** Description changed:
+ SRU Justification:
+
+ Impact: Results in hard lock on tasklist_lock, ie. system freeze
+
+ Fix: Upstream commit 1780f2d3839a0d3eb85ee014a708f9e2c8f8ba0e
+ 2.6.38 stable commit ???pending???
+
+ Test Case: run the attached test from the apparmor regression test suite
+
+ ===
+
AppArmor is doing a GFP_KERNEL allocation in apparmor_task_setrlimit,
which MAY sleep while a spin lock is being held.
BUG: sleeping function called from invalid context at mm/slub.c:847
- in_atomic(): 1, irqs_disabled(): 0, pid: 1583, name: cupsd
- 2 locks held by cupsd/1583:
- #0: (tasklist_lock){.+.+.+}, at: [<ffffffff8104dafa>] do_prlimit+0x61/0x189
- #1: (&(&p->alloc_lock)->rlock){+.+.+.}, at: [<ffffffff8104db2d>]
+ in_atomic(): 1, irqs_disabled(): 0, pid: 1583, name: cupsd
+ 2 locks held by cupsd/1583:
+ #0: (tasklist_lock){.+.+.+}, at: [<ffffffff8104dafa>] do_prlimit+0x61/0x189
+ #1: (&(&p->alloc_lock)->rlock){+.+.+.}, at: [<ffffffff8104db2d>]
do_prlimit+0x94/0x189
- Pid: 1583, comm: cupsd Not tainted 3.0.0-rc2-git1 #7
- Call Trace:
- [<ffffffff8102ebf2>] __might_sleep+0x10d/0x112
- [<ffffffff810e6f46>] slab_pre_alloc_hook.isra.49+0x2d/0x33
- [<ffffffff810e7bc4>] kmem_cache_alloc+0x22/0x132
- [<ffffffff8105b6e6>] prepare_creds+0x35/0xe4
- [<ffffffff811c0675>] aa_replace_current_profile+0x35/0xb2
- [<ffffffff811c4d2d>] aa_current_profile+0x45/0x4c
- [<ffffffff811c4d4d>] apparmor_task_setrlimit+0x19/0x3a
- [<ffffffff811beaa5>] security_task_setrlimit+0x11/0x13
- [<ffffffff8104db6b>] do_prlimit+0xd2/0x189
- [<ffffffff8104dea9>] sys_setrlimit+0x3b/0x48
- [<ffffffff814062bb>] system_call_fastpath+0x16/0x1b
+ Pid: 1583, comm: cupsd Not tainted 3.0.0-rc2-git1 #7
+ Call Trace:
+ [<ffffffff8102ebf2>] __might_sleep+0x10d/0x112
+ [<ffffffff810e6f46>] slab_pre_alloc_hook.isra.49+0x2d/0x33
+ [<ffffffff810e7bc4>] kmem_cache_alloc+0x22/0x132
+ [<ffffffff8105b6e6>] prepare_creds+0x35/0xe4
+ [<ffffffff811c0675>] aa_replace_current_profile+0x35/0xb2
+ [<ffffffff811c4d2d>] aa_current_profile+0x45/0x4c
+ [<ffffffff811c4d4d>] apparmor_task_setrlimit+0x19/0x3a
+ [<ffffffff811beaa5>] security_task_setrlimit+0x11/0x13
+ [<ffffffff8104db6b>] do_prlimit+0xd2/0x189
+ [<ffffffff8104dea9>] sys_setrlimit+0x3b/0x48
+ [<ffffffff814062bb>] system_call_fastpath+0x16/0x1b
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => John Johansen (jjohansen)
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https://bugs.launchpad.net/bugs/798860
Title:
AppArmor: BUG: sleeping function called from invalid context
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