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Tasklist

FS#64666 - PAM Authentication failed with abnormal exit status code 139

Attached to Project: Community Packages
Opened by Nabil Bourenane (Guy Cpario) - Wednesday, 27 November 2019, 13:20 GMT
Last edited by freswa (frederik) - Friday, 21 February 2020, 21:24 GMT
Task Type Bug Report
Category Packages
Status Assigned
Assigned To Sergej Pupykin (sergej)
Architecture All
Severity Critical
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No

Details

Description:
Whenever I start the vboxweb service, GUI crashes infinitely, phpVirtualbox can't authenticates through PAM.

Additional info:
* package version(s)
- Linux automation 5.3.13-arch1-1 #1 SMP PREEMPT Sun, 24 Nov 2019 10:15:50 +0000 x86_64 GNU/Linux
- virtualbox-6.0.14-3
- virtualbox-host-modules-arch 6.0.14-9
- phpvirtualbox 5.2_1-1
- nginx-1.16.1-1
- pam-1.3.1-2
- pambase 20190105.1-2

* config and/or log files etc.
% sudo journalctl -xeu vboxweb
Nov 27 12:04:13 automation vboxwebsrv[188455]: pam_unix(login:auth): unix_chkpwd abnormal exit: 139
Nov 27 12:04:13 automation vboxwebsrv[188455]: pam_unix(login:auth): unix_chkpwd abnormal exit: 139
Nov 27 12:04:13 automation vboxwebsrv[188455]: pam_unix(login:auth): authentication failure; logname= uid=1001 euid=1001 tty= ruser= rhost= user=vbox

Probably due to this commit:
https://git.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/pam&id=5340fb9f7d4e6a496fa402ae0adb97852b7772b7

Steps to reproduce:
Install virtualbox, phpVirtualBox and nginx, run vboxweb.service with a dedicated user following the wiki: https://wiki.archlinux.org/index.php/PhpVirtualBox.

% sudo systemctl start vboxweb
GUI crashes and prints "pam_unix(login:auth): unix_chkpwd abnormal exit: 139" in logs.

With current PAM version, it fails:
- pam-1.3.1-2
- pambase 20190105.1-2

Downgrade PAM to previous release and it works:
- pam-1.3.1-1
- pambase-20190105.1-1
This task depends upon

Comment by Christian Hesse (eworm) - Wednesday, 27 November 2019, 13:35 GMT
Exit code 139 is caused by SIGSEGV, so anything crashed with segmentation fault.
Comment by Nabil Bourenane (Guy Cpario) - Wednesday, 27 November 2019, 14:46 GMT
You're right, I didn't gather this information.

% dmesg
[67148.200827] audit: type=1100 audit(1574851912.484:1535): pid=212362 uid=1001 auid=4294967295 ses=4294967295 msg='op=PAM:unix_chkpwd acct="vbox" exe="/usr/bin/unix_chkpwd" hostname=? addr=? terminal=? res=success'
[67148.331636] SQW01[212365]: segfault at 7fdee2b6d110 ip 00007fdee2b6d110 sp 00007fdee2d8c758 error 15
[67148.331641] Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[67148.331746] audit: type=1701 audit(1574851912.617:1536): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=212365 comm="SQW01" exe="/usr/lib/virtualbox/vboxwebsrv" sig=11 res=1
[67148.352970] audit: type=1130 audit(1574851912.637:1537): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-coredump@91-212366-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[67154.171817] show_signal_msg: 13 callbacks suppressed

I'm actually confused and don't know if I should rollback pam or virtualbox, I can't test actually, I'll bring more information later.
Comment by Nabil Bourenane (Guy Cpario) - Thursday, 28 November 2019, 11:36 GMT
Hello,

I tried with virtualbox-6.0.14-1:
[50634.000278] VBoxSVCWatcher[48961]: segfault at 7ff8c8427110 ip 00007ff8c8427110 sp 00007ff8c869c7a8 error 14
[50634.000285] Code: Bad RIP value.
[50634.000389] audit: type=1701 audit(1574938913.789:1332): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=48961 comm="VBoxSVCWatcher" exe="/usr/lib/virtualbox/vboxwebsrv" sig=11 res=1

I then tried with virtualbox-6.0.14-4:
[51695.258327] SQW05[69041]: segfault at 7fd5a9851110 ip 00007fd5a9851110 sp 00007fd5a95a8758 error 15
[51695.258332] Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[51695.258460] audit: type=1701 audit(1574939975.097:1883): auid=4294967295 uid=1001 gid=1001 ses=4294967295 pid=69041 comm="SQW05" exe="/usr/lib/virtualbox/vboxwebsrv" sig=11 res=1

To resume, with pam-1.3.1-2 and pambase 20190105.1-2, recent versions of virtualbox (6.0.14-[1|3|4]) result into a segfault when vboxwebsrv tries to authenticate to PAM.

The workaround is to downgrade to pam-1.3.1-1 and pambase-20190105.1-1.

I can't status if it's virtualbox fault or pam but recent versions are not complient to each other.
Comment by Christian Hesse (eworm) - Thursday, 28 November 2019, 16:23 GMT
Well, pam 1.3.1-2 and pambase 20190105.1-2 are just rebuilds... (I guess pambase does not change the game, as it does not contain executable files.)
Possibly related to the toolchain (glibc, gcc, ...) at build time?

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