GNU bug report logs - #11696
Bug found in Putty linux

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Vai Dy <vaidydeepak <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: Bug found in Putty linux
Date: Wed, 13 Jun 2012 16:15:26 +0530

[Message part 1 (text/plain, inline)]

Hi,

   Currently i'm using putty 0-55 version. Just clarify me whether its a
bug or not .

1)Creating a directory
2)Removing all the permission like read, write and execute for owners ,
groups and users.
3)If i try to delete the file what would be the output ?

Thanks!
Vaidyanathan.S

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Message #8 received at 11696 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Vai Dy <vaidydeepak <at> gmail.com>
Cc: 11696 <at> debbugs.gnu.org
Subject: Re: bug#11696: Bug found in Putty linux
Date: Wed, 13 Jun 2012 17:44:21 +0100

tags 11696 + notabug
close 11696
stop

On 06/13/2012 11:45 AM, Vai Dy wrote:
> Hi,
> 
>    Currently i'm using putty 0-55 version. Just clarify me whether its a
> bug or not .

Note putty is just a program on your windows system to access the linux system.
You can see what linux system you're on with: lsb_release -d
You can see what version of rm you're using with: rm --version

> 1)Creating a directory
> 2)Removing all the permission like read, write and execute for owners ,
> groups and users.
> 3)If i try to delete the file what would be the output ?

You should be able to remove the file or dir.

The dir permissions control operations on
files/dirs within the directory, rather than the directory itself.

cheers,
Pádraig.

Message #13 received at 11696-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Vai Dy <vaidydeepak <at> gmail.com>
Cc: 11696-done <at> debbugs.gnu.org
Subject: Re: bug#11696: Bug found in Putty linux
Date: Wed, 13 Jun 2012 10:56:17 -0600

[Message part 1 (text/plain, inline)]

tag 11696 notabug
thanks

On 06/13/2012 04:45 AM, Vai Dy wrote:
> Hi,
> 
>    Currently i'm using putty 0-55 version. Just clarify me whether its a
> bug or not .
> 
> 1)Creating a directory
> 2)Removing all the permission like read, write and execute for owners ,
> groups and users.
> 3)If i try to delete the file what would be the output ?

Thanks for the report.  It helps if you show the actual commands you
typed, the actual results you got, and what you were expecting instead,
before claiming that something is a bug.  Although your details are
sparse, I think you are asking about:

$ mkdir foo
$ touch bar
$ chmod a-rwx foo bar
$ ls -ld foo bar .
----------. 1 eblake eblake    0 Jun 13 10:51 bar
d---------. 2 eblake eblake 4096 Jun 13 10:25 foo
drwxr-xr-x. 22 eblake eblake 4096 Jun 13 10:52 .
$ rm -rf foo bar
$ echo $?
0

That is correct POSIX behavior, and makes perfect sense (deleting a file
does not require permissions on the file itself, but on the container
that you are deleting it from, and '.' is still writable).  I'm going to
close this as not a bug for now, but feel free to continue to post if
you have more details, and we can reopen if necessary.

-- 
Eric Blake   eblake <at> redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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Message #18 received at 11696 <at> debbugs.gnu.org (full text, mbox):

From: Bob Proulx <bob <at> proulx.com>
To: Vai Dy <vaidydeepak <at> gmail.com>, 11696 <at> debbugs.gnu.org
Subject: Re: bug#11696: Bug found in Putty linux
Date: Fri, 15 Jun 2012 14:17:13 -0600

Pádraig Brady wrote:
> Vai Dy wrote:
> >    Currently i'm using putty 0-55 version. Just clarify me whether its a
> > bug or not .

It's not a bug.  But it might be unexpected to you.  It is expected
according to interpretation of the permissions.

> Note putty is just a program on your windows system to access the linux system.
> You can see what linux system you're on with: lsb_release -d
> You can see what version of rm you're using with: rm --version

Yes.

> > 1)Creating a directory
> > 2)Removing all the permission like read, write and execute for owners ,
> > groups and users.
> > 3)If i try to delete the file what would be the output ?
> 
> You should be able to remove the file or dir.

Well...  Not quite.  It depends upon the details.  For example:

  $ mkdir xx
  $ mkdir xx/yy
  $ chmod 0 xx
  $ ll -dog xx
  d--------- 3 4096 Jun 15 14:08 xx
  $ rm -rf xx
  rm: cannot remove `xx': Permission denied

But that is expected behavior given those permission.  This is not a
bug in rm.  This is simply following the instructions when you removed
all permissions from the directory.  That is an unusual case but one
that was actively instructed and so must be respected.

To revert the permissions to something reasonable so that they can be
removed you can do something like this:

  $ chmod -R u+rwX xx
  $ rm -rf xx

Bob

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