linux-kernel - Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier in context switch

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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