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lighttpd 1.4.41

    1: #include "first.h"
    2: 
    3: #include "settings.h"
    4: 
    5: #include "safe_memclear.h"
    6: 
    7: #include <string.h>
    8: 
    9: #if !defined(HAVE_MEMSET_S) && !defined(HAVE_EXPLICIT_BZERO)
   10: 
   11: #  if defined(HAVE_WEAK_SYMBOLS)
   12: /* it seems weak functions are never inlined, even for static builds */
   13: __attribute__((weak)) void __li_safe_memset_hook(void *buf, size_t len);
   14: 
   15: void __li_safe_memset_hook(void *buf, size_t len)
   16: {
   17: 	UNUSED(buf);
   18: 	UNUSED(len);
   19: }
   20: #  endif /* HAVE_WEAK_SYMBOLS */
   21: 
   22: static void* safe_memset(void *s, int c, size_t n)
   23: {
   24: 	if (n > 0) {
   25: 		volatile unsigned volatile_zero = 0;
   26: 		volatile unsigned char *vs = (volatile unsigned char*)s;
   27: 
   28: 		do {
   29: 			memset(s, c, n);
   30: 		} while (vs[volatile_zero] != (unsigned char)c);
   31: #  if defined(HAVE_WEAK_SYMBOLS)
   32: 		__li_safe_memset_hook(s, n);
   33: #  endif /* HAVE_WEAK_SYMBOLS */
   34: 	}
   35: 
   36: 	return s;
   37: }
   38: #endif /* !defined(HAVE_MEMSET_S) && !defined(HAVE_EXPLICIT_BZERO) */
   39: 
   40: 
   41: void safe_memclear(void *s, size_t n) {
   42: #if defined(HAVE_MEMSET_S)
   43: 	memset_s(s, n, 0, n);
   44: #elif defined(HAVE_EXPLICIT_BZERO)
   45: 	explicit_bzero(s, n);
   46: #else
   47: 	safe_memset(s, 0, n);
   48: #endif
   49: }