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![Andrey Konovalov](/assets/img/avatar_default.png)
Now that we have KASAN-KUNIT tests integration, it's easy to see that some KASAN tests are not adopted to the SW_TAGS mode and are failing. Adjust the allocation size for kasan_memchr() and kasan_memcmp() by roung it up to OOB_TAG_OFF so the bad access ends up in a separate memory granule. Add a new kmalloc_uaf_16() tests that relies on UAF, and a new kasan_bitops_tags() test that is tailored to tag-based mode, as it's hard to adopt the existing kmalloc_oob_16() and kasan_bitops_generic() (renamed from kasan_bitops()) without losing the precision. Add new kmalloc_uaf_16() and kasan_bitops_uaf() tests that rely on UAFs, as it's hard to adopt the existing kmalloc_oob_16() and kasan_bitops_oob() (rename from kasan_bitops()) without losing the precision. Disable kasan_global_oob() and kasan_alloca_oob_left/right() as SW_TAGS mode doesn't instrument globals nor dynamic allocas. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: David Gow <davidgow@google.com> Link: https://lkml.kernel.org/r/76eee17b6531ca8b3ca92b240cb2fd23204aaff7.1603129942.git.andreyknvl@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
834 lines
20 KiB
C
834 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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* Author: Andrey Ryabinin <a.ryabinin@samsung.com>
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/kasan.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/vmalloc.h>
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#include <asm/page.h>
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#include <kunit/test.h>
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#include "../mm/kasan/kasan.h"
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#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)
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/*
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* We assign some test results to these globals to make sure the tests
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* are not eliminated as dead code.
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*/
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void *kasan_ptr_result;
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int kasan_int_result;
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static struct kunit_resource resource;
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static struct kunit_kasan_expectation fail_data;
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static bool multishot;
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static int kasan_test_init(struct kunit *test)
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{
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/*
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* Temporarily enable multi-shot mode and set panic_on_warn=0.
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* Otherwise, we'd only get a report for the first case.
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*/
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multishot = kasan_save_enable_multi_shot();
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return 0;
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}
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static void kasan_test_exit(struct kunit *test)
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{
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kasan_restore_multi_shot(multishot);
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}
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/**
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* KUNIT_EXPECT_KASAN_FAIL() - Causes a test failure when the expression does
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* not cause a KASAN error. This uses a KUnit resource named "kasan_data." Do
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* Do not use this name for a KUnit resource outside here.
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*
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*/
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#define KUNIT_EXPECT_KASAN_FAIL(test, condition) do { \
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fail_data.report_expected = true; \
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fail_data.report_found = false; \
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kunit_add_named_resource(test, \
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NULL, \
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NULL, \
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&resource, \
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"kasan_data", &fail_data); \
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condition; \
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KUNIT_EXPECT_EQ(test, \
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fail_data.report_expected, \
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fail_data.report_found); \
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} while (0)
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static void kmalloc_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = 123;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 'x');
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kfree(ptr);
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}
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static void kmalloc_oob_left(struct kunit *test)
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{
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char *ptr;
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size_t size = 15;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1));
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kfree(ptr);
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}
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static void kmalloc_node_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = 4096;
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ptr = kmalloc_node(size, GFP_KERNEL, 0);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
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kfree(ptr);
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}
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static void kmalloc_pagealloc_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
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if (!IS_ENABLED(CONFIG_SLUB)) {
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kunit_info(test, "CONFIG_SLUB is not enabled.");
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return;
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}
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/* Allocate a chunk that does not fit into a SLUB cache to trigger
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* the page allocator fallback.
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*/
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0);
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kfree(ptr);
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}
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static void kmalloc_pagealloc_uaf(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
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if (!IS_ENABLED(CONFIG_SLUB)) {
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kunit_info(test, "CONFIG_SLUB is not enabled.");
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return;
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}
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0);
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}
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static void kmalloc_pagealloc_invalid_free(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
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if (!IS_ENABLED(CONFIG_SLUB)) {
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kunit_info(test, "CONFIG_SLUB is not enabled.");
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return;
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}
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1));
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}
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static void kmalloc_large_oob_right(struct kunit *test)
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{
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char *ptr;
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size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
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/* Allocate a chunk that is large enough, but still fits into a slab
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* and does not trigger the page allocator fallback in SLUB.
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*/
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
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kfree(ptr);
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}
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static void kmalloc_oob_krealloc_more(struct kunit *test)
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{
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char *ptr1, *ptr2;
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size_t size1 = 17;
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size_t size2 = 19;
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ptr1 = kmalloc(size1, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
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ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x');
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kfree(ptr2);
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}
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static void kmalloc_oob_krealloc_less(struct kunit *test)
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{
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char *ptr1, *ptr2;
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size_t size1 = 17;
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size_t size2 = 15;
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ptr1 = kmalloc(size1, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
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ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2 + OOB_TAG_OFF] = 'x');
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kfree(ptr2);
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}
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static void kmalloc_oob_16(struct kunit *test)
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{
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struct {
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u64 words[2];
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} *ptr1, *ptr2;
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/* This test is specifically crafted for the generic mode. */
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if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) {
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kunit_info(test, "CONFIG_KASAN_GENERIC required\n");
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return;
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}
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ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
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ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
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kfree(ptr1);
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kfree(ptr2);
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}
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static void kmalloc_uaf_16(struct kunit *test)
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{
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struct {
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u64 words[2];
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} *ptr1, *ptr2;
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ptr1 = kmalloc(sizeof(*ptr1), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
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ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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kfree(ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
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kfree(ptr1);
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}
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static void kmalloc_oob_memset_2(struct kunit *test)
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{
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char *ptr;
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size_t size = 8;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 7 + OOB_TAG_OFF, 0, 2));
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kfree(ptr);
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}
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static void kmalloc_oob_memset_4(struct kunit *test)
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{
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char *ptr;
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size_t size = 8;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 5 + OOB_TAG_OFF, 0, 4));
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kfree(ptr);
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}
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static void kmalloc_oob_memset_8(struct kunit *test)
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{
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char *ptr;
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size_t size = 8;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 8));
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kfree(ptr);
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}
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static void kmalloc_oob_memset_16(struct kunit *test)
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{
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char *ptr;
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size_t size = 16;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + 1 + OOB_TAG_OFF, 0, 16));
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kfree(ptr);
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}
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static void kmalloc_oob_in_memset(struct kunit *test)
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{
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char *ptr;
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size_t size = 666;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size + 5 + OOB_TAG_OFF));
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kfree(ptr);
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}
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static void kmalloc_memmove_invalid_size(struct kunit *test)
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{
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char *ptr;
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size_t size = 64;
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volatile size_t invalid_size = -2;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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memset((char *)ptr, 0, 64);
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KUNIT_EXPECT_KASAN_FAIL(test,
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memmove((char *)ptr, (char *)ptr + 4, invalid_size));
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kfree(ptr);
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}
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static void kmalloc_uaf(struct kunit *test)
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{
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char *ptr;
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size_t size = 10;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x');
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}
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static void kmalloc_uaf_memset(struct kunit *test)
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{
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char *ptr;
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size_t size = 33;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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kfree(ptr);
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KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size));
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}
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static void kmalloc_uaf2(struct kunit *test)
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{
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char *ptr1, *ptr2;
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size_t size = 43;
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ptr1 = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
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kfree(ptr1);
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ptr2 = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
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KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x');
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KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2);
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kfree(ptr2);
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}
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static void kfree_via_page(struct kunit *test)
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{
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char *ptr;
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size_t size = 8;
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struct page *page;
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unsigned long offset;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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page = virt_to_page(ptr);
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offset = offset_in_page(ptr);
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kfree(page_address(page) + offset);
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}
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static void kfree_via_phys(struct kunit *test)
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{
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char *ptr;
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size_t size = 8;
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phys_addr_t phys;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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phys = virt_to_phys(ptr);
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kfree(phys_to_virt(phys));
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}
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static void kmem_cache_oob(struct kunit *test)
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{
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char *p;
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size_t size = 200;
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struct kmem_cache *cache = kmem_cache_create("test_cache",
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size, 0,
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0, NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p) {
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kunit_err(test, "Allocation failed: %s\n", __func__);
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kmem_cache_destroy(cache);
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return;
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}
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KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
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kmem_cache_free(cache, p);
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kmem_cache_destroy(cache);
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}
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static void memcg_accounted_kmem_cache(struct kunit *test)
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{
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int i;
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char *p;
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size_t size = 200;
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struct kmem_cache *cache;
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cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
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/*
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* Several allocations with a delay to allow for lazy per memcg kmem
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* cache creation.
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*/
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for (i = 0; i < 5; i++) {
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p = kmem_cache_alloc(cache, GFP_KERNEL);
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if (!p)
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goto free_cache;
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kmem_cache_free(cache, p);
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msleep(100);
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}
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free_cache:
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kmem_cache_destroy(cache);
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}
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static char global_array[10];
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static void kasan_global_oob(struct kunit *test)
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{
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volatile int i = 3;
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char *p = &global_array[ARRAY_SIZE(global_array) + i];
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/* Only generic mode instruments globals. */
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if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) {
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kunit_info(test, "CONFIG_KASAN_GENERIC required");
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return;
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}
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KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
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}
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static void ksize_unpoisons_memory(struct kunit *test)
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{
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char *ptr;
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size_t size = 123, real_size;
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ptr = kmalloc(size, GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
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real_size = ksize(ptr);
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/* This access doesn't trigger an error. */
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ptr[size] = 'x';
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/* This one does. */
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KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y');
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kfree(ptr);
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}
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static void kasan_stack_oob(struct kunit *test)
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{
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char stack_array[10];
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volatile int i = OOB_TAG_OFF;
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char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
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if (!IS_ENABLED(CONFIG_KASAN_STACK)) {
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kunit_info(test, "CONFIG_KASAN_STACK is not enabled");
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return;
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}
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KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
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}
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static void kasan_alloca_oob_left(struct kunit *test)
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{
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volatile int i = 10;
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char alloca_array[i];
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char *p = alloca_array - 1;
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/* Only generic mode instruments dynamic allocas. */
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if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) {
|
|
kunit_info(test, "CONFIG_KASAN_GENERIC required");
|
|
return;
|
|
}
|
|
|
|
if (!IS_ENABLED(CONFIG_KASAN_STACK)) {
|
|
kunit_info(test, "CONFIG_KASAN_STACK is not enabled");
|
|
return;
|
|
}
|
|
|
|
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];
|
|
char *p = alloca_array + i;
|
|
|
|
/* Only generic mode instruments dynamic allocas. */
|
|
if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) {
|
|
kunit_info(test, "CONFIG_KASAN_GENERIC required");
|
|
return;
|
|
}
|
|
|
|
if (!IS_ENABLED(CONFIG_KASAN_STACK)) {
|
|
kunit_info(test, "CONFIG_KASAN_STACK is not enabled");
|
|
return;
|
|
}
|
|
|
|
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 kasan_memchr(struct kunit *test)
|
|
{
|
|
char *ptr;
|
|
size_t size = 24;
|
|
|
|
/* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */
|
|
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
|
|
kunit_info(test,
|
|
"str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT");
|
|
return;
|
|
}
|
|
|
|
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 void kasan_memcmp(struct kunit *test)
|
|
{
|
|
char *ptr;
|
|
size_t size = 24;
|
|
int arr[9];
|
|
|
|
/* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */
|
|
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
|
|
kunit_info(test,
|
|
"str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT");
|
|
return;
|
|
}
|
|
|
|
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));
|
|
|
|
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;
|
|
|
|
/* See https://bugzilla.kernel.org/show_bug.cgi?id=206337 */
|
|
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
|
|
kunit_info(test,
|
|
"str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT");
|
|
return;
|
|
}
|
|
|
|
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. */
|
|
if (!IS_ENABLED(CONFIG_KASAN_GENERIC)) {
|
|
kunit_info(test, "CONFIG_KASAN_GENERIC required\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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 the tag-based mode. */
|
|
if (IS_ENABLED(CONFIG_KASAN_GENERIC)) {
|
|
kunit_info(test, "CONFIG_KASAN_SW_TAGS required\n");
|
|
return;
|
|
}
|
|
|
|
/* Allocation size will be rounded to up granule size, which is 16. */
|
|
bits = kzalloc(sizeof(*bits), GFP_KERNEL);
|
|
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bits);
|
|
|
|
/* Do the accesses past the 16 allocated bytes. */
|
|
kasan_bitops_modify(test, BITS_PER_LONG, &bits[1]);
|
|
kasan_bitops_test_and_modify(test, BITS_PER_LONG + BITS_PER_BYTE, &bits[1]);
|
|
|
|
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;
|
|
|
|
if (!IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
|
|
kunit_info(test, "CONFIG_KASAN_VMALLOC is not enabled.");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
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(kmalloc_large_oob_right),
|
|
KUNIT_CASE(kmalloc_oob_krealloc_more),
|
|
KUNIT_CASE(kmalloc_oob_krealloc_less),
|
|
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(memcg_accounted_kmem_cache),
|
|
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(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),
|
|
{}
|
|
};
|
|
|
|
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");
|