linux-kernel - 3.3.0-next-20120321 crash in mls_compute

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Date:	Thu, 22 Mar 2012 14:02:30 -0400
From:	Valdis.Kletnieks@...edu
To:	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <james.l.morris@...cle.com>,
	Eric Paris <eparis@...isplace.org>
Cc:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov
Subject: 3.3.0-next-20120321 crash in mls_compute_sid at boot time...

Repeatable crash (3 for 3) at boot on my Dell Latitude laptop.  Userspace is
Fedora Rawhide, works OK on 3.3.0-rc6-next-20120305, so broken in the last 2
weeks or so. I'll go ahead and bisect it over the next few days if nobody
recognizes the issue..

successful boot from next-20120305:
[   57.293391] SELinux: initialized (dev configfs, type configfs), uses genfs_contexts
[   57.293427] SELinux: initialized (dev sysfs, type sysfs), uses genfs_contexts
[   57.299341] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
[   57.299420] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
[   57.301381] SELinux: initialized (dev dm-3, type ext4), uses xattr
[   57.301929] SELinux: initialized (dev dm-6, type ext4), uses xattr
[   57.389391] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
[   57.391364] SELinux: initialized (dev cgroup, type cgroup), uses genfs_contexts
[   57.580314] SELinux: initialized (dev cgroup, type cgroup), uses genfs_contexts
[   57.583127] SELinux: initialized (dev cgroup, type cgroup), uses genfs_contexts

and we continue.  On 0321, we apparently bomb on the tmpfs after dm-6 (which
assuming we're walking in /proc/mounts order would be /run:

/dev/mapper/vg_blackice-root / ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 0 0
/dev/mapper/vg_blackice-usr /usr ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 0 0
tmpfs /run tmpfs rw,seclabel,nosuid,nodev,relatime,mode=755 0 0

In any case, it would be one of these:

% grep tmpfs /proc/mounts
devtmpfs /dev devtmpfs rw,seclabel,nosuid,relatime,size=2009804k,nr_inodes=502451,mode=755 0 0
tmpfs /dev/shm tmpfs rw,seclabel,relatime 0 0
tmpfs /run tmpfs rw,seclabel,nosuid,nodev,relatime,mode=755 0 0
tmpfs /sys/fs/cgroup tmpfs rw,seclabel,nosuid,nodev,noexec,relatime,mode=755 0 0
tmpfs /media tmpfs rw,seclabel,nosuid,nodev,noexec,relatime,mode=755 0 0
tmpfs /tmp tmpfs rw,seclabel,relatime,size=1048576k 0 0
tmpfs /var/run tmpfs rw,seclabel,nosuid,nodev,relatime,mode=755 0 0
tmpfs /var/lock tmpfs rw,seclabel,nosuid,nodev,relatime,mode=755 0 0

The traceback:
[   28.049217] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
[   28.049434] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
[   28.051332] SELinux: initialized (dev dm-3, type ext4), uses xattr
[   28.051878] SELinux: initialized (dev dm-6, type ext4), uses xattr
[   28.064712] type=1403 audit(1332432761.063:2): policy loaded auid=4294967295 ses=4294967295
[   28.069261] BUG: unable to handle kernel NULL pointer dereference at 000000000000003b
[   28.069558] IP: [<ffffffff81219974>] mls_compute_sid+0x99/0x104
[   28.069758] PGD 117754067 PUD 116907067 PMD 0
[   28.070076] Oops: 0000 [#1] PREEMPT SMP
[   28.070076] CPU 1
[   28.070076] Modules linked in:
[   28.070076]
[   28.070076] Pid: 1, comm: systemd Not tainted 3.3.0-next-20120321 #4 Dell Inc. Latitude E6500           /
[   28.070076] RIP: 0010:[<ffffffff81219974>]  [<ffffffff81219974>] mls_compute_sid+0x99/0x104
[   28.070076] RSP: 0018:ffff88011a097cd8  EFLAGS: 00010246
[   28.070076] RAX: 0000000000000000 RBX: ffff8801172320c8 RCX: 0000000000000010
[   28.070076] RDX: 0000000000000000 RSI: ffff88011a097cec RDI: ffff880117329420
[   28.070076] RBP: ffff88011a097d18 R08: ffff88011a097d80 R09: 0000000000000000
[   28.070076] R10: ffff880118d78000 R11: 0000000000000000 R12: ffff8801190a5248
[   28.070076] R13: 0000000000000000 R14: ffff8801190a5248 R15: ffff8801172320c8
[   28.070076] FS:  00007fd07127c840(0000) GS:ffff88011fd00000(0000) knlGS:0000000000000000
[   28.070076] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   28.070076] CR2: 000000000000003b CR3: 0000000117559000 CR4: 00000000000407e0
[   28.070076] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   28.070076] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   28.070076] Process systemd (pid: 1, threadinfo ffff88011a096000, task ffff88011a094040)
[   28.070076] Stack:
[   28.070076]  ffffffff81a44000 ffff88011a097d80 0000097f1a097d18 0000000000000754
[   28.070076]  ffffffff81215972 0000000000000000 0000000000000010 ffff880117470b00
[   28.070076]  ffff88011a097df8 ffffffff81215c15 ffff88011a097d48 ffffffff810714ab
[   28.070076] Call Trace:
[   28.070076]  [<ffffffff81215972>] ? security_compute_sid.part.9+0x4a/0x372
[   28.070076]  [<ffffffff81215c15>] security_compute_sid.part.9+0x2ed/0x372
[   28.070076]  [<ffffffff810714ab>] ? trace_hardirqs_on_caller+0x123/0x17f
[   28.070076]  [<ffffffff81215ccc>] security_compute_sid+0x32/0x34
[   28.070076]  [<ffffffff81216645>] security_transition_sid_user+0x22/0x24
[   28.070076]  [<ffffffff812165c6>] ? security_context_to_sid+0x14/0x16
[   28.070076]  [<ffffffff8120c90c>] sel_write_create+0x179/0x23e
[   28.070076]  [<ffffffff8120d4f3>] ? sel_write_load+0x66e/0x66e
[   28.070076]  [<ffffffff8120c793>] ? sel_write_relabel+0x17b/0x17b
[   28.070076]  [<ffffffff8120d55f>] selinux_transaction_write+0x6c/0x95
[   28.070076]  [<ffffffff81108cce>] vfs_write+0xde/0x13b
[   28.070076]  [<ffffffff81108f0c>] sys_write+0x3e/0x6b
[   28.070076]  [<ffffffff815e4122>] system_call_fastpath+0x16/0x1b
[   28.070076] Code: ff 4c 8b 45 c8 48 85 c0 44 8a 4d c0 74 0d 48 89 c6 4c 89 c7 e8 d0 fc ff ff eb 70 48 8b 05 9d bf 24 01 41 0f b7 d5 48 8b 44 d0 f8 <8a> 40 3b ff c8 3c 05 77 2e 0f b6 c0 ff 24 c5 d0 4c 6481 48 89
[   28.070076] RIP  [<ffffffff81219974>] mls_compute_sid+0x99/0x104
[   28.070076]  RSP <ffff88011a097cd8>
[   28.070076] CR2: 000000000000003b
[   28.089014] ---[ end trace c3f2f492efc8ebcc ]---


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