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kasan: add tests for call_rcu stack recording

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Test call_rcu() call stack recording and verify whether it correctly is
printed in KASAN report.

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Link: http://lkml.kernel.org/r/20200601051045.1294-1-walter-zh.wu@mediatek.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Walter Wu
2020-08-06 23:24:42 -07:00
committed by Linus Torvalds
parent e4b7818b9a
commit 387d6e4668
1 changed files with 30 additions and 0 deletions
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30
lib/test_kasan.c
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@@ -801,6 +801,35 @@ static noinline void __init vmalloc_oob(void)
static void __init vmalloc_oob(void) {} static void __init vmalloc_oob(void) {}
#endif #endif
static struct kasan_rcu_info {
int i;
struct rcu_head rcu;
} *global_rcu_ptr;
static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp)
{
struct kasan_rcu_info *fp = container_of(rp,
struct kasan_rcu_info, rcu);
kfree(fp);
fp->i = 1;
}
static noinline void __init kasan_rcu_uaf(void)
{
struct kasan_rcu_info *ptr;
pr_info("use-after-free in kasan_rcu_reclaim\n");
ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
if (!ptr) {
pr_err("Allocation failed\n");
return;
}
global_rcu_ptr = rcu_dereference_protected(ptr, NULL);
call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
}
static int __init kmalloc_tests_init(void) static int __init kmalloc_tests_init(void)
{ {
/* /*
@@ -848,6 +877,7 @@ static int __init kmalloc_tests_init(void)
kasan_bitops(); kasan_bitops();
kmalloc_double_kzfree(); kmalloc_double_kzfree();
vmalloc_oob(); vmalloc_oob();
kasan_rcu_uaf();
kasan_restore_multi_shot(multishot); kasan_restore_multi_shot(multishot);