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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
  * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
  */
 
 #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);
 
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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_NULL(test, ptr2);
     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);
 
     OPTIMIZER_HIDE_VAR(ptr1);
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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);
 
     OPTIMIZER_HIDE_VAR(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");

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