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Add fwrite() check

This commit is contained in:
sin 2015-03-01 13:17:21 +00:00
parent 0c985218e9
commit 15c2b9d8df
1 changed files with 15 additions and 0 deletions
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15
include/stdio.h
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@ -29,6 +29,19 @@ __fortify_fread(void *dst, size_t n, size_t nmemb, FILE *fp)
return fread(dst, n, nmemb, fp);
}
static inline __attribute__ ((always_inline))
size_t
__fortify_fwrite(const void *dst, size_t n, size_t nmemb, FILE *fp)
{
size_t bos = __builtin_object_size(dst, 0);
if (n != 0 && (n * nmemb) / n != nmemb)
__builtin_trap();
if (n * nmemb > bos)
__builtin_trap();
return fwrite(dst, n, nmemb, fp);
}
static inline
__attribute__ ((always_inline))
__attribute__ ((__format__ (printf, 2, 0)))
@ -67,6 +80,8 @@ __fortify_vsnprintf(char *s, size_t n, const char *fmt, __builtin_va_list ap)
#define fgets(s, n, fp) __fortify_fgets(s, n, fp)
#undef fread
#define fread(dst, n, nmemb, fp) __fortify_fread(dst, n, nmemb, fp)
#undef fwrite
#define fwrite(dst, n, nmemb, fp) __fortify_fwrite(dst, n, nmemb, fp)
#undef vsprintf
#define vsprintf(s, fmt, ap) __fortify_vsprintf(s, fmt, ap)
#undef vsnprintf