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ARM64 has asm implementation 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. We can't just remove the asm functions because efistub uses them. And we can't have two non-weak functions either, so declare the asm functions as weak. Link: http://lkml.kernel.org/r/20180920135631.23833-2-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Reported-by: Kyeongdon Kim <kyeongdon.kim@lge.com> Cc: Alexander Potapenko <glider@google.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*
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* Copyright (C) 2013 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_STRING_H
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#define __ASM_STRING_H
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#ifndef CONFIG_KASAN
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#define __HAVE_ARCH_STRRCHR
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extern char *strrchr(const char *, int c);
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#define __HAVE_ARCH_STRCHR
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extern char *strchr(const char *, int c);
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#define __HAVE_ARCH_STRCMP
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extern int strcmp(const char *, const char *);
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#define __HAVE_ARCH_STRNCMP
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extern int strncmp(const char *, const char *, __kernel_size_t);
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#define __HAVE_ARCH_STRLEN
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extern __kernel_size_t strlen(const char *);
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#define __HAVE_ARCH_STRNLEN
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extern __kernel_size_t strnlen(const char *, __kernel_size_t);
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#define __HAVE_ARCH_MEMCMP
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extern int memcmp(const void *, const void *, size_t);
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#define __HAVE_ARCH_MEMCHR
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extern void *memchr(const void *, int, __kernel_size_t);
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#endif
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#define __HAVE_ARCH_MEMCPY
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extern void *memcpy(void *, const void *, __kernel_size_t);
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extern void *__memcpy(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMMOVE
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extern void *memmove(void *, const void *, __kernel_size_t);
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extern void *__memmove(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMSET
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extern void *memset(void *, int, __kernel_size_t);
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extern void *__memset(void *, int, __kernel_size_t);
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#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
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#define __HAVE_ARCH_MEMCPY_FLUSHCACHE
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void memcpy_flushcache(void *dst, const void *src, size_t cnt);
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#endif
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#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
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/*
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* For files that are not instrumented (e.g. mm/slub.c) we
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* should use not instrumented version of mem* functions.
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*/
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#define memcpy(dst, src, len) __memcpy(dst, src, len)
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#define memmove(dst, src, len) __memmove(dst, src, len)
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#define memset(s, c, n) __memset(s, c, n)
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#ifndef __NO_FORTIFY
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#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
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#endif
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#endif
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#endif
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