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Support gcc FORTIFY_SOURCE features for nuttx libc

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This function will use gcc's function
__builtin_dynamic_object_size and __builtin_object_size

Its function is to obtain the size of the object through compilation,
so as to judge whether there are out-of-bounds operations in commonly used functions.
It should be noted that the option -O2 and above is required to enable this function

Signed-off-by: anjiahao <1090959677@qq.com>
This commit is contained in:
anjiahao
2023-06-22 20:38:45 +08:00
committed by Xiang Xiao
parent 880d78f903
commit d5981375a6
10 changed files with 483 additions and 0 deletions
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include/string.h
+101
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@@ -108,6 +108,107 @@ FAR void *memmem(FAR const void *haystack, size_t haystacklen,
void explicit_bzero(FAR void *s, size_t n);
int timingsafe_bcmp(FAR const void *b1, FAR const void *b2, size_t n);
#if CONFIG_FORTIFY_SOURCE > 0
fortify_function(strcat) FAR char *strcat(FAR char *dest,
FAR const char *src)
{
fortify_assert(strlen(dest) + strlen(src) + 1 <= fortify_size(dest, 0));
return __real_strcat(dest, src);
}
fortify_function(strlcat) size_t strlcat(FAR char *dst,
FAR const char *src,
size_t dsize)
{
fortify_assert(dsize <= fortify_size(dst, 0));
return __real_strlcat(dst, src, dsize);
}
fortify_function(strncat) FAR char *strncat(FAR char *dest,
FAR const char *src,
size_t n)
{
fortify_assert(n <= fortify_size(dest, 0));
return __real_strncat(dest, src, n);
}
fortify_function(strcpy) FAR char *strcpy(FAR char *dest,
FAR const char *src)
{
fortify_assert(strlen(src) + 1 <= fortify_size(dest, 0));
return __real_strcpy(dest, src);
}
fortify_function(stpcpy) FAR char *stpcpy(FAR char *dest,
FAR const char *src)
{
fortify_assert(strlen(src) + 1 <= fortify_size(dest, 0));
return __real_stpcpy(dest, src);
}
fortify_function(stpncpy) FAR char *stpncpy(FAR char *dest,
FAR const char *src,
size_t n)
{
fortify_assert(n <= fortify_size(dest, 0));
return __real_stpncpy(dest, src, n);
}
fortify_function(strlcpy) size_t strlcpy(FAR char *dst,
FAR const char *src,
size_t siz)
{
fortify_assert(siz <= fortify_size(dst, 0));
return __real_strlcpy(dst, src, siz);
}
fortify_function(strncpy) FAR char *strncpy(FAR char *dest,
FAR const char *src,
size_t n)
{
fortify_assert(n <= fortify_size(dest, 0));
return __real_strncpy(dest, src, n);
}
fortify_function(memmove) FAR void *memmove(FAR void *dest,
FAR const void *src,
size_t count)
{
fortify_assert(count <= fortify_size(dest, 0) &&
count <= fortify_size(src, 0));
return __real_memmove(dest, src, count);
}
fortify_function(memcpy) FAR void *memcpy(FAR void *dest,
FAR const void *src,
size_t n)
{
fortify_assert(n <= fortify_size(dest, 0) && n <= fortify_size(src, 0));
return __real_memcpy(dest, src, n);
}
fortify_function(memset) FAR void *memset(FAR void *s, int c, size_t n)
{
fortify_assert(n <= fortify_size(s, 0));
return __real_memset(s, c, n);
}
fortify_function(mempcpy) FAR void *mempcpy(FAR void *dest,
FAR const void *src,
size_t n)
{
fortify_assert(n <= fortify_size(dest, 0) && n <= fortify_size(src, 0));
return __real_mempcpy(dest, src, n);
}
fortify_function(explicit_bzero) void explicit_bzero(FAR void *s,
size_t n)
{
fortify_assert(n <= fortify_size(s, 0));
__real_explicit_bzero(s, n);
}
#endif
#undef EXTERN
#if defined(__cplusplus)
}