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302 lines
9.0 KiB
302 lines
9.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_FORTIFY_STRING_H_ |
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#define _LINUX_FORTIFY_STRING_H_ |
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
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extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); |
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extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp); |
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extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy); |
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extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove); |
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extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset); |
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extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat); |
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extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy); |
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extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen); |
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extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat); |
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extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy); |
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#else |
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#define __underlying_memchr __builtin_memchr |
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#define __underlying_memcmp __builtin_memcmp |
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#define __underlying_memcpy __builtin_memcpy |
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#define __underlying_memmove __builtin_memmove |
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#define __underlying_memset __builtin_memset |
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#define __underlying_strcat __builtin_strcat |
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#define __underlying_strcpy __builtin_strcpy |
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#define __underlying_strlen __builtin_strlen |
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#define __underlying_strncat __builtin_strncat |
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#define __underlying_strncpy __builtin_strncpy |
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#endif |
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__FORTIFY_INLINE char *strncpy(char *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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if (__builtin_constant_p(size) && p_size < size) |
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__write_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __underlying_strncpy(p, q, size); |
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} |
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__FORTIFY_INLINE char *strcat(char *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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if (p_size == (size_t)-1) |
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return __underlying_strcat(p, q); |
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if (strlcat(p, q, p_size) >= p_size) |
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fortify_panic(__func__); |
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return p; |
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} |
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__FORTIFY_INLINE __kernel_size_t strlen(const char *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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/* Work around gcc excess stack consumption issue */ |
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if (p_size == (size_t)-1 || |
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(__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0')) |
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return __underlying_strlen(p); |
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ret = strnlen(p, p_size); |
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if (p_size <= ret) |
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fortify_panic(__func__); |
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return ret; |
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} |
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extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen); |
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__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen) |
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{ |
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size_t p_size = __builtin_object_size(p, 1); |
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__kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size); |
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if (p_size <= ret && maxlen != ret) |
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fortify_panic(__func__); |
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return ret; |
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} |
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/* defined after fortified strlen to reuse it */ |
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extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy); |
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__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size) |
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{ |
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size_t ret; |
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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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if (p_size == (size_t)-1 && q_size == (size_t)-1) |
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return __real_strlcpy(p, q, size); |
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ret = strlen(q); |
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if (size) { |
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size_t len = (ret >= size) ? size - 1 : ret; |
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if (__builtin_constant_p(len) && len >= p_size) |
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__write_overflow(); |
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if (len >= p_size) |
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fortify_panic(__func__); |
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__underlying_memcpy(p, q, len); |
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p[len] = '\0'; |
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} |
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return ret; |
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} |
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/* defined after fortified strnlen to reuse it */ |
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extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(strscpy); |
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__FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size) |
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{ |
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size_t len; |
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/* Use string size rather than possible enclosing struct size. */ |
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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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/* If we cannot get size of p and q default to call strscpy. */ |
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if (p_size == (size_t) -1 && q_size == (size_t) -1) |
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return __real_strscpy(p, q, size); |
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/* |
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* If size can be known at compile time and is greater than |
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* p_size, generate a compile time write overflow error. |
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*/ |
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if (__builtin_constant_p(size) && size > p_size) |
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__write_overflow(); |
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/* |
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* This call protects from read overflow, because len will default to q |
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* length if it smaller than size. |
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*/ |
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len = strnlen(q, size); |
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/* |
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* If len equals size, we will copy only size bytes which leads to |
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* -E2BIG being returned. |
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* Otherwise we will copy len + 1 because of the final '\O'. |
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*/ |
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len = len == size ? size : len + 1; |
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/* |
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* Generate a runtime write overflow error if len is greater than |
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* p_size. |
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*/ |
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if (len > p_size) |
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fortify_panic(__func__); |
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/* |
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* We can now safely call vanilla strscpy because we are protected from: |
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* 1. Read overflow thanks to call to strnlen(). |
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* 2. Write overflow thanks to above ifs. |
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*/ |
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return __real_strscpy(p, q, len); |
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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 *p, const char *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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size_t q_size = __builtin_object_size(q, 1); |
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if (p_size == (size_t)-1 && q_size == (size_t)-1) |
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return __underlying_strncat(p, q, count); |
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p_len = strlen(p); |
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copy_len = strnlen(q, count); |
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if (p_size < p_len + copy_len + 1) |
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fortify_panic(__func__); |
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__underlying_memcpy(p + p_len, q, copy_len); |
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p[p_len + copy_len] = '\0'; |
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return p; |
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} |
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__FORTIFY_INLINE void *memset(void *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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if (__builtin_constant_p(size) && p_size < size) |
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__write_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __underlying_memset(p, c, size); |
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} |
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__FORTIFY_INLINE void *memcpy(void *p, const void *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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if (__builtin_constant_p(size)) { |
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if (p_size < size) |
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__write_overflow(); |
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if (q_size < size) |
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__read_overflow2(); |
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} |
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if (p_size < size || q_size < size) |
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fortify_panic(__func__); |
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return __underlying_memcpy(p, q, size); |
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} |
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__FORTIFY_INLINE void *memmove(void *p, const void *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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if (__builtin_constant_p(size)) { |
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if (p_size < size) |
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__write_overflow(); |
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if (q_size < size) |
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__read_overflow2(); |
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} |
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if (p_size < size || q_size < size) |
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fortify_panic(__func__); |
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return __underlying_memmove(p, q, size); |
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} |
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extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan); |
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__FORTIFY_INLINE void *memscan(void *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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if (__builtin_constant_p(size) && p_size < size) |
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__read_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __real_memscan(p, c, size); |
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} |
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__FORTIFY_INLINE int memcmp(const void *p, const void *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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if (__builtin_constant_p(size)) { |
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if (p_size < size) |
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__read_overflow(); |
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if (q_size < size) |
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__read_overflow2(); |
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} |
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if (p_size < size || q_size < size) |
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fortify_panic(__func__); |
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return __underlying_memcmp(p, q, size); |
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} |
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__FORTIFY_INLINE void *memchr(const void *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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if (__builtin_constant_p(size) && p_size < size) |
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__read_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __underlying_memchr(p, c, size); |
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} |
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void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv); |
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__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size) |
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{ |
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size_t p_size = __builtin_object_size(p, 0); |
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if (__builtin_constant_p(size) && p_size < size) |
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__read_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __real_memchr_inv(p, c, size); |
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} |
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extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup); |
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__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp) |
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{ |
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size_t p_size = __builtin_object_size(p, 0); |
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if (__builtin_constant_p(size) && p_size < size) |
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__read_overflow(); |
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if (p_size < size) |
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fortify_panic(__func__); |
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return __real_kmemdup(p, size, gfp); |
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} |
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/* defined after fortified strlen and memcpy to reuse them */ |
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__FORTIFY_INLINE char *strcpy(char *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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size_t q_size = __builtin_object_size(q, 1); |
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size_t size; |
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if (p_size == (size_t)-1 && q_size == (size_t)-1) |
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return __underlying_strcpy(p, q); |
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size = strlen(q) + 1; |
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/* test here to use the more stringent object size */ |
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if (p_size < size) |
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fortify_panic(__func__); |
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memcpy(p, q, size); |
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return p; |
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} |
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/* Don't use these outside the FORITFY_SOURCE implementation */ |
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#undef __underlying_memchr |
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#undef __underlying_memcmp |
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#undef __underlying_memcpy |
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#undef __underlying_memmove |
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#undef __underlying_memset |
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#undef __underlying_strcat |
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#undef __underlying_strcpy |
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#undef __underlying_strlen |
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#undef __underlying_strncat |
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#undef __underlying_strncpy |
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#endif /* _LINUX_FORTIFY_STRING_H_ */
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