GNU bug report logs - #16586
grep: infinite loop in grep -P on some files with invalid UTF-8 sequences

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Message #34 received at 16586-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Norihiro Tanaka <noritnk <at> kcn.ne.jp>, 17245-done <at> debbugs.gnu.org, 
 16586-done <at> debbugs.gnu.org
Subject: Re: bug#17245: GREP BUG: grep -P and binary files
Date: Mon, 21 Apr 2014 11:03:10 -0700

[Message part 1 (text/plain, inline)]

On 04/16/2014 05:13 AM, Norihiro Tanaka wrote:
> http://bugs.exim.org/show_bug.cgi?id=1468 

Thanks.  The response there makes it clear that if grep passes arbitrary 
binary data to PCRE, and if grep uses PCRE_NO_UTF8_CHECK, undefined 
behavior will result (maybe infinite loop, core dump, etc.).  We can't 
have undefined behavior in grep.  A simple fix is to avoid using 
PCRE_NO_UTF8_CHECK so I installed the attached patch to do that.  
Perhaps we can think of a better way at some point.  In the meantime I'm 
taking the liberty of closing Bug#17245 and Bug#16586.

[0001-grep-P-now-rejects-invalid-input-sequences-in-UTF-8-.patch (text/x-patch, attachment)]

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