GNU bug report logs - #18266
grep -P and invalid exits with error

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Message #13 received at 18266 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 758105 <at> bugs.debian.org
Cc: Santiago <santiago <at> debian.org>, 18266 <at> debbugs.gnu.org
Subject: Re: Bug#758105: bug#18266: grep -P and invalid exits with error
Date: Thu, 14 Aug 2014 19:44:42 +0200

On 2014-08-14 09:15:58 -0700, Paul Eggert wrote:
> That commit was necessary to avoid undefined behavior in libpcre.  We can't
> simply undo the commit (unless you want to reintroduce security holes into
> grep :-).  The current behavior is the best we can do, unless someone fixes
> libpcre (which doesn't appear to be likely), or unless someone takes the
> time to write code in grep to work around the problem.
> 
> One way forward is suggested in <http://bugs.gnu.org/17245#43>.  No doubt
> there are others.  Can you suggest a volunteer to take this on?

Discarding input lines with invalid UTF-8 sequences is not OK.
IMHO, it would be better to replace invalid UTF-8 sequences by
zero bytes before passing them to libpcre. Is it allowed to do
that in Pexecute()?

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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