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fortify: Use __diagnose_as() for better diagnostic coverage
In preparation for using Clang's __pass_object_size, add __diagnose_as() attributes to mark the functions as being the same as the indicated builtins. When __daignose_as() is available, Clang will have a more complete ability to apply its own diagnostic analysis to callers of these functions, as if they were the builtins themselves. Without __diagnose_as, Clang's compile time diagnostic messages won't be as precise as they could be, but at least users of older toolchains will still benefit from having fortified routines. Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20220208225350.1331628-7-keescook@chromium.org
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1 changed files with 14 additions and 7 deletions
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@ -50,7 +50,8 @@ extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size)
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#define __underlying_strncpy __builtin_strncpy
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#endif
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__FORTIFY_INLINE char *strncpy(char * const p, const char *q, __kernel_size_t size)
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__FORTIFY_INLINE __diagnose_as(__builtin_strncpy, 1, 2, 3)
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char *strncpy(char * const p, const char *q, __kernel_size_t size)
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{
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size_t p_size = __builtin_object_size(p, 1);
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@ -61,7 +62,8 @@ __FORTIFY_INLINE char *strncpy(char * const p, const char *q, __kernel_size_t si
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return __underlying_strncpy(p, q, size);
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}
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__FORTIFY_INLINE char *strcat(char * const p, const char *q)
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__FORTIFY_INLINE __diagnose_as(__builtin_strcat, 1, 2)
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char *strcat(char * const p, const char *q)
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{
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size_t p_size = __builtin_object_size(p, 1);
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@ -94,7 +96,8 @@ __FORTIFY_INLINE __kernel_size_t strnlen(const char * const p, __kernel_size_t m
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}
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/* defined after fortified strnlen to reuse it. */
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__FORTIFY_INLINE __kernel_size_t strlen(const char * const p)
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__FORTIFY_INLINE __diagnose_as(__builtin_strlen, 1)
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__kernel_size_t strlen(const char * const p)
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{
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__kernel_size_t ret;
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size_t p_size = __builtin_object_size(p, 1);
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@ -183,7 +186,8 @@ __FORTIFY_INLINE ssize_t strscpy(char * const p, const char * const q, size_t si
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}
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/* defined after fortified strlen and strnlen to reuse them */
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__FORTIFY_INLINE char *strncat(char * const p, const char * const q, __kernel_size_t count)
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__FORTIFY_INLINE __diagnose_as(__builtin_strncat, 1, 2, 3)
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char *strncat(char * const p, const char * const q, __kernel_size_t count)
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{
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size_t p_len, copy_len;
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size_t p_size = __builtin_object_size(p, 1);
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@ -365,7 +369,8 @@ __FORTIFY_INLINE void *memscan(void * const p, int c, __kernel_size_t size)
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return __real_memscan(p, c, size);
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}
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__FORTIFY_INLINE int memcmp(const void * const p, const void * const q, __kernel_size_t size)
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__FORTIFY_INLINE __diagnose_as(__builtin_memcmp, 1, 2, 3)
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int memcmp(const void * const p, const void * const q, __kernel_size_t size)
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{
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size_t p_size = __builtin_object_size(p, 0);
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size_t q_size = __builtin_object_size(q, 0);
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@ -381,7 +386,8 @@ __FORTIFY_INLINE int memcmp(const void * const p, const void * const q, __kernel
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return __underlying_memcmp(p, q, size);
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}
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__FORTIFY_INLINE void *memchr(const void * const p, int c, __kernel_size_t size)
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__FORTIFY_INLINE __diagnose_as(__builtin_memchr, 1, 2, 3)
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void *memchr(const void * const p, int c, __kernel_size_t size)
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{
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size_t p_size = __builtin_object_size(p, 0);
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@ -417,7 +423,8 @@ __FORTIFY_INLINE void *kmemdup(const void * const p, size_t size, gfp_t gfp)
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}
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/* Defined after fortified strlen to reuse it. */
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__FORTIFY_INLINE char *strcpy(char * const p, const char * const q)
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__FORTIFY_INLINE __diagnose_as(__builtin_strcpy, 1, 2)
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char *strcpy(char * const p, const char * const q)
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{
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size_t p_size = __builtin_object_size(p, 1);
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size_t q_size = __builtin_object_size(q, 1);
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