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bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Va
From: |
Eli Zaretskii |
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 |
> 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.
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"),
Eli Zaretskii <=
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), npostavs, 2016/11/05
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), Eli Zaretskii, 2016/11/06
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), npostavs, 2016/11/13
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), Eli Zaretskii, 2016/11/13
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), npostavs, 2016/11/14
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), Eli Zaretskii, 2016/11/15
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), npostavs, 2016/11/15
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), Eli Zaretskii, 2016/11/16
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), npostavs, 2016/11/16
- bug#24751: 26.0.50; Regex stack overflow not detected properly (gets "Variable binding depth exceeds max-specpdl-size"), Eli Zaretskii, 2016/11/17