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From: Walter Wu <walter-zh.wu@mediatek.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	wsd_upstream <wsd_upstream@mediatek.com>,
	<linux-mediatek@lists.infradead.org>,
	Walter Wu <walter-zh.wu@mediatek.com>
Subject: [PATCH 3/5] lib/test_kasan.c: add timer test case
Date: Mon, 10 Aug 2020 15:26:20 +0800	[thread overview]
Message-ID: <20200810072620.747-1-walter-zh.wu@mediatek.com> (raw)

Adds a test case to verify timer stack recording
and print the last timer stack in KASAN report.

The KASAN report was as follows(cleaned up slightly):

 BUG: KASAN: use-after-free in kasan_timer_uaf

 Freed by task 0:
  kasan_save_stack+0x24/0x50
  kasan_set_track+0x24/0x38
  kasan_set_free_info+0x20/0x40
  __kasan_slab_free+0x10c/0x170
  kasan_slab_free+0x10/0x18
  kfree+0x98/0x270
  kasan_timer_function+0x1c/0x28

 Last timer stack:
  kasan_save_stack+0x24/0x50
  kasan_record_tmr_stack+0xa8/0xb8
  init_timer_key+0xf0/0x248
  kasan_timer_uaf+0x5c/0xd8

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
---
 lib/test_kasan.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 6e5fb05d42d8..2bd61674c7a3 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -821,6 +821,30 @@ static noinline void __init kasan_rcu_uaf(void)
 	call_rcu(&global_ptr->rcu, kasan_rcu_reclaim);
 }
 
+static noinline void __init kasan_timer_function(struct timer_list *timer)
+{
+	del_timer(timer);
+	kfree(timer);
+}
+
+static noinline void __init kasan_timer_uaf(void)
+{
+	struct timer_list *timer;
+
+	timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
+	if (!timer) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	timer_setup(timer, kasan_timer_function, 0);
+	add_timer(timer);
+	msleep(100);
+
+	pr_info("use-after-free on timer\n");
+	((volatile struct timer_list *)timer)->expires;
+}
+
 static int __init kmalloc_tests_init(void)
 {
 	/*
@@ -869,6 +893,7 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_double_kzfree();
 	vmalloc_oob();
 	kasan_rcu_uaf();
+	kasan_timer_uaf();
 
 	kasan_restore_multi_shot(multishot);
 
-- 
2.18.0

WARNING: multiple messages have this Message-ID (diff)
From: Walter Wu <walter-zh.wu@mediatek.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: Walter Wu <walter-zh.wu@mediatek.com>,
	wsd_upstream <wsd_upstream@mediatek.com>,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org, linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/5] lib/test_kasan.c: add timer test case
Date: Mon, 10 Aug 2020 15:26:20 +0800	[thread overview]
Message-ID: <20200810072620.747-1-walter-zh.wu@mediatek.com> (raw)

Adds a test case to verify timer stack recording
and print the last timer stack in KASAN report.

The KASAN report was as follows(cleaned up slightly):

 BUG: KASAN: use-after-free in kasan_timer_uaf

 Freed by task 0:
  kasan_save_stack+0x24/0x50
  kasan_set_track+0x24/0x38
  kasan_set_free_info+0x20/0x40
  __kasan_slab_free+0x10c/0x170
  kasan_slab_free+0x10/0x18
  kfree+0x98/0x270
  kasan_timer_function+0x1c/0x28

 Last timer stack:
  kasan_save_stack+0x24/0x50
  kasan_record_tmr_stack+0xa8/0xb8
  init_timer_key+0xf0/0x248
  kasan_timer_uaf+0x5c/0xd8

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
---
 lib/test_kasan.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 6e5fb05d42d8..2bd61674c7a3 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -821,6 +821,30 @@ static noinline void __init kasan_rcu_uaf(void)
 	call_rcu(&global_ptr->rcu, kasan_rcu_reclaim);
 }
 
+static noinline void __init kasan_timer_function(struct timer_list *timer)
+{
+	del_timer(timer);
+	kfree(timer);
+}
+
+static noinline void __init kasan_timer_uaf(void)
+{
+	struct timer_list *timer;
+
+	timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
+	if (!timer) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	timer_setup(timer, kasan_timer_function, 0);
+	add_timer(timer);
+	msleep(100);
+
+	pr_info("use-after-free on timer\n");
+	((volatile struct timer_list *)timer)->expires;
+}
+
 static int __init kmalloc_tests_init(void)
 {
 	/*
@@ -869,6 +893,7 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_double_kzfree();
 	vmalloc_oob();
 	kasan_rcu_uaf();
+	kasan_timer_uaf();
 
 	kasan_restore_multi_shot(multishot);
 
-- 
2.18.0
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

WARNING: multiple messages have this Message-ID (diff)
From: Walter Wu <walter-zh.wu@mediatek.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: Walter Wu <walter-zh.wu@mediatek.com>,
	wsd_upstream <wsd_upstream@mediatek.com>,
	linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linux-mm@kvack.org, linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/5] lib/test_kasan.c: add timer test case
Date: Mon, 10 Aug 2020 15:26:20 +0800	[thread overview]
Message-ID: <20200810072620.747-1-walter-zh.wu@mediatek.com> (raw)

Adds a test case to verify timer stack recording
and print the last timer stack in KASAN report.

The KASAN report was as follows(cleaned up slightly):

 BUG: KASAN: use-after-free in kasan_timer_uaf

 Freed by task 0:
  kasan_save_stack+0x24/0x50
  kasan_set_track+0x24/0x38
  kasan_set_free_info+0x20/0x40
  __kasan_slab_free+0x10c/0x170
  kasan_slab_free+0x10/0x18
  kfree+0x98/0x270
  kasan_timer_function+0x1c/0x28

 Last timer stack:
  kasan_save_stack+0x24/0x50
  kasan_record_tmr_stack+0xa8/0xb8
  init_timer_key+0xf0/0x248
  kasan_timer_uaf+0x5c/0xd8

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
---
 lib/test_kasan.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 6e5fb05d42d8..2bd61674c7a3 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -821,6 +821,30 @@ static noinline void __init kasan_rcu_uaf(void)
 	call_rcu(&global_ptr->rcu, kasan_rcu_reclaim);
 }
 
+static noinline void __init kasan_timer_function(struct timer_list *timer)
+{
+	del_timer(timer);
+	kfree(timer);
+}
+
+static noinline void __init kasan_timer_uaf(void)
+{
+	struct timer_list *timer;
+
+	timer = kmalloc(sizeof(struct timer_list), GFP_KERNEL);
+	if (!timer) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	timer_setup(timer, kasan_timer_function, 0);
+	add_timer(timer);
+	msleep(100);
+
+	pr_info("use-after-free on timer\n");
+	((volatile struct timer_list *)timer)->expires;
+}
+
 static int __init kmalloc_tests_init(void)
 {
 	/*
@@ -869,6 +893,7 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_double_kzfree();
 	vmalloc_oob();
 	kasan_rcu_uaf();
+	kasan_timer_uaf();
 
 	kasan_restore_multi_shot(multishot);
 
-- 
2.18.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-08-10  7:26 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-10  7:26 Walter Wu [this message]
2020-08-10  7:26 ` [PATCH 3/5] lib/test_kasan.c: add timer test case Walter Wu
2020-08-10  7:26 ` Walter Wu

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