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hardened_malloc
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no need for a dedicated init rng

pull/50/head
Daniel Micay 2018-09-06 16:02:15 -04:00
parent 8624201f06
commit 0d3c2e1988
1 changed files with 2 additions and 5 deletions
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7
malloc.c
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@ -614,9 +614,7 @@ COLD static void init_slow_path(void) {
fatal_error("page size mismatch");
}
struct random_state rng;
random_state_init(&rng);
random_state_init(&regions_rng);
for (unsigned i = 0; i < 2; i++) {
ro.regions[i] = allocate_pages(max_region_table_size, PAGE_SIZE, false);
if (ro.regions[i] == NULL) {
@ -627,7 +625,6 @@ COLD static void init_slow_path(void) {
if (memory_protect_rw(regions, regions_total * sizeof(struct region_info))) {
fatal_error("failed to unprotect memory for regions table");
}
random_state_init(&regions_rng);
ro.slab_region_start = memory_map(slab_region_size);
if (ro.slab_region_start == NULL) {
@ -645,7 +642,7 @@ COLD static void init_slow_path(void) {
random_state_init(&c->rng);
size_t bound = (real_class_region_size - class_region_size) / PAGE_SIZE - 1;
size_t gap = (get_random_u64_uniform(&rng, bound) + 1) * PAGE_SIZE;
size_t gap = (get_random_u64_uniform(&regions_rng, bound) + 1) * PAGE_SIZE;
c->class_region_start = (char *)ro.slab_region_start + real_class_region_size * class + gap;
size_t size = size_classes[class];