GNU bug report logs - #19827
sed 4.2.2 hangs when passed specially crafted program

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alexander Nasonov <alnsn <at> yandex.ru>
To: bug-sed <at> gnu.org
Subject: sed 4.2.2 hangs when passed specially crafted program
Date: Tue, 10 Feb 2015 08:18:27 +0000

This was found by the afl fuzzer http://lcamtuf.coredump.cx/afl/

$ echo | gsed -f afl-out/crashes/id*03,*
^C

$ cat afl-out/crashes/id*03,*
$G
$D


$ hexdump -C afl-out/crashes/id*03,*
00000000  24 47 0a 24 44 0a 0a 0a                           |$G.$D...|
00000008


or

echo | gsed -e '$G
> $D
>
>
> '
^C

I ran the fuzzer and the test on NetBSD amd64 7.99.x.

Alex

Message #10 received at 19827-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: 19827-done <at> debbugs.gnu.org, Alexander Nasonov <alnsn <at> yandex.ru>
Subject: Re: sed 4.2.2 hangs when passed specially crafted program
Date: Sun, 3 May 2015 21:57:54 -0700

tags 19827 notabug
thanks

I've just noticed that there are some bug reports that have never
reached my inbox.
The first one I've examined is https://debbugs.gnu.org/19827, which reports
that you used the afl fuzzer http://lcamtuf.coredump.cx/afl/ to find that this
command never terminates:

  echo | sed/sed 'G;D'

However, that is a legitimate program, and
with that input, it happens to specify an endless loop.
Thus, I'm marking this as "notabug" and closing the issue.
However, you are welcome to make further comments.

Thank you for helping to test GNU sed!
I'm planning to release sed-3.4 soon, so if you have more
time for testing (using the latest from git), it'd be great to
see how we're doing.

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