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@xxxxxxxxxx>
> > Cc: stable@xxxxxxxxxxxxxxx # 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
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
