This is a note to let you know that I've just added the patch titled
uprobes: Fix utask->depth accounting in handle_trampoline()
to the 3.11-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:
uprobes-fix-utask-depth-accounting-in-handle_trampoline.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 878b5a6efd38030c7a90895dc8346e8fb1e09b4c Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Wed, 11 Sep 2013 17:47:26 +0200
Subject: uprobes: Fix utask->depth accounting in handle_trampoline()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit 878b5a6efd38030c7a90895dc8346e8fb1e09b4c upstream.
Currently utask->depth is simply the number of allocated/pending
return_instance's in uprobe_task->return_instances list.
handle_trampoline() should decrement this counter every time we
handle/free an instance, but due to typo it does this only if
->chained == T. This means that in the likely case this counter
is never decremented and the probed task can't report more than
MAX_URETPROBE_DEPTH events.
Reported-by: Mikhail Kulemin <Mikhail.Kulemin@xxxxxxxxxx>
Reported-by: Hemant Kumar Shaw <hkshaw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Anton Arapov <anton@xxxxxxxxxx>
Cc: masami.hiramatsu.pt@xxxxxxxxxxx
Cc: srikar@xxxxxxxxxxxxxxxxxx
Cc: systemtap@xxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20130911154726.GA8093@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/events/uprobes.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1682,12 +1682,10 @@ static bool handle_trampoline(struct pt_
tmp = ri;
ri = ri->next;
kfree(tmp);
+ utask->depth--;
if (!chained)
break;
-
- utask->depth--;
-
BUG_ON(!ri);
}
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.11/uprobes-fix-utask-depth-accounting-in-handle_trampoline.patch
queue-3.11/tty-disassociate_ctty-sends-the-extra-sigcont.patch
queue-3.11/pidns-fix-vfork-after-unshare-clone_newpid.patch
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