v0.8.1
https://github.com/torvalds/linux
dump_tasks() needs to hold the RCU read lock around its access of the target task's UID. To this end it should use task_uid() as it only needs that one thing from the creds. The fact that dump_tasks() holds tasklist_lock is insufficient to prevent the target process replacing its credentials on another CPU. Then, this patch change to call rcu_read_lock() explicitly. =================================================== [ INFO: suspicious rcu_dereference_check() usage. ] --------------------------------------------------- mm/oom_kill.c:410 invoked rcu_dereference_check() without protection! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 1 4 locks held by kworker/1:2/651: #0: (events){+.+.+.}, at: [<ffffffff8106aae7>] process_one_work+0x137/0x4a0 #1: (moom_work){+.+...}, at: [<ffffffff8106aae7>] process_one_work+0x137/0x4a0 #2: (tasklist_lock){.+.+..}, at: [<ffffffff810fafd4>] out_of_memory+0x164/0x3f0 #3: (&(&p->alloc_lock)->rlock){+.+...}, at: [<ffffffff810fa48e>] find_lock_task_mm+0x2e/0x70 Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- v2.6.19-rc1
- v2.6.19
- v2.6.18-rc7
- v2.6.18-rc6
- v2.6.18-rc5
- v2.6.18-rc4
- v2.6.18-rc3
- v2.6.18-rc2
- v2.6.18-rc1
- v2.6.18
- v2.6.17-rc6
- v2.6.17-rc5
- v2.6.17-rc4
- v2.6.17-rc3
- v2.6.17-rc2
- v2.6.17-rc1
- v2.6.17
- v2.6.16-rc6
- v2.6.16-rc5
- v2.6.16-rc4
- v2.6.16-rc3
- v2.6.16-rc2
- v2.6.16-rc1
- v2.6.16
- v2.6.15-rc7
- v2.6.15-rc6
- v2.6.15-rc5
- v2.6.15-rc4
- v2.6.15-rc3
- v2.6.15-rc2
- v2.6.15-rc1
- v2.6.15
- v2.6.14-rc5
- v2.6.14-rc4
- v2.6.14-rc3
- v2.6.14-rc2
- v2.6.14-rc1
- v2.6.14
- v2.6.13-rc7
- v2.6.13-rc6
- v2.6.13-rc5
- v2.6.13-rc4
- v2.6.13-rc3
- v2.6.13-rc2
- v2.6.13-rc1
- v2.6.13
- v2.6.12-rc6
- v2.6.12-rc5
- v2.6.12-rc4
- v2.6.12-rc3
- v2.6.12-rc2
- v2.6.12
- v2.6.11-tree
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oom: __task_cred() need rcu_read_lock()
File | Mode | Size |
---|---|---|
hw_breakpoint | ||
kfifo | ||
kobject | ||
kprobes | ||
trace_events | ||
tracepoints | ||
Kconfig | -rw-r--r-- | 1.5 KB |
Makefile | -rw-r--r-- | 135 bytes |
Computing file changes ...