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Date: Thu, 4 Oct 2018 09:47:25 +0200 (CEST)
From: Jiri Kosina <>
To: Jann Horn <>
cc: Casey Schaufler <>, 
    Kernel Hardening <>, 
    kernel list <>, 
    linux-security-module <>,, Dave Hansen <>,,, 
    Arjan van de Ven <>
Subject: Re: [PATCH v5 2/5] Smack: Prepare for PTRACE_MODE_SCHED

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?


Jiri Kosina

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