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support zero-initialized memory detection

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This commit is contained in:
daan 2019-09-02 13:16:52 -07:00
parent 216d75a222
commit d1bd1644d5
9 changed files with 123 additions and 48 deletions
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15
src/page.c
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@ -81,6 +81,14 @@ static bool mi_page_is_valid_init(mi_page_t* page) {
mi_assert_internal(mi_page_list_is_valid(page,page->free));
mi_assert_internal(mi_page_list_is_valid(page,page->local_free));
if (page->flags.is_zero) {
for(mi_block_t* block = page->free; block != NULL; mi_block_next(page,block)) {
for (size_t i = sizeof(mi_block_t); i < page->block_size; i++) {
mi_assert_internal(0 == *((uint8_t*)block + i));
}
}
}
mi_block_t* tfree = mi_tf_block(page->thread_free);
mi_assert_internal(mi_page_list_is_valid(page, tfree));
size_t tfree_count = mi_page_list_count(page, tfree);
@ -184,6 +192,7 @@ void _mi_page_free_collect(mi_page_t* page, bool force) {
// usual case
page->free = page->local_free;
page->local_free = NULL;
page->flags.is_zero = false;
}
else if (force) {
// append -- only on shutdown (force) as this is a linear operation
@ -195,7 +204,8 @@ void _mi_page_free_collect(mi_page_t* page, bool force) {
mi_block_set_next(page, tail, page->free);
page->free = page->local_free;
page->local_free = NULL;
}
page->flags.is_zero = false;
}
}
mi_assert_internal(!force || page->local_free == NULL);
@ -547,6 +557,8 @@ static void mi_page_extend_free(mi_heap_t* heap, mi_page_t* page, mi_stats_t* st
page->capacity += (uint16_t)extend;
_mi_stat_increase(&stats->page_committed, extend * page->block_size);
// extension into zero initialized memory preserves the zero'd free list
if (!page->is_zero_init) page->flags.is_zero = false;
mi_assert_expensive(mi_page_is_valid_init(page));
}
@ -565,6 +577,7 @@ static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t block_size, mi
#if MI_SECURE
page->cookie = _mi_heap_random(heap) | 1;
#endif
page->flags.is_zero = page->is_zero_init;
mi_assert_internal(page->capacity == 0);
mi_assert_internal(page->free == NULL);