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* Use mmap() instead of malloc() in the mmap() reimplementation so that

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returned values are not in the heap.
This commit is contained in:
Sam Hocevar 2007-02-19 10:28:16 +00:00 committed by sam
parent 672817517e
commit 87e48899ba
1 changed files with 15 additions and 5 deletions
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20
src/lib-mem.c
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@ -217,13 +217,23 @@ int nbmaps = 0;
#define MMAP(fn, off_t) \
do { \
char *b = MAP_FAILED; \
LOADSYM(fn); \
ret = ORIG(fn)(start, length, prot, flags, fd, offset); \
if(!_zz_ready || !_zz_iswatched(fd) || _zz_islocked(fd)) \
return ret; \
if(ret && length) \
return ORIG(fn)(start, length, prot, flags, fd, offset); \
ret = ORIG(fn)(NULL, length, prot, flags, fd, offset); \
if(ret != MAP_FAILED && length) \
{ \
b = ORIG(fn)(start, length, PROT_READ | PROT_WRITE, \
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
if(b == MAP_FAILED) \
{ \
munmap(ret, length); \
ret = MAP_FAILED; \
} \
} \
if(b != MAP_FAILED) \
{ \
char *b = malloc(length); \
int i, oldpos; \
for(i = 0; i < nbmaps; i += 2) \
if(maps[i] == NULL) \
@ -283,7 +293,7 @@ int NEW(munmap)(void *start, size_t length)
if(maps[i] != start)
continue;
free(start);
ORIG(munmap)(start, length);
ret = ORIG(munmap)(maps[i + 1], length);
maps[i] = NULL;
maps[i + 1] = NULL;