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signal.c: last tag page condition

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* signal.c (check_stack_overflow): drop the last tag when it is
  close to the fault page, not same as sp page.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-04-15 02:37:21 +00:00
parent 0472578b26
commit 5e635a3678
1 changed files with 1 additions and 1 deletions
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2
signal.c
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@ -843,7 +843,7 @@ check_stack_overflow(int sig, const uintptr_t addr, const ucontext_t *ctx)
if (sp_page == fault_page || sp_page == fault_page + 1 ||
sp_page <= fault_page && fault_page <= bp_page) {
rb_thread_t *th = ruby_current_thread;
if ((uintptr_t)th->tag->buf / pagesize == sp_page) {
if ((uintptr_t)th->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. */