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)
- Ted
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