linux-kernel - Re: Btrfs v0.14 Released

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Date:	Thu, 01 May 2008 15:27:16 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	jeffschroeder@...puter.org, linux-fsdevel@...r.kernel.org,
	kernel-team@...ts.ubuntu.com, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org
Subject: Re: Btrfs v0.14 Released

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Chris Mason wrote:
> On Thursday 01 May 2008, Tim Gardner wrote:
> 
> [ btrfs oops on ubuntu ]
> 
>>>>  This is because ubuntu kernels ship with apparmor, you'll need this
>>>> patch:
>>>>
>>>>  If there is a #ifdef IM_A_UBUNTU_KERNEL I can use, I'll do it.  Jeff
>>>> Mahoney has a similar patch for SUSE that I've been meaning to merge,
>>>> but I wanted to lookup some way to check for ubuntu as well.
>>>>
>>>>  -chris
>>>>
>>>>  diff -r e7da2489b19b file.c
>>>>  --- a/file.c    Wed Apr 30 13:59:35 2008 -0400
>>>>  +++ b/file.c    Thu May 01 12:25:11 2008 -0400
>>>>  @@ -852,7 +852,7 @@ static ssize_t btrfs_file_write(struct f
>>>>                 goto out_nolock;
>>>>         if (count == 0)
>>>>                 goto out_nolock;
>>>>  -       err = remove_suid(fdentry(file));
>>>>  +       err = remove_suid(&file->f_path);
>>>>         if (err)
>>>>                 goto out_nolock;
>>>>         file_update_time(file);
>> Couldn't you #ifdef based on CONFIG_SECURITY_APPARMOR ? This ought to
>> work for Hardy. However the next development kernel (Intrepid) does not
>> have the APPARMOR patches, so just knowing that its an UBUNTU kernel is
>> not specific enough.
> 
> I've been assuming the apparmor patches change remove_suid even when they are 
> not enabled in the config.

Yeah, unless Ubuntu is doing some magic with the function arguments
(which sounds like the fix is worse than the problem), this is true.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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