forked from mirrors/linux
string.h: move fortified functions definitions in a dedicated header.
This patch adds fortify-string.h to contain fortified functions definitions. Thus, the code is more separated and compile time is approximately 1% faster for people who do not set CONFIG_FORTIFY_SOURCE. Link: https://lkml.kernel.org/r/20210111092141.22946-1-laniel_francis@privacyrequired.com Link: https://lkml.kernel.org/r/20210111092141.22946-2-laniel_francis@privacyrequired.com Signed-off-by: Francis Laniel <laniel_francis@privacyrequired.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Francis Laniel
Linus Torvalds
parent
0e24465d33
commit
a28a6e860c
2 changed files with 303 additions and 281 deletions
302
include/linux/fortify-string.h
Normal file
302
include/linux/fortify-string.h
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@ -0,0 +1,302 @@
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/* 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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@ -266,287 +266,7 @@ void __read_overflow3(void) __compiletime_error("detected read beyond size of ob
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void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
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#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
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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)
|
||||
fortify_panic(__func__);
|
||||
__underlying_memcpy(p, q, len);
|
||||
p[len] = '\0';
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* defined after fortified strnlen to reuse it */
|
||||
extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(strscpy);
|
||||
__FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size)
|
||||
{
|
||||
size_t len;
|
||||
/* Use string size rather than possible enclosing struct size. */
|
||||
size_t p_size = __builtin_object_size(p, 1);
|
||||
size_t q_size = __builtin_object_size(q, 1);
|
||||
|
||||
/* If we cannot get size of p and q default to call strscpy. */
|
||||
if (p_size == (size_t) -1 && q_size == (size_t) -1)
|
||||
return __real_strscpy(p, q, size);
|
||||
|
||||
/*
|
||||
* If size can be known at compile time and is greater than
|
||||
* p_size, generate a compile time write overflow error.
|
||||
*/
|
||||
if (__builtin_constant_p(size) && size > p_size)
|
||||
__write_overflow();
|
||||
|
||||
/*
|
||||
* This call protects from read overflow, because len will default to q
|
||||
* length if it smaller than size.
|
||||
*/
|
||||
len = strnlen(q, size);
|
||||
/*
|
||||
* If len equals size, we will copy only size bytes which leads to
|
||||
* -E2BIG being returned.
|
||||
* Otherwise we will copy len + 1 because of the final '\O'.
|
||||
*/
|
||||
len = len == size ? size : len + 1;
|
||||
|
||||
/*
|
||||
* Generate a runtime write overflow error if len is greater than
|
||||
* p_size.
|
||||
*/
|
||||
if (len > p_size)
|
||||
fortify_panic(__func__);
|
||||
|
||||
/*
|
||||
* We can now safely call vanilla strscpy because we are protected from:
|
||||
* 1. Read overflow thanks to call to strnlen().
|
||||
* 2. Write overflow thanks to above ifs.
|
||||
*/
|
||||
return __real_strscpy(p, q, len);
|
||||
}
|
||||
|
||||
/* defined after fortified strlen and strnlen to reuse them */
|
||||
__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
|
||||
{
|
||||
size_t p_len, copy_len;
|
||||
size_t p_size = __builtin_object_size(p, 1);
|
||||
size_t q_size = __builtin_object_size(q, 1);
|
||||
if (p_size == (size_t)-1 && q_size == (size_t)-1)
|
||||
return __underlying_strncat(p, q, count);
|
||||
p_len = strlen(p);
|
||||
copy_len = strnlen(q, count);
|
||||
if (p_size < p_len + copy_len + 1)
|
||||
fortify_panic(__func__);
|
||||
__underlying_memcpy(p + p_len, q, copy_len);
|
||||
p[p_len + copy_len] = '\0';
|
||||
return p;
|
||||
}
|
||||
|
||||
__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
if (__builtin_constant_p(size) && p_size < size)
|
||||
__write_overflow();
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __underlying_memset(p, c, size);
|
||||
}
|
||||
|
||||
__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
size_t q_size = __builtin_object_size(q, 0);
|
||||
if (__builtin_constant_p(size)) {
|
||||
if (p_size < size)
|
||||
__write_overflow();
|
||||
if (q_size < size)
|
||||
__read_overflow2();
|
||||
}
|
||||
if (p_size < size || q_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __underlying_memcpy(p, q, size);
|
||||
}
|
||||
|
||||
__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
size_t q_size = __builtin_object_size(q, 0);
|
||||
if (__builtin_constant_p(size)) {
|
||||
if (p_size < size)
|
||||
__write_overflow();
|
||||
if (q_size < size)
|
||||
__read_overflow2();
|
||||
}
|
||||
if (p_size < size || q_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __underlying_memmove(p, q, size);
|
||||
}
|
||||
|
||||
extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
|
||||
__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
if (__builtin_constant_p(size) && p_size < size)
|
||||
__read_overflow();
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __real_memscan(p, c, size);
|
||||
}
|
||||
|
||||
__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
size_t q_size = __builtin_object_size(q, 0);
|
||||
if (__builtin_constant_p(size)) {
|
||||
if (p_size < size)
|
||||
__read_overflow();
|
||||
if (q_size < size)
|
||||
__read_overflow2();
|
||||
}
|
||||
if (p_size < size || q_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __underlying_memcmp(p, q, size);
|
||||
}
|
||||
|
||||
__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
if (__builtin_constant_p(size) && p_size < size)
|
||||
__read_overflow();
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __underlying_memchr(p, c, size);
|
||||
}
|
||||
|
||||
void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
|
||||
__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
if (__builtin_constant_p(size) && p_size < size)
|
||||
__read_overflow();
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __real_memchr_inv(p, c, size);
|
||||
}
|
||||
|
||||
extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
|
||||
__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 0);
|
||||
if (__builtin_constant_p(size) && p_size < size)
|
||||
__read_overflow();
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
return __real_kmemdup(p, size, gfp);
|
||||
}
|
||||
|
||||
/* defined after fortified strlen and memcpy to reuse them */
|
||||
__FORTIFY_INLINE char *strcpy(char *p, const char *q)
|
||||
{
|
||||
size_t p_size = __builtin_object_size(p, 1);
|
||||
size_t q_size = __builtin_object_size(q, 1);
|
||||
size_t size;
|
||||
if (p_size == (size_t)-1 && q_size == (size_t)-1)
|
||||
return __underlying_strcpy(p, q);
|
||||
size = strlen(q) + 1;
|
||||
/* test here to use the more stringent object size */
|
||||
if (p_size < size)
|
||||
fortify_panic(__func__);
|
||||
memcpy(p, q, size);
|
||||
return p;
|
||||
}
|
||||
|
||||
/* Don't use these outside the FORITFY_SOURCE implementation */
|
||||
#undef __underlying_memchr
|
||||
#undef __underlying_memcmp
|
||||
#undef __underlying_memcpy
|
||||
#undef __underlying_memmove
|
||||
#undef __underlying_memset
|
||||
#undef __underlying_strcat
|
||||
#undef __underlying_strcpy
|
||||
#undef __underlying_strlen
|
||||
#undef __underlying_strncat
|
||||
#undef __underlying_strncpy
|
||||
#include <linux/fortify-string.h>
|
||||
#endif
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in a new issue