Re: [PATCH 0/9] mm: Hardened usercopy
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- To: Ingo Molnar <mingo@xxxxxxxxxx>
- Subject: Re: [PATCH 0/9] mm: Hardened usercopy
- From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 8 Jul 2016 09:19:04 -0700
- Cc: Kees Cook <keescook@xxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Casey Schaufler <casey@xxxxxxxxxxxxxxxx>, PaX Team <pageexec@xxxxxxxxxxx>, Brad Spengler <spender@xxxxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Mathias Krause <minipli@xxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Vitaly Wool <vitalywool@xxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "linux-ia64@xxxxxxxxxxxxxxx" <linux-ia64@xxxxxxxxxxxxxxx>, ppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>, sparclinux@xxxxxxxxxxxxxxx, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>, "kernel-hardening@xxxxxxxxxxxxxxxxxx" <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
- In-reply-to: <20160708084639.GA4562@gmail.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <1467843928-29351-1-git-send-email-keescook@chromium.org> <20160708084639.GA4562@gmail.com>
On Fri, Jul 8, 2016 at 1:46 AM, Ingo Molnar <mingo@xxxxxxxxxx> 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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