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Message-ID: <alpine.DEB.2.20.1801302309440.2293@nanos>
Date: Tue, 30 Jan 2018 23:21:58 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Borislav Petkov <bp@...en8.de>
cc: Tim Chen <tim.c.chen@...ux.intel.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
David Woodhouse <dwmw@...zon.co.uk>, arjan@...ux.intel.com,
karahmed@...zon.de, x86@...nel.org, linux-kernel@...r.kernel.org,
peterz@...radead.org, pbonzini@...hat.com, ak@...ux.intel.com,
torvalds@...ux-foundation.org, gregkh@...ux-foundation.org,
mingo@...nel.org, luto@...nel.org, linux@...inikbrodowski.net
Subject: Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier
in context switch
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
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