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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2016-11-02 19:50:29 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-11-03 07:27:34 +0100 |
| commit | 382005027fedc50b28d40ae64ef1461cca38953e (patch) | |
| tree | 61e49510637dc732803389e7920f206946dc0afd /certs | |
| parent | 0c183d92b20b5c84ca655b45ef57b3318b83eb9e (diff) | |
| download | linux-382005027fedc50b28d40ae64ef1461cca38953e.tar.bz2 | |
sched/core: Fix oops in sched_show_task()
When CONFIG_THREAD_INFO_IN_TASK=y, it is possible that an exited thread
remains in the task list after its stack pointer was already set to NULL.
Therefore, thread_saved_pc() and stack_not_used() in sched_show_task()
will trigger NULL pointer dereference if an attempt to dump such thread's
traces (e.g. SysRq-t, khungtaskd) is made.
Since show_stack() in sched_show_task() calls try_get_task_stack() and
sched_show_task() is called from interrupt context, calling
try_get_task_stack() from sched_show_task() will be safe as well.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@alien8.de
Cc: brgerst@gmail.com
Cc: jann@thejh.net
Cc: keescook@chromium.org
Cc: linux-api@vger.kernel.org
Cc: tycho.andersen@canonical.com
Link: http://lkml.kernel.org/r/201611021950.FEJ34368.HFFJOOMLtQOVSF@I-love.SAKURA.ne.jp
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'certs')
0 files changed, 0 insertions, 0 deletions