^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2014 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "../mm/kasan/kasan.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static noinline void __init copy_user_test(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) char *kmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) char __user *usermem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) size_t size = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int unused;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) kmem = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (!kmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) PROT_READ | PROT_WRITE | PROT_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) MAP_ANONYMOUS | MAP_PRIVATE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) if (IS_ERR(usermem)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) pr_err("Failed to allocate user memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) kfree(kmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) pr_info("out-of-bounds in copy_from_user()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) pr_info("out-of-bounds in copy_to_user()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pr_info("out-of-bounds in __copy_from_user()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pr_info("out-of-bounds in __copy_to_user()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) pr_info("out-of-bounds in strncpy_from_user()\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) vm_munmap((unsigned long)usermem, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) kfree(kmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static struct kasan_rcu_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } *global_rcu_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct kasan_rcu_info *fp = container_of(rp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct kasan_rcu_info, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) kfree(fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) fp->i = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static noinline void __init kasan_rcu_uaf(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct kasan_rcu_info *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) pr_info("use-after-free in kasan_rcu_reclaim\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (!ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pr_err("Allocation failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) global_rcu_ptr = rcu_dereference_protected(ptr, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static noinline void __init kasan_workqueue_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) kfree(work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static noinline void __init kasan_workqueue_uaf(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct workqueue_struct *workqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct work_struct *work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) workqueue = create_workqueue("kasan_wq_test");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (!workqueue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) pr_err("Allocation failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!work) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) pr_err("Allocation failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) INIT_WORK(work, kasan_workqueue_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) queue_work(workqueue, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) destroy_workqueue(workqueue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) pr_info("use-after-free on workqueue\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ((volatile struct work_struct *)work)->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int __init test_kasan_module_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Temporarily enable multi-shot mode. Otherwise, KASAN would only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * report the first detected bug and panic the kernel if panic_on_warn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * is enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) bool multishot = kasan_save_enable_multi_shot();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) copy_user_test();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) kasan_rcu_uaf();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) kasan_workqueue_uaf();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) kasan_restore_multi_shot(multishot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) module_init(test_kasan_module_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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