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Rewind execution tags more at stack overflow [Bug #18084]

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Nobuyoshi Nakada 2021-08-18 14:09:29 +09:00
parent 58bd943436
commit 574f3af36e
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Notes: git 2021-08-18 18:18:53 +09:00
1 changed files with 3 additions and 2 deletions
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signal.c
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@ -878,12 +878,13 @@ check_stack_overflow(int sig, const uintptr_t addr, const ucontext_t *ctx)
(sp_page <= fault_page && fault_page <= bp_page)) {
rb_execution_context_t *ec = GET_EC();
int crit = FALSE;
if ((uintptr_t)ec->tag->buf / pagesize <= fault_page + 1) {
int uplevel = roomof(pagesize, sizeof(*ec->tag)) / 2; /* XXX: heuristic */
while ((uintptr_t)ec->tag->buf / pagesize <= fault_page + 1) {
/* drop the last tag if it is close to the fault,
* otherwise it can cause stack overflow again at the same
* place. */
if ((crit = (!ec->tag->prev || !--uplevel)) != FALSE) break;
ec->tag = ec->tag->prev;
crit = TRUE;
}
reset_sigmask(sig);
rb_ec_stack_overflow(ec, crit);