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Date: Fri, 7 Sep 2018 15:56:05 +0100 From: Will Deacon <will.deacon@....com> To: Andrey Ryabinin <aryabinin@...tuozzo.com> Cc: Catalin Marinas <catalin.marinas@....com>, Andrew Morton <akpm@...ux-foundation.org>, Kyeongdon Kim <kyeongdon.kim@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] arm64: lib: use C string functions with KASAN enabled. On Thu, Sep 06, 2018 at 08:05:33PM +0300, Andrey Ryabinin wrote: > ARM64 has asm implementations of memchr(), memcmp(), str[r]chr(), > str[n]cmp(), str[n]len(). KASAN don't see memory accesses in asm > code, thus it can potentially miss many bugs. > > Ifdef out __HAVE_ARCH_* defines of these functions when KASAN is > enabled, so the generic implementations from lib/string.c will be used. > > Declare asm functions as weak instead of removing them because they > still can be used by efistub. I don't understand this bit: efistub uses the __pi_ prefixed versions of the routines, so why do we need to declare them as weak? Will
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