[PATCH v2 04/10] ovl: make ioctl() safe
miklos at szeredi.hu
Thu Dec 10 15:19:19 UTC 2020
On Wed, Dec 9, 2020 at 3:01 AM James Morris <jmorris at namei.org> wrote:
> On Mon, 7 Dec 2020, Miklos Szeredi wrote:
> > ovl_ioctl_set_flags() does a capability check using flags, but then the
> > real ioctl double-fetches flags and uses potentially different value.
> > The "Check the capability before cred override" comment misleading: user
> > can skip this check by presenting benign flags first and then overwriting
> > them to non-benign flags.
> Is this a security bug which should be fixed in stable?
Yes, good point. Added Cc: stable at ...
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