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Date: Thu, 7 Jul 2016 21:34:53 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Kees Cook <keescook@...omium.org> cc: LKML <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>, "x86@...nel.org" <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, "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, sparclinux <sparclinux@...r.kernel.org>, linux-arch <linux-arch@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH 1/9] mm: Hardened usercopy On Thu, 7 Jul 2016, Kees Cook wrote: > On Thu, Jul 7, 2016 at 3:42 AM, Thomas Gleixner <tglx@...utronix.de> wrote: > > I'd rather make that a weak function returning 1 which can be replaced by > > x86 for CONFIG_FRAME_POINTER=y. That also allows other architectures to > > implement their specific frame checks. > > Yeah, though I prefer CONFIG-controlled stuff over weak functions, but > I agree, something like arch_check_stack_frame(...) or similar. I'll > build something for this on the next revision. I'm fine with CONFIG_CONTROLLED as long as the ifdeffery is limited to header files. Thanks, tglx
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