Eric Lee / smarc-fsl-linux-kernel

Blame view

lib/test_kasan_module.c 2.7 KB
edit raw normal view history
73228c7ec   Patricia Alfonso   KASAN: port KASAN... 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
 
  // SPDX-License-Identifier: GPL-2.0-only
  /*
   *
   * Copyright (c) 2014 Samsung Electronics Co., Ltd.
   * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
   */
  
  #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
  
  #include <linux/mman.h>
  #include <linux/module.h>
  #include <linux/printk.h>
  #include <linux/slab.h>
  #include <linux/uaccess.h>
  
  #include "../mm/kasan/kasan.h"
  
  #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)
  
  static noinline void __init copy_user_test(void)
  {
  	char *kmem;
  	char __user *usermem;
  	size_t size = 10;
  	int unused;
  
  	kmem = kmalloc(size, GFP_KERNEL);
  	if (!kmem)
  		return;
  
  	usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
  			    PROT_READ | PROT_WRITE | PROT_EXEC,
  			    MAP_ANONYMOUS | MAP_PRIVATE, 0);
  	if (IS_ERR(usermem)) {
  		pr_err("Failed to allocate user memory
  ");
  		kfree(kmem);
  		return;
  	}
  
  	pr_info("out-of-bounds in copy_from_user()
  ");
  	unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in copy_to_user()
  ");
  	unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in __copy_from_user()
  ");
  	unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in __copy_to_user()
  ");
  	unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in __copy_from_user_inatomic()
  ");
  	unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in __copy_to_user_inatomic()
  ");
  	unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF);
  
  	pr_info("out-of-bounds in strncpy_from_user()
  ");
  	unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
  
  	vm_munmap((unsigned long)usermem, PAGE_SIZE);
  	kfree(kmem);
  }
  
  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
  ");
  	ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
  	if (!ptr) {
  		pr_err("Allocation failed
  ");
  		return;
  	}
  
  	global_rcu_ptr = rcu_dereference_protected(ptr, NULL);
  	call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
  }
  
  
  static int __init test_kasan_module_init(void)
  {
  	/*
  	 * Temporarily enable multi-shot mode. Otherwise, we'd only get a
  	 * report for the first case.
  	 */
  	bool multishot = kasan_save_enable_multi_shot();
  
  	copy_user_test();
  	kasan_rcu_uaf();
  
  	kasan_restore_multi_shot(multishot);
  	return -EAGAIN;
  }
  
  module_init(test_kasan_module_init);
  MODULE_LICENSE("GPL");