From: Zqiang <qiang.zhang@windriver.com>
Date: Fri, 20 Nov 2020 14:53:11 +0000 (-0800)
Subject: rcu: Record kvfree_call_rcu() call stack for KASAN
X-Git-Tag: accepted/tizen/unified/20230118.172025~7851^2~1^2^3~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=84109ab58590dc6c4e7eb36329fdc7ec121ed5a5;p=platform%2Fkernel%2Flinux-rpi.git

rcu: Record kvfree_call_rcu() call stack for KASAN

This commit adds a call to kasan_record_aux_stack() in kvfree_call_rcu()
in order to record the call stack of the code that caused the object
to be freed.  Please note that this function does not update the
allocated/freed state, which is important because RCU readers might
still be referencing this object.

Acked-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 40e5e3d..2db736c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3498,6 +3498,7 @@ void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
 		goto unlock_return;
 	}
 
+	kasan_record_aux_stack(ptr);
 	success = kvfree_call_rcu_add_ptr_to_bulk(krcp, ptr);
 	if (!success) {
 		run_page_cache_worker(krcp);