summaryrefslogtreecommitdiff
path: root/malloc
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>1998-11-04 12:06:57 +0000
committerUlrich Drepper <drepper@redhat.com>1998-11-04 12:06:57 +0000
commit3ddfec55c4843ce1d8c339e347970591a9037658 (patch)
tree7fdfba2cba1412377f44dddb0af434410a5c48e3 /malloc
parentf540c0a4adc26817274b34b1cca16a4969196cc1 (diff)
downloadglibc-3ddfec55c4843ce1d8c339e347970591a9037658.tar.gz
Update.
1998-11-04 Ulrich Drepper <drepper@cygnus.com> * malloc/malloc.c: Make sure calloc really returned zeroed memory. Patch by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.
Diffstat (limited to 'malloc')
-rw-r--r--malloc/malloc.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index ba32992999..2cf2025237 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1772,15 +1772,15 @@ __malloc_check_init()
static int dev_zero_fd = -1; /* Cached file descriptor for /dev/zero. */
-#define MMAP(size, prot, flags) ((dev_zero_fd < 0) ? \
+#define MMAP(addr, size, prot, flags) ((dev_zero_fd < 0) ? \
(dev_zero_fd = open("/dev/zero", O_RDWR), \
- mmap(0, (size), (prot), (flags), dev_zero_fd, 0)) : \
- mmap(0, (size), (prot), (flags), dev_zero_fd, 0))
+ mmap((addr), (size), (prot), (flags), dev_zero_fd, 0)) : \
+ mmap((addr), (size), (prot), (flags), dev_zero_fd, 0))
#else
-#define MMAP(size, prot, flags) \
- (mmap(0, (size), (prot), (flags)|MAP_ANONYMOUS, -1, 0))
+#define MMAP(addr, size, prot, flags) \
+ (mmap((addr), (size), (prot), (flags)|MAP_ANONYMOUS, -1, 0))
#endif
@@ -1806,7 +1806,7 @@ mmap_chunk(size) size_t size;
*/
size = (size + SIZE_SZ + page_mask) & ~page_mask;
- p = (mchunkptr)MMAP(size, PROT_READ|PROT_WRITE, MAP_PRIVATE);
+ p = (mchunkptr)MMAP(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE);
if(p == (mchunkptr) MAP_FAILED) return 0;
n_mmaps++;
@@ -1939,7 +1939,7 @@ new_heap(size) size_t size;
No swap space needs to be reserved for the following large
mapping (on Linux, this is the case for all non-writable mappings
anyway). */
- p1 = (char *)MMAP(HEAP_MAX_SIZE<<1, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE);
+ p1 = (char *)MMAP(0, HEAP_MAX_SIZE<<1, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE);
if(p1 == MAP_FAILED)
return 0;
p2 = (char *)(((unsigned long)p1 + HEAP_MAX_SIZE) & ~(HEAP_MAX_SIZE-1));
@@ -1980,7 +1980,10 @@ grow_heap(h, diff) heap_info *h; long diff;
new_size = (long)h->size + diff;
if(new_size < (long)sizeof(*h))
return -1;
- if(mprotect((char *)h + new_size, -diff, PROT_NONE) != 0)
+ /* Try to re-map the extra heap space freshly to save memory, and
+ make it inaccessible. */
+ if((char *)MMAP((char *)h + new_size, -diff, PROT_NONE,
+ MAP_PRIVATE|MAP_FIXED) == (char *) MAP_FAILED)
return -2;
}
h->size = new_size;
@@ -2136,7 +2139,10 @@ static void do_check_chunk(ar_ptr, p) arena *ar_ptr; mchunkptr p;
if(ar_ptr != &main_arena) {
heap_info *heap = heap_for_ptr(p);
assert(heap->ar_ptr == ar_ptr);
- assert((char *)p + sz <= (char *)heap + heap->size);
+ if(p != top(ar_ptr))
+ assert((char *)p + sz <= (char *)heap + heap->size);
+ else
+ assert((char *)p + sz == (char *)heap + heap->size);
return;
}
#endif