Bug 726475
| Summary: | sssd_pam leaks file descriptors. | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Stephen Gallagher <sgallagh> | |
| Component: | sssd | Assignee: | Stephen Gallagher <sgallagh> | |
| Status: | CLOSED ERRATA | QA Contact: | Chandrasekar Kannan <ckannan> | |
| Severity: | urgent | Docs Contact: | ||
| Priority: | urgent | |||
| Version: | 6.1 | CC: | benl, dpal, franta, grajaiya, jeffschroeder, jgalipea, jhrozek, jwest, kbanerje, mfuruta, msvoboda, prc | |
| Target Milestone: | rc | Keywords: | ZStream | |
| Target Release: | --- | |||
| Hardware: | Unspecified | |||
| OS: | Unspecified | |||
| Whiteboard: | ||||
| Fixed In Version: | sssd-1.5.1-46.el6 | Doc Type: | Bug Fix | |
| Doc Text: |
Previously, SSSD did not properly close its PAM sockets after an authentication attempt, which eventually resulted in process resource exhaustion and a denial of service situation. The code has been modified to fix this issue, and file descriptors are now properly released when they are no longer in use.
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Story Points: | --- | |
| Clone Of: | ||||
| : | 748855 (view as bug list) | Environment: | ||
| Last Closed: | 2011-12-06 16:39:13 UTC | Type: | --- | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 727041, 748855 | |||
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Description
Stephen Gallagher
2011-07-28 18:30:51 UTC
Can we get a Z-Stream patch for this? This bug affects our RHEL6 postfix mailservers. It causes sssd to not allow logins which is effectively a denial of service. To us, this is a blocker bug. Note to QA: the reproducer from https://bugzilla.redhat.com/show_bug.cgi?id=725281 can also be used to verify this issue.
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New Contents:
Previously, SSSD did not properly close its PAM sockets after an authentication attempt, which eventually resulted in process resource exhaustion and a denial of service situation. The code has been modified to fix this issue, and file descriptors are now properly released when they are no longer in use.
same problems at Fedora 14 i686 (sssd-1.5.11-2.fc14.i686). Here it block saslauthd, so no. of fd increases at both processes up to maximum number of open file descriptors (1024 in that case) and then things hungs at "too many open files" errors. @Frantisek: Yup, thats the exact same bug I saw that the fixed package takes care of. You just need to update your sssd version via yum (if it has hit the repositories yet). http://koji.fedoraproject.org/koji/buildinfo?buildID=257319 sssd-1.5.12-1.fc14.i686 (from F14 testing repo) after nearly two days and ~ 15000 requests seems working OK. (In reply to comment #10) > sssd-1.5.12-1.fc14.i686 (from F14 testing repo) after nearly two days and ~ > 15000 requests seems working OK. Good to hear that. Can you also add a positive karma to the update? https://admin.fedoraproject.org/updates/sssd-1.5.12-1.fc14 Re-opening the bug since the reproducer from https://bugzilla.redhat.com/show_bug.cgi?id=725281 fails to complete: # ./check_user -n 2000 kau20 Password: Error in "pam_authenticate": Authentication failure Authentication failure for user "kau20" in loop 177 Tested on build sssd-1.5.1-52.el6.x86_64 Works fine on a pristine machine. Will investigate the issue on my test machine and open a separate bug. # ./check_user -n 2000 kau20 Password: User "kau20" authenticated successfully 2000 times Verified on version: # rpm -qi sssd | head Name : sssd Relocations: (not relocatable) Version : 1.5.1 Vendor: Red Hat, Inc. Release : 53.el6 Build Date: Fri 30 Sep 2011 10:10:28 AM EDT Install Date: Mon 03 Oct 2011 02:57:07 AM EDT Build Host: hs20-bc2-3.build.redhat.com Group : Applications/System Source RPM: sssd-1.5.1-53.el6.src.rpm Size : 3551489 License: GPLv3+ Signature : (none) Packager : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla> URL : http://fedorahosted.org/sssd/ Summary : System Security Services Daemon (In reply to comment #16) Dear Kaushik Banerjee, Thank you so much for working on this bz, please let me know whtn test packages would be available to have Dell Japan's customer verified. (or we could do it with 52, or 53 as test packages to verify before releasing? (In reply to comment #17) > (In reply to comment #16) > Dear Kaushik Banerjee, > > Thank you so much for working on this bz, please let me know whtn test packages > would be available to have Dell Japan's customer verified. (or we could do it > with 52, or 53 as test packages to verify before releasing? This fix is present in the forthcoming RHEL 6.2 beta. Please install from there and test it out when the beta is released. Sorry, I forgot to note, this issue is also fixed in an errata for RHEL 6.1: http://rhn.redhat.com/errata/RHBA-2011-1143.html Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2011-1529.html |