This is a note to let you know that I've just added the patch titled sched: panic on corrupted stack end to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sched-panic-on-corrupted-stack-end.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 29d6455178a09e1dc340380c582b13356227e8df Mon Sep 17 00:00:00 2001 From: Jann Horn <jannh@xxxxxxxxxx> Date: Wed, 1 Jun 2016 11:55:07 +0200 Subject: sched: panic on corrupted stack end From: Jann Horn <jannh@xxxxxxxxxx> commit 29d6455178a09e1dc340380c582b13356227e8df upstream. Until now, hitting this BUG_ON caused a recursive oops (because oops handling involves do_exit(), which calls into the scheduler, which in turn raises an oops), which caused stuff below the stack to be overwritten until a panic happened (e.g. via an oops in interrupt context, caused by the overwritten CPU index in the thread_info). Just panic directly. Signed-off-by: Jann Horn <jannh@xxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/sched/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3008,7 +3008,8 @@ static noinline void __schedule_bug(stru static inline void schedule_debug(struct task_struct *prev) { #ifdef CONFIG_SCHED_STACK_END_CHECK - BUG_ON(task_stack_end_corrupted(prev)); + if (task_stack_end_corrupted(prev)) + panic("corrupted stack end detected inside scheduler\n"); #endif if (unlikely(in_atomic_preempt_off())) { Patches currently in stable-queue which might be from jannh@xxxxxxxxxx are queue-4.4/ecryptfs-forbid-opening-files-without-mmap-handler.patch queue-4.4/sched-panic-on-corrupted-stack-end.patch queue-4.4/proc-prevent-stacking-filesystems-on-top.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html