From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/lib/test_kasan.c | 1164 ++++++++++++++++++++++++++++++++++++++++-----------------
1 files changed, 815 insertions(+), 349 deletions(-)
diff --git a/kernel/lib/test_kasan.c b/kernel/lib/test_kasan.c
index d86d3b1..87170a6 100644
--- a/kernel/lib/test_kasan.c
+++ b/kernel/lib/test_kasan.c
@@ -1,371 +1,601 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
*
* 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/bitops.h>
#include <linux/delay.h>
+#include <linux/kasan.h>
#include <linux/kernel.h>
-#include <linux/mman.h>
#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/module.h>
#include <linux/printk.h>
+#include <linux/random.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
-#include <linux/module.h>
-#include <linux/kasan.h>
+#include <linux/io.h>
+#include <linux/vmalloc.h>
+
+#include <asm/page.h>
+
+#include <kunit/test.h>
+
+#include "../mm/kasan/kasan.h"
+
+#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
/*
- * Note: test functions are marked noinline so that their names appear in
- * reports.
+ * Some tests use these global variables to store return values from function
+ * calls that could otherwise be eliminated by the compiler as dead code.
*/
+void *kasan_ptr_result;
+int kasan_int_result;
-static noinline void __init kmalloc_oob_right(void)
+static struct kunit_resource resource;
+static struct kunit_kasan_expectation fail_data;
+static bool multishot;
+
+/*
+ * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the
+ * first detected bug and panic the kernel if panic_on_warn is enabled. For
+ * hardware tag-based KASAN also allow tag checking to be reenabled for each
+ * test, see the comment for KUNIT_EXPECT_KASAN_FAIL().
+ */
+static int kasan_test_init(struct kunit *test)
+{
+ if (!kasan_enabled()) {
+ kunit_err(test, "can't run KASAN tests with KASAN disabled");
+ return -1;
+ }
+
+ multishot = kasan_save_enable_multi_shot();
+ kasan_set_tagging_report_once(false);
+ return 0;
+}
+
+static void kasan_test_exit(struct kunit *test)
+{
+ kasan_set_tagging_report_once(true);
+ kasan_restore_multi_shot(multishot);
+}
+
+/**
+ * KUNIT_EXPECT_KASAN_FAIL() - check that the executed expression produces a
+ * KASAN report; causes a test failure otherwise. This relies on a KUnit
+ * resource named "kasan_data". Do not use this name for KUnit resources
+ * outside of KASAN tests.
+ *
+ * For hardware tag-based KASAN in sync mode, when a tag fault happens, tag
+ * checking is auto-disabled. When this happens, this test handler reenables
+ * tag checking. As tag checking can be only disabled or enabled per CPU,
+ * this handler disables migration (preemption).
+ *
+ * Since the compiler doesn't see that the expression can change the fail_data
+ * fields, it can reorder or optimize away the accesses to those fields.
+ * Use READ/WRITE_ONCE() for the accesses and compiler barriers around the
+ * expression to prevent that.
+ */
+#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \
+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
+ !kasan_async_mode_enabled()) \
+ migrate_disable(); \
+ WRITE_ONCE(fail_data.report_expected, true); \
+ WRITE_ONCE(fail_data.report_found, false); \
+ kunit_add_named_resource(test, \
+ NULL, \
+ NULL, \
+ &resource, \
+ "kasan_data", &fail_data); \
+ barrier(); \
+ expression; \
+ barrier(); \
+ if (kasan_async_mode_enabled()) \
+ kasan_force_async_fault(); \
+ barrier(); \
+ KUNIT_EXPECT_EQ(test, \
+ READ_ONCE(fail_data.report_expected), \
+ READ_ONCE(fail_data.report_found)); \
+ if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
+ !kasan_async_mode_enabled()) { \
+ if (READ_ONCE(fail_data.report_found)) \
+ kasan_enable_tagging_sync(); \
+ migrate_enable(); \
+ } \
+} while (0)
+
+#define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \
+ if (!IS_ENABLED(config)) { \
+ kunit_info((test), "skipping, " #config " required"); \
+ return; \
+ } \
+} while (0)
+
+#define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \
+ if (IS_ENABLED(config)) { \
+ kunit_info((test), "skipping, " #config " enabled"); \
+ return; \
+ } \
+} while (0)
+
+static void kmalloc_oob_right(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- ptr[size] = 'x';
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x');
kfree(ptr);
}
-static noinline void __init kmalloc_oob_left(void)
+static void kmalloc_oob_left(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- *ptr = *(ptr - 1);
+ KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1));
kfree(ptr);
}
-static noinline void __init kmalloc_node_oob_right(void)
+static void kmalloc_node_oob_right(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- ptr[size] = 0;
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
kfree(ptr);
}
-#ifdef CONFIG_SLUB
-static noinline void __init kmalloc_pagealloc_oob_right(void)
+/*
+ * These kmalloc_pagealloc_* tests try allocating a memory chunk that doesn't
+ * fit into a slab cache and therefore is allocated via the page allocator
+ * fallback. Since this kind of fallback is only implemented for SLUB, these
+ * tests are limited to that allocator.
+ */
+static void kmalloc_pagealloc_oob_right(struct kunit *test)
{
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.
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0);
+
+ kfree(ptr);
+}
+
+static void kmalloc_pagealloc_uaf(struct kunit *test)
+{
+ char *ptr;
+ size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ kfree(ptr);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0);
+}
+
+static void kmalloc_pagealloc_invalid_free(struct kunit *test)
+{
+ char *ptr;
+ size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1));
+}
+
+static void pagealloc_oob_right(struct kunit *test)
+{
+ char *ptr;
+ struct page *pages;
+ size_t order = 4;
+ size_t size = (1UL << (PAGE_SHIFT + order));
+
+ /*
+ * With generic KASAN page allocations have no redzones, thus
+ * out-of-bounds detection is not guaranteed.
+ * See https://bugzilla.kernel.org/show_bug.cgi?id=210503.
*/
- pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
- ptr = kmalloc(size, GFP_KERNEL);
- if (!ptr) {
- pr_err("Allocation failed\n");
- return;
- }
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
- ptr[size] = 0;
- kfree(ptr);
+ pages = alloc_pages(GFP_KERNEL, order);
+ ptr = page_address(pages);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
+ free_pages((unsigned long)ptr, order);
}
-static noinline void __init kmalloc_pagealloc_uaf(void)
+static void pagealloc_uaf(struct kunit *test)
{
char *ptr;
- size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+ struct page *pages;
+ size_t order = 4;
- pr_info("kmalloc pagealloc allocation: use-after-free\n");
- ptr = kmalloc(size, GFP_KERNEL);
- if (!ptr) {
- pr_err("Allocation failed\n");
- return;
- }
+ pages = alloc_pages(GFP_KERNEL, order);
+ ptr = page_address(pages);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ free_pages((unsigned long)ptr, order);
- kfree(ptr);
- ptr[0] = 0;
+ KUNIT_EXPECT_KASAN_FAIL(test, 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)
+static void kmalloc_large_oob_right(struct kunit *test)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
- /* Allocate a chunk that is large enough, but still fits into a slab
+
+ /*
+ * 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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- ptr[size] = 0;
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
kfree(ptr);
}
-static noinline void __init kmalloc_oob_krealloc_more(void)
+static void krealloc_more_oob_helper(struct kunit *test,
+ size_t size1, size_t size2)
{
char *ptr1, *ptr2;
- size_t size1 = 17;
- size_t size2 = 19;
+ size_t middle;
- pr_info("out-of-bounds after krealloc more\n");
+ KUNIT_ASSERT_LT(test, size1, size2);
+ middle = size1 + (size2 - size1) / 2;
+
ptr1 = kmalloc(size1, GFP_KERNEL);
- ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
- if (!ptr1 || !ptr2) {
- pr_err("Allocation failed\n");
- kfree(ptr1);
- kfree(ptr2);
- return;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
- ptr2[size2] = 'x';
+ ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
+
+ /* All offsets up to size2 must be accessible. */
+ ptr2[size1 - 1] = 'x';
+ ptr2[size1] = 'x';
+ ptr2[middle] = 'x';
+ ptr2[size2 - 1] = 'x';
+
+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
+
+ /* For all modes first aligned offset after size2 must be inaccessible. */
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
+
kfree(ptr2);
}
-static noinline void __init kmalloc_oob_krealloc_less(void)
+static void krealloc_less_oob_helper(struct kunit *test,
+ size_t size1, size_t size2)
{
char *ptr1, *ptr2;
- size_t size1 = 17;
- size_t size2 = 15;
+ size_t middle;
- pr_info("out-of-bounds after krealloc less\n");
+ KUNIT_ASSERT_LT(test, size2, size1);
+ middle = size2 + (size1 - size2) / 2;
+
ptr1 = kmalloc(size1, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
+
ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
- if (!ptr1 || !ptr2) {
- pr_err("Allocation failed\n");
- kfree(ptr1);
- return;
- }
- ptr2[size2] = 'x';
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
+
+ /* Must be accessible for all modes. */
+ ptr2[size2 - 1] = 'x';
+
+ /* Generic mode is precise, so unaligned size2 must be inaccessible. */
+ if (IS_ENABLED(CONFIG_KASAN_GENERIC))
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
+
+ /* For all modes first aligned offset after size2 must be inaccessible. */
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
+
+ /*
+ * For all modes all size2, middle, and size1 should land in separate
+ * granules and thus the latter two offsets should be inaccessible.
+ */
+ KUNIT_EXPECT_LE(test, round_up(size2, KASAN_GRANULE_SIZE),
+ round_down(middle, KASAN_GRANULE_SIZE));
+ KUNIT_EXPECT_LE(test, round_up(middle, KASAN_GRANULE_SIZE),
+ round_down(size1, KASAN_GRANULE_SIZE));
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[middle] = 'x');
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1 - 1] = 'x');
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size1] = 'x');
+
kfree(ptr2);
}
-static noinline void __init kmalloc_oob_16(void)
+static void krealloc_more_oob(struct kunit *test)
+{
+ krealloc_more_oob_helper(test, 201, 235);
+}
+
+static void krealloc_less_oob(struct kunit *test)
+{
+ krealloc_less_oob_helper(test, 235, 201);
+}
+
+static void krealloc_pagealloc_more_oob(struct kunit *test)
+{
+ /* page_alloc fallback in only implemented for SLUB. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ krealloc_more_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 201,
+ KMALLOC_MAX_CACHE_SIZE + 235);
+}
+
+static void krealloc_pagealloc_less_oob(struct kunit *test)
+{
+ /* page_alloc fallback in only implemented for SLUB. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_SLUB);
+
+ krealloc_less_oob_helper(test, KMALLOC_MAX_CACHE_SIZE + 235,
+ KMALLOC_MAX_CACHE_SIZE + 201);
+}
+
+/*
+ * Check that krealloc() detects a use-after-free, returns NULL,
+ * and doesn't unpoison the freed object.
+ */
+static void krealloc_uaf(struct kunit *test)
+{
+ char *ptr1, *ptr2;
+ int size1 = 201;
+ int size2 = 235;
+
+ ptr1 = kmalloc(size1, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
+ kfree(ptr1);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr2 = krealloc(ptr1, size2, GFP_KERNEL));
+ KUNIT_ASSERT_PTR_EQ(test, (void *)ptr2, NULL);
+ KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)ptr1);
+}
+
+static void kmalloc_oob_16(struct kunit *test)
{
struct {
u64 words[2];
} *ptr1, *ptr2;
- pr_info("kmalloc out-of-bounds for 16-bytes access\n");
+ /* This test is specifically crafted for the generic mode. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
+
ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
+
ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
- if (!ptr1 || !ptr2) {
- pr_err("Allocation failed\n");
- kfree(ptr1);
- kfree(ptr2);
- return;
- }
- *ptr1 = *ptr2;
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
kfree(ptr1);
kfree(ptr2);
}
-static noinline void __init kmalloc_oob_memset_2(void)
+static void kmalloc_uaf_16(struct kunit *test)
+{
+ struct {
+ u64 words[2];
+ } *ptr1, *ptr2;
+
+ ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
+
+ ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
+ kfree(ptr2);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
+ kfree(ptr1);
+}
+
+static void kmalloc_oob_memset_2(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- memset(ptr+7, 0, 2);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2));
kfree(ptr);
}
-static noinline void __init kmalloc_oob_memset_4(void)
+static void kmalloc_oob_memset_4(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- memset(ptr+5, 0, 4);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4));
kfree(ptr);
}
-static noinline void __init kmalloc_oob_memset_8(void)
+static void kmalloc_oob_memset_8(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- memset(ptr+1, 0, 8);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8));
kfree(ptr);
}
-static noinline void __init kmalloc_oob_memset_16(void)
+static void kmalloc_oob_memset_16(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- memset(ptr+1, 0, 16);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16));
kfree(ptr);
}
-static noinline void __init kmalloc_oob_in_memset(void)
+static void kmalloc_oob_in_memset(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
- memset(ptr, 0, size+5);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF));
kfree(ptr);
}
-static noinline void __init kmalloc_uaf(void)
+static void kmalloc_memmove_invalid_size(struct kunit *test)
+{
+ char *ptr;
+ size_t size = 64;
+ volatile size_t invalid_size = -2;
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ memset((char *)ptr, 0, 64);
+
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ memmove((char *)ptr, (char *)ptr + 4, invalid_size));
+ kfree(ptr);
+}
+
+static void kmalloc_uaf(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
kfree(ptr);
- *(ptr + 8) = 'x';
+ KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x');
}
-static noinline void __init kmalloc_uaf_memset(void)
+static void kmalloc_uaf_memset(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
kfree(ptr);
- memset(ptr, 0, size);
+ KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size));
}
-static noinline void __init kmalloc_uaf2(void)
+static void kmalloc_uaf2(struct kunit *test)
{
char *ptr1, *ptr2;
size_t size = 43;
+ int counter = 0;
- pr_info("use-after-free after another kmalloc\n");
+again:
ptr1 = kmalloc(size, GFP_KERNEL);
- if (!ptr1) {
- pr_err("Allocation failed\n");
- return;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
kfree(ptr1);
+
ptr2 = kmalloc(size, GFP_KERNEL);
- if (!ptr2) {
- pr_err("Allocation failed\n");
- return;
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
+
+ /*
+ * For tag-based KASAN ptr1 and ptr2 tags might happen to be the same.
+ * Allow up to 16 attempts at generating different tags.
+ */
+ if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && ptr1 == ptr2 && counter++ < 16) {
+ kfree(ptr2);
+ goto again;
}
- ptr1[40] = 'x';
- if (ptr1 == ptr2)
- pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x');
+ KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2);
+
kfree(ptr2);
}
-static noinline void __init kmem_cache_oob(void)
+static void kfree_via_page(struct kunit *test)
+{
+ char *ptr;
+ size_t size = 8;
+ struct page *page;
+ unsigned long offset;
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ page = virt_to_page(ptr);
+ offset = offset_in_page(ptr);
+ kfree(page_address(page) + offset);
+}
+
+static void kfree_via_phys(struct kunit *test)
+{
+ char *ptr;
+ size_t size = 8;
+ phys_addr_t phys;
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ phys = virt_to_phys(ptr);
+ kfree(phys_to_virt(phys));
+}
+
+static void kmem_cache_oob(struct kunit *test)
{
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");
+ struct kmem_cache *cache;
+
+ cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
p = kmem_cache_alloc(cache, GFP_KERNEL);
if (!p) {
- pr_err("Allocation failed\n");
+ kunit_err(test, "Allocation failed: %s\n", __func__);
kmem_cache_destroy(cache);
return;
}
- *p = p[size];
+ KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
+
kmem_cache_free(cache, p);
kmem_cache_destroy(cache);
}
-static noinline void __init memcg_accounted_kmem_cache(void)
+static void kmem_cache_accounted(struct kunit *test)
{
int i;
char *p;
@@ -373,12 +603,8 @@
struct kmem_cache *cache;
cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
- if (!cache) {
- pr_err("Cache allocation failed\n");
- return;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
- pr_info("allocate memcg accounted object\n");
/*
* Several allocations with a delay to allow for lazy per memcg kmem
* cache creation.
@@ -396,136 +622,157 @@
kmem_cache_destroy(cache);
}
+static void kmem_cache_bulk(struct kunit *test)
+{
+ struct kmem_cache *cache;
+ size_t size = 200;
+ char *p[10];
+ bool ret;
+ int i;
+
+ cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
+ ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, ARRAY_SIZE(p), (void **)&p);
+ if (!ret) {
+ kunit_err(test, "Allocation failed: %s\n", __func__);
+ kmem_cache_destroy(cache);
+ return;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(p); i++)
+ p[i][0] = p[i][size - 1] = 42;
+
+ kmem_cache_free_bulk(cache, ARRAY_SIZE(p), (void **)&p);
+ kmem_cache_destroy(cache);
+}
+
static char global_array[10];
-static noinline void __init kasan_global_oob(void)
+static void kasan_global_oob(struct kunit *test)
{
- volatile int i = 3;
- char *p = &global_array[ARRAY_SIZE(global_array) + i];
+ /*
+ * Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS
+ * from failing here and panicing the kernel, access the array via a
+ * volatile pointer, which will prevent the compiler from being able to
+ * determine the array bounds.
+ *
+ * This access uses a volatile pointer to char (char *volatile) rather
+ * than the more conventional pointer to volatile char (volatile char *)
+ * because we want to prevent the compiler from making inferences about
+ * the pointer itself (i.e. its array bounds), not the data that it
+ * refers to.
+ */
+ char *volatile array = global_array;
+ char *p = &array[ARRAY_SIZE(global_array) + 3];
- pr_info("out-of-bounds global variable\n");
- *(volatile char *)p;
+ /* Only generic mode instruments globals. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *(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)
+/* Check that ksize() makes the whole object accessible. */
+static void ksize_unpoisons_memory(struct kunit *test)
{
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;
- }
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
real_size = ksize(ptr);
- /* This access doesn't trigger an error. */
+
+ /* This access shouldn't trigger a KASAN report. */
ptr[size] = 'x';
- /* This one does. */
- ptr[real_size] = 'y';
+
+ /* This one must. */
+ KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y');
+
kfree(ptr);
}
-static noinline void __init copy_user_test(void)
+/*
+ * Check that a use-after-free is detected by ksize() and via normal accesses
+ * after it.
+ */
+static void ksize_uaf(struct kunit *test)
{
- char *kmem;
- char __user *usermem;
- size_t size = 10;
- int unused;
+ char *ptr;
+ int size = 128 - KASAN_GRANULE_SIZE;
- kmem = kmalloc(size, GFP_KERNEL);
- if (!kmem)
- return;
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ kfree(ptr);
- 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);
+ KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr));
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *ptr);
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = *(ptr + size));
}
-static noinline void __init kasan_alloca_oob_left(void)
+static void kasan_stack_oob(struct kunit *test)
+{
+ char stack_array[10];
+ /* See comment in kasan_global_oob. */
+ char *volatile array = stack_array;
+ char *p = &array[ARRAY_SIZE(stack_array) + OOB_TAG_OFF];
+
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
+}
+
+static void kasan_alloca_oob_left(struct kunit *test)
{
volatile int i = 10;
char alloca_array[i];
- char *p = alloca_array - 1;
+ /* See comment in kasan_global_oob. */
+ char *volatile array = alloca_array;
+ char *p = array - 1;
- pr_info("out-of-bounds to left on alloca\n");
- *(volatile char *)p;
+ /* Only generic mode instruments dynamic allocas. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
}
-static noinline void __init kasan_alloca_oob_right(void)
+static void kasan_alloca_oob_right(struct kunit *test)
{
volatile int i = 10;
char alloca_array[i];
- char *p = alloca_array + i;
+ /* See comment in kasan_global_oob. */
+ char *volatile array = alloca_array;
+ char *p = array + i;
- pr_info("out-of-bounds to right on alloca\n");
- *(volatile char *)p;
+ /* Only generic mode instruments dynamic allocas. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_STACK);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
}
-static noinline void __init kmem_cache_double_free(void)
+static void kmem_cache_double_free(struct kunit *test)
{
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");
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
p = kmem_cache_alloc(cache, GFP_KERNEL);
if (!p) {
- pr_err("Allocation failed\n");
+ kunit_err(test, "Allocation failed: %s\n", __func__);
kmem_cache_destroy(cache);
return;
}
kmem_cache_free(cache, p);
- kmem_cache_free(cache, p);
+ KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
kmem_cache_destroy(cache);
}
-static noinline void __init kmem_cache_invalid_free(void)
+static void kmem_cache_invalid_free(struct kunit *test)
{
char *p;
size_t size = 200;
@@ -533,20 +780,17 @@
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");
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
p = kmem_cache_alloc(cache, GFP_KERNEL);
if (!p) {
- pr_err("Allocation failed\n");
+ kunit_err(test, "Allocation failed: %s\n", __func__);
kmem_cache_destroy(cache);
return;
}
- /* Trigger invalid free, the object doesn't get freed */
- kmem_cache_free(cache, p + 1);
+ /* Trigger invalid free, the object doesn't get freed. */
+ KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
/*
* Properly free the object to prevent the "Objects remaining in
@@ -557,45 +801,66 @@
kmem_cache_destroy(cache);
}
-static noinline void __init kasan_memchr(void)
+static void kasan_memchr(struct kunit *test)
{
char *ptr;
size_t size = 24;
- pr_info("out-of-bounds in memchr\n");
- ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
- if (!ptr)
- return;
+ /*
+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
+ */
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
- memchr(ptr, '1', size + 1);
+ if (OOB_TAG_OFF)
+ size = round_up(size, OOB_TAG_OFF);
+
+ ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ kasan_ptr_result = memchr(ptr, '1', size + 1));
+
kfree(ptr);
}
-static noinline void __init kasan_memcmp(void)
+static void kasan_memcmp(struct kunit *test)
{
char *ptr;
size_t size = 24;
int arr[9];
- pr_info("out-of-bounds in memcmp\n");
- ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
- if (!ptr)
- return;
+ /*
+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
+ */
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
+ if (OOB_TAG_OFF)
+ size = round_up(size, OOB_TAG_OFF);
+
+ ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
memset(arr, 0, sizeof(arr));
- memcmp(ptr, arr, size+1);
+
+ KUNIT_EXPECT_KASAN_FAIL(test,
+ kasan_int_result = memcmp(ptr, arr, size+1));
kfree(ptr);
}
-static noinline void __init kasan_strings(void)
+static void kasan_strings(struct kunit *test)
{
char *ptr;
size_t size = 24;
- pr_info("use-after-free in strchr\n");
+ /*
+ * str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT.
+ * See https://bugzilla.kernel.org/show_bug.cgi?id=206337 for details.
+ */
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_AMD_MEM_ENCRYPT);
+
ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
- if (!ptr)
- return;
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
kfree(ptr);
@@ -606,70 +871,271 @@
* will likely point to zeroed byte.
*/
ptr += 16;
- strchr(ptr, '1');
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1'));
- pr_info("use-after-free in strrchr\n");
- strrchr(ptr, '1');
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1'));
- pr_info("use-after-free in strcmp\n");
- strcmp(ptr, "2");
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2"));
- pr_info("use-after-free in strncmp\n");
- strncmp(ptr, "2", 1);
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1));
- pr_info("use-after-free in strlen\n");
- strlen(ptr);
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr));
- pr_info("use-after-free in strnlen\n");
- strnlen(ptr, 1);
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1));
}
-static int __init kmalloc_tests_init(void)
+static void kasan_bitops_modify(struct kunit *test, int nr, void *addr)
{
- /*
- * 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();
- kmem_cache_double_free();
- kmem_cache_invalid_free();
- kasan_memchr();
- kasan_memcmp();
- kasan_strings();
-
- kasan_restore_multi_shot(multishot);
-
- return -EAGAIN;
+ KUNIT_EXPECT_KASAN_FAIL(test, set_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, change_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(nr, addr));
}
-module_init(kmalloc_tests_init);
+static void kasan_bitops_test_and_modify(struct kunit *test, int nr, void *addr)
+{
+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_set_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_set_bit_lock(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_clear_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_clear_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr));
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr));
+
+#if defined(clear_bit_unlock_is_negative_byte)
+ KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result =
+ clear_bit_unlock_is_negative_byte(nr, addr));
+#endif
+}
+
+static void kasan_bitops_generic(struct kunit *test)
+{
+ long *bits;
+
+ /* This test is specifically crafted for the generic mode. */
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC);
+
+ /*
+ * Allocate 1 more byte, which causes kzalloc to round up to 16 bytes;
+ * this way we do not actually corrupt other memory.
+ */
+ bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits);
+
+ /*
+ * Below calls try to access bit within allocated memory; however, the
+ * below accesses are still out-of-bounds, since bitops are defined to
+ * operate on the whole long the bit is in.
+ */
+ kasan_bitops_modify(test, BITS_PER_LONG, bits);
+
+ /*
+ * Below calls try to access bit beyond allocated memory.
+ */
+ kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, bits);
+
+ kfree(bits);
+}
+
+static void kasan_bitops_tags(struct kunit *test)
+{
+ long *bits;
+
+ /* This test is specifically crafted for tag-based modes. */
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
+
+ /* kmalloc-64 cache will be used and the last 16 bytes will be the redzone. */
+ bits = kzalloc(48, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits);
+
+ /* Do the accesses past the 48 allocated bytes, but within the redone. */
+ kasan_bitops_modify(test, BITS_PER_LONG, (void *)bits + 48);
+ kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, (void *)bits + 48);
+
+ kfree(bits);
+}
+
+static void kmalloc_double_kzfree(struct kunit *test)
+{
+ char *ptr;
+ size_t size = 16;
+
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ kfree_sensitive(ptr);
+ KUNIT_EXPECT_KASAN_FAIL(test, kfree_sensitive(ptr));
+}
+
+static void vmalloc_oob(struct kunit *test)
+{
+ void *area;
+
+ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC);
+
+ /*
+ * We have to be careful not to hit the guard page.
+ * The MMU will catch that and crash us.
+ */
+ area = vmalloc(3000);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area);
+
+ KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]);
+ vfree(area);
+}
+
+/*
+ * Check that the assigned pointer tag falls within the [KASAN_TAG_MIN,
+ * KASAN_TAG_KERNEL) range (note: excluding the match-all tag) for tag-based
+ * modes.
+ */
+static void match_all_not_assigned(struct kunit *test)
+{
+ char *ptr;
+ struct page *pages;
+ int i, size, order;
+
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
+
+ for (i = 0; i < 256; i++) {
+ size = (get_random_int() % 1024) + 1;
+ ptr = kmalloc(size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
+ KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
+ kfree(ptr);
+ }
+
+ for (i = 0; i < 256; i++) {
+ order = (get_random_int() % 4) + 1;
+ pages = alloc_pages(GFP_KERNEL, order);
+ ptr = page_address(pages);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
+ KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
+ free_pages((unsigned long)ptr, order);
+ }
+}
+
+/* Check that 0xff works as a match-all pointer tag for tag-based modes. */
+static void match_all_ptr_tag(struct kunit *test)
+{
+ char *ptr;
+ u8 tag;
+
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
+
+ ptr = kmalloc(128, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+
+ /* Backup the assigned tag. */
+ tag = get_tag(ptr);
+ KUNIT_EXPECT_NE(test, tag, (u8)KASAN_TAG_KERNEL);
+
+ /* Reset the tag to 0xff.*/
+ ptr = set_tag(ptr, KASAN_TAG_KERNEL);
+
+ /* This access shouldn't trigger a KASAN report. */
+ *ptr = 0;
+
+ /* Recover the pointer tag and free. */
+ ptr = set_tag(ptr, tag);
+ kfree(ptr);
+}
+
+/* Check that there are no match-all memory tags for tag-based modes. */
+static void match_all_mem_tag(struct kunit *test)
+{
+ char *ptr;
+ int tag;
+
+ KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
+
+ ptr = kmalloc(128, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ KUNIT_EXPECT_NE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL);
+
+ /* For each possible tag value not matching the pointer tag. */
+ for (tag = KASAN_TAG_MIN; tag <= KASAN_TAG_KERNEL; tag++) {
+ if (tag == get_tag(ptr))
+ continue;
+
+ /* Mark the first memory granule with the chosen memory tag. */
+ kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false);
+
+ /* This access must cause a KASAN report. */
+ KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0);
+ }
+
+ /* Recover the memory tag and free. */
+ kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false);
+ kfree(ptr);
+}
+
+static struct kunit_case kasan_kunit_test_cases[] = {
+ KUNIT_CASE(kmalloc_oob_right),
+ KUNIT_CASE(kmalloc_oob_left),
+ KUNIT_CASE(kmalloc_node_oob_right),
+ KUNIT_CASE(kmalloc_pagealloc_oob_right),
+ KUNIT_CASE(kmalloc_pagealloc_uaf),
+ KUNIT_CASE(kmalloc_pagealloc_invalid_free),
+ KUNIT_CASE(pagealloc_oob_right),
+ KUNIT_CASE(pagealloc_uaf),
+ KUNIT_CASE(kmalloc_large_oob_right),
+ KUNIT_CASE(krealloc_more_oob),
+ KUNIT_CASE(krealloc_less_oob),
+ KUNIT_CASE(krealloc_pagealloc_more_oob),
+ KUNIT_CASE(krealloc_pagealloc_less_oob),
+ KUNIT_CASE(krealloc_uaf),
+ KUNIT_CASE(kmalloc_oob_16),
+ KUNIT_CASE(kmalloc_uaf_16),
+ KUNIT_CASE(kmalloc_oob_in_memset),
+ KUNIT_CASE(kmalloc_oob_memset_2),
+ KUNIT_CASE(kmalloc_oob_memset_4),
+ KUNIT_CASE(kmalloc_oob_memset_8),
+ KUNIT_CASE(kmalloc_oob_memset_16),
+ KUNIT_CASE(kmalloc_memmove_invalid_size),
+ KUNIT_CASE(kmalloc_uaf),
+ KUNIT_CASE(kmalloc_uaf_memset),
+ KUNIT_CASE(kmalloc_uaf2),
+ KUNIT_CASE(kfree_via_page),
+ KUNIT_CASE(kfree_via_phys),
+ KUNIT_CASE(kmem_cache_oob),
+ KUNIT_CASE(kmem_cache_accounted),
+ KUNIT_CASE(kmem_cache_bulk),
+ KUNIT_CASE(kasan_global_oob),
+ KUNIT_CASE(kasan_stack_oob),
+ KUNIT_CASE(kasan_alloca_oob_left),
+ KUNIT_CASE(kasan_alloca_oob_right),
+ KUNIT_CASE(ksize_unpoisons_memory),
+ KUNIT_CASE(ksize_uaf),
+ KUNIT_CASE(kmem_cache_double_free),
+ KUNIT_CASE(kmem_cache_invalid_free),
+ KUNIT_CASE(kasan_memchr),
+ KUNIT_CASE(kasan_memcmp),
+ KUNIT_CASE(kasan_strings),
+ KUNIT_CASE(kasan_bitops_generic),
+ KUNIT_CASE(kasan_bitops_tags),
+ KUNIT_CASE(kmalloc_double_kzfree),
+ KUNIT_CASE(vmalloc_oob),
+ KUNIT_CASE(match_all_not_assigned),
+ KUNIT_CASE(match_all_ptr_tag),
+ KUNIT_CASE(match_all_mem_tag),
+ {}
+};
+
+static struct kunit_suite kasan_kunit_test_suite = {
+ .name = "kasan",
+ .init = kasan_test_init,
+ .test_cases = kasan_kunit_test_cases,
+ .exit = kasan_test_exit,
+};
+
+kunit_test_suite(kasan_kunit_test_suite);
+
MODULE_LICENSE("GPL");
--
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