Re: [PATCH v5 2/5] Smack: Prepare for PTRACE_MODE_SCHED

From: Jiri Kosina
Date: Thu Oct 04 2018 - 03:47:45 EST


On Thu, 27 Sep 2018, Jann Horn wrote:

> > Yes. Since the PTRACE_MODE_NOAUDIT was in PTRACE_MODE_IBPB in Jiri's
> > previous patch set and not in PTRACE_MODE_SCHED in this one I assumed
> > that there was a good reason for it.
>
> Jiri, was there a good reason for it, and if so, what was it?

[ FWIW PTRACE_MODE_NOAUDIT being in PTRACE_MODE_IBPB goes back to original
Tim's pre-CRD patchset ]

Well, we can't really call out into audit from scheduler code, and the
previous versions of the patchsets didn't have PTRACE_MODE_SCHED, so it
had to be included in PTRACE_MODE_IBPB in order to make sure we're not
calling into audit from context switch code.

Or did I misunderstand the question?

Thanks,

--
Jiri Kosina
SUSE Labs