* Re: C stack overflow in emacs (19.33) regexp code
1996-08-24 4:36 C stack overflow in emacs (19.33) regexp code Ken Raeburn
@ 1996-08-24 4:20 ` Richard Stallman
0 siblings, 0 replies; 2+ messages in thread
From: Richard Stallman @ 1996-08-24 4:20 UTC (permalink / raw)
My guess is that the space used by the regexp code is related to the
search buffer size, or the contents.
That is true with complex regexps. It isn't feasible for me to change
that.
^ permalink raw reply [flat|nested] 2+ messages in thread
* C stack overflow in emacs (19.33) regexp code
@ 1996-08-24 4:36 Ken Raeburn
1996-08-24 4:20 ` Richard Stallman
0 siblings, 1 reply; 2+ messages in thread
From: Ken Raeburn @ 1996-08-24 4:36 UTC (permalink / raw)
Cc: ding
(Sorry if this has been reported. This bug is making it difficult for
me to read news and mail, so I haven't checked to see.)
I've seen this problem in both i386-netbsd and alpha-osf3.2
configurations. I'm using emacs 19.33. I don't have the original
spam message that caused the problem for me on the x86 (four or five
times, as multiple copies came in), but the big elisp form below,
based on another message I just received, crashes emacs on my alpha.
(If it doesn't crash it for you, try expanding the "to" field by a
factor of 5 or 10, and/or reducing your stack size limit.) Don't
evaluate it if you haven't saved your buffers first...
In Red Gnus 0.11, header lines in an incoming mail message are joined
at the continuation breaks, and various regular expressions applied to
the result. You get *really* long lines when some obnoxious
brain-dead *@%$!# sends mail with a 150-line "to" header.
My guess is that the space used by the regexp code is related to the
search buffer size, or the contents. (I don't know why. I would've
expected it to be derived entirely from size of the DFA needed to
recognize the input pattern. But it's been years since my algorithms
course and I don't remember the regexp stuff well.) And it's on the
stack. On both of the systems I've been using, this crashes emacs.
I'm using default stack size limits on each system.
Emacs does fine with smaller buffers and the same set of patterns.
I took a look at regex.c. I don't grok the regexp aspect yet, and
haven't tried much, but it appears to me that DOUBLE_FAIL_STACK could
be more clever about trying to reuse the already-allocated stack
space. It would only save a factor of 2 or 1.5 or something like
that, and only on the systems where that sort of thing can work. I
don't think it's an adequate solution for this problem, just a space
optimization.
Some approaches I can think of:
* find a way to improve the space requirements of the RE algorithm
(offers greatest potential reward, but probably hardest)
* use malloc and realloc always, by defining REGEX_MALLOC (maybe it
would fail more cleanly?)
* change gnus header scanning to avoid this bug (but I'm not sure
how; maybe searching for field names and values separately would
help? I'm skeptical, but can't rule it out since I don't know
precisely why so much memory is needed)
* do "unlimit stacksize" within emacs (not a big help if space
requirements are linear or worse)
* write a "realloca" to use less stack space (ditto)
* kill people who send spam, or at least hurt them badly (gratifying,
perhaps, but not legal, and would only happen after the mail has
been sent anyways)
Ken
(progn
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Date: Fri, 23 Aug 1996 22:13:33 -0500
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From: Jeffrey Tay Swee Kim <pop.cyberway.com.sg@cyberway.com.sg>
Subject: Free Software
Blah blah blah, same old spam crap every moron posts who thinks the
Internet is his personal advertising service.")
(set-buffer (get-buffer-create "spam-crap"))
(erase-buffer)
(insert crap)
(goto-char (point-min))
(while (re-search-forward "\n[ \t]+" nil t)
(replace-match " " nil nil))
(goto-char (point-max))
; Say good night, Gracie.
(re-search-backward "^\\(to\\|cc\\|apparently-to\\):.*\\<\\(.*rdist.*@.*usc.edu\\)\\>"
nil t nil)
)
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~1996-08-24 4:36 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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1996-08-24 4:36 C stack overflow in emacs (19.33) regexp code Ken Raeburn
1996-08-24 4:20 ` Richard Stallman
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