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Date: Fri, 8 Jul 2016 09:19:04 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Rik van Riel <riel@...hat.com>, 
	Casey Schaufler <casey@...aufler-ca.com>, PaX Team <pageexec@...email.hu>, 
	Brad Spengler <spender@...ecurity.net>, Russell King <linux@...linux.org.uk>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, 
	Ard Biesheuvel <ard.biesheuvel@...aro.org>, 
	Benjamin Herrenschmidt <benh@...nel.crashing.org>, Michael Ellerman <mpe@...erman.id.au>, 
	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, 
	"David S. Miller" <davem@...emloft.net>, "the arch/x86 maintainers" <x86@...nel.org>, Christoph Lameter <cl@...ux.com>, 
	Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, 
	Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>, Mathias Krause <minipli@...glemail.com>, 
	Jan Kara <jack@...e.cz>, Vitaly Wool <vitalywool@...il.com>, 
	Andrea Arcangeli <aarcange@...hat.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Laura Abbott <labbott@...oraproject.org>, 
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>, ppc-dev <linuxppc-dev@...ts.ozlabs.org>, 
	sparclinux@...r.kernel.org, 
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, 
	"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Thomas Gleixner <tglx@...utronix.de>, 
	"H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 0/9] mm: Hardened usercopy

On Fri, Jul 8, 2016 at 1:46 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> Could you please try to find some syscall workload that does many small user
> copies and thus excercises this code path aggressively?

Any stat()-heavy path will hit cp_new_stat() very heavily. Think the
usual kind of "traverse the whole tree looking for something". "git
diff" will do it, just checking that everything is up-to-date.

That said, other things tend to dominate.

                 Linus

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