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Posted to dev@spamassassin.apache.org by bu...@bugzilla.spamassassin.org on 2005/09/06 01:21:25 UTC
[Bug 4570] New: Mail with lots of To addresses in header triggers Bus error in Perl
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
Summary: Mail with lots of To addresses in header triggers Bus
error in Perl
Product: Spamassassin
Version: 3.1.0
Platform: Other
URL: http://ezri.ijs.si/~mark/sa-perl-buserr.txt
OS/Version: FreeBSD
Status: NEW
Severity: normal
Priority: P3
Component: Libraries
AssignedTo: dev@spamassassin.apache.org
ReportedBy: Mark.Martinec@ijs.si
I just came across a similar spam message (URL attached) with
insanely lots of recipients listed in its header (1600+), and it
causes 'spamassassin -t -D' to trigger Perl crash with a Bus error.
This is the same bug as discussed on the SA mailing list these days
(reported by Irina <irina <at> nas.net> on 2005-08-18,
subject: "Too many recipients").
Unlike Irina, I run Perl 5.8.7, SA 3.1.0-rc2, and if it matters, this
is a FreeBSD 5.4 (it may matter because Perl memory limits may be different
than on a Linux system). The system is otherwise stable and is processsing
regular company mail in quantities through this same SA/Perl.
The tail of the output from "truss -f spamassassin -t -D <0.lis" is:
[12661] dbg: plugin:
Mail::SpamAssassin::Plugin::AutoLearnThreshold=HASH(0x9533a60)
implements 'autolearn_discriminator'
12661: write(2,0xa08f804,121) = 121 (0x79)
[12661] dbg: learn: auto-learn: currently using scoreset 3,
recomputing score based on scoreset 1
12661: write(2,0xa08f804,98) = 98 (0x62)
[12661] dbg: learn: auto-learn: message score: 10.0202857142857,
computed score for autolearn: 7.219
12661: write(2,0xa08f804,101) = 101 (0x65)
[12661] dbg: learn: auto-learn? ham=0.1, spam=12, body-points=4.719,
head-points=7.219, learned-points=3.5
12661: write(2,0xa08f804,107) = 107 (0x6b)
[12661] dbg: learn: auto-learn? no: inside auto-learn thresholds,
not considered ham or spam
12661: write(2,0xa08f804,93) = 93 (0x5d)
12661: unlink("/tmp/.spamassassin12661f3JCzttmp") = 0 (0x0)
[12661] dbg: check: is spam? score=10.02 required=6.8
12661: write(2,0xa08f804,54) = 54 (0x36)
[12661] dbg: check:
tests=AWL,BAYES_99,DCC_CHECK,DNS_FROM_RFC_ABUSE,DNS_FROM_RFC_POST,
HEAD_LONG,SPF_HELO_PASS,SPF_PASS,UNPARSEABLE_RELAY
12661: write(2,0xa08f804,137) = 137 (0x89)
[12661] dbg: check:
subtests=__CT,__CTE,__CT_TEXT_PLAIN,__ENV_AND_HDR_FROM_MATCH,
__FROM_MSN_COM,__HAS_MSGID,__HAS_RCVD,__HAS_SUBJECT,__HIGHBITS,
__MIME_QP,__MIME_VERSION,__MSGID_OK_DIGITS,__MSGID_OK_HEX,
__MSGID_OK_HOST,__NONEMPTY_BODY,__RFC_IGNORANT_ENVFROM,__SANE_MSGID,
__SARE_BODY_BLNK_5_100,__SARE_HEAD_HDR_MIMEV,__SARE_HEAD_HDR_RCVD,
__SARE_HEAD_MIME_VALID,__SARE_HTML_HAS_MSG,__SARE_HTML_HAS_TO,
__SARE_META_MURTY3,__SARE_URI_ANY,__TOCC_EXISTS
12661: write(2,0xa08f804,446) = 446 (0x1be)
12661: __sysctl(0xbfbfe878,0x2,0xbfbfe8c0,0xbfbfe894,0x0,0x0) = 0 (0x0)
SIGNAL 10 (SIGBUS)
SIGNAL 10 (SIGBUS)
Process stopped because of: 16
process exit, rval = 10
Bus error
My wild guess is that it happens within some regular expression
evaluation, having to deal with such a long folder header line.
It is probably not a showstopper for 3.1.0, as I believe this has
been seen also in previous versions. But it may get interesting
if bad guys become aware of it.
Mark
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From Mark.Martinec@ijs.si 2005-09-05 17:41 -------
Here are the last dying breaths of when Perl debugger is enabled
on "spamassassin -L -t -D <0.lis" :
370: return $self->{pristine_headers} unless $hdr;
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:371):
371: my(@ret) = $self->{pristine_headers} =~
/^(?:$hdr:[ \t]+(.*\n(?:\s+\S.*\n)*))/mig;
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:372):
372: if (@ret) {
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:373):
373: return wantarray ? @ret : $ret[-1];
Mail::SpamAssassin::PerMsgStatus::rewrite_report_safe(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/PerMsgStatus.pm:719):
719: my $to = $self->{msg}->get_pristine_header("To");
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:368):
368: my ($self, $hdr) = @_;
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:370):
370: return $self->{pristine_headers} unless $hdr;
Mail::SpamAssassin::Message::get_pristine_header(
/usr/local/lib/perl5/site_perl/5.8.7/Mail/SpamAssassin/Message.pm:371):
371: my(@ret) = $self->{pristine_headers} =~
/^(?:$hdr:[ \t]+(.*\n(?:\s+\S.*\n)*))/mig;
Illegal instruction
$
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
spamassassin@dostech.ca changed:
What |Removed |Added
----------------------------------------------------------------------------
Status Whiteboard|3 votes needed |1 vote needed
------- Additional Comments From spamassassin@dostech.ca 2005-11-09 03:56 -------
+1
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
sidney@sidney.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |felicity@apache.org
------- Additional Comments From sidney@sidney.com 2005-09-10 21:39 -------
*** Bug 4171 has been marked as a duplicate of this bug. ***
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
------- Additional Comments From jm@jmason.org 2005-11-01 21:36 -------
Created an attachment (id=3226)
--> (http://issues.apache.org/SpamAssassin/attachment.cgi?id=3226&action=view)
Mark's test case mail
fwiw, here's a copy of Mark's test case mail from the URL he posted, as an
attachment.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
sidney@sidney.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Summary|[REVIEW] Mail with lots of |Mail with lots of To
|To addresses in header |addresses in header triggers
|triggers Bus error in Perl |Bus error in Perl
Status Whiteboard|can be committed |
------- Additional Comments From sidney@sidney.com 2005-09-09 21:37 -------
Committed to branch 3.1 revision 279946
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[Bug 4570] [REVIEW] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
sidney@sidney.com changed:
What |Removed |Added
----------------------------------------------------------------------------
OS/Version|FreeBSD |All
Summary|Mail with lots of To |[REVIEW] Mail with lots of
|addresses in header triggers|To addresses in header
|Bus error in Perl |triggers Bus error in Perl
Status Whiteboard| |needs two votes
------- Additional Comments From sidney@sidney.com 2005-09-08 15:52 -------
Committed to trunk revision 279666.
Ready for voting for 3.1.0 branch.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
wtogami@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |ASSIGNED
Status Whiteboard| |3 votes needed
------- You are receiving this mail because: -------
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
jm@jmason.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Mail with lots of To |Mail with lots of To
|addresses in header triggers|addresses in header triggers
|Bus error in Perl |Bus error in Perl [CVE-2005-
| |3351]
------- Additional Comments From jm@jmason.org 2005-11-01 21:45 -------
thanks for sorting the CVE for us, Mark.
I'm not sure if it's possible to actually use this to cause a practical DoS,
btw. it would be possible to get a message passed as nonspam (through scanner
failure), but the scanner should recover the dead child process immediately for
later scans; spamd is resilient in the face of the Mail::SpamAssassin classes
blowing up.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From sidney@sidney.com 2005-09-08 12:19 -------
That does look a lot better. Not being much of a perl expert I didn't know about
the negated lookahead operator (?! and I was working on splitting the headers
into lines and scanning them in a loop. Can someone see how many lines the
regexp can handle on a FreeBSD system that has the lower limit? If it can handle
something that is long enough that it would be too long for SpamAssassin anyway
(i.e., over 256k bytes or so) then I think we could go with the regexp instead
of the much longer loop code.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
------- Additional Comments From jm@jmason.org 2005-11-08 23:57 -------
+1
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
jm@jmason.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|Undefined |3.1.0
------- Additional Comments From jm@jmason.org 2005-09-07 18:27 -------
changing milestone -- I agree this isn't a 3.1.0 blocker, but possibly for 3.1.1.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From lwilton@earthlink.net 2005-09-06 00:53 -------
Subject: Re: Mail with lots of To addresses in header triggers Bus error in Perl
BTW, there was another bus error perl bug reported a month or two back, I
believe on BSD, that also had something to do with large something. I don't
recall if it was large body, long URI, or many recipients. I htink that was
eventually closed as WFM, but perhaps should be re-evaluated.
This is definitely similar in many respects to that bug.
Loren
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
sidney@sidney.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Status Whiteboard|1 vote needed |
------- Additional Comments From sidney@sidney.com 2005-11-09 04:59 -------
+1
Committed revision 331942.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From sidney@sidney.com 2005-09-08 15:48 -------
Created an attachment (id=3121)
--> (http://bugzilla.spamassassin.org/attachment.cgi?id=3121&action=view)
New regexp that can handle large headers without segfaulting
4 million is enough for me. I think we could put this in to 3.1.0 since it is
1) a simple change; and 2) closes up a potential DoS vulnerability
The \Q \E is not strictly necessary as a security measure because $hdr is set
by the caller of the function, which has either hardcoded strings such as "To"
or else is from the user's configuration file for the report_safe_headers
option. However, it is a good idea to use \Q \E as $hdr is used as a plain
string. Good catch.
I have created a patch with the proposed regexp and I'm marking this for review
for 3.1.0. Committers, please vote.
I'll also check this into trunk.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From Mark.Martinec@ijs.si 2005-09-06 00:33 -------
The problem is easy to reproduce in a minimalistic one-line Perl form,
both on FreeBSD and on Linux (Perl v5.8.7 in all cases):
Linux:
$ perl -e '$h="To:"; $h.=" bla\@example.com\n" for (1..6020);
@a=$h=~/^(?:To:[ \t]+(.*\n(?:\s+\S.*\n)*))/mig'
Segmentation fault
FreeBSD:
$ perl -e '$h="To:"; $h.=" bla\@example.com\n" for (1..571);
@a=$h=~/^(?:To:[ \t]+(.*\n(?:\s+\S.*\n)*))/mig'
Bus error
The number of addresses is the minimal that causes a Perl crash on
a given system. If it doesn't go down on your system, increase the number.
For some reason the number is much lower with a default Perl installation
on FreeBSD than on Linux, but it sinks anyway.
Looks like the regexp should better be rewritten to a more stable form.
Mark
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From jm@jmason.org 2005-09-08 12:31 -------
thanks for the regexp -- it looks interesting.
why does "smgi" use *both* s and m? which one wins?
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[Bug 4570] [REVIEW] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From jm@jmason.org 2005-09-08 16:02 -------
+1
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From Mark.Martinec@ijs.si 2005-09-08 02:14 -------
I propose the following change:
old: /^(?:$hdr:[ \t]+(.*\n(?:\s+\S.*\n)*))/mig;
new: /^\Q$hdr\E:[ \t]+(.*?\n(?![ \t]))/smgi;
As far as I can tell it produces the same results, but extends
the number of handled lines from 500 (or 6500 on Linux) to a million.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From Mark.Martinec@ijs.si 2005-09-06 16:12 -------
> it does sound a *lot* like that bug -- I believe there's some
> platform-specific issue on FreeBSD to do with pthreads:...
This is part of the problem - it explains why the stack is smaller
on a default Perl 5.8.7 installation on FreeBSD compared to Linux,
but this doesn't address the core problem with the regular expression
used to parse long (un)folded header line.
Using nested subexpressions with * and + is evil and should be
carefully contemplated. Improper use can easily cause amazingly slow
backtracking or deep recursion potentially resulting in stack overflow.
While it is debatable if Perl's inability to catch stack overflow
is a bug or an implementational limitation, we have no choice but
to live with it.
Keeping the original test case in a further simplified form in mind:
$ perl -e '$h.=" bla\n" for (1..6500); $h=~/^(\s+\S.*\n)*/'
Segmentation fault (on Linux)
please read the following section from perlretut man page:
> Most of the time, all this moving forward and backtracking happens
> quickly and searching is fast. There are some pathological regexps,
> however, whose execution time exponentially grows with the size of the
> string. A typical structure that blows up in your face is of the form
> /(a|b+)*/;
> The problem is the nested indeterminate quantifiers. There are many
> different ways of partitioning a string of length n between the "+" and
> "*": one repetition with "b+" of length n, two repetitions with the
> first "b+" length k and the second with length n-k, m repetitions whose
> bits add up to length n, etc. In fact there are an exponential number
> of ways to partition a string as a function of length. A regexp may
> get lucky and match early in the process, but if there is no match,
> perl will try every possibility before giving up. So be careful with
> nested "*"'s, "{n,m}"'s, and "+"'s.
See also the section on "Independent subexpressions" in the same man page.
Mark
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
wtogami@redhat.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
Target Milestone|3.1.0 |3.0.5
------- Additional Comments From wtogami@redhat.com 2005-09-11 03:00 -------
Retargeting for 3.0.5.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From Mark.Martinec@ijs.si 2005-09-08 15:09 -------
> Can someone see how many lines the regexp can handle
> on a FreeBSD system that has the lower limit?
Almost 4 million lines (possibly more) on a FreeBSD 5.4 with a
default Perl install of 5.8.7, and 30 million on a Linux.
[talking about the following test case:
perl -e '$hdr="to"; $h="To:"; $h.=" bla\@example.com\n" for (1..4000000/3);
$h=$h.$h."From: bla to: me\n".$h;
@a=$h=~/^\Q$hdr\E:[ \t]+(.*?\n(?![ \t]))/smgi; printf("%d\n",scalar(@a))'
]
Btw, I'm assuming the $hdr is not supposed to be a regular expression,
but a plain string, for which \Q...\E quoting is more appropriate.
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[Bug 4570] [REVIEW] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
spamassassin@dostech.ca changed:
What |Removed |Added
----------------------------------------------------------------------------
Status Whiteboard|needs two votes |can be committed
------- Additional Comments From spamassassin@dostech.ca 2005-09-09 21:17 -------
+1
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
------- Additional Comments From mjc@apache.org 2005-11-01 11:42 -------
Use identifier CVE-2005-3351 for this issue.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl [CVE-2005-3351]
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4570
------- Additional Comments From wtogami@redhat.com 2005-11-07 21:51 -------
Created an attachment (id=3238)
--> (http://issues.apache.org/SpamAssassin/attachment.cgi?id=3238&action=view)
spamassassin-3.0.4-4570-avoid-segfault-large-headers.patch
Testing of this patch in the past month has been fine.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From sidney@sidney.com 2005-09-08 12:57 -------
Both s and m are needed for ^ and .* to each have the correct meanings in that
expression. From man perlretut:
"both s and m modifiers (//sm): Treat string as a single long line, but detect
multiple lines. �.� matches any character, even "\n". "^" and "$", however,
are able to match at the start or end of any line within the string."
The ^ in the expression finds header strings at the beginning of lines within
the multi-line string, but .* will match the embedded \n characters with the
negated lookahead stoppping before the start of the next header.
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[Bug 4570] Mail with lots of To addresses in header triggers Bus error in Perl
Posted by bu...@bugzilla.spamassassin.org.
http://bugzilla.spamassassin.org/show_bug.cgi?id=4570
------- Additional Comments From jm@jmason.org 2005-09-06 10:30 -------
it does sound a *lot* like that bug -- I believe there's some platform-specific
issue on FreeBSD to do with pthreads:
http://www.nntp.perl.org/group/perl.perl5.porters/103500
http://rt.perl.org/rt3/Ticket/Display.html?id=36667
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