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authorPaul E. McKenney <paulmck@kernel.org>2020-12-03 04:52:07 +0300
committerPaul E. McKenney <paulmck@kernel.org>2021-01-07 04:17:21 +0300
commitedf7b8417834c89d00ef88355ea507b0b0a630ae (patch)
tree97368f70d1f1dc38c0f86dad65871ad0c903a83f /kernel/rcu
parent8a67a20bf257ca378d6e5588fbe4382966395ac8 (diff)
downloadlinux-edf7b8417834c89d00ef88355ea507b0b0a630ae.tar.xz
rcutorture: Make object_debug also double call_rcu() heap object
This commit provides a test for call_rcu() printing the allocation address of a double-freed callback by double-freeing a callback allocated via kmalloc(). However, this commit does not depend on any other commit. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/rcutorture.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 007595d4783f..76c838696366 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2782,6 +2782,7 @@ static void rcu_test_debug_objects(void)
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
struct rcu_head rh1;
struct rcu_head rh2;
+ struct rcu_head *rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
init_rcu_head_on_stack(&rh1);
init_rcu_head_on_stack(&rh2);
@@ -2794,6 +2795,10 @@ static void rcu_test_debug_objects(void)
local_irq_disable(); /* Make it harder to start a new grace period. */
call_rcu(&rh2, rcu_torture_leak_cb);
call_rcu(&rh2, rcu_torture_err_cb); /* Duplicate callback. */
+ if (rhp) {
+ call_rcu(rhp, rcu_torture_leak_cb);
+ call_rcu(rhp, rcu_torture_err_cb); /* Another duplicate callback. */
+ }
local_irq_enable();
rcu_read_unlock();
preempt_enable();