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hardened_malloc
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added check for if small allocations are free

pull/116/head
rwarr627 2020-06-17 19:00:32 -07:00 committed by Daniel Micay
parent 7804e263e9
commit f214bd541a
1 changed files with 11 additions and 0 deletions
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11
h_malloc.c
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@ -1650,6 +1650,17 @@ EXPORT size_t h_malloc_object_size(void *p) {
size_t slab_size = get_slab_size(size_class_slots[class], size_class);
void *slab = get_slab(c, slab_size, metadata);
size_t slot = libdivide_u32_do((const char *)p - (const char *)slab, &c->size_divisor);
if (!get_slot(metadata, slot)) {
fatal_error("invalid malloc_object_size");
}
#if SLAB_QUARANTINE
if (get_quarantine(metadata, slot)) {
fatal_error("invalid malloc_object_size (quarantine)");
}
#endif
void *start = slot_pointer(size_class, slab, slot);
size_t offset = (const char *)p - (const char *)start;