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add workaround for bug in Linux MPK implementation

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Daniel Micay 2018-10-23 19:07:41 -04:00
parent 299bd6d414
commit 4cd61e281d
1 changed files with 8 additions and 0 deletions
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8
malloc.c
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@ -776,6 +776,14 @@ static void full_unlock(void) {
static void post_fork_child(void) { static void post_fork_child(void) {
thread_unseal_metadata(); thread_unseal_metadata();
#ifdef USE_PKEY
// disable sealing to work around kernel bug causing fork to lose the pkey setup
memory_protect_rw(&ro, sizeof(ro));
ro.metadata_pkey = -1;
memory_protect_ro(&ro, sizeof(ro));
#endif
mutex_init(&ro.region_allocator->lock); mutex_init(&ro.region_allocator->lock);
random_state_init(&ro.region_allocator->rng); random_state_init(&ro.region_allocator->rng);
for (unsigned class = 0; class < N_SIZE_CLASSES; class++) { for (unsigned class = 0; class < N_SIZE_CLASSES; class++) {