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use volatile pointers for intentional-crash code.

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This commit is contained in:
Rich Felker 2011-06-06 18:10:43 -04:00
parent da88b16a22
commit 71a80c5767
2 changed files with 3 additions and 3 deletions
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4
src/malloc/malloc.c
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@ -395,7 +395,7 @@ void *realloc(void *p, size_t n)
size_t oldlen = n0 + extra; size_t oldlen = n0 + extra;
size_t newlen = n + extra; size_t newlen = n + extra;
/* Crash on realloc of freed chunk */ /* Crash on realloc of freed chunk */
if ((uintptr_t)base < mal.brk) *(char *)0=0; if ((uintptr_t)base < mal.brk) *(volatile char *)0=0;
if (newlen < PAGE_SIZE && (new = malloc(n))) { if (newlen < PAGE_SIZE && (new = malloc(n))) {
memcpy(new, p, n-OVERHEAD); memcpy(new, p, n-OVERHEAD);
free(p); free(p);
@ -458,7 +458,7 @@ void free(void *p)
char *base = (char *)self - extra; char *base = (char *)self - extra;
size_t len = CHUNK_SIZE(self) + extra; size_t len = CHUNK_SIZE(self) + extra;
/* Crash on double free */ /* Crash on double free */
if ((uintptr_t)base < mal.brk) *(char *)0=0; if ((uintptr_t)base < mal.brk) *(volatile char *)0=0;
__munmap(base, len); __munmap(base, len);
return; return;
} }

2
src/time/__asctime.c
View File

@ -21,7 +21,7 @@ char *__asctime(const struct tm *tm, char *buf)
* application developers that they may not be so lucky * application developers that they may not be so lucky
* on other implementations (e.g. stack smashing..). * on other implementations (e.g. stack smashing..).
*/ */
*(int*)0 = 0; *(volatile int*)0 = 0;
} }
return buf; return buf;
} }