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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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27f644dc5a
KMSAN must see as many memory accesses as possible to prevent false positive reports. Fall back to versions of memset16()/memset32()/memset64() implemented in lib/string.c instead of those written in assembly. Link: https://lkml.kernel.org/r/20230303141433.3422671-3-glider@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Suggested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Reviewed-by: Marco Elver <elver@google.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Helge Deller <deller@gmx.de> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_STRING_64_H
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#define _ASM_X86_STRING_64_H
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#ifdef __KERNEL__
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#include <linux/jump_label.h>
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/* Written 2002 by Andi Kleen */
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/* Even with __builtin_ the compiler may decide to use the out of line
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function. */
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#if defined(__SANITIZE_MEMORY__) && defined(__NO_FORTIFY)
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#include <linux/kmsan_string.h>
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#endif
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#define __HAVE_ARCH_MEMCPY 1
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extern void *memcpy(void *to, const void *from, size_t len);
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extern void *__memcpy(void *to, const void *from, size_t len);
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#define __HAVE_ARCH_MEMSET
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void *memset(void *s, int c, size_t n);
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void *__memset(void *s, int c, size_t n);
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/*
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* KMSAN needs to instrument as much code as possible. Use C versions of
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* memsetXX() from lib/string.c under KMSAN.
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*/
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#if !defined(CONFIG_KMSAN)
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#define __HAVE_ARCH_MEMSET16
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static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosw"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#define __HAVE_ARCH_MEMSET32
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static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosl"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#define __HAVE_ARCH_MEMSET64
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static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
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{
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long d0, d1;
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asm volatile("rep\n\t"
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"stosq"
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: "=&c" (d0), "=&D" (d1)
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: "a" (v), "1" (s), "0" (n)
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: "memory");
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return s;
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}
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#endif
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#define __HAVE_ARCH_MEMMOVE
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void *memmove(void *dest, const void *src, size_t count);
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void *__memmove(void *dest, const void *src, size_t count);
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int memcmp(const void *cs, const void *ct, size_t count);
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size_t strlen(const char *s);
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char *strcpy(char *dest, const char *src);
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char *strcat(char *dest, const char *src);
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int strcmp(const char *cs, const char *ct);
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#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
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#define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
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void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
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static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
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{
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if (__builtin_constant_p(cnt)) {
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switch (cnt) {
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case 4:
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asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
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return;
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case 8:
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asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
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return;
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case 16:
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asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
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asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
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return;
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}
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}
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__memcpy_flushcache(dst, src, cnt);
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_STRING_64_H */
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