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authorAndrey Konovalov <andreyknvl@google.com>2022-09-06 00:18:36 +0200
committerAndrew Morton <akpm@linux-foundation.org>2022-10-03 14:03:02 -0700
commitf7e01ab828fd4bf6d25b1f143a3994241e8572bf (patch)
treec7103881feb9c8aaf9d7996d918007cdaed8e737 /lib/test_kasan_module.c
parent34b592ce5cc2dbd7d94812bff12ec32d3ec6f65c (diff)
downloadlinux-f7e01ab828fd4bf6d25b1f143a3994241e8572bf.tar.gz
kasan: move tests to mm/kasan/
Move KASAN tests to mm/kasan/ to keep the test code alongside the implementation. Link: https://lkml.kernel.org/r/676398f0aeecd47d2f8e3369ea0e95563f641a36.1662416260.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/test_kasan_module.c')
-rw-r--r--lib/test_kasan_module.c141
1 files changed, 0 insertions, 141 deletions
diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c
deleted file mode 100644
index b112cbc835e9..000000000000
--- a/lib/test_kasan_module.c
+++ /dev/null
@@ -1,141 +0,0 @@
-// 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"
-
-static noinline void __init copy_user_test(void)
-{
- char *kmem;
- char __user *usermem;
- size_t size = 128 - KASAN_GRANULE_SIZE;
- int __maybe_unused 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\n");
- kfree(kmem);
- return;
- }
-
- OPTIMIZER_HIDE_VAR(size);
-
- pr_info("out-of-bounds in copy_from_user()\n");
- unused = copy_from_user(kmem, usermem, size + 1);
-
- pr_info("out-of-bounds in copy_to_user()\n");
- unused = copy_to_user(usermem, kmem, size + 1);
-
- pr_info("out-of-bounds in __copy_from_user()\n");
- unused = __copy_from_user(kmem, usermem, size + 1);
-
- pr_info("out-of-bounds in __copy_to_user()\n");
- unused = __copy_to_user(usermem, kmem, size + 1);
-
- pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
- unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
-
- pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
- unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
-
- pr_info("out-of-bounds in strncpy_from_user()\n");
- unused = strncpy_from_user(kmem, usermem, size + 1);
-
- 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);
- ((volatile struct kasan_rcu_info *)fp)->i;
-}
-
-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 noinline void __init kasan_workqueue_work(struct work_struct *work)
-{
- kfree(work);
-}
-
-static noinline void __init kasan_workqueue_uaf(void)
-{
- struct workqueue_struct *workqueue;
- struct work_struct *work;
-
- workqueue = create_workqueue("kasan_wq_test");
- if (!workqueue) {
- pr_err("Allocation failed\n");
- return;
- }
- work = kmalloc(sizeof(struct work_struct), GFP_KERNEL);
- if (!work) {
- pr_err("Allocation failed\n");
- return;
- }
-
- INIT_WORK(work, kasan_workqueue_work);
- queue_work(workqueue, work);
- destroy_workqueue(workqueue);
-
- pr_info("use-after-free on workqueue\n");
- ((volatile struct work_struct *)work)->data;
-}
-
-static int __init test_kasan_module_init(void)
-{
- /*
- * Temporarily enable multi-shot mode. Otherwise, KASAN would only
- * report the first detected bug and panic the kernel if panic_on_warn
- * is enabled.
- */
- bool multishot = kasan_save_enable_multi_shot();
-
- copy_user_test();
- kasan_rcu_uaf();
- kasan_workqueue_uaf();
-
- kasan_restore_multi_shot(multishot);
- return -EAGAIN;
-}
-
-module_init(test_kasan_module_init);
-MODULE_LICENSE("GPL");