linux-ext4 - Re: [PATCH] fscrypto: add authorization check for setting encryption policy

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Date:   Fri, 9 Sep 2016 21:03:35 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Eric Biggers <ebiggers@...gle.com>, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs@...r.kernel.org
Subject: Re: [PATCH] fscrypto: add authorization check for setting encryption
 policy

On Fri, Sep 09, 2016 at 11:37:59PM -0400, Theodore Ts'o wrote:
> On Thu, Sep 08, 2016 at 10:57:08AM -0700, Eric Biggers wrote:
> > On an ext4 or f2fs filesystem with file encryption supported, a user
> > could set an encryption policy on any empty directory(*) to which they
> > had readonly access.  This is obviously problematic, since such a
> > directory might be owned by another user and the new encryption policy
> > would prevent that other user from creating files in their own directory
> > (for example).
> > 
> > Fix this by requiring inode_owner_or_capable() permission to set an
> > encryption policy.  This means that either the caller must own the file,
> > or the caller must have the capability CAP_FOWNER.
> > 
> > (*) Or also on any regular file, for f2fs v4.6 and later and ext4
> >     v4.8-rc1 and later; a separate bug fix is coming for that.
> > 
> > Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> > Cc: stable@...r.kernel.org # 4.1+; check fs/{ext4,f2fs}
> 
> Thanks, applied.  (Jaeguk, I plan to send this to Linus via the
> ext4.git tree as a fix for v4.8)

Sure, no problem.

> 
> 					- Ted
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