linux-kernel - Re: [Feature Request?] Inline compression of process core dumps

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Message-ID: <461F87EC.7090609@theshore.net>
Date:	Fri, 13 Apr 2007 09:38:52 -0400
From:	"Christopher S. Aker" <caker@...shore.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andi Kleen <andi@...stfloor.org>,
	"Bill Rugolsky Jr." <brugolsky@...emetry-investments.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Feature Request?] Inline compression of process core dumps

Alan Cox wrote:
>> Looking at the code, it seems to me that format_corename() is appending 
>> .pid, regardless if !core_uses_pid and corename[0]=='|', in which case 
>> it creates an invalid path for call_usermodehelper_pipe().
>>
>> Bug in the code, or bug in my methods?
> 
> This looks somewhat better and might do the trick. Also fixes a very very
> obscure security corner case. If you change core pattern to start with
> the program name then the user can run a program called "|myevilhack" as
> it stands. The patch checks for "|" in the pattern not the output and
> doesn't nail a pid on to a piped name.

<snip>

Works great now.  Queue this sucker up!

	# cat /proc/sys/kernel/core_pattern
	|/home/caker/bin/dumper.pl
	# ./linux
	<blah blah>
	Segmentation fault (core dumped)
	# file /tmp/dumper.out
	/tmp/dumper.out: ELF 32-bit LSB core file Intel 80386, version 1 
(SYSV), SVR4-style

Thanks for everyone's help.

-Chris

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