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Bug 1116347 - CVE-2014-3631 BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [fedora-all]
Summary: CVE-2014-3631 BUG: unable to handle kernel NULL pointer dereference at 000000...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 20
Hardware: x86_64
OS: Unspecified
unspecified
urgent
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: AcceptedFreezeException
Depends On:
Blocks: F21AlphaFreezeException
TreeView+ depends on / blocked
 
Reported: 2014-07-04 09:34 UTC by Lorenzo Sartoratti
Modified: 2014-09-30 01:58 UTC (History)
12 users (show)

Fixed In Version: kernel-3.14.19-100.fc19
Doc Type: Release Note
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-09-19 10:09:53 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
Fix for keyrings garbage collector (4.21 KB, patch)
2014-09-09 19:01 UTC, David Howells 		no flags Details | Diff
View All

Description Lorenzo Sartoratti 2014-07-04 09:34:56 UTC 
Description of problem:
We have two virtual machines with Fedora 20 on two different hosts with Fedora 20.
From kernels 3.13 and subsequent, the virtual machine stop responding exactly after 3 days from boot.

Version-Release number of selected component (if applicable):
kernel 3.13 and subsequent.
Now we are using 3.14.9-200

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
here are the messages on the console
[260027.360246] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[260027.361115] IP: [<ffffffff8136cea7>] assoc_array_gc+0x2f7/0x540
[260027.361115] PGD dae15067 PUD cfc24067 PMD 0
[260027.361115] Oops: 0000 [#1] SMP
[260027.361115] Modules linked in: xt_nat xt_mark nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_ni
[260027.361115] CPU: 0 PID: 26011 Comm: kworker/0:1 Not tainted 3.14.9-200.fc20.x86_64 #1
[260027.361115] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[260027.361115] Workqueue: events key_garbage_collector
[260027.361115] task: ffff8800918bd580 ti: ffff8800aac14000 task.ti: ffff8800aac14000
[260027.361115] RIP: 0010:[<ffffffff8136cea7>] [<ffffffff8136cea7>] assoc_array_gc+0x2f7/0x540
[260027.361115] RSP: 0018:ffff8800aac15d40  EFLAGS: 00010206
[260027.361115] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8800aaecacc0
[260027.361115] RDX: ffff8800daecf440 RSI: 0000000000000001 RDI: ffff8800aadc2bc0
[260027.361115] RBP: ffff8800aac15da8 R08: 0000000000000001 R09: 0000000000000003
[260027.361115] R10: ffffffff8136ccc7 R11: 0000000000000000 R12: 0000000000000000
[260027.361115] R13: 0000000000000000 R14: 0000000000000070 R15: 0000000000000001
[260027.361115] FS:  0000000000000000(0000) GS:ffff88011fc00000(0000) knlGS:0000000000000000
[260027.361115] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[260027.361115] CR2: 0000000000000018 CR3: 00000000db10d000 CR4: 00000000000006f0
[260027.361115] Stack:
[260027.361115]  ffff8800aac15d50 0000000000000011 ffff8800aac15db8 ffffffff812e2a70
[260027.361115]  ffff880091a00600 0000000000000000 ffff8800aadc2bc3 00000000cd42c987
[260027.361115]  ffff88003702df20 ffff88003702dfa0 0000000053b65c09 ffff8800aac15fd8
[260027.361115] Call Trace:
[260027.361115]  [<ffffffff812e2a70>] ? keyring_detect_cycle_iterator+0x30/0x30
[260027.361115]  [<ffffffff812e3e75>] keyring_gc+0x75/0x80
[260027.361115]  [<ffffffff812e1424>] key_garbage_collector+0x154/0x3c0
[260027.361115]  [<ffffffff810a67b6>] process_one_work+0x176/0x430
[260027.361115]  [<ffffffff810a744b>] worker_thread+0x11b/0x3a0
[260027.361115]  [<ffffffff810a7330>] ? rescuer_thread+0x3b0/0x3b0
[260027.361115]  [<ffffffff810ae1a8>] kthread+0xd8/0xf0
[260027.361115]  [<ffffffff810ae0d0>] ? insert_kthread_work+0x40/0x40
[260027.361115]  [<ffffffff816ffb7c>] ret_from_fork+0x7c/0xb0
[260027.361115]  [<ffffffff810ae0d0>] ? insert_kthread_work+0x40/0x40
[260027.361115] Code: 08 4c 8b 22 0f 84 bf 00 00 00 41 83 c7 01 49 83 e4 fc 41 83 ff 0f 4c 89 65 c0 0f 8f 5a fe ff ff 48 8b 45 c0 4d 63 cf 49 83 c1 02 <4e> 8b 34 c8 4d 85 f6 0f 84 be 00 00 00 41 f6 c6 01 0f 84 92
[260027.361115] RIP  [<ffffffff8136cea7>] assoc_array_gc+0x2f7/0x540
[260027.361115]  RSP <ffff8800aac15d40>
[260027.361115] CR2: 0000000000000018
[260027.361115] ---[ end trace 1129028a088c0cbd ]---
[260027.407625] BUG: unable to handle kernel paging request at ffffffffffffffd8
[260027.408434] IP: [<ffffffff810ae790>] kthread_data+0x10/0x20
[260027.408434] PGD 1c0f067 PUD 1c11067 PMD 0
[260027.408434] Oops: 0000 [#2] SMP
Comment 1 Lorenzo Sartoratti 2014-08-24 10:07:07 UTC 
Hi
the problem is still there.
Now we are using the latest Fedora 20 kernel, 3.15.10-200
The system hang after 3 days and a few hours.
Thank you for your support!

Lorenzo
Comment 2 David Howells 2014-09-09 15:58:08 UTC 
IP: [<ffffffff8136cea7>] assoc_array_gc+0x2f7/0x540

I think this is line 1550:

		ptr = node->slots[slot];

RAX is node and R15 is slot.
Comment 3 David Howells 2014-09-09 19:01:10 UTC 
Created attachment 935884 [details]
Fix for keyrings garbage collector

I managed to reproduce the problem in a userspace test harness.  The problem is that gc doesn't correctly handle the root node being a shortcut.  This patch should fix it.
Comment 4 Josh Boyer 2014-09-10 12:40:21 UTC 
Thanks David.  I'll get this rolled into the Fedora kernels today.  I'm assuming you're going to send this upstream with stable CC'd?
Comment 5 Josh Boyer 2014-09-10 18:44:09 UTC 
Fixed in Fedora git.
Comment 6 Fedora Blocker Bugs Application 2014-09-11 12:21:28 UTC 
Proposed as a Freeze Exception for 21-alpha by Fedora user jwboyer using the blocker tracking app because:

 This is a security issue where a local unprivileged user could crash the system.
Comment 7 Fedora Update System 2014-09-11 18:34:28 UTC 
kernel-3.16.2-301.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/kernel-3.16.2-301.fc21
Comment 8 Fedora Update System 2014-09-11 22:11:44 UTC 
Package kernel-3.16.2-301.fc21:
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-3.16.2-301.fc21'
as soon as you are able to, then reboot.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-10693/kernel-3.16.2-301.fc21
then log in and leave karma (feedback).
Comment 9 Mike Ruckman 2014-09-11 22:35:00 UTC 
+1 FE
Comment 10 Marek Doležel 2014-09-11 23:29:07 UTC 
+1 FE



-- 
Fedora Bugzappers volunteer triage team
https://fedoraproject.org/wiki/BugZappers
Comment 11 Lorenzo Sartoratti 2014-09-15 09:40:41 UTC 
Hi
are you going to build a F20 kernel?

Lorenzo
Comment 12 David Howells 2014-09-15 09:46:36 UTC 
The patch has been applied upstream:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95389b08d93d5c06ec63ab49bd732b0069b7c35e
Comment 13 Josh Boyer 2014-09-15 13:25:24 UTC 
(In reply to Lorenzo Sartoratti from comment #11)
> Hi
> are you going to build a F20 kernel?
> 
> Lorenzo

Yes.
Comment 14 Adam Williamson 2014-09-16 15:32:13 UTC 
+1 FE, that gives it enough votes for accepted status. Sorry we missed reviewing this prior to RC1 :(
Comment 15 Fedora Update System 2014-09-17 11:57:20 UTC 
kernel-3.16.2-201.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/kernel-3.16.2-201.fc20
Comment 16 Fedora Update System 2014-09-18 13:24:37 UTC 
kernel-3.14.19-100.fc19 has been submitted as an update for Fedora 19.
https://admin.fedoraproject.org/updates/kernel-3.14.19-100.fc19
Comment 17 Fedora Update System 2014-09-19 10:09:53 UTC 
kernel-3.16.2-201.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 18 Fedora Update System 2014-09-23 04:50:34 UTC 
kernel-3.16.2-301.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 19 Lorenzo Sartoratti 2014-09-23 07:30:49 UTC 
Hi,
after 6 days with the patched kernel both f20 virtual machines are still up and running.
Thank you for your work!
Great job!

Lorenzo
Comment 20 Fedora Update System 2014-09-30 01:58:43 UTC 
kernel-3.14.19-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
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