forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1416 lines
37 KiB
1416 lines
37 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* |
|
* Copyright (c) 2014 Samsung Electronics Co., Ltd. |
|
* Author: Andrey Ryabinin <[email protected]> |
|
*/ |
|
|
|
#include <linux/bitops.h> |
|
#include <linux/delay.h> |
|
#include <linux/kasan.h> |
|
#include <linux/kernel.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/io.h> |
|
#include <linux/vmalloc.h> |
|
#include <linux/set_memory.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) |
|
|
|
/* |
|
* 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 struct kunit_resource resource; |
|
static struct kunit_kasan_status test_status; |
|
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(); |
|
test_status.report_found = false; |
|
test_status.sync_fault = false; |
|
kunit_add_named_resource(test, NULL, NULL, &resource, |
|
"kasan_status", &test_status); |
|
return 0; |
|
} |
|
|
|
static void kasan_test_exit(struct kunit *test) |
|
{ |
|
kasan_restore_multi_shot(multishot); |
|
KUNIT_EXPECT_FALSE(test, test_status.report_found); |
|
} |
|
|
|
/** |
|
* 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_status". Do not use this name for KUnit resources |
|
* outside of KASAN tests. |
|
* |
|
* For hardware tag-based KASAN, when a synchronous 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 test_status |
|
* 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. |
|
* |
|
* In between KUNIT_EXPECT_KASAN_FAIL checks, test_status.report_found is kept |
|
* as false. This allows detecting KASAN reports that happen outside of the |
|
* checks by asserting !test_status.report_found at the start of |
|
* KUNIT_EXPECT_KASAN_FAIL and in kasan_test_exit. |
|
*/ |
|
#define KUNIT_EXPECT_KASAN_FAIL(test, expression) do { \ |
|
if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \ |
|
kasan_sync_fault_possible()) \ |
|
migrate_disable(); \ |
|
KUNIT_EXPECT_FALSE(test, READ_ONCE(test_status.report_found)); \ |
|
barrier(); \ |
|
expression; \ |
|
barrier(); \ |
|
if (kasan_async_fault_possible()) \ |
|
kasan_force_async_fault(); \ |
|
if (!READ_ONCE(test_status.report_found)) { \ |
|
KUNIT_FAIL(test, KUNIT_SUBTEST_INDENT "KASAN failure " \ |
|
"expected in \"" #expression \ |
|
"\", but none occurred"); \ |
|
} \ |
|
if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \ |
|
kasan_sync_fault_possible()) { \ |
|
if (READ_ONCE(test_status.report_found) && \ |
|
READ_ONCE(test_status.sync_fault)) \ |
|
kasan_enable_tagging(); \ |
|
migrate_enable(); \ |
|
} \ |
|
WRITE_ONCE(test_status.report_found, false); \ |
|
} while (0) |
|
|
|
#define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \ |
|
if (!IS_ENABLED(config)) \ |
|
kunit_skip((test), "Test requires " #config "=y"); \ |
|
} while (0) |
|
|
|
#define KASAN_TEST_NEEDS_CONFIG_OFF(test, config) do { \ |
|
if (IS_ENABLED(config)) \ |
|
kunit_skip((test), "Test requires " #config "=n"); \ |
|
} while (0) |
|
|
|
static void kmalloc_oob_right(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE - 5; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
/* |
|
* An unaligned access past the requested kmalloc size. |
|
* Only generic KASAN can precisely detect these. |
|
*/ |
|
if (IS_ENABLED(CONFIG_KASAN_GENERIC)) |
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'x'); |
|
|
|
/* |
|
* An aligned access into the first out-of-bounds granule that falls |
|
* within the aligned kmalloc object. |
|
*/ |
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + 5] = 'y'); |
|
|
|
/* Out-of-bounds access past the aligned kmalloc object. */ |
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = |
|
ptr[size + KASAN_GRANULE_SIZE + 5]); |
|
|
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_oob_left(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 15; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_node_oob_right(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 4096; |
|
|
|
ptr = kmalloc_node(size, GFP_KERNEL, 0); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
|
kfree(ptr); |
|
} |
|
|
|
/* |
|
* 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; |
|
|
|
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, ((volatile char *)ptr)[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. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); |
|
|
|
pages = alloc_pages(GFP_KERNEL, order); |
|
ptr = page_address(pages); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = ptr[size]); |
|
free_pages((unsigned long)ptr, order); |
|
} |
|
|
|
static void pagealloc_uaf(struct kunit *test) |
|
{ |
|
char *ptr; |
|
struct page *pages; |
|
size_t order = 4; |
|
|
|
pages = alloc_pages(GFP_KERNEL, order); |
|
ptr = page_address(pages); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
free_pages((unsigned long)ptr, order); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
|
} |
|
|
|
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 |
|
* and does not trigger the page allocator fallback in SLUB. |
|
*/ |
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0); |
|
kfree(ptr); |
|
} |
|
|
|
static void krealloc_more_oob_helper(struct kunit *test, |
|
size_t size1, size_t size2) |
|
{ |
|
char *ptr1, *ptr2; |
|
size_t middle; |
|
|
|
KUNIT_ASSERT_LT(test, size1, size2); |
|
middle = size1 + (size2 - size1) / 2; |
|
|
|
ptr1 = kmalloc(size1, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
|
|
|
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 void krealloc_less_oob_helper(struct kunit *test, |
|
size_t size1, size_t size2) |
|
{ |
|
char *ptr1, *ptr2; |
|
size_t middle; |
|
|
|
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); |
|
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 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; |
|
|
|
/* 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); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2); |
|
kfree(ptr1); |
|
kfree(ptr2); |
|
} |
|
|
|
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); |
|
} |
|
|
|
/* |
|
* Note: in the memset tests below, the written range touches both valid and |
|
* invalid memory. This makes sure that the instrumentation does not only check |
|
* the starting address but the whole range. |
|
*/ |
|
|
|
static void kmalloc_oob_memset_2(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 1, 0, 2)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_oob_memset_4(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 3, 0, 4)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_oob_memset_8(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 7, 0, 8)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_oob_memset_16(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 15, 0, 16)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_oob_in_memset(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(ptr); |
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, |
|
memset(ptr, 0, size + KASAN_GRANULE_SIZE)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_memmove_negative_size(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 64; |
|
size_t invalid_size = -2; |
|
|
|
/* |
|
* Hardware tag-based mode doesn't check memmove for negative size. |
|
* As a result, this test introduces a side-effect memory corruption, |
|
* which can result in a crash. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_HW_TAGS); |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
memset((char *)ptr, 0, 64); |
|
OPTIMIZER_HIDE_VAR(ptr); |
|
OPTIMIZER_HIDE_VAR(invalid_size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, |
|
memmove((char *)ptr, (char *)ptr + 4, invalid_size)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kmalloc_memmove_invalid_size(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 64; |
|
volatile size_t invalid_size = size; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
memset((char *)ptr, 0, 64); |
|
OPTIMIZER_HIDE_VAR(ptr); |
|
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; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
kfree(ptr); |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[8]); |
|
} |
|
|
|
static void kmalloc_uaf_memset(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 33; |
|
|
|
/* |
|
* Only generic KASAN uses quarantine, which is required to avoid a |
|
* kernel memory corruption this test causes. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
kfree(ptr); |
|
KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size)); |
|
} |
|
|
|
static void kmalloc_uaf2(struct kunit *test) |
|
{ |
|
char *ptr1, *ptr2; |
|
size_t size = 43; |
|
int counter = 0; |
|
|
|
again: |
|
ptr1 = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); |
|
|
|
kfree(ptr1); |
|
|
|
ptr2 = kmalloc(size, GFP_KERNEL); |
|
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; |
|
} |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr1)[40]); |
|
KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2); |
|
|
|
kfree(ptr2); |
|
} |
|
|
|
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; |
|
|
|
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) { |
|
kunit_err(test, "Allocation failed: %s\n", __func__); |
|
kmem_cache_destroy(cache); |
|
return; |
|
} |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]); |
|
|
|
kmem_cache_free(cache, p); |
|
kmem_cache_destroy(cache); |
|
} |
|
|
|
static void kmem_cache_accounted(struct kunit *test) |
|
{ |
|
int i; |
|
char *p; |
|
size_t size = 200; |
|
struct kmem_cache *cache; |
|
|
|
cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
|
|
|
/* |
|
* 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 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 void kasan_global_oob_right(struct kunit *test) |
|
{ |
|
/* |
|
* Deliberate out-of-bounds access. To prevent CONFIG_UBSAN_LOCAL_BOUNDS |
|
* from failing here and panicking 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]; |
|
|
|
/* Only generic mode instruments globals. */ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
|
} |
|
|
|
static void kasan_global_oob_left(struct kunit *test) |
|
{ |
|
char *volatile array = global_array; |
|
char *p = array - 3; |
|
|
|
/* |
|
* GCC is known to fail this test, skip it. |
|
* See https://bugzilla.kernel.org/show_bug.cgi?id=215051. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_CC_IS_CLANG); |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); |
|
KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p); |
|
} |
|
|
|
/* Check that ksize() makes the whole object accessible. */ |
|
static void ksize_unpoisons_memory(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 123, real_size; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
real_size = ksize(ptr); |
|
|
|
/* This access shouldn't trigger a KASAN report. */ |
|
ptr[size] = 'x'; |
|
|
|
/* This one must. */ |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[real_size]); |
|
|
|
kfree(ptr); |
|
} |
|
|
|
/* |
|
* Check that a use-after-free is detected by ksize() and via normal accesses |
|
* after it. |
|
*/ |
|
static void ksize_uaf(struct kunit *test) |
|
{ |
|
char *ptr; |
|
int size = 128 - KASAN_GRANULE_SIZE; |
|
|
|
ptr = kmalloc(size, GFP_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
kfree(ptr); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]); |
|
} |
|
|
|
static void kasan_stack_oob(struct kunit *test) |
|
{ |
|
char stack_array[10]; |
|
/* See comment in kasan_global_oob_right. */ |
|
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]; |
|
/* See comment in kasan_global_oob_right. */ |
|
char *volatile array = alloca_array; |
|
char *p = array - 1; |
|
|
|
/* 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 void kasan_alloca_oob_right(struct kunit *test) |
|
{ |
|
volatile int i = 10; |
|
char alloca_array[i]; |
|
/* See comment in kasan_global_oob_right. */ |
|
char *volatile array = alloca_array; |
|
char *p = array + i; |
|
|
|
/* 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 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); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
|
|
|
p = kmem_cache_alloc(cache, GFP_KERNEL); |
|
if (!p) { |
|
kunit_err(test, "Allocation failed: %s\n", __func__); |
|
kmem_cache_destroy(cache); |
|
return; |
|
} |
|
|
|
kmem_cache_free(cache, p); |
|
KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p)); |
|
kmem_cache_destroy(cache); |
|
} |
|
|
|
static void kmem_cache_invalid_free(struct kunit *test) |
|
{ |
|
char *p; |
|
size_t size = 200; |
|
struct kmem_cache *cache; |
|
|
|
cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU, |
|
NULL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
|
|
|
p = kmem_cache_alloc(cache, GFP_KERNEL); |
|
if (!p) { |
|
kunit_err(test, "Allocation failed: %s\n", __func__); |
|
kmem_cache_destroy(cache); |
|
return; |
|
} |
|
|
|
/* 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 |
|
* test_cache on __kmem_cache_shutdown" BUG failure. |
|
*/ |
|
kmem_cache_free(cache, p); |
|
|
|
kmem_cache_destroy(cache); |
|
} |
|
|
|
static void empty_cache_ctor(void *object) { } |
|
|
|
static void kmem_cache_double_destroy(struct kunit *test) |
|
{ |
|
struct kmem_cache *cache; |
|
|
|
/* Provide a constructor to prevent cache merging. */ |
|
cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache); |
|
kmem_cache_destroy(cache); |
|
KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache)); |
|
} |
|
|
|
static void kasan_memchr(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 24; |
|
|
|
/* |
|
* 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); |
|
|
|
OPTIMIZER_HIDE_VAR(ptr); |
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, |
|
kasan_ptr_result = memchr(ptr, '1', size + 1)); |
|
|
|
kfree(ptr); |
|
} |
|
|
|
static void kasan_memcmp(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 24; |
|
int arr[9]; |
|
|
|
/* |
|
* 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)); |
|
|
|
OPTIMIZER_HIDE_VAR(ptr); |
|
OPTIMIZER_HIDE_VAR(size); |
|
KUNIT_EXPECT_KASAN_FAIL(test, |
|
kasan_int_result = memcmp(ptr, arr, size+1)); |
|
kfree(ptr); |
|
} |
|
|
|
static void kasan_strings(struct kunit *test) |
|
{ |
|
char *ptr; |
|
size_t size = 24; |
|
|
|
/* |
|
* 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); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
kfree(ptr); |
|
|
|
/* |
|
* Try to cause only 1 invalid access (less spam in dmesg). |
|
* For that we need ptr to point to zeroed byte. |
|
* Skip metadata that could be stored in freed object so ptr |
|
* will likely point to zeroed byte. |
|
*/ |
|
ptr += 16; |
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strchr(ptr, '1')); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_ptr_result = strrchr(ptr, '1')); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strcmp(ptr, "2")); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strncmp(ptr, "2", 1)); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strlen(ptr)); |
|
|
|
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = strnlen(ptr, 1)); |
|
} |
|
|
|
static void kasan_bitops_modify(struct kunit *test, int nr, void *addr) |
|
{ |
|
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)); |
|
} |
|
|
|
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_helpers_tags(struct kunit *test) |
|
{ |
|
void *ptr; |
|
|
|
/* This test is intended for tag-based modes. */ |
|
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC); |
|
|
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
|
|
|
ptr = vmalloc(PAGE_SIZE); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); |
|
|
|
/* Check that the returned pointer is tagged. */ |
|
KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN); |
|
KUNIT_EXPECT_LT(test, (u8)get_tag(ptr), (u8)KASAN_TAG_KERNEL); |
|
|
|
/* Make sure exported vmalloc helpers handle tagged pointers. */ |
|
KUNIT_ASSERT_TRUE(test, is_vmalloc_addr(ptr)); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, vmalloc_to_page(ptr)); |
|
|
|
#if !IS_MODULE(CONFIG_KASAN_KUNIT_TEST) |
|
{ |
|
int rv; |
|
|
|
/* Make sure vmalloc'ed memory permissions can be changed. */ |
|
rv = set_memory_ro((unsigned long)ptr, 1); |
|
KUNIT_ASSERT_GE(test, rv, 0); |
|
rv = set_memory_rw((unsigned long)ptr, 1); |
|
KUNIT_ASSERT_GE(test, rv, 0); |
|
} |
|
#endif |
|
|
|
vfree(ptr); |
|
} |
|
|
|
static void vmalloc_oob(struct kunit *test) |
|
{ |
|
char *v_ptr, *p_ptr; |
|
struct page *page; |
|
size_t size = PAGE_SIZE / 2 - KASAN_GRANULE_SIZE - 5; |
|
|
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
|
|
|
v_ptr = vmalloc(size); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); |
|
|
|
OPTIMIZER_HIDE_VAR(v_ptr); |
|
|
|
/* |
|
* We have to be careful not to hit the guard page in vmalloc tests. |
|
* The MMU will catch that and crash us. |
|
*/ |
|
|
|
/* Make sure in-bounds accesses are valid. */ |
|
v_ptr[0] = 0; |
|
v_ptr[size - 1] = 0; |
|
|
|
/* |
|
* An unaligned access past the requested vmalloc size. |
|
* Only generic KASAN can precisely detect these. |
|
*/ |
|
if (IS_ENABLED(CONFIG_KASAN_GENERIC)) |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size]); |
|
|
|
/* An aligned access into the first out-of-bounds granule. */ |
|
KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)v_ptr)[size + 5]); |
|
|
|
/* Check that in-bounds accesses to the physical page are valid. */ |
|
page = vmalloc_to_page(v_ptr); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, page); |
|
p_ptr = page_address(page); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); |
|
p_ptr[0] = 0; |
|
|
|
vfree(v_ptr); |
|
|
|
/* |
|
* We can't check for use-after-unmap bugs in this nor in the following |
|
* vmalloc tests, as the page might be fully unmapped and accessing it |
|
* will crash the kernel. |
|
*/ |
|
} |
|
|
|
static void vmap_tags(struct kunit *test) |
|
{ |
|
char *p_ptr, *v_ptr; |
|
struct page *p_page, *v_page; |
|
|
|
/* |
|
* This test is specifically crafted for the software tag-based mode, |
|
* the only tag-based mode that poisons vmap mappings. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); |
|
|
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_VMALLOC); |
|
|
|
p_page = alloc_pages(GFP_KERNEL, 1); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_page); |
|
p_ptr = page_address(p_page); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); |
|
|
|
v_ptr = vmap(&p_page, 1, VM_MAP, PAGE_KERNEL); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); |
|
|
|
/* |
|
* We can't check for out-of-bounds bugs in this nor in the following |
|
* vmalloc tests, as allocations have page granularity and accessing |
|
* the guard page will crash the kernel. |
|
*/ |
|
|
|
KUNIT_EXPECT_GE(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_MIN); |
|
KUNIT_EXPECT_LT(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_KERNEL); |
|
|
|
/* Make sure that in-bounds accesses through both pointers work. */ |
|
*p_ptr = 0; |
|
*v_ptr = 0; |
|
|
|
/* Make sure vmalloc_to_page() correctly recovers the page pointer. */ |
|
v_page = vmalloc_to_page(v_ptr); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_page); |
|
KUNIT_EXPECT_PTR_EQ(test, p_page, v_page); |
|
|
|
vunmap(v_ptr); |
|
free_pages((unsigned long)p_ptr, 1); |
|
} |
|
|
|
static void vm_map_ram_tags(struct kunit *test) |
|
{ |
|
char *p_ptr, *v_ptr; |
|
struct page *page; |
|
|
|
/* |
|
* This test is specifically crafted for the software tag-based mode, |
|
* the only tag-based mode that poisons vm_map_ram mappings. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); |
|
|
|
page = alloc_pages(GFP_KERNEL, 1); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, page); |
|
p_ptr = page_address(page); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p_ptr); |
|
|
|
v_ptr = vm_map_ram(&page, 1, -1); |
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, v_ptr); |
|
|
|
KUNIT_EXPECT_GE(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_MIN); |
|
KUNIT_EXPECT_LT(test, (u8)get_tag(v_ptr), (u8)KASAN_TAG_KERNEL); |
|
|
|
/* Make sure that in-bounds accesses through both pointers work. */ |
|
*p_ptr = 0; |
|
*v_ptr = 0; |
|
|
|
vm_unmap_ram(v_ptr, 1); |
|
free_pages((unsigned long)p_ptr, 1); |
|
} |
|
|
|
static void vmalloc_percpu(struct kunit *test) |
|
{ |
|
char __percpu *ptr; |
|
int cpu; |
|
|
|
/* |
|
* This test is specifically crafted for the software tag-based mode, |
|
* the only tag-based mode that poisons percpu mappings. |
|
*/ |
|
KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_SW_TAGS); |
|
|
|
ptr = __alloc_percpu(PAGE_SIZE, PAGE_SIZE); |
|
|
|
for_each_possible_cpu(cpu) { |
|
char *c_ptr = per_cpu_ptr(ptr, cpu); |
|
|
|
KUNIT_EXPECT_GE(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_MIN); |
|
KUNIT_EXPECT_LT(test, (u8)get_tag(c_ptr), (u8)KASAN_TAG_KERNEL); |
|
|
|
/* Make sure that in-bounds accesses don't crash the kernel. */ |
|
*c_ptr = 0; |
|
} |
|
|
|
free_percpu(ptr); |
|
} |
|
|
|
/* |
|
* 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); |
|
} |
|
|
|
if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) |
|
return; |
|
|
|
for (i = 0; i < 256; i++) { |
|
size = (get_random_int() % 1024) + 1; |
|
ptr = vmalloc(size); |
|
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); |
|
vfree(ptr); |
|
} |
|
} |
|
|
|
/* 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_negative_size), |
|
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_right), |
|
KUNIT_CASE(kasan_global_oob_left), |
|
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(kmem_cache_double_destroy), |
|
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_helpers_tags), |
|
KUNIT_CASE(vmalloc_oob), |
|
KUNIT_CASE(vmap_tags), |
|
KUNIT_CASE(vm_map_ram_tags), |
|
KUNIT_CASE(vmalloc_percpu), |
|
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");
|
|
|