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py/gc: Access the list of root pointers in an asan-compatible way. 

Signed-off-by: Jeff Epler <jepler@gmail.com>
This commit is contained in:
Jeff Epler 2021-05-10 16:16:50 -05:00 committed by Damien George
parent f2dbc91022
commit 9a74546f8d
1 changed files with 11 additions and 1 deletions
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12
py/gc.c
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@ -342,9 +342,19 @@ void gc_collect_start(void) {
#endif
}
// Address sanitizer needs to know that the access to ptrs[i] must always be
// considered OK, even if it's a load from an address that would normally be
// prohibited (due to being undefined, in a red zone, etc).
#ifdef __GNUC__
__attribute__((no_sanitize_address))
#endif
static void *gc_get_ptr(void **ptrs, int i) {
return ptrs[i];
}
void gc_collect_root(void **ptrs, size_t len) {
for (size_t i = 0; i < len; i++) {
void *ptr = ptrs[i];
void *ptr = gc_get_ptr(ptrs, i);
if (VERIFY_PTR(ptr)) {
size_t block = BLOCK_FROM_PTR(ptr);
if (ATB_GET_KIND(block) == AT_HEAD) {