* mc 4.8.19: segfaults while searching for contents
@ 2017-10-03 6:50 Matthias Fischer
2017-10-03 7:24 ` Matthias Fischer
0 siblings, 1 reply; 4+ messages in thread
From: Matthias Fischer @ 2017-10-03 6:50 UTC (permalink / raw)
To: development
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Hi,
Suddenly 'mc 4.8.19' starts throwing segfaults each time I search for contents in multiple files, e.g. in a directory structure like '/usr/local/bin'. Searching in SINGLE files or in a directory which contains only *.sh-files is ok):
...
07:42:32 kernel: mc[17515]: segfault at a39349a0 ip a2fbdf81 sp b0f41af4 error 4 in libpcre.so.1.2.9[a2f94000+44000]
07:42:32 kernel: grsec: From 192.168.100.1: Segmentation fault occurred at a39349a0 in /usr/bin/m c[mc:17515] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:16795] uid/euid:0/0 gid/egid:0/0
07:42:32 kernel: grsec: From 192.168.100.1: denied resource overstep by requesting 4096 for RLIMIT_CORE against limit 0 for /usr/bin/mc[mc:17515] uid/euid:0/0 gid/egid:0/0, parent /bin/bash[bash:16795] uid/euid:0/0 gid/egid:0/0
...
The same happens on a fresh test installation.
Right now I'm thinking about using 'paxctl' on '/usr/bin/mc', but I'm not really sure...:
1. If this would be a solution
2. Which options to use - and
3. On which parts ('/usr/bin/mc'?) exactly.
I'm testing with:
...
paxctl -cm /usr/bin/mc
...
But had no luck until now.
Anybody got a hint or experiencing the same?
Best,
Matthias
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: mc 4.8.19: segfaults while searching for contents 2017-10-03 6:50 mc 4.8.19: segfaults while searching for contents Matthias Fischer @ 2017-10-03 7:24 ` Matthias Fischer 2017-10-04 15:41 ` Michael Tremer 0 siblings, 1 reply; 4+ messages in thread From: Matthias Fischer @ 2017-10-03 7:24 UTC (permalink / raw) To: development [-- Attachment #1: Type: text/plain, Size: 991 bytes --] 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 ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: mc 4.8.19: segfaults while searching for contents 2017-10-03 7:24 ` Matthias Fischer @ 2017-10-04 15:41 ` Michael Tremer 2017-10-04 16:34 ` Matthias Fischer 0 siblings, 1 reply; 4+ messages in thread From: Michael Tremer @ 2017-10-04 15:41 UTC (permalink / raw) To: development [-- Attachment #1: Type: text/plain, Size: 1310 bytes --] Hi, 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?! Did you try to update mc? -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 [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --] ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: mc 4.8.19: segfaults while searching for contents 2017-10-04 15:41 ` Michael Tremer @ 2017-10-04 16:34 ` Matthias Fischer 0 siblings, 0 replies; 4+ messages in thread From: Matthias Fischer @ 2017-10-04 16:34 UTC (permalink / raw) To: development [-- Attachment #1: Type: text/plain, Size: 1642 bytes --] 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 > ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-10-04 16:34 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2017-10-03 6:50 mc 4.8.19: segfaults while searching for contents Matthias Fischer 2017-10-03 7:24 ` Matthias Fischer 2017-10-04 15:41 ` Michael Tremer 2017-10-04 16:34 ` Matthias Fischer
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