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hardened_malloc
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support disabling region quarantine

pull/121/head
Daniel Micay 2020-09-17 16:51:16 -04:00
parent 85c5c3736c
commit a88305c01b
1 changed files with 20 additions and 9 deletions
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29
h_malloc.c
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@ -30,6 +30,7 @@
#include "util.h"
#define SLAB_QUARANTINE (SLAB_QUARANTINE_RANDOM_LENGTH > 0 || SLAB_QUARANTINE_QUEUE_LENGTH > 0)
#define REGION_QUARANTINE (REGION_QUARANTINE_RANDOM_LENGTH > 0 || REGION_QUARANTINE_QUEUE_LENGTH > 0)
#define MREMAP_MOVE_THRESHOLD (32 * 1024 * 1024)
static_assert(sizeof(void *) == 8, "64-bit only");
@ -793,9 +794,13 @@ struct region_allocator {
#if CONFIG_STATS
size_t allocated;
#endif
#if REGION_QUARANTINE_RANDOM_LENGTH
struct quarantine_info quarantine_random[REGION_QUARANTINE_RANDOM_LENGTH];
#endif
#if REGION_QUARANTINE_QUEUE_LENGTH
struct quarantine_info quarantine_queue[REGION_QUARANTINE_QUEUE_LENGTH];
size_t quarantine_queue_index;
#endif
struct random_state rng;
};
@ -828,7 +833,7 @@ struct __attribute__((aligned(PAGE_SIZE))) allocator_state {
};
static void regions_quarantine_deallocate_pages(void *p, size_t size, size_t guard_size) {
if (size >= REGION_QUARANTINE_SKIP_THRESHOLD) {
if (!REGION_QUARANTINE || size >= REGION_QUARANTINE_SKIP_THRESHOLD) {
deallocate_pages(p, size, guard_size);
return;
}
@ -839,29 +844,35 @@ static void regions_quarantine_deallocate_pages(void *p, size_t size, size_t gua
}
memory_set_name(p, size, "malloc large");
struct quarantine_info a =
struct quarantine_info target =
(struct quarantine_info){(char *)p - guard_size, size + guard_size * 2};
struct region_allocator *ra = ro.region_allocator;
mutex_lock(&ra->lock);
#if REGION_QUARANTINE_RANDOM_LENGTH
size_t index = get_random_u64_uniform(&ra->rng, REGION_QUARANTINE_RANDOM_LENGTH);
struct quarantine_info b = ra->quarantine_random[index];
ra->quarantine_random[index] = a;
if (b.p == NULL) {
struct quarantine_info random_substitute = ra->quarantine_random[index];
ra->quarantine_random[index] = target;
if (random_substitute.p == NULL) {
mutex_unlock(&ra->lock);
return;
}
target = random_substitute;
#endif
a = ra->quarantine_queue[ra->quarantine_queue_index];
ra->quarantine_queue[ra->quarantine_queue_index] = b;
#if REGION_QUARANTINE_QUEUE_LENGTH
struct quarantine_info queue_substitute = ra->quarantine_queue[ra->quarantine_queue_index];
ra->quarantine_queue[ra->quarantine_queue_index] = target;
ra->quarantine_queue_index = (ra->quarantine_queue_index + 1) % REGION_QUARANTINE_QUEUE_LENGTH;
target = queue_substitute;
#endif
mutex_unlock(&ra->lock);
if (a.p != NULL) {
memory_unmap(a.p, a.size);
if (target.p != NULL) {
memory_unmap(target.p, target.size);
}
}