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(main): Update re_max_failures so regex.c won't overflow

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the stack, except when dumping.
This commit is contained in:
Richard M. Stallman 1997-08-15 05:07:01 +00:00
parent 74700529a8
commit 6c2935e99f
1 changed files with 15 additions and 4 deletions
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19
src/emacs.c
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@ -579,12 +579,19 @@ main (argc, argv, envp)
#endif /* VMS */
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK)
/* Extend the stack space available. */
if (!getrlimit (RLIMIT_STACK, &rlim))
/* Extend the stack space available.
Don't do that if dumping, since some systems (e.g. DJGPP)
might define a smaller stack limit at that time. */
if (1
#ifndef CANNOT_DUMP
&& (!noninteractive || initialized)
#endif
&& !getrlimit (RLIMIT_STACK, &rlim))
{
long newlim;
extern int re_max_failures;
/* Approximate the amount regex.c needs, plus some more. */
newlim = 800000 * sizeof (char *);
newlim = re_max_failures * 2 * 20 * sizeof (char *);
#ifdef __NetBSD__
/* NetBSD (at least NetBSD 1.2G and former) has a bug in its
stack allocation routine for new process that the allocation
@ -593,7 +600,11 @@ main (argc, argv, envp)
newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize();
#endif
if (newlim > rlim.rlim_max)
newlim = rlim.rlim_max;
{
newlim = rlim.rlim_max;
/* Don't let regex.c overflow the stack. */
re_max_failures = newlim / (2 * 20 * sizeof (char *));
}
if (rlim.rlim_cur < newlim)
rlim.rlim_cur = newlim;