From: Matthias Fischer <matthias.fischer@ipfire.org>
To: development@lists.ipfire.org
Subject: Re: mc 4.8.19: segfaults while searching for contents
Date: Wed, 04 Oct 2017 18:34:19 +0200 [thread overview]
Message-ID: <b88ad684-f918-389b-de9a-25dbe4e03b0c@ipfire.org> (raw)
In-Reply-To: <1507131692.433.10.camel@ipfire.org>
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On 04.10.2017 17:41, Michael Tremer wrote:
> Hi,
Hello,
> this doesn't have anything to do with PaX. It's just a bug in mc.
>
> Probably has this problem with files that have the SUID bit set?!
Perhaps. Will look at this when I have the time again.
> Did you try to update mc?
I tested with several versions and clean compilations - its always the
same. On the 'Devel' machine (Ubuntu, mc 4.8.15, no PaX) everything works.
Best,
Matthias
> -Michael
>
> On Tue, 2017-10-03 at 09:24 +0200, Matthias Fischer wrote:
>> Hi,
>>
>> On 03.10.2017 08:50, Matthias Fischer wrote:
>> > ...
>> >
>> > Suddenly 'mc 4.8.19' starts throwing segfaults...
>> >
>> > ...
>>
>> This is weird.
>>
>> As soon as directory (e.g. '/usr/local/bin') contains the file
>> 'ipfirereboot', 'mc' crashes while searching for content 'flush' (e.g.).
>>
>> Thus, I would say, 'mc' has problems searching in (specific) binaries -
>> searching in '/usr/bin' has the same effect.
>>
>> And:
>>
>> The following 'paxctl'-options had NO effect:
>>
>> ...
>> root(a)ipfire: /usr/bin # paxctl -v /usr/bin/mc
>> PaX control v0.9
>> Copyright 2004,2005,2006,2007,2009,2010,2011,2012,2014 PaX Team
>> <pageexec(a)freemail.hu>
>>
>> - PaX flags: -p-s-m-x-e-- [/usr/bin/mc]
>> PAGEEXEC is disabled
>> SEGMEXEC is disabled
>> MPROTECT is disabled
>> RANDEXEC is disabled
>> EMUTRAMP is disabled
>> ...
>>
>> Searching in text-only files is ok, but as soon as directory contains
>> the above file (or something similar), 'mc' crashes.
>>
>> This does NOT happen on my devel with 'mc 4.8.15'... ;-)
>>
>> Best,
>> Matthias
>
prev parent reply other threads:[~2017-10-04 16:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 6:50 Matthias Fischer
2017-10-03 7:24 ` Matthias Fischer
2017-10-04 15:41 ` Michael Tremer
2017-10-04 16:34 ` Matthias Fischer [this message]
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