Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 629 insertions, 0 deletions

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
new file mode 100644
index 000000000..bd0e067c4
--- /dev/null
+++ b/lib/test_kasan.c
@@ -0,0 +1,629 @@
+/*
+ *
+ * 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/delay.h>
+#include <linux/kernel.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/kasan.h>
+
+/*
+ * Note: test functions are marked noinline so that their names appear in
+ * reports.
+ */
+
+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);
+}
+
+#ifdef CONFIG_SLUB
+static noinline void __init kmalloc_pagealloc_oob_right(void)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+	/* Allocate a chunk that does not fit into a SLUB cache to trigger
+	 * the page allocator fallback.
+	 */
+	pr_info("kmalloc pagealloc 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_pagealloc_uaf(void)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+	pr_info("kmalloc pagealloc allocation: use-after-free\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	kfree(ptr);
+	ptr[0] = 0;
+}
+
+static noinline void __init kmalloc_pagealloc_invalid_free(void)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+	pr_info("kmalloc pagealloc allocation: invalid-free\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	kfree(ptr + 1);
+}
+#endif
+
+static noinline void __init kmalloc_large_oob_right(void)
+{
+	char *ptr;
+	size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
+	/* Allocate a chunk that is large enough, but still fits into a slab
+	 * and does not trigger the page allocator fallback in SLUB.
+	 */
+	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);
+		kfree(ptr2);
+		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[size2] = '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_memset_2(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset2\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+7, 0, 2);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_4(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset4\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+5, 0, 4);
+	kfree(ptr);
+}
+
+
+static noinline void __init kmalloc_oob_memset_8(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset8\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 8);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_16(void)
+{
+	char *ptr;
+	size_t size = 16;
+
+	pr_info("out-of-bounds in memset16\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 16);
+	kfree(ptr);
+}
+
+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';
+	if (ptr1 == ptr2)
+		pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
+	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 noinline void __init memcg_accounted_kmem_cache(void)
+{
+	int i;
+	char *p;
+	size_t size = 200;
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
+	if (!cache) {
+		pr_err("Cache allocation failed\n");
+		return;
+	}
+
+	pr_info("allocate memcg accounted object\n");
+	/*
+	 * Several allocations with a delay to allow for lazy per memcg kmem
+	 * cache creation.
+	 */
+	for (i = 0; i < 5; i++) {
+		p = kmem_cache_alloc(cache, GFP_KERNEL);
+		if (!p)
+			goto free_cache;
+
+		kmem_cache_free(cache, p);
+		msleep(100);
+	}
+
+free_cache:
+	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 noinline void __init ksize_unpoisons_memory(void)
+{
+	char *ptr;
+	size_t size = 123, real_size;
+
+	pr_info("ksize() unpoisons the whole allocated chunk\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+	real_size = ksize(ptr);
+	/* This access doesn't trigger an error. */
+	ptr[size] = 'x';
+	/* This one does. */
+	ptr[real_size] = 'y';
+	kfree(ptr);
+}
+
+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\n");
+		kfree(kmem);
+		return;
+	}
+
+	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 noinline void __init use_after_scope_test(void)
+{
+	volatile char *volatile p;
+
+	pr_info("use-after-scope on int\n");
+	{
+		int local = 0;
+
+		p = (char *)&local;
+	}
+	p[0] = 1;
+	p[3] = 1;
+
+	pr_info("use-after-scope on array\n");
+	{
+		char local[1024] = {0};
+
+		p = local;
+	}
+	p[0] = 1;
+	p[1023] = 1;
+}
+
+static noinline void __init kasan_alloca_oob_left(void)
+{
+	volatile int i = 10;
+	char alloca_array[i];
+	char *p = alloca_array - 1;
+
+	pr_info("out-of-bounds to left on alloca\n");
+	*(volatile char *)p;
+}
+
+static noinline void __init kasan_alloca_oob_right(void)
+{
+	volatile int i = 10;
+	char alloca_array[i];
+	char *p = alloca_array + i;
+
+	pr_info("out-of-bounds to right on alloca\n");
+	*(volatile char *)p;
+}
+
+static noinline void __init kmem_cache_double_free(void)
+{
+	char *p;
+	size_t size = 200;
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
+	if (!cache) {
+		pr_err("Cache allocation failed\n");
+		return;
+	}
+	pr_info("double-free on heap object\n");
+	p = kmem_cache_alloc(cache, GFP_KERNEL);
+	if (!p) {
+		pr_err("Allocation failed\n");
+		kmem_cache_destroy(cache);
+		return;
+	}
+
+	kmem_cache_free(cache, p);
+	kmem_cache_free(cache, p);
+	kmem_cache_destroy(cache);
+}
+
+static noinline void __init kmem_cache_invalid_free(void)
+{
+	char *p;
+	size_t size = 200;
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
+				  NULL);
+	if (!cache) {
+		pr_err("Cache allocation failed\n");
+		return;
+	}
+	pr_info("invalid-free of heap object\n");
+	p = kmem_cache_alloc(cache, GFP_KERNEL);
+	if (!p) {
+		pr_err("Allocation failed\n");
+		kmem_cache_destroy(cache);
+		return;
+	}
+
+	/* Trigger invalid free, the object doesn't get freed */
+	kmem_cache_free(cache, p + 1);
+
+	/*
+	 * Properly free the object to prevent the "Objects remaining in
+	 * test_cache on __kmem_cache_shutdown" BUG failure.
+	 */
+	kmem_cache_free(cache, p);
+
+	kmem_cache_destroy(cache);
+}
+
+static int __init kmalloc_tests_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();
+
+	kmalloc_oob_right();
+	kmalloc_oob_left();
+	kmalloc_node_oob_right();
+#ifdef CONFIG_SLUB
+	kmalloc_pagealloc_oob_right();
+	kmalloc_pagealloc_uaf();
+	kmalloc_pagealloc_invalid_free();
+#endif
+	kmalloc_large_oob_right();
+	kmalloc_oob_krealloc_more();
+	kmalloc_oob_krealloc_less();
+	kmalloc_oob_16();
+	kmalloc_oob_in_memset();
+	kmalloc_oob_memset_2();
+	kmalloc_oob_memset_4();
+	kmalloc_oob_memset_8();
+	kmalloc_oob_memset_16();
+	kmalloc_uaf();
+	kmalloc_uaf_memset();
+	kmalloc_uaf2();
+	kmem_cache_oob();
+	memcg_accounted_kmem_cache();
+	kasan_stack_oob();
+	kasan_global_oob();
+	kasan_alloca_oob_left();
+	kasan_alloca_oob_right();
+	ksize_unpoisons_memory();
+	copy_user_test();
+	use_after_scope_test();
+	kmem_cache_double_free();
+	kmem_cache_invalid_free();
+
+	kasan_restore_multi_shot(multishot);
+
+	return -EAGAIN;
+}
+
+module_init(kmalloc_tests_init);
+MODULE_LICENSE("GPL");