From debbugs-submit-bounces@debbugs.gnu.org Sun Jul 31 08:47:14 2016 Received: (at submit) by debbugs.gnu.org; 31 Jul 2016 12:47:14 +0000 Received: from localhost ([127.0.0.1]:51985 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTq9C-0008A2-Lp for submit@debbugs.gnu.org; Sun, 31 Jul 2016 08:47:14 -0400 Received: from eggs.gnu.org ([208.118.235.92]:54194) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTq9B-00089q-QN for submit@debbugs.gnu.org; Sun, 31 Jul 2016 08:47:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bTq95-0004vq-SN for submit@debbugs.gnu.org; Sun, 31 Jul 2016 08:47:08 -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,FREEMAIL_FROM, T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:41682) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bTq95-0004vl-PZ for submit@debbugs.gnu.org; Sun, 31 Jul 2016 08:47:07 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45158) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bTq93-0003rk-MS for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2016 08:47:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bTq8z-0004vQ-Il for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2016 08:47:04 -0400 Received: from mail-pf0-x244.google.com ([2607:f8b0:400e:c00::244]:34494) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bTq8z-0004vM-As for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2016 08:47:01 -0400 Received: by mail-pf0-x244.google.com with SMTP id g202so8487920pfb.1 for ; Sun, 31 Jul 2016 05:47:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:date:message-id:mime-version; bh=VoT5n+v2IaCscqcyeLkCCz82mxoTD/vnSNiJaCg1eIM=; b=arRndn4tXJjijKuwcT26g61mW0tmq96TGhKZE8VzEO2Ht72wkH8UVO83TPxjKb5f1N t18qMPSu7XO4Z2uEn5FLCQHDf1lGd/SRtvQnEHORcY21sIct+uRLuQm6X5bQ7jslBfbl 0m5aEx9eGtih3lRJ+4sf5M5GIexWDPm8P8x4Ka5QkZRW2QCm23zOzka+1tb9qJVOhneO 5EBzwy1iW4Goat/4FZBjZvyd0s/SvKT6hAH3aAIlTxkIjoUEsPjNIavHKNr1shMSQ/NR sIIsh4OIQqeh+nJk8UbSokuo/3fm/370KGkvCQb6XMbyQi7zRDgGXM9QG6AWV6d+h4IZ 8cLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:mime-version; bh=VoT5n+v2IaCscqcyeLkCCz82mxoTD/vnSNiJaCg1eIM=; b=WrTUgsfhS0Mi33UMfCG56/kXf5MrQ9o5Lp/4DVueh4v9z2HIfEOcsOxGOzH1LCJqkk 014ilZ6TrWFRpBepcvOrWIMbGVDpjGD9DvQEg62GT6P/xpYddqkC/xhESjL1YhHCuqa1 oM68ecSvOv1BUtHtjSvcCOkY6Sw/U8HIgNwbeir+++Lic6VUJI9GqsSuLcyjthj6k4Q3 4WgT5bYh+ypsobexOuPJfw34zQUxceQTgQXrmHh4GBwcGjtzdQhkjbMZZHWe2tBmUd52 N7lfsvXrGif6Lcr1e4WwSou5THVMiY2Exogr3ZmYethYFSO/6/9VtoK+xmXsUTExx9sz 01qw== X-Gm-Message-State: AEkoousEv0j+PoAAmlNBZoY2f6s7M4SqHt3L7wV/rsffrZVGFlZmp6hXKAz3EKy6ZoQSsA== X-Received: by 10.98.155.17 with SMTP id r17mr86302496pfd.24.1469969219708; Sun, 31 Jul 2016 05:46:59 -0700 (PDT) Received: from tpx ([209.141.62.125]) by smtp.gmail.com with ESMTPSA id wp4sm38213646pab.15.2016.07.31.05.46.57 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 31 Jul 2016 05:46:58 -0700 (PDT) From: Chris Feng To: bug-gnu-emacs@gnu.org Subject: 25.1; [PATCH] Fix a possible crash caused by mapcar1 Date: Sun, 31 Jul 2016 20:46:50 +0800 Message-ID: <86fuqq2cw5.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 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: -4.0 (----) Processing a list with `mapcar' or `mapconcat' can be terminated early when the list is tampered (as shown in the following example), and as a result we'll be dealing with uninitialized memory which will likely trigger a crash. (setq a (make-list 10 0)) (mapcar (lambda (_) (setcdr a nil)) a) Chris --- * src/fns.c (mapcar1): Check and reset uninitialized list elements. --- src/fns.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/fns.c b/src/fns.c index d5a1f74..1804bce 100644 --- a/src/fns.c +++ b/src/fns.c @@ -2524,6 +2524,10 @@ mapcar1 (EMACS_INT leni, Lisp_Object *vals, Lisp_Object fn, Lisp_Object seq) vals[i] = dummy; tail = XCDR (tail); } + + /* In case the list was tampered and the loop terminated early. */ + if (i < leni) + memclear (vals + i, (leni - i) * word_size); } } -- 2.8.1 From debbugs-submit-bounces@debbugs.gnu.org Sun Jul 31 09:18:13 2016 Received: (at 24118) by debbugs.gnu.org; 31 Jul 2016 13:18:13 +0000 Received: from localhost ([127.0.0.1]:52002 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTqdB-0000Rt-EI for submit@debbugs.gnu.org; Sun, 31 Jul 2016 09:18:13 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:37757) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTqd9-0000Rk-Hw for 24118@debbugs.gnu.org; Sun, 31 Jul 2016 09:18:12 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3s2NLp3zMVz3hjJn; Sun, 31 Jul 2016 15:18:10 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3s2NLp2H7Lzvkq7; Sun, 31 Jul 2016 15:18:10 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id AtRIxMMcQs_P; Sun, 31 Jul 2016 15:18:09 +0200 (CEST) X-Auth-Info: WJH677wRXwe7G3D4/loIVDctm67QOFst6r/oIzSI0IcVk60LTzAq6XiGgHFgFpTj Received: from igel.home (ppp-88-217-24-60.dynamic.mnet-online.de [88.217.24.60]) by mail.mnet-online.de (Postfix) with ESMTPA; Sun, 31 Jul 2016 15:18:09 +0200 (CEST) Received: by igel.home (Postfix, from userid 1000) id 450DF2C255D; Sun, 31 Jul 2016 15:18:09 +0200 (CEST) From: Andreas Schwab To: Chris Feng Subject: Re: bug#24118: 25.1; [PATCH] Fix a possible crash caused by mapcar1 References: <86fuqq2cw5.fsf@gmail.com> X-Yow: This is PLEASANT! Date: Sun, 31 Jul 2016 15:18:09 +0200 In-Reply-To: <86fuqq2cw5.fsf@gmail.com> (Chris Feng's message of "Sun, 31 Jul 2016 20:46:50 +0800") Message-ID: <87vazmj69a.fsf@linux-m68k.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 24118 Cc: 24118@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 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 (/) Chris Feng writes: > diff --git a/src/fns.c b/src/fns.c > index d5a1f74..1804bce 100644 > --- a/src/fns.c > +++ b/src/fns.c > @@ -2524,6 +2524,10 @@ mapcar1 (EMACS_INT leni, Lisp_Object *vals, Lisp_Object fn, Lisp_Object seq) > vals[i] = dummy; > tail = XCDR (tail); > } > + > + /* In case the list was tampered and the loop terminated early. */ > + if (i < leni) > + memclear (vals + i, (leni - i) * word_size); That should not depend on the representation of Qnil. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." From debbugs-submit-bounces@debbugs.gnu.org Sun Jul 31 09:33:37 2016 Received: (at 24118) by debbugs.gnu.org; 31 Jul 2016 13:33:37 +0000 Received: from localhost ([127.0.0.1]:52011 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTqs5-0000p1-4O for submit@debbugs.gnu.org; Sun, 31 Jul 2016 09:33:37 -0400 Received: from mail-pf0-f171.google.com ([209.85.192.171]:33721) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bTqs3-0000oo-Ei for 24118@debbugs.gnu.org; Sun, 31 Jul 2016 09:33:35 -0400 Received: by mail-pf0-f171.google.com with SMTP id y134so46549467pfg.0 for <24118@debbugs.gnu.org>; Sun, 31 Jul 2016 06:33:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=nXUw0eL0vuhudLNW6klJI/J3Q892L9NMUPwVtVSMawE=; b=oqBE0kmTJEr49YUN35izvkCBdwHD1q9FlbJvoXbOg9I0fY4BU4K7k4V/wT+mCxXNpt 7yOt/swAMdDsT0Dp5oenDBO1ZVPY5Eg9d1ZzQ1s+giqYGQ7EtRVsjO3W9estzJ9xALZx C1INLhN4j8z8x09bBMFRhgUWwsC1pMc8Caa5RFpYmuTWcW2cHsD2oiILgxA75seo7Fyx E02LOhDBQk1AprQV6EZbZHNPqz8xdkMEduTrsr637WkiSJoEAvhf8eJ6rhkse/FiJ2Un 481xGo3VmktNDEDyRxJK3NCHYFL8JxSDhjCevmiQwWcNIO8jlVo5E8KpKPJL940MDt7L PBXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=nXUw0eL0vuhudLNW6klJI/J3Q892L9NMUPwVtVSMawE=; b=aBxwjznFHTLsT9YLWa68Y/ouSGITwzdhnBh2k0wWnKyLzT0O4bXsy1bFq6X8iCbm8G lClK/SrsiuRoXRJVJnN5EAZyLWHIJbyUGqalcJvnHqIHZ0ng1USA5VtTrwTh7DUNcMCH QiXCjYrljolEBefn2a9fyFV5tyk07uFa49fh5Uq4xwTREy6a/GHENAjqV8A1ilk+l4P6 23GTuqHka/yuQiTDnb7pPdKwzLW09TRw9lWV3iovnpilqJBJvX4aGldiaE5Ozuq/eBKU V+ICI4kUfc44eQnxxjEsZUR9vzt7CguGhzc71JulC/nQnJy99cEiljoaeH3jFeFfloKc Ax6w== X-Gm-Message-State: AEkoout91jj9He9vpjd+pqbKqWy+fI9xwMuwZskpcBiasD4Jd3sPYhw/fjZ3tJhOSmh/EA== X-Received: by 10.98.69.201 with SMTP id n70mr87903447pfi.64.1469972009755; Sun, 31 Jul 2016 06:33:29 -0700 (PDT) Received: from tpx ([209.141.62.125]) by smtp.gmail.com with ESMTPSA id tr1sm21261345pab.19.2016.07.31.06.33.27 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 31 Jul 2016 06:33:28 -0700 (PDT) From: Chris Feng To: Andreas Schwab Subject: Re: bug#24118: 25.1; [PATCH] Fix a possible crash caused by mapcar1 References: <86fuqq2cw5.fsf@gmail.com> <87vazmj69a.fsf@linux-m68k.org> Date: Sun, 31 Jul 2016 21:33:25 +0800 In-Reply-To: <87vazmj69a.fsf@linux-m68k.org> (Andreas Schwab's message of "Sun, 31 Jul 2016 15:18:09 +0200") Message-ID: <86h9b6j5ju.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 24118 Cc: 24118@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 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 (/) Andreas Schwab writes: > That should not depend on the representation of Qnil. I think the result is undefined. I set it to Qnil because it was before 60d1b18. Chris From debbugs-submit-bounces@debbugs.gnu.org Tue Aug 02 21:16:03 2016 Received: (at 24118-done) by debbugs.gnu.org; 3 Aug 2016 01:16:03 +0000 Received: from localhost ([127.0.0.1]:53954 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bUkmx-00061R-F7 for submit@debbugs.gnu.org; Tue, 02 Aug 2016 21:16:03 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:40278) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bUkmu-00060h-Tg for 24118-done@debbugs.gnu.org; Tue, 02 Aug 2016 21:16:01 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 10DC0161196; Tue, 2 Aug 2016 18:15:55 -0700 (PDT) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id zXZ0lj8E4EmM; Tue, 2 Aug 2016 18:15:54 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 10105161220; Tue, 2 Aug 2016 18:15:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id t3UMtmUHaMmO; Tue, 2 Aug 2016 18:15:53 -0700 (PDT) Received: from [192.168.1.9] (unknown [100.32.155.148]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id E1C77161196; Tue, 2 Aug 2016 18:15:53 -0700 (PDT) To: Chris Feng From: Paul Eggert Subject: Re: 25.1; [PATCH] Fix a possible crash caused by mapcar1 Organization: UCLA Computer Science Department Message-ID: <8ad02288-7280-31c3-1a74-12a677107ca9@cs.ucla.edu> Date: Tue, 2 Aug 2016 18:15:53 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="------------31AB2BD2E5BED9724559CC08" X-Spam-Score: -1.2 (-) X-Debbugs-Envelope-To: 24118-done Cc: Andreas Schwab , 24118-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 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: -1.2 (-) This is a multi-part message in MIME format. --------------31AB2BD2E5BED9724559CC08 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Thanks for the bug report. I installed the attached more-adventurous patc= h,=20 which truncates the result rather than extending it with nils. This seems= a bit=20 more appropriate anyway. Although it no longer matters for this patch, memclear is specified to st= ore nil=20 values regardless of how nil is represented. Of course memclear's current= =20 implementation assumes Qnil is zero, and memclear can't be portably and e= asily=20 implemented if we merely change Qnil to be nonzero, but that's a bridge w= e don't=20 have to cross unless we change Qnil to be nonzero. --------------31AB2BD2E5BED9724559CC08 Content-Type: text/plain; charset=UTF-8; name="0001-Fix-mapcar-F-S-crash-when-F-alters-S-s-length.txt" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="0001-Fix-mapcar-F-S-crash-when-F-alters-S-s-length.txt" RnJvbSBhZTc3YzA3YjM5OWExOTRiZGI3MDk1ODIzNTk1MDg2ZjgzODVmMmE0IE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBQYXVsIEVnZ2VydCA8ZWdnZXJ0QGNzLnVjbGEuZWR1 PgpEYXRlOiBUdWUsIDIgQXVnIDIwMTYgMjE6MDQ6MjggLTA0MDAKU3ViamVjdDogW1BBVENI XSA9P1VURi04P3E/Rml4PTIwKG1hcGNhcj0yMEY9MjBTKT0yMGNyYXNoPTIwd2hlbj0yMEY9 MjBhbHQ/PQogPT9VVEYtOD9xP2Vycz0yMFM9RTI9ODA9OTlzPTIwbGVuZ3RoPz0KTUlNRS1W ZXJzaW9uOiAxLjAKQ29udGVudC1UeXBlOiB0ZXh0L3BsYWluOyBjaGFyc2V0PVVURi04CkNv 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Date: Wed, 31 Aug 2016 11:24:03 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator