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improve encoding of padding canary and buffer overflow detection

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daan 2020-02-01 12:15:12 -08:00
parent 40f1e1e07b
commit aa68b8cbc7
6 changed files with 78 additions and 66 deletions
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12
src/init.c
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@ -173,9 +173,9 @@ static bool _mi_heap_init(void) {
memcpy(heap, &_mi_heap_empty, sizeof(*heap));
heap->thread_id = _mi_thread_id();
_mi_random_init(&heap->random);
heap->cookie = _mi_heap_random_next(heap) | 1;
heap->key[0] = _mi_heap_random_next(heap);
heap->key[1] = _mi_heap_random_next(heap);
heap->cookie = _mi_heap_random_next(heap) | 1;
heap->keys[0] = _mi_heap_random_next(heap);
heap->keys[1] = _mi_heap_random_next(heap);
heap->tld = tld;
tld->heap_backing = heap;
tld->segments.stats = &tld->stats;
@ -418,9 +418,9 @@ void mi_process_init(void) mi_attr_noexcept {
_mi_verbose_message("process init: 0x%zx\n", _mi_heap_main.thread_id);
_mi_random_init(&_mi_heap_main.random);
#ifndef __APPLE__ // TODO: fix this? cannot update cookie if allocation already happened..
_mi_heap_main.cookie = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.key[0] = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.key[1] = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.cookie = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.keys[0] = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.keys[1] = _mi_heap_random_next(&_mi_heap_main);
#endif
mi_process_setup_auto_thread_done();
_mi_os_init();