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Date: Tue, 30 Jan 2018 23:21:58 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Borislav Petkov <bp@alien8.de>
cc: Tim Chen <tim.c.chen@linux.intel.com>,
    Josh Poimboeuf <jpoimboe@redhat.com>, David Woodhouse <dwmw@amazon.co.uk>,
    arjan@linux.intel.com, karahmed@amazon.de, x86@kernel.org,
    linux-kernel@vger.kernel.org, peterz@infradead.org, pbonzini@redhat.com,
    ak@linux.intel.com, torvalds@linux-foundation.org,
    gregkh@linux-foundation.org, mingo@kernel.org, luto@kernel.org,
    linux@dominikbrodowski.net
Subject: Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier
 in context switch
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On Tue, 30 Jan 2018, Borislav Petkov wrote:

> On Tue, Jan 30, 2018 at 01:23:17PM -0800, Tim Chen wrote:
> > I'm less familiar with gpg-agent.  Dave was the one who
> > put in comments about gpg-agent in this patch so perhaps
> > he can comment.
> 
> So I looked at gpg-agent and AFAICT, it disables core dumping with
> setrlimit().

setrlimit() does not end up fiddling with the dumpable bits in
mm->flags. So no.

> I wasn't able to attach to it either with gdb but didn't find where we
> disable the attaching, for the couple of minutes I grepped through it.

prctl(PR_SET_DUMPABLE, 0)               = 0

That does the trick.

Thanks,

	tglx