500090809080207" X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) This is a multi-part message in MIME format. --------------010203060500090809080207 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Rupert Russell wrote: > I think this means there isn't a bug. Well, it is a bug in the sense that Linux lseek doesn't work on tapes (which POSIX allows), and that 'shred' doesn't work with this. 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18:00:02 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 17:59:34 +0000 Received: from localhost ([127.0.0.1]:33243 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVPRl-0001RV-Tq for submit@debbugs.gnu.org; Wed, 02 Apr 2014 13:59:34 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:46599) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVPRj-0001RK-GN for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 13:59:32 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 1A4C539E8015; Wed, 2 Apr 2014 10:59:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3c98FEvckfXX; Wed, 2 Apr 2014 10:59:21 -0700 (PDT) Received: from penguin.cs.ucla.edu (Penguin.CS.UCLA.EDU [131.179.64.200]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 4F0E839E8008; Wed, 2 Apr 2014 10:59:21 -0700 (PDT) Message-ID: <533C4FF5.80404@cs.ucla.edu> Date: Wed, 02 Apr 2014 10:59:17 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> In-Reply-To: <533C3B59.7060201@cs.ucla.edu> Content-Type: multipart/mixed; boundary="------------040903040105010302080400" X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) This is a multi-part message in MIME format. --------------040903040105010302080400 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 04/02/2014 09:31 AM, Paul Eggert wrote: > Does the attached patch work for you? Oops. that had an incorrect integer overflow check. Attached is an improved version, which uses INT_ADD_OVERFLOW instead of attempting to do it by hand. --------------040903040105010302080400 Content-Type: text/x-patch; name="shred1.diff" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="shred1.diff" diff --git a/src/shred.c b/src/shred.c index 2935409..0a53a16 100644 --- a/src/shred.c +++ b/src/shred.c @@ -80,6 +80,9 @@ #include #include #include +#ifdef __linux__ +# include +#endif #include "system.h" #include "argmatch.h" @@ -379,6 +382,29 @@ direct_mode (int fd, bool enable) #endif } +/* Rewind FD; its status is ST. */ +static bool +dorewind (int fd, struct stat const *st) +{ + if (S_ISCHR (st->st_mode)) + { +#ifdef __linux__ + /* In the Linux kernel, lseek does not work on tape devices; it + returns a randomish value instead. Try the low-level tape + rewind operation first. */ + struct mtop op; + op.mt_op = MTREW; + op.mt_count = 1; + if (ioctl (fd, MTIOCTOP, &op) == 0) + return true; +#endif + } + off_t offset = lseek (fd, 0, SEEK_SET); + if (0 < offset) + errno = EINVAL; + return offset == 0; +} + /* * Do pass number k of n, writing "size" bytes of the given pattern "type" * to the file descriptor fd. Qname, k and n are passed in only for verbose @@ -390,8 +416,9 @@ direct_mode (int fd, bool enable) * Return 1 on write error, -1 on other error, 0 on success. */ static int -dopass (int fd, char const *qname, off_t *sizep, int type, - struct randread_source *s, unsigned long int k, unsigned long int n) +dopass (int fd, struct stat const *st, char const *qname, off_t *sizep, + int type, struct randread_source *s, + unsigned long int k, unsigned long int n) { off_t size = *sizep; off_t offset; /* Current file posiiton */ @@ -427,7 +454,7 @@ dopass (int fd, char const *qname, off_t *sizep, int type, char previous_offset_buf[LONGEST_HUMAN_READABLE + 1]; char const *previous_human_offset IF_LINT ( = 0); - if (lseek (fd, 0, SEEK_SET) == -1) + if (! dorewind (fd, st)) { error (0, errno, _("%s: cannot rewind"), qname); other_error = true; @@ -849,8 +876,6 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, size = flags->size; if (size == -1) { - /* Accept a length of zero only if it's a regular file. - For any other type of file, try to get the size another way. */ if (S_ISREG (st.st_mode)) { size = st.st_size; @@ -859,9 +884,23 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, error (0, 0, _("%s: file has negative size"), qname); return false; } + + if (! flags->exact) + { + off_t remainder = size % ST_BLKSIZE (st); + if (remainder != 0) + { + off_t size_incr = ST_BLKSIZE (st) - remainder; + if (! INT_ADD_OVERFLOW (size, size_incr)) + size += size_incr; + } + } } else { + /* The behavior of lseek is unspecified, but in practice if + it returns a positive number that's the size of this + device. */ size = lseek (fd, 0, SEEK_END); if (size <= 0) { @@ -870,16 +909,6 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, size = -1; } } - - /* Allow 'rounding up' only for regular files. */ - if (0 <= size && !(flags->exact) && S_ISREG (st.st_mode)) - { - size += ST_BLKSIZE (st) - 1 - (size - 1) % ST_BLKSIZE (st); - - /* If in rounding up, we've just overflowed, use the maximum. */ - if (size < 0) - size = TYPE_MAXIMUM (off_t); - } } /* Schedule the passes in random order. */ @@ -890,7 +919,7 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, /* Do the work */ for (i = 0; i < flags->n_iterations; i++) { - int err = dopass (fd, qname, &size, passarray[i], rs, i + 1, n); + int err = dopass (fd, &st, qname, &size, passarray[i], rs, i + 1, n); if (err) { if (err < 0) @@ -908,7 +937,8 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, if (flags->zero_fill) { - int err = dopass (fd, qname, &size, 0, rs, flags->n_iterations + 1, n); + int err = dopass (fd, &st, qname, &size, 0, rs, + flags->n_iterations + 1, n); if (err) { if (err < 0) --------------040903040105010302080400-- From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 02 Apr 2014 18:25:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Paul Eggert Cc: Rupert Russell , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13964630688136 (code B ref 17149); Wed, 02 Apr 2014 18:25:01 +0000 Received: (at 17149) by debbugs.gnu.org; 2 Apr 2014 18:24:28 +0000 Received: from localhost ([127.0.0.1]:33256 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVPpr-000278-Ht for submit@debbugs.gnu.org; Wed, 02 Apr 2014 14:24:27 -0400 Received: from mail6.vodafone.ie ([213.233.128.184]:13261) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVPpp-00026z-7t for 17149@debbugs.gnu.org; Wed, 02 Apr 2014 14:24:26 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApQBAAtVPFNtTJtA/2dsb2JhbAANTA6HFL1Pgw6BN4MZAQEBBCMPAUYQCw0LAgIFFgsCAgkDAgECAUUGDQEHAQGHeqwldqIPF4EpjUcHgm+BSQEDn02OMkE Received: from unknown (HELO [192.168.1.79]) ([109.76.155.64]) by mail3.vodafone.ie with ESMTP; 02 Apr 2014 19:24:23 +0100 Message-ID: <533C55D7.7030008@draigBrady.com> Date: Wed, 02 Apr 2014 19:24:23 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> In-Reply-To: <533C4FF5.80404@cs.ucla.edu> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) On 04/02/2014 06:59 PM, Paul Eggert wrote: > On 04/02/2014 09:31 AM, Paul Eggert wrote: >> Does the attached patch work for you? > Oops. that had an incorrect integer overflow check. Attached is an improved version, which uses INT_ADD_OVERFLOW instead of attempting to do it by hand. I was thinking initially the MTIOCTOP code would be too specific to add to shred, but searching a bit more it seems generic enough to be useful. The code looks good. thanks! Pádraig. From unknown Fri Jun 13 10:41:52 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.503 (Entity 5.503) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: Rupert Russell Subject: bug#17149: closed (Re: bug#17149: shred - tape data) Message-ID: References: <533CFFDF.7070300@cs.ucla.edu> X-Gnu-PR-Message: they-closed 17149 X-Gnu-PR-Package: coreutils Reply-To: 17149@debbugs.gnu.org Date: Thu, 03 Apr 2014 06:31:04 +0000 Content-Type: multipart/mixed; boundary="----------=_1396506664-22536-1" This is a multi-part message in MIME format... ------------=_1396506664-22536-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #17149: shred - tape data which was filed against the coreutils package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 17149@debbugs.gnu.org. --=20 17149: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17149 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1396506664-22536-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 17149-done) by debbugs.gnu.org; 3 Apr 2014 06:30:08 +0000 Received: from localhost ([127.0.0.1]:33609 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVbA6-0005q7-Bz for submit@debbugs.gnu.org; Thu, 03 Apr 2014 02:30:07 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:52747) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVbA1-0005og-Ib for 17149-done@debbugs.gnu.org; Thu, 03 Apr 2014 02:30:02 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 624FC39E8018; Wed, 2 Apr 2014 23:30:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CWHN47FUcU9C; Wed, 2 Apr 2014 23:29:51 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 8274F39E8015; Wed, 2 Apr 2014 23:29:51 -0700 (PDT) Message-ID: <533CFFDF.7070300@cs.ucla.edu> Date: Wed, 02 Apr 2014 23:29:51 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: =?UTF-8?B?UMOhZHJhaWcgQnJhZHk=?= Subject: Re: bug#17149: shred - tape data References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> In-Reply-To: <533C55D7.7030008@draigBrady.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: -2.9 (--) X-Debbugs-Envelope-To: 17149-done Cc: 17149-done@debbugs.gnu.org, Rupert Russell X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) Pádraig Brady wrote: > The code looks good. Thanks for the review. I installed the patch and am marking this bug as done. ------------=_1396506664-22536-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 31 Mar 2014 15:44:27 +0000 Received: from localhost ([127.0.0.1]:58024 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUeNu-0006Zp-AI for submit@debbugs.gnu.org; Mon, 31 Mar 2014 11:44:27 -0400 Received: from eggs.gnu.org ([208.118.235.92]:58551) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WUZxf-0006j1-CU for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:01:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WUZxZ-0005zn-FD for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:01:03 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,HTML_MESSAGE, UNPARSEABLE_RELAY autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:33187) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxZ-0005zj-CY for submit@debbugs.gnu.org; Mon, 31 Mar 2014 07:00:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60253) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxT-0000fq-Q0 for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WUZxO-0005xi-Dc for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:51 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.152]:49672) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WUZxN-0005xS-Ty for bug-coreutils@gnu.org; Mon, 31 Mar 2014 07:00:46 -0400 Received: from [85.158.139.51:53135] by server-16.bemta-5.messagelabs.com id 78/4E-19700-BDA49335; Mon, 31 Mar 2014 11:00:43 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-9.tower-180.messagelabs.com!1396263641!27573968!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 3321 invoked from network); 31 Mar 2014 11:00:41 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-9.tower-180.messagelabs.com with SMTP; 31 Mar 2014 11:00:41 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Mon, 31 Mar 2014 12:00:41 +0100 From: Rupert Russell To: "'bug-coreutils@gnu.org'" Subject: shred - tape data Thread-Topic: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7w== Date: Mon, 31 Mar 2014 11:00:40 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: multipart/related; boundary="_004_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_"; type="multipart/alternative" MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Mon, 31 Mar 2014 11:44:24 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) --_004_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: multipart/alternative; boundary="_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_" --_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, shred -v /dev/st0 # where /dev/st0 is the drive in a multi tape carouse= l. This starts well with. Pass 1/4 (random) 15MiB Pass 1/4 (random) 41MiB Pass 1/4 (random) 70MiB Pass 1/4 (random).....etc But when the end of a 200GiB tape is reached in pass 1, 'shred' doesn't ap= pear to trigger a rewind or maybe wait for the tape to be rewound before a= ttempting to overwrite the data. The final messages before and around the error are:- Pass 1/4 (random) 190GiB/190GiB 100% Pass 2/4 (random) Error writing at offset 1288. No space left on device. (The next line in my script then runs and unloads the tape.) Is this not rewinding the tape a bug or my mis-use of the 'shred' command?= Thanks Rupert Russell OPERATIONS MANAGER [60-Ilmor-logo-72dpi] Ilmor Engineering Ltd Quarry Road, Brixworth, Northamptonshire, NN6 9UB, UK Direct: +44 (0)1604 799105 Main: +44 (0)1604 799100 Web: www.ilmor.co.uk ______________________________________________________________________ This e-mail may contain confidential and /or privileged information. If yo= u=20 are not the intended recipient (or have received this e-mail in error)plea= se=20 notify the sender immediately and destroy this e-mail. Any unauthorized co= pying,=20 disclosure or distribution of the material in this email is strictly forbi= dden. This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com --_000_EBCA174DE7C3144483AD81466F0B1A96184D2D40ILMOREXCH02ilmo_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

shred –v /dev/st0    # where /= dev/st0 is the drive in a multi tape carousel.

 

This starts well with.

Pass 1/4 (random) 15MiB

Pass 1/4 (random) 41MiB

Pass 1/4 (random) 70MiB

Pass 1/4 (random).....etc

 

But when the end of a 200GiB tape is reached in pas= s 1, ‘shred’ doesn’t appear to trigger a rewind or maybe= wait for the tape to be rewound before attempting to overwrite the data.<= o:p>

 

The final messages before and around the error a= re:-

 

Pass 1/4 (random) 190GiB/190GiB  100%<= /o:p>

Pass 2/4 (random)

Error writing at offset 1288. No space left on d= evice.

(The next line in my script then runs and unload= s the tape.)

 

Is this not rewinding the tape a bug or my mis-use = of the ‘shred’ command?

 

Thanks

 

Rupert Russell
OPERATIONS MANAGER

3D"60-Ilmor-logo-72dpi"

Ilmor Engineering Ltd
Quarry Road, Brixworth, Northamptonshire, NN6 9UB, UK

= Direct:     +44 (0)1604 799105
Main:       +44 (0)1604 799100
Web:       www.ilmor.co.uk

 


______________________________________________________________________
=
This e-mail may contain confidential and /or privileged information. If yo= u
are not the intended recipient (or have received this e-mail in error)plea= se
notify the sender immediately and destroy this e-mail. Any unauthorized co= pying,
disclosure or distribution of the material in this email is strictly forbi= dden.

This email has been scanned by the Symantec Email Security.cloud service.<= BR> For more information please visit http://www.symanteccloud.com
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Brady Cc: "17149-done@debbugs.gnu.org" <17149-done@debbugs.gnu.org> Received: via spool by 17149-done@debbugs.gnu.org id=D17149.139651209231738 (code D ref 17149); Thu, 03 Apr 2014 08:02:02 +0000 Received: (at 17149-done) by debbugs.gnu.org; 3 Apr 2014 08:01:32 +0000 Received: from localhost ([127.0.0.1]:33702 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVcaV-0008Fk-Ar for submit@debbugs.gnu.org; Thu, 03 Apr 2014 04:01:31 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.144]:43556) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVcaN-0008FT-Qm for 17149-done@debbugs.gnu.org; Thu, 03 Apr 2014 04:01:24 -0400 Received: from [85.158.139.51:15564] by server-8.bemta-5.messagelabs.com id 83/BC-11310-E451D335; Thu, 03 Apr 2014 08:01:18 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-9.tower-180.messagelabs.com!1396512077!28263166!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 31095 invoked from network); 3 Apr 2014 08:01:17 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-9.tower-180.messagelabs.com with SMTP; 3 Apr 2014 08:01:17 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Thu, 3 Apr 2014 09:01:16 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4AADHDyAAAEDm8w///6ZICAABiSgIAABwOAgADKsoD//9ZdsA== Date: Thu, 3 Apr 2014 08:01:15 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533CFFDF.7070300@cs.ucla.edu> In-Reply-To: <533CFFDF.7070300@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) R2VudHMsCgpUaGFuayB5b3Ugc28gbXVjaCBmb3IgZ2V0dGluZyB0byB0aGUgYm90dG9tIG9mIHRo aXMga25vdHR5IHByb2JsZW0gYW5kIHByb3ZpZGluZyBtZSB3aXRoIGEgc29sdXRpb24uClJlYWxs eSBpbXByZXNzZWQuClBsZWFzZSBhY2NlcHQgaGVybyBzdGF0dXMuCgpyZWdhcmRzCgpSdXBlcnQg UnVzc2VsbApPUEVSQVRJT05TIE1BTkFHRVIKCgoKSWxtb3IgRW5naW5lZXJpbmcgTHRkClF1YXJy eSBSb2FkLCBCcml4d29ydGgsIE5vcnRoYW1wdG9uc2hpcmUsIE5ONiA5VUIsIFVLCgpEaXJlY3Q6 wqDCoMKgwqAgKzQ0ICgwKTE2MDQgNzk5MTA1Ck1haW46wqDCoMKgwqDCoMKgICs0NCAoMCkxNjA0 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bWF5IGNvbnRhaW4gY29uZmlkZW50aWFsIGFuZCAvb3IgcHJpdmlsZWdlZCBpbmZvcm1hdGlvbi4g SWYgeW91IAphcmUgbm90IHRoZSBpbnRlbmRlZCByZWNpcGllbnQgKG9yIGhhdmUgcmVjZWl2ZWQg dGhpcyBlLW1haWwgaW4gZXJyb3IpcGxlYXNlIApub3RpZnkgdGhlIHNlbmRlciBpbW1lZGlhdGVs eSBhbmQgZGVzdHJveSB0aGlzIGUtbWFpbC4gQW55IHVuYXV0aG9yaXplZCBjb3B5aW5nLCAKZGlz Y2xvc3VyZSBvciBkaXN0cmlidXRpb24gb2YgdGhlIG1hdGVyaWFsIGluIHRoaXMgZW1haWwgaXMg c3RyaWN0bHkgZm9yYmlkZGVuLgoKVGhpcyBlbWFpbCBoYXMgYmVlbiBzY2FubmVkIGJ5IHRoZSBT eW1hbnRlYyBFbWFpbCBTZWN1cml0eS5jbG91ZCBzZXJ2aWNlLgpGb3IgbW9yZSBpbmZvcm1hdGlv biBwbGVhc2UgdmlzaXQgaHR0cDovL3d3dy5zeW1hbnRlY2Nsb3VkLmNvbQo= From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Thu, 03 Apr 2014 13:40:04 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Paul Eggert Cc: 17149@debbugs.gnu.org Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13965323614476 (code B ref 17149); Thu, 03 Apr 2014 13:40:04 +0000 Received: (at 17149) by debbugs.gnu.org; 3 Apr 2014 13:39:21 +0000 Received: from localhost ([127.0.0.1]:33811 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVhrT-0001A6-VL for submit@debbugs.gnu.org; Thu, 03 Apr 2014 09:39:20 -0400 Received: from mail1.vodafone.ie ([213.233.128.43]:28744) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVhrK-00019o-PC for 17149@debbugs.gnu.org; Thu, 03 Apr 2014 09:39:12 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApkBAFVjPVNtTYV7/2dsb2JhbAANSw6DM4NhhVy7EIE0gxkBAQEEI1YQCw0EAwECAQkhAgIPAj4IBg0BBQIBARaHZAirI3aidheOYBEHCYJmgUkEhTSLK4E1h3uFRYVTiGJB Received: from unknown (HELO [192.168.1.79]) ([109.77.133.123]) by mail1.vodafone.ie with ESMTP; 03 Apr 2014 14:39:09 +0100 Message-ID: <533D647C.20908@draigBrady.com> Date: Thu, 03 Apr 2014 14:39:08 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533CFFDF.7070300@cs.ucla.edu> In-Reply-To: <533CFFDF.7070300@cs.ucla.edu> X-Enigmail-Version: 1.6 Content-Type: multipart/mixed; boundary="------------050805060703080104070709" X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) This is a multi-part message in MIME format. --------------050805060703080104070709 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 04/03/2014 07:29 AM, Paul Eggert wrote: > Pádraig Brady wrote: >> The code looks good. > > Thanks for the review. I installed the patch and am marking this bug as done. A test needs an adjustment also due to assuming that writing to an empty file was a valid thing for shred to be doing. The attached should fix it up. thanks, Pádraig. --------------050805060703080104070709 Content-Type: text/x-patch; name="shred-fix-test.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="shred-fix-test.patch" >From 8de0db32e546d5a661d6ecde27aef4e5aa6e624f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A1draig=20Brady?= Date: Thu, 3 Apr 2014 13:47:48 +0100 Subject: [PATCH] tests: fix false failure from previous shred change * src/shred.c (do_wipefd): Increase the size to OFF_T_MAX, in the edge case where we do overflow. * NEWS: Mention the shred improvement from the previous fix. * tests/misc/shred-passes.sh: Adjust as we no longer write a BLKSIZE of data for empty files. Prompted by the continuous integration build failure at: http://hydra.nixos.org/build/9974238 --- NEWS | 3 +++ src/shred.c | 2 ++ tests/misc/shred-passes.sh | 10 +++++----- 3 files changed, 10 insertions(+), 5 deletions(-) diff --git a/NEWS b/NEWS index d6aa885..c6451b2 100644 --- a/NEWS +++ b/NEWS @@ -57,6 +57,9 @@ GNU coreutils NEWS -*- outline -*- causing name look-up errors. Also look-ups are first done outside the chroot, in case the look-up within the chroot fails due to library conflicts etc. + shred now supports multiple passes on GNU/Linux tape devices by rewinding + the tape before each pass. Also redundant writes to empty files are avoided. + split avoids unnecessary input buffering, immediately writing input to output which is significant with --filter or when writing to fifos or stdout etc. diff --git a/src/shred.c b/src/shred.c index 0a53a16..8cd1517 100644 --- a/src/shred.c +++ b/src/shred.c @@ -893,6 +893,8 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, off_t size_incr = ST_BLKSIZE (st) - remainder; if (! INT_ADD_OVERFLOW (size, size_incr)) size += size_incr; + else + size = OFF_T_MAX; } } } diff --git a/tests/misc/shred-passes.sh b/tests/misc/shred-passes.sh index bbd1288..268af95 100755 --- a/tests/misc/shred-passes.sh +++ b/tests/misc/shred-passes.sh @@ -20,9 +20,9 @@ print_ver_ shred -# shred a single letter, zero length file which should result in +# shred a single letter, which should result in # 3 random passes and a single rename. -touch f || framework_failure_ +printf 1 > f || framework_failure_ echo "\ shred: f: pass 1/3 (random)... shred: f: pass 2/3 (random)... @@ -35,15 +35,15 @@ shred -v -u f 2>out || fail=1 compare exp out || fail=1 -# Likewise but with --exact to bypass the -# data passes for the zero length file +# Likewise but for a zero length file +# to bypass the data passes touch f || framework_failure_ echo "\ shred: f: removing shred: f: renamed to 0 shred: f: removed" > exp || framework_failure_ -shred -x -v -u f 2>out || fail=1 +shred -v -u f 2>out || fail=1 compare exp out || fail=1 -- 1.7.7.6 --------------050805060703080104070709-- From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Thu, 03 Apr 2014 16:45:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?P=C3=A1draig?= Brady Cc: Rupert Russell , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139654347923951 (code B ref 17149); Thu, 03 Apr 2014 16:45:01 +0000 Received: (at 17149) by debbugs.gnu.org; 3 Apr 2014 16:44:39 +0000 Received: from localhost ([127.0.0.1]:34668 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVkko-0006EC-QL for submit@debbugs.gnu.org; Thu, 03 Apr 2014 12:44:39 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:48559) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVkkm-0006E3-HH for 17149@debbugs.gnu.org; Thu, 03 Apr 2014 12:44:37 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 6873039E8018; Thu, 3 Apr 2014 09:44:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EetiP8EDj3ID; Thu, 3 Apr 2014 09:44:30 -0700 (PDT) Received: from penguin.cs.ucla.edu (Penguin.CS.UCLA.EDU [131.179.64.200]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 9C3B839E8013; Thu, 3 Apr 2014 09:44:30 -0700 (PDT) Message-ID: <533D8FEE.4030801@cs.ucla.edu> Date: Thu, 03 Apr 2014 09:44:30 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> In-Reply-To: <533C55D7.7030008@draigBrady.com> Content-Type: multipart/mixed; boundary="------------060602060105070907080209" X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) This is a multi-part message in MIME format. --------------060602060105070907080209 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit I found a glitch in that previous patch, and installed the attached fixup. --------------060602060105070907080209 Content-Type: text/x-patch; name="0001-shred-shred-one-block-even-for-empty-files.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="0001-shred-shred-one-block-even-for-empty-files.patch" >From 07af4e06f907308e356bb2a7e3b1c2eff6597255 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Thu, 3 Apr 2014 09:42:53 -0700 Subject: [PATCH] shred: shred one block even for empty files * src/shred.c (do_wipefd): Shred one block of empty regular files. This reverts an unintended part of the previous change. --- src/shred.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/shred.c b/src/shred.c index 0a53a16..732d3af 100644 --- a/src/shred.c +++ b/src/shred.c @@ -887,8 +887,11 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, if (! flags->exact) { + /* Round up to the nearest blocksize. If the file is + empty output a block anyway, in case the file system + stores small files in the inode. */ off_t remainder = size % ST_BLKSIZE (st); - if (remainder != 0) + if (remainder != 0 || size == 0) { off_t size_incr = ST_BLKSIZE (st) - remainder; if (! INT_ADD_OVERFLOW (size, size_incr)) -- 1.9.0 --------------060602060105070907080209-- From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 04:41:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Paul Eggert Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13965864613236 (code B ref 17149); Fri, 04 Apr 2014 04:41:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 04:41:01 +0000 Received: from localhost ([127.0.0.1]:34872 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVvw4-0000q0-RF for submit@debbugs.gnu.org; Fri, 04 Apr 2014 00:41:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58959) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVvvz-0000pl-6g for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 00:40:56 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s344ervk003746 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 4 Apr 2014 00:40:54 -0400 Received: from [10.36.116.34] (ovpn-116-34.ams2.redhat.com [10.36.116.34]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s344epBW013861 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Fri, 4 Apr 2014 00:40:52 -0400 Message-ID: <533E37D2.6050108@draigBrady.com> Date: Fri, 04 Apr 2014 05:40:50 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> In-Reply-To: <533D8FEE.4030801@cs.ucla.edu> X-Enigmail-Version: 1.6 Content-Type: multipart/mixed; boundary="------------020402000704040106030708" X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 X-Spam-Score: -5.0 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) This is a multi-part message in MIME format. --------------020402000704040106030708 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 04/03/2014 05:44 PM, Paul Eggert wrote: > I found a glitch in that previous patch, and installed the attached fixup. Actually we shouldn't be doing a data pass for empty files at all. The original version of this utility didn't do that, nor do I see a reason for doing that. So for correctness/consistency reasons, I'm applying the attached. thanks, Pádraig. --------------020402000704040106030708 Content-Type: text/x-patch; name="shred-no-empty.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="shred-no-empty.patch" >From 217618e8bf10a09270291b9825f3181ed2f83dbf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A1draig=20Brady?= Date: Thu, 3 Apr 2014 13:47:48 +0100 Subject: [PATCH] shred: avoid a data pass on empty files * src/shred.c (do_wipefd): Don't increase the size written for an empty file up to a full block. Also increase the size to OFF_T_MAX in the edge case where we do overflow. * NEWS: Mention the shred improvements from recent changes. * tests/misc/shred-passes.sh: Adjust as we no longer write a BLKSIZE of data for empty files. --- NEWS | 3 +++ src/shred.c | 10 +++++----- tests/misc/shred-passes.sh | 10 +++++----- 3 files changed, 13 insertions(+), 10 deletions(-) diff --git a/NEWS b/NEWS index d6aa885..c6451b2 100644 --- a/NEWS +++ b/NEWS @@ -57,6 +57,9 @@ GNU coreutils NEWS -*- outline -*- causing name look-up errors. Also look-ups are first done outside the chroot, in case the look-up within the chroot fails due to library conflicts etc. + shred now supports multiple passes on GNU/Linux tape devices by rewinding + the tape before each pass. Also redundant writes to empty files are avoided. + split avoids unnecessary input buffering, immediately writing input to output which is significant with --filter or when writing to fifos or stdout etc. diff --git a/src/shred.c b/src/shred.c index 732d3af..ed37051 100644 --- a/src/shred.c +++ b/src/shred.c @@ -428,7 +428,7 @@ dopass (int fd, struct stat const *st, char const *qname, off_t *sizep, size_t soff; /* Offset into buffer for next write */ ssize_t ssize; /* Return value from write */ - /* Do nothing for --size=0 or regular empty files with --exact. */ + /* Do nothing for --size=0 or regular empty files. */ if (size == 0) return 0; @@ -887,15 +887,15 @@ do_wipefd (int fd, char const *qname, struct randint_source *s, if (! flags->exact) { - /* Round up to the nearest blocksize. If the file is - empty output a block anyway, in case the file system - stores small files in the inode. */ + /* Round up to the nearest blocksize to clear slack space. */ off_t remainder = size % ST_BLKSIZE (st); - if (remainder != 0 || size == 0) + if (remainder != 0) { off_t size_incr = ST_BLKSIZE (st) - remainder; if (! INT_ADD_OVERFLOW (size, size_incr)) size += size_incr; + else + size = OFF_T_MAX; } } } diff --git a/tests/misc/shred-passes.sh b/tests/misc/shred-passes.sh index bbd1288..268af95 100755 --- a/tests/misc/shred-passes.sh +++ b/tests/misc/shred-passes.sh @@ -20,9 +20,9 @@ print_ver_ shred -# shred a single letter, zero length file which should result in +# shred a single letter, which should result in # 3 random passes and a single rename. -touch f || framework_failure_ +printf 1 > f || framework_failure_ echo "\ shred: f: pass 1/3 (random)... shred: f: pass 2/3 (random)... @@ -35,15 +35,15 @@ shred -v -u f 2>out || fail=1 compare exp out || fail=1 -# Likewise but with --exact to bypass the -# data passes for the zero length file +# Likewise but for a zero length file +# to bypass the data passes touch f || framework_failure_ echo "\ shred: f: removing shred: f: renamed to 0 shred: f: removed" > exp || framework_failure_ -shred -x -v -u f 2>out || fail=1 +shred -v -u f 2>out || fail=1 compare exp out || fail=1 -- 1.7.7.6 --------------020402000704040106030708-- From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Paul Eggert Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 04:54:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?P=C3=A1draig?= Brady Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.13965872004522 (code B ref 17149); Fri, 04 Apr 2014 04:54:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 04:53:20 +0000 Received: from localhost ([127.0.0.1]:34876 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVw7z-0001Ar-JH for submit@debbugs.gnu.org; Fri, 04 Apr 2014 00:53:19 -0400 Received: from smtp.cs.ucla.edu ([131.179.128.62]:58418) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WVw7w-0001Ag-SS for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 00:53:17 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 88B8E39E8019; Thu, 3 Apr 2014 21:53:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8gvbDQ1BuKjU; Thu, 3 Apr 2014 21:53:07 -0700 (PDT) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id EC88639E8013; Thu, 3 Apr 2014 21:53:06 -0700 (PDT) Message-ID: <533E3AAF.4070503@cs.ucla.edu> Date: Thu, 03 Apr 2014 21:53:03 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> <533E37D2.6050108@draigBrady.com> In-Reply-To: <533E37D2.6050108@draigBrady.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Score: -2.9 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.9 (--) Pádraig Brady wrote: > if (! INT_ADD_OVERFLOW (size, size_incr)) > size += size_incr; > + else > + size = OFF_T_MAX; A clearer way to write that would be: size += MIN (size_incr, OFF_T_MAX - size); Otherwise it looks good. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 10:50:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 'Paul Eggert' , =?UTF-8?Q?P=C3=A1draig?= Brady Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139660859711049 (code B ref 17149); Fri, 04 Apr 2014 10:50:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 10:49:57 +0000 Received: from localhost ([127.0.0.1]:34970 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW1h6-0002s8-AG for submit@debbugs.gnu.org; Fri, 04 Apr 2014 06:49:56 -0400 Received: from mail1.bemta3.messagelabs.com ([195.245.230.165]:30598) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW1h1-0002rp-GU for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 06:49:52 -0400 Received: from [85.158.137.19:20848] by server-5.bemta-3.messagelabs.com id 43/2A-18761-D4E8E335; Fri, 04 Apr 2014 10:49:49 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-10.tower-39.messagelabs.com!1396608587!11960114!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 15608 invoked from network); 4 Apr 2014 10:49:47 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-10.tower-39.messagelabs.com with SMTP; 4 Apr 2014 10:49:47 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Fri, 4 Apr 2014 11:49:47 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4AADHDyAAAEDm8w///6ZICAABiSgIAABwOAgAF2bQD//sJuwA== Date: Fri, 4 Apr 2014 10:49:46 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> In-Reply-To: <533D8FEE.4030801@cs.ucla.edu> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -0.7 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) UGF1bCwKCkkgaGF2ZSBhIGNvbmZlc3Npb24gdG8gbWFrZSBhbmQgdGhhdCBpcyBJJ20gbm90IHN1 cmUgcmVhbGx5IGhvdyB0byBkZWFsIHdpdGggdGhlIGRpZmYgZmlsZSBhbmQgbm93IHRoZSBmaXh1 cCBmb3IgdGhlIHBhdGNoLgpHb29nbGluZyBhcm91bmQsIEkgY2FuIHNlZSB0aGF0IApwYXRjaCAt cDEgPCBzaHJlZDEuZGlmZiAKbmVlZHMgdG8gYmUgcnVuIGZyb20gd2hlcmUgdGhlIHNvdXJjZSBy ZXNpZGVzLgpCdXQgdGhlbiBpdCdzIG5vdCBpbW1lZGlhdGVseSBvYnZpb3VzIHRvIG1lLCBhdCBt eSByZWxhdGl2ZWx5IGxpZ2h0IGxldmVsIG9mIExpbnV4IGtub3dsZWRnZSwgaWYgdGhpcyByZXF1 aXJlcyBhIHJlbWFrZSBvciBjb21waWxhdGlvbiBvZiB0aGUga2VybmVsLgpJZiBpdCBkb2VzLCB0 aGVuIGl0J3Mgbm90IHNvbWV0aGluZyBJJ3ZlIGRvbmUgYmVmb3JlLCBhbmQgZGVwZW5kaW5nIG9u IHdoZXJlIEkgcmVhZCwgdGhlIG1ldGhvZHMgZm9yIGRvaW5nIHRoaXMgYXJlbid0IHVuaXZlcnNh bGx5IHRoZSBzYW1lLgoKTWlnaHQgSSBoYXZlIGEgZmV3IHBvaW50ZXJzIHBsZWFzZT8KClRoYW5r IHlvdS4KClJ1cGVydCBSdXNzZWxsCk9QRVJBVElPTlMgTUFOQUdFUgoKCgpJbG1vciBFbmdpbmVl cmluZyBMdGQKUXVhcnJ5IFJvYWQsIEJyaXh3b3J0aCwgTm9ydGhhbXB0b25zaGlyZSwgTk42IDlV QiwgVUsKCkRpcmVjdDrCoMKgwqDCoCArNDQgKDApMTYwNCA3OTkxMDUKTWFpbjrCoMKgwqDCoMKg wqAgKzQ0ICgwKTE2MDQgNzk5MTAwCldlYjrCoMKgwqDCoMKgwqAgd3d3LmlsbW9yLmNvLnVrCgot LS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQpGcm9tOiBQYXVsIEVnZ2VydCBbbWFpbHRvOmVnZ2Vy dEBjcy51Y2xhLmVkdV0gClNlbnQ6IDAzIEFwcmlsIDIwMTQgMTc6NDUKVG86IFDDoWRyYWlnIEJy YWR5CkNjOiBSdXBlcnQgUnVzc2VsbDsgMTcxNDlAZGViYnVncy5nbnUub3JnClN1YmplY3Q6IFJl OiBidWcjMTcxNDk6IHNocmVkIC0gdGFwZSBkYXRhCgpJIGZvdW5kIGEgZ2xpdGNoIGluIHRoYXQg cHJldmlvdXMgcGF0Y2gsIGFuZCBpbnN0YWxsZWQgdGhlIGF0dGFjaGVkIGZpeHVwLgoKCl9fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18KVGhpcyBlbWFpbCBoYXMgYmVlbiBzY2FubmVkIGJ5IHRoZSBTeW1hbnRlYyBFbWFp bCBTZWN1cml0eS5jbG91ZCBzZXJ2aWNlLgpGb3IgbW9yZSBpbmZvcm1hdGlvbiBwbGVhc2Ugdmlz aXQgaHR0cDovL3d3dy5zeW1hbnRlY2Nsb3VkLmNvbSBfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCgpUaGlzIGUtbWFpbCBtYXkgY29udGFpbiBjb25maWRlbnRpYWwgYW5kIC9vciBwcml2aWxl Z2VkIGluZm9ybWF0aW9uLiBJZiB5b3UgCmFyZSBub3QgdGhlIGludGVuZGVkIHJlY2lwaWVudCAo b3IgaGF2ZSByZWNlaXZlZCB0aGlzIGUtbWFpbCBpbiBlcnJvcilwbGVhc2UgCm5vdGlmeSB0aGUg c2VuZGVyIGltbWVkaWF0ZWx5IGFuZCBkZXN0cm95IHRoaXMgZS1tYWlsLiBBbnkgdW5hdXRob3Jp emVkIGNvcHlpbmcsIApkaXNjbG9zdXJlIG9yIGRpc3RyaWJ1dGlvbiBvZiB0aGUgbWF0ZXJpYWwg aW4gdGhpcyBlbWFpbCBpcyBzdHJpY3RseSBmb3JiaWRkZW4uCgpUaGlzIGVtYWlsIGhhcyBiZWVu IHNjYW5uZWQgYnkgdGhlIFN5bWFudGVjIEVtYWlsIFNlY3VyaXR5LmNsb3VkIHNlcnZpY2UuCkZv ciBtb3JlIGluZm9ybWF0aW9uIHBsZWFzZSB2aXNpdCBodHRwOi8vd3d3LnN5bWFudGVjY2xvdWQu Y29tCg== From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 11:04:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139660939412487 (code B ref 17149); Fri, 04 Apr 2014 11:04:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 11:03:14 +0000 Received: from localhost ([127.0.0.1]:34975 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW1ty-0003FK-27 for submit@debbugs.gnu.org; Fri, 04 Apr 2014 07:03:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34997) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW1tu-0003F8-49 for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 07:03:11 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s34B37xl025267 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 4 Apr 2014 07:03:07 -0400 Received: from [10.36.116.38] (ovpn-116-38.ams2.redhat.com [10.36.116.38]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s34B34oH027644 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Fri, 4 Apr 2014 07:03:06 -0400 Message-ID: <533E9168.6020009@draigBrady.com> Date: Fri, 04 Apr 2014 12:03:04 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 X-Spam-Score: -5.0 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) On 04/04/2014 11:49 AM, Rupert Russell wrote: > Paul, > > I have a confession to make and that is I'm not sure really how to deal with the diff file and now the fixup for the patch. > Googling around, I can see that > patch -p1 < shred1.diff > needs to be run from where the source resides. > But then it's not immediately obvious to me, at my relatively light level of Linux knowledge, if this requires a remake or compilation of the kernel. > If it does, then it's not something I've done before, and depending on where I read, the methods for doing this aren't universally the same. > > Might I have a few pointers please? The patch works around the kernel behavior and so no changes are needed there. To compile a new shred binary for testing: mkdir shred-test && cd shred-test wget http://ftp.gnu.org/gnu/coreutils/coreutils-8.22.tar.xz tar -xf coreutils-8.22.tar.xz cd coreutils-8.22 wget 'http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=patch;h=88545ad0' -O- | patch -p1 ./configure --quiet && make -j $(nproc) Now the new shred is available in src/shred. You can run it directly from there or copy to somewhere like /usr/local/bin. cheers, Pádraig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 12:08:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: 'Paul Eggert' , "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139661327724447 (code B ref 17149); Fri, 04 Apr 2014 12:08:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 12:07:57 +0000 Received: from localhost ([127.0.0.1]:35011 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW2ub-0006MC-0J for submit@debbugs.gnu.org; Fri, 04 Apr 2014 08:07:57 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.120]:30768) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW2uX-0006Lz-06 for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 08:07:54 -0400 Received: from [85.158.140.195:6244] by server-16.bemta-14.messagelabs.com id D8/88-16986-790AE335; Fri, 04 Apr 2014 12:07:51 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-10.tower-193.messagelabs.com!1396613270!9642528!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 23491 invoked from network); 4 Apr 2014 12:07:51 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-10.tower-193.messagelabs.com with SMTP; 4 Apr 2014 12:07:51 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Fri, 4 Apr 2014 13:07:50 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4AADHDyAAAEDm8w///6ZICAABiSgIAABwOAgAF2bQD//sJuwIACcIEA///enSA= Date: Fri, 4 Apr 2014 12:07:49 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> <533E9168.6020009@draigBrady.com> In-Reply-To: <533E9168.6020009@draigBrady.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) UMOhZHJhaWcsCgpDb25mZXNzaW9uIG51bWJlciAyLCB0aGUgTGludXggYm94IEkgYW0gdXNpbmcg Zm9yIHRoaXMgdGFzayBpc24ndCBjb25uZWN0ZWQgdG8gdGhlIGludGVybmV0LgpDb3VsZCBydW4g dGhpcyBvbiBhbm90aGVyIExpbnV4IGJveCB0aGF0IGlzIGNvbm5lY3RlZCBhbmQgdHJhbnNmZXIg dGhlIHJlc3VsdGFudCBzaHJlZCBmaWxlIGFjcm9zcyBvbiBhIHN0aWNrPwoKU28gbXVjaCB0byBs ZWFybi4KClJ1cGVydCBSdXNzZWxsCk9QRVJBVElPTlMgTUFOQUdFUgoKCgpJbG1vciBFbmdpbmVl cmluZyBMdGQKUXVhcnJ5IFJvYWQsIEJyaXh3b3J0aCwgTm9ydGhhbXB0b25zaGlyZSwgTk42IDlV QiwgVUsKCkRpcmVjdDrCoMKgwqDCoCArNDQgKDApMTYwNCA3OTkxMDUKTWFpbjrCoMKgwqDCoMKg wqAgKzQ0ICgwKTE2MDQgNzk5MTAwCldlYjrCoMKgwqDCoMKgwqAgd3d3LmlsbW9yLmNvLnVrCgpU aGUgcGF0Y2ggd29ya3MgYXJvdW5kIHRoZSBrZXJuZWwgYmVoYXZpb3IgYW5kIHNvIG5vIGNoYW5n ZXMgYXJlIG5lZWRlZCB0aGVyZS4KVG8gY29tcGlsZSBhIG5ldyBzaHJlZCBiaW5hcnkgZm9yIHRl c3Rpbmc6CgogIG1rZGlyIHNocmVkLXRlc3QgJiYgY2Qgc2hyZWQtdGVzdAogIHdnZXQgaHR0cDov L2Z0cC5nbnUub3JnL2dudS9jb3JldXRpbHMvY29yZXV0aWxzLTguMjIudGFyLnh6CiAgdGFyIC14 ZiBjb3JldXRpbHMtOC4yMi50YXIueHoKICBjZCBjb3JldXRpbHMtOC4yMgogIHdnZXQgJ2h0dHA6 Ly9naXQuc3YuZ251Lm9yZy9naXR3ZWIvP3A9Y29yZXV0aWxzLmdpdDthPXBhdGNoO2g9ODg1NDVh ZDAnIC1PLSB8IHBhdGNoIC1wMQogIC4vY29uZmlndXJlIC0tcXVpZXQgJiYgbWFrZSAtaiAkKG5w cm9jKQoKTm93IHRoZSBuZXcgc2hyZWQgaXMgYXZhaWxhYmxlIGluIHNyYy9zaHJlZC4KWW91IGNh biBydW4gaXQgZGlyZWN0bHkgZnJvbSB0aGVyZSBvciBjb3B5IHRvIHNvbWV3aGVyZSBsaWtlIC91 c3IvbG9jYWwvYmluLgoKY2hlZXJzLApQw6FkcmFpZy4KCgpfX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClRoaXMgZW1h aWwgaGFzIGJlZW4gc2Nhbm5lZCBieSB0aGUgU3ltYW50ZWMgRW1haWwgU2VjdXJpdHkuY2xvdWQg c2VydmljZS4KRm9yIG1vcmUgaW5mb3JtYXRpb24gcGxlYXNlIHZpc2l0IGh0dHA6Ly93d3cuc3lt YW50ZWNjbG91ZC5jb20gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fXwoKX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwoKVGhpcyBlLW1haWwg bWF5IGNvbnRhaW4gY29uZmlkZW50aWFsIGFuZCAvb3IgcHJpdmlsZWdlZCBpbmZvcm1hdGlvbi4g SWYgeW91IAphcmUgbm90IHRoZSBpbnRlbmRlZCByZWNpcGllbnQgKG9yIGhhdmUgcmVjZWl2ZWQg dGhpcyBlLW1haWwgaW4gZXJyb3IpcGxlYXNlIApub3RpZnkgdGhlIHNlbmRlciBpbW1lZGlhdGVs eSBhbmQgZGVzdHJveSB0aGlzIGUtbWFpbC4gQW55IHVuYXV0aG9yaXplZCBjb3B5aW5nLCAKZGlz Y2xvc3VyZSBvciBkaXN0cmlidXRpb24gb2YgdGhlIG1hdGVyaWFsIGluIHRoaXMgZW1haWwgaXMg c3RyaWN0bHkgZm9yYmlkZGVuLgoKVGhpcyBlbWFpbCBoYXMgYmVlbiBzY2FubmVkIGJ5IHRoZSBT eW1hbnRlYyBFbWFpbCBTZWN1cml0eS5jbG91ZCBzZXJ2aWNlLgpGb3IgbW9yZSBpbmZvcm1hdGlv biBwbGVhc2UgdmlzaXQgaHR0cDovL3d3dy5zeW1hbnRlY2Nsb3VkLmNvbQo= From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 12:41:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: Rupert Russell Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139661525728291 (code B ref 17149); Fri, 04 Apr 2014 12:41:02 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 12:40:57 +0000 Received: from localhost ([127.0.0.1]:35018 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW3QV-0007M9-Al for submit@debbugs.gnu.org; Fri, 04 Apr 2014 08:40:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:16117) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW3QM-0007Ls-9s for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 08:40:47 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s34Cehcd001466 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 4 Apr 2014 08:40:43 -0400 Received: from [10.36.116.38] (ovpn-116-38.ams2.redhat.com [10.36.116.38]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s34Ceb0h001571 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Fri, 4 Apr 2014 08:40:42 -0400 Message-ID: <533EA844.30703@draigBrady.com> Date: Fri, 04 Apr 2014 13:40:36 +0100 From: =?UTF-8?Q?P=C3=A1draig?= Brady User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> <533E9168.6020009@draigBrady.com> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 X-Spam-Score: -5.0 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) On 04/04/2014 01:07 PM, Rupert Russell wrote: > Pádraig, > > Confession number 2, the Linux box I am using for this task isn't connected to the internet. > Could run this on another Linux box that is connected and transfer the resultant shred file across on a stick? Probably if the libc's are compat. Otherwise if the tape box has a compiler, you could transfer the patch and tarball and compile there. Otherwise you could look at static compilation on the orig box. Pádraig. From unknown Fri Jun 13 10:41:52 2025 X-Loop: help-debbugs@gnu.org Subject: bug#17149: shred - tape data Resent-From: Rupert Russell Original-Sender: "Debbugs-submit" Resent-CC: bug-coreutils@gnu.org Resent-Date: Fri, 04 Apr 2014 14:51:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17149 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: =?UTF-8?Q?'P=C3=A1draig?= Brady' Cc: "17149@debbugs.gnu.org" <17149@debbugs.gnu.org> Received: via spool by 17149-submit@debbugs.gnu.org id=B17149.139662304910586 (code B ref 17149); Fri, 04 Apr 2014 14:51:01 +0000 Received: (at 17149) by debbugs.gnu.org; 4 Apr 2014 14:50:49 +0000 Received: from localhost ([127.0.0.1]:35491 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW5SC-0002ke-Pz for submit@debbugs.gnu.org; Fri, 04 Apr 2014 10:50:49 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.105]:17757) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WW5S7-0002kN-V1 for 17149@debbugs.gnu.org; Fri, 04 Apr 2014 10:50:46 -0400 Received: from [85.158.140.211:61531] by server-1.bemta-14.messagelabs.com id 7F/DE-00839-2C6CE335; Fri, 04 Apr 2014 14:50:42 +0000 X-Env-Sender: Rupert.Russell@ilmor.co.uk X-Msg-Ref: server-3.tower-194.messagelabs.com!1396623042!12873211!1 X-Originating-IP: [141.0.60.99] X-StarScan-Received: X-StarScan-Version: 6.11.1; banners=ilmor.co.uk,-,- X-VirusChecked: Checked Received: (qmail 29359 invoked from network); 4 Apr 2014 14:50:42 -0000 Received: from unknown.griffin.com (HELO ILMOREXCH02.ilmor.local) (141.0.60.99) by server-3.tower-194.messagelabs.com with SMTP; 4 Apr 2014 14:50:42 -0000 Received: from ILMOREXCH02.ilmor.local ([10.240.26.42]) by ILMOREXCH02.ilmor.local ([10.240.26.42]) with mapi id 14.02.0342.003; Fri, 4 Apr 2014 15:50:41 +0100 From: Rupert Russell Thread-Topic: bug#17149: shred - tape data Thread-Index: Ac9MzVf73cRm+JgLTzGYMmK9s2jn7wAMXh8AABBbYIAADjGZMAAMAZAAACgXp4AADHDyAAAEDm8w///6ZICAABiSgIAABwOAgAF2bQD//sJuwIACcIEA///enSCAADykAP//1ixg Date: Fri, 4 Apr 2014 14:50:41 +0000 Message-ID: References: <5339A6B0.4010907@draigBrady.com> <533A1475.1060809@cs.ucla.edu> <533AC448.1030809@cs.ucla.edu> <533C24D4.3050900@draigBrady.com> <533C3B59.7060201@cs.ucla.edu> <533C4FF5.80404@cs.ucla.edu> <533C55D7.7030008@draigBrady.com> <533D8FEE.4030801@cs.ucla.edu> <533E9168.6020009@draigBrady.com> <533EA844.30703@draigBrady.com> In-Reply-To: <533EA844.30703@draigBrady.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.240.27.103] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) UMOhZHJhaWcuCgpJIGhhZG4ndCByZWFsaXNlZCB0aGF0IHRoZXJlIHdhcyBhIG5ldHdvcmsgY29u bmVjdGlvbiBpbiB3aGVyZSB0aGUgdGFwZSBib3ggaXMsIHNvIG5vdyBjb25uZWN0ZWQgdG8gdGhl IGludGVybmV0LgpJJ3ZlIGdvdCB0aGUgdGFyIGZpbGUgYW5kIHVudGFycmVkIGl0LgpOb3cgSSBn dWVzcyBJIGRvbid0IGNvbXBsZXRlbHkgZm9sbG93IHRoaXMgbGluZTotCndnZXQgJ2h0dHA6Ly9n aXQuc3YuZ251Lm9yZy9naXR3ZWIvP3A9Y29yZXV0aWxzLmdpdDthPXBhdGNoO2g9ODg1NDVhZDAn IC1PLSB8IHBhdGNoIC1wMQoKSSd2ZSB0d28gZmlsZXMgZnJvbSBQYXVsLgpzaHJlZDEuZGlmZgow MDAxLXNocmVkLXNocmVkLW9uZS1ibG9jay1ldmVuLWZvci1lbXB0eS1maWxlcy5wYXRjaAoKRG8g SSBlZGl0IHRoZSB0ZXh0IGluIHRoZSBsaW5lIHdoZXJlIGlzIHNlZSB0aGUgd29yZCBwYXRjaCwg YW5kIGluc2VydCBpbiBib3RoIHBsYWNlcyB0aGUgc2hyZWQxLmRpZmYgZmlsZSBuYW1lPwpUaGVu IGRvIHRoZSBzYW1lIHdpdGggdGhlIDAwMDEtc2hyZWQtc2hyZWQtb25lLWJsb2NrLWV2ZW4tZm9y LWVtcHR5LWZpbGVzLnBhdGNoIGFmdGVyPwoKT3IgLi5ibGluZGluZyBmbGFzaCBvZiBsaWdodC4u IG1heWJlIEkgbmVlZCB0byBhZGQgPCBzaHJlZDEuZGlmZiB0byB0aGUgZW5kIG9mIHRoZSBsaW5l CgpTb3JyeSB0byBiZSBzbyBkaW0sIG11c3QgYmUgbXkgdGltZSBvZiBsaWZlLgoKUnVwZXJ0IFJ1 c3NlbGwKT1BFUkFUSU9OUyBNQU5BR0VSCgoKCklsbW9yIEVuZ2luZWVyaW5nIEx0ZApRdWFycnkg Um9hZCwgQnJpeHdvcnRoLCBOb3J0aGFtcHRvbnNoaXJlLCBOTjYgOVVCLCBVSwoKRGlyZWN0OsKg wqDCoMKgICs0NCAoMCkxNjA0IDc5OTEwNQpNYWluOsKgwqDCoMKgwqDCoCArNDQgKDApMTYwNCA3 OTkxMDAKV2ViOsKgwqDCoMKgwqDCoCB3d3cuaWxtb3IuY28udWsKCgotLS0tLU9yaWdpbmFsIE1l c3NhZ2UtLS0tLQpGcm9tOiBQw6FkcmFpZyBCcmFkeSBbbWFpbHRvOlBAZHJhaWdCcmFkeS5jb21d IApTZW50OiAwNCBBcHJpbCAyMDE0IDEzOjQxClRvOiBSdXBlcnQgUnVzc2VsbApDYzogMTcxNDlA ZGViYnVncy5nbnUub3JnClN1YmplY3Q6IFJlOiBidWcjMTcxNDk6IHNocmVkIC0gdGFwZSBkYXRh CgpPbiAwNC8wNC8yMDE0IDAxOjA3IFBNLCBSdXBlcnQgUnVzc2VsbCB3cm90ZToKPiBQw6FkcmFp ZywKPiAKPiBDb25mZXNzaW9uIG51bWJlciAyLCB0aGUgTGludXggYm94IEkgYW0gdXNpbmcgZm9y IHRoaXMgdGFzayBpc24ndCBjb25uZWN0ZWQgdG8gdGhlIGludGVybmV0Lgo+IENvdWxkIHJ1biB0 aGlzIG9uIGFub3RoZXIgTGludXggYm94IHRoYXQgaXMgY29ubmVjdGVkIGFuZCB0cmFuc2ZlciB0 aGUgcmVzdWx0YW50IHNocmVkIGZpbGUgYWNyb3NzIG9uIGEgc3RpY2s/CgpQcm9iYWJseSBpZiB0 aGUgbGliYydzIGFyZSBjb21wYXQuCk90aGVyd2lzZSBpZiB0aGUgdGFwZSBib3ggaGFzIGEgY29t cGlsZXIsIHlvdSBjb3VsZCB0cmFuc2ZlciB0aGUgcGF0Y2ggYW5kIHRhcmJhbGwgYW5kIGNvbXBp bGUgdGhlcmUuCk90aGVyd2lzZSB5b3UgY291bGQgbG9vayBhdCBzdGF0aWMgY29tcGlsYXRpb24g b24gdGhlIG9yaWcgYm94LgoKUMOhZHJhaWcuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClRoaXMgZW1haWwgaGFz IGJlZW4gc2Nhbm5lZCBieSB0aGUgU3ltYW50ZWMgRW1haWwgU2VjdXJpdHkuY2xvdWQgc2Vydmlj ZS4KRm9yIG1vcmUgaW5mb3JtYXRpb24gcGxlYXNlIHZpc2l0IGh0dHA6Ly93d3cuc3ltYW50ZWNj bG91ZC5jb20gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwoKVGhpcyBlLW1haWwgbWF5IGNv bnRhaW4gY29uZmlkZW50aWFsIGFuZCAvb3IgcHJpdmlsZWdlZCBpbmZvcm1hdGlvbi4gSWYgeW91 IAphcmUgbm90IHRoZSBpbnRlbmRlZCByZWNpcGllbnQgKG9yIGhhdmUgcmVjZWl2ZWQgdGhpcyBl LW1haWwgaW4gZXJyb3IpcGxlYXNlIApub3RpZnkgdGhlIHNlbmRlciBpbW1lZGlhdGVseSBhbmQg ZGVzdHJveSB0aGlzIGUtbWFpbC4gQW55IHVuYXV0aG9yaXplZCBjb3B5aW5nLCAKZGlzY2xvc3Vy ZSBvciBkaXN0cmlidXRpb24gb2YgdGhlIG1hdGVyaWFsIGluIHRoaXMgZW1haWwgaXMgc3RyaWN0 bHkgZm9yYmlkZGVuLgoKVGhpcyBlbWFpbCBoYXMgYmVlbiBzY2FubmVkIGJ5IHRoZSBTeW1hbnRl YyBFbWFpbCBTZWN1cml0eS5jbG91ZCBzZXJ2aWNlLgpGb3IgbW9yZSBpbmZvcm1hdGlvbiBwbGVh c2UgdmlzaXQgaHR0cDovL3d3dy5zeW1hbnRlY2Nsb3VkLmNvbQo=