From: Eli Zaretskii <eliz@gnu.org>
To: npostavs@users.sourceforge.net
Cc: 24751@debbugs.gnu.org
Subject: bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size")
Date: Fri, 04 Nov 2016 10:22:08 +0200 [thread overview]
Message-ID: <83h97nlknj.fsf@gnu.org> (raw)
In-Reply-To: <87twc6tl0i.fsf@users.sourceforge.net> (npostavs@users.sourceforge.net)
> From: npostavs@users.sourceforge.net
> Date: Thu, 20 Oct 2016 23:54:05 -0400
>
> So we we might want to fix the re_max_failures setting in main, but it
> doesn't quite make sense to me that GROW_FAIL_STACK relies on
> re_max_failures being a multiple of (sizeof (fail_stack_elt_t)). At the
> definition of TYPICAL_FAILURE_SIZE we have
>
> /* Estimate the size of data pushed by a typical failure stack entry.
> An estimate is all we need, because all we use this for
> is to choose a limit for how big to make the failure stack. */
> /* BEWARE, the value `20' is hard-coded in emacs.c:main(). */
> #define TYPICAL_FAILURE_SIZE 20
>
> Why do we use an "estimate" here? What's wrong with just using
> (re_max_failures * sizeof (fail_stack_elt_t)) as the limit? Or should
> the limit actually be (re_max_failures * TYPICAL_FAILURE_SIZE * sizeof
> (fail_stack_elt_t))?
I think it should be the latter, indeed.
Can you propose a patch along those lines that would remove the
infloop in ENSURE_FAIL_STACK?
Thanks.
next prev parent reply other threads:[~2016-11-04 8:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-21 3:54 bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size") npostavs
2016-11-04 8:22 ` Eli Zaretskii [this message]
2016-11-05 19:34 ` npostavs
2016-11-06 15:45 ` Eli Zaretskii
2016-11-13 5:39 ` npostavs
2016-11-13 16:12 ` Eli Zaretskii
2016-11-15 3:08 ` npostavs
2016-11-15 16:12 ` Eli Zaretskii
2016-11-16 1:06 ` npostavs
2016-11-16 16:25 ` Eli Zaretskii
2016-11-16 23:25 ` npostavs
2016-11-17 16:21 ` Eli Zaretskii
2016-11-19 10:02 ` Eli Zaretskii
2017-01-01 18:33 ` npostavs
2017-01-01 18:41 ` Eli Zaretskii
2017-01-01 18:57 ` npostavs
2017-01-01 20:06 ` Eli Zaretskii
2017-01-02 4:49 ` npostavs
2017-01-02 15:24 ` Eli Zaretskii
2017-01-02 18:30 ` npostavs
2017-01-02 19:22 ` Eli Zaretskii
2017-01-08 23:49 ` npostavs
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