The patch titled
Subject: kasan: add tests for call_rcu stack recording
has been added to the -mm tree. Its filename is
kasan-add-tests-for-call_rcu-stack-recording.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-add-tests-for-call_rcu-stack-recording.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-add-tests-for-call_rcu-stack-recording.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Subject: kasan: add tests for call_rcu stack recording
Test call_rcu() call stack recording and verify whether it correctly is
printed in KASAN report.
Link: http://lkml.kernel.org/r/20200601051045.1294-1-walter-zh.wu@xxxxxxxxxxxx
Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Tested-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: "Paul E . McKenney" <paulmck@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_kasan.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--- a/lib/test_kasan.c~kasan-add-tests-for-call_rcu-stack-recording
+++ a/lib/test_kasan.c
@@ -801,6 +801,35 @@ static noinline void __init vmalloc_oob(
static void __init vmalloc_oob(void) {}
#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)
{
/*
@@ -848,6 +877,7 @@ static int __init kmalloc_tests_init(voi
kasan_bitops();
kmalloc_double_kzfree();
vmalloc_oob();
+ kasan_rcu_uaf();
kasan_restore_multi_shot(multishot);
_
Patches currently in -mm which might be from walter-zh.wu@xxxxxxxxxxxx are
rcu-kasan-record-and-print-call_rcu-call-stack.patch
kasan-record-and-print-the-free-track.patch
kasan-add-tests-for-call_rcu-stack-recording.patch
kasan-update-documentation-for-generic-kasan.patch
