1 files changed, 277 insertions, 0 deletions

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
new file mode 100644
index 000000000000..098c08eddfab
--- /dev/null
+++ b/lib/test_kasan.c
@@ -0,0 +1,277 @@
+/*
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/module.h>
+
+static noinline void __init kmalloc_oob_right(void)
+{
+        char *ptr;
+        size_t size = 123;
+
+        pr_info("out-of-bounds to right\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        ptr[size] = 'x';
+        kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_left(void)
+{
+        char *ptr;
+        size_t size = 15;
+
+        pr_info("out-of-bounds to left\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        *ptr = *(ptr - 1);
+        kfree(ptr);
+}
+
+static noinline void __init kmalloc_node_oob_right(void)
+{
+        char *ptr;
+        size_t size = 4096;
+
+        pr_info("kmalloc_node(): out-of-bounds to right\n");
+        ptr = kmalloc_node(size, GFP_KERNEL, 0);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        ptr[size] = 0;
+        kfree(ptr);
+}
+
+static noinline void __init kmalloc_large_oob_rigth(void)
+{
+        char *ptr;
+        size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+        pr_info("kmalloc large allocation: out-of-bounds to right\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        ptr[size] = 0;
+        kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_krealloc_more(void)
+{
+        char *ptr1, *ptr2;
+        size_t size1 = 17;
+        size_t size2 = 19;
+
+        pr_info("out-of-bounds after krealloc more\n");
+        ptr1 = kmalloc(size1, GFP_KERNEL);
+        ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
+        if (!ptr1 || !ptr2) {
+                pr_err("Allocation failed\n");
+                kfree(ptr1);
+                return;
+        }
+
+        ptr2[size2] = 'x';
+        kfree(ptr2);
+}
+
+static noinline void __init kmalloc_oob_krealloc_less(void)
+{
+        char *ptr1, *ptr2;
+        size_t size1 = 17;
+        size_t size2 = 15;
+
+        pr_info("out-of-bounds after krealloc less\n");
+        ptr1 = kmalloc(size1, GFP_KERNEL);
+        ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
+        if (!ptr1 || !ptr2) {
+                pr_err("Allocation failed\n");
+                kfree(ptr1);
+                return;
+        }
+        ptr2[size1] = 'x';
+        kfree(ptr2);
+}
+
+static noinline void __init kmalloc_oob_16(void)
+{
+        struct {
+                u64 words[2];
+        } *ptr1, *ptr2;
+
+        pr_info("kmalloc out-of-bounds for 16-bytes access\n");
+        ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
+        ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
+        if (!ptr1 || !ptr2) {
+                pr_err("Allocation failed\n");
+                kfree(ptr1);
+                kfree(ptr2);
+                return;
+        }
+        *ptr1 = *ptr2;
+        kfree(ptr1);
+        kfree(ptr2);
+}
+
+static noinline void __init kmalloc_oob_in_memset(void)
+{
+        char *ptr;
+        size_t size = 666;
+
+        pr_info("out-of-bounds in memset\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        memset(ptr, 0, size+5);
+        kfree(ptr);
+}
+
+static noinline void __init kmalloc_uaf(void)
+{
+        char *ptr;
+        size_t size = 10;
+
+        pr_info("use-after-free\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        kfree(ptr);
+        *(ptr + 8) = 'x';
+}
+
+static noinline void __init kmalloc_uaf_memset(void)
+{
+        char *ptr;
+        size_t size = 33;
+
+        pr_info("use-after-free in memset\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        kfree(ptr);
+        memset(ptr, 0, size);
+}
+
+static noinline void __init kmalloc_uaf2(void)
+{
+        char *ptr1, *ptr2;
+        size_t size = 43;
+
+        pr_info("use-after-free after another kmalloc\n");
+        ptr1 = kmalloc(size, GFP_KERNEL);
+        if (!ptr1) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        kfree(ptr1);
+        ptr2 = kmalloc(size, GFP_KERNEL);
+        if (!ptr2) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        ptr1[40] = 'x';
+        kfree(ptr2);
+}
+
+static noinline void __init kmem_cache_oob(void)
+{
+        char *p;
+        size_t size = 200;
+        struct kmem_cache *cache = kmem_cache_create("test_cache",
+                                                size, 0,
+                                                0, NULL);
+        if (!cache) {
+                pr_err("Cache allocation failed\n");
+                return;
+        }
+        pr_info("out-of-bounds in kmem_cache_alloc\n");
+        p = kmem_cache_alloc(cache, GFP_KERNEL);
+        if (!p) {
+                pr_err("Allocation failed\n");
+                kmem_cache_destroy(cache);
+                return;
+        }
+
+        *p = p[size];
+        kmem_cache_free(cache, p);
+        kmem_cache_destroy(cache);
+}
+
+static char global_array[10];
+
+static noinline void __init kasan_global_oob(void)
+{
+        volatile int i = 3;
+        char *p = &global_array[ARRAY_SIZE(global_array) + i];
+
+        pr_info("out-of-bounds global variable\n");
+        *(volatile char *)p;
+}
+
+static noinline void __init kasan_stack_oob(void)
+{
+        char stack_array[10];
+        volatile int i = 0;
+        char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
+
+        pr_info("out-of-bounds on stack\n");
+        *(volatile char *)p;
+}
+
+static int __init kmalloc_tests_init(void)
+{
+        kmalloc_oob_right();
+        kmalloc_oob_left();
+        kmalloc_node_oob_right();
+        kmalloc_large_oob_rigth();
+        kmalloc_oob_krealloc_more();
+        kmalloc_oob_krealloc_less();
+        kmalloc_oob_16();
+        kmalloc_oob_in_memset();
+        kmalloc_uaf();
+        kmalloc_uaf_memset();
+        kmalloc_uaf2();
+        kmem_cache_oob();
+        kasan_stack_oob();
+        kasan_global_oob();
+        return -EAGAIN;
+}
+
+module_init(kmalloc_tests_init);
+MODULE_LICENSE("GPL");