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Add snprintf() checks 

We need to use a variadic macro in this case because GCC doesn't
allow inline functions with variable argument lists.
This commit is contained in:
sin 2015-01-28 17:08:27 +00:00
parent b4a9df1a08
commit 5960e3364f
1 changed files with 9 additions and 3 deletions
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12
include/stdio.h
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@ -13,15 +13,21 @@ int __fortify_vsnprintf(char *__restrict s, size_t n, const char *__restrict fmt
{
size_t bos = __builtin_object_size(s, 0);
if (bos == (size_t)-1)
return vsnprintf(s, n, fmt, ap);
if (__builtin_constant_p(n) && n > bos)
if (n > bos)
__builtin_trap();
return vsnprintf(s, n, fmt, ap);
}
#undef vsnprintf
#define vsnprintf(s, n, fmt, ap) __fortify_vsnprintf(s, n, fmt, ap)
#undef snprintf
#define snprintf(s, n, fmt, ...) ({ \
size_t _n = (n); \
size_t bos = __builtin_object_size(s, 0); \
if (n > bos) \
__builtin_trap(); \
snprintf(s, n, fmt, __VA_ARGS__); \
})
#endif