On Wed, Apr 1, 2020 at 8:09 PM Patricia Alfonso trishalfonso@google.com wrote:

Integrate KASAN into KUnit testing framework. - Fail tests when KASAN reports an error that is not expected - Use KUNIT_EXPECT_KASAN_FAIL to expect a KASAN error in KASAN tests - Expected KASAN reports pass tests and are still printed when run without kunit_tool (kunit_tool still bypasses the report due to the test passing) - KUnit struct in current task used to keep track of the current test from KASAN code

Make use of "[PATCH v3 kunit-next 1/2] kunit: generalize kunit_resource API beyond allocated resources" and "[PATCH v3 kunit-next 2/2] kunit: add support for named resources" from Alan Maguire [1] - A named resource is added to a test when a KASAN report is expected - This resource contains a struct for kasan_data containing booleans representing if a KASAN report is expected and if a KASAN report is found

[1] (https://lore.kernel.org/linux-kselftest/1583251361-12748-1-git-send-email-al...)

Signed-off-by: Patricia Alfonso trishalfonso@google.com

Reviewed-by: Dmitry Vyukov dvyukov@google.com

---

include/kunit/test.h | 5 +++++ include/linux/kasan.h | 6 ++++++ lib/kunit/test.c | 13 ++++++++----- lib/test_kasan.c | 37 +++++++++++++++++++++++++++++++++++++ mm/kasan/report.c | 33 +++++++++++++++++++++++++++++++++ 5 files changed, 89 insertions(+), 5 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h index ac59d18e6bab..1dc3d118f64b 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -225,6 +225,11 @@ struct kunit { struct list_head resources; /* Protected by lock. */ };

+static inline void kunit_set_failure(struct kunit *test) +{

•   WRITE_ONCE(test->success, false);
  

+}

void kunit_init_test(struct kunit *test, const char *name, char *log);

int kunit_run_tests(struct kunit_suite *suite); diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 5cde9e7c2664..148eaef3e003 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -14,6 +14,12 @@ struct task_struct; #include <asm/kasan.h> #include <asm/pgtable.h>

+/* kasan_data struct is used in KUnit tests for KASAN expected failures */ +struct kunit_kasan_expectation {

•   bool report_expected;
  

•   bool report_found;
  

+};

extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 2cb7c6220a00..030a3281591e 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -10,16 +10,12 @@ #include <linux/kernel.h> #include <linux/kref.h> #include <linux/sched/debug.h> +#include <linux/sched.h>

#include "debugfs.h" #include "string-stream.h" #include "try-catch-impl.h"

-static void kunit_set_failure(struct kunit *test) -{

•   WRITE_ONCE(test->success, false);
  

-}

static void kunit_print_tap_version(void) { static bool kunit_has_printed_tap_version; @@ -288,6 +284,10 @@ static void kunit_try_run_case(void *data) struct kunit_suite *suite = ctx->suite; struct kunit_case *test_case = ctx->test_case;

+#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))

•   current->kunit_test = test;
  

+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT) */

•   /*
     * kunit_run_case_internal may encounter a fatal error; if it does,
     * abort will be called, this thread will exit, and finally the parent
  

@@ -603,6 +603,9 @@ void kunit_cleanup(struct kunit *test) spin_unlock(&test->lock); kunit_remove_resource(test, res); } +#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))

•   current->kunit_test = NULL;
  

+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT)*/ } EXPORT_SYMBOL_GPL(kunit_cleanup);

diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 3872d250ed2c..cf73c6bee81b 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -23,6 +23,43 @@

#include <asm/page.h>

+#include <kunit/test.h>

+struct kunit_resource resource; +struct kunit_kasan_expectation fail_data;

+#define KUNIT_SET_KASAN_DATA(test) do { \

•   fail_data.report_expected = true; \
  

•   fail_data.report_found = false; \
  

•   kunit_add_named_resource(test, \
  

•                           NULL, \
  

•                           NULL, \
  

•                           &resource, \
  

•                           "kasan_data", &fail_data); \
  

+} while (0)

+#define KUNIT_DO_EXPECT_KASAN_FAIL(test, condition) do { \

•   struct kunit_resource *resource; \
  

•   struct kunit_kasan_expectation *kasan_data; \
  

•   condition; \
  

•   resource = kunit_find_named_resource(test, "kasan_data"); \
  

•   kasan_data = resource->data; \
  

•   KUNIT_EXPECT_EQ(test, \
  

•                   kasan_data->report_expected, \
  

•                   kasan_data->report_found); \
  

•   kunit_put_resource(resource); \
  

+} while (0)

+/**

• • KUNIT_EXPECT_KASAN_FAIL() - Causes a test failure when the expression does
• • not cause a KASAN error.
• */

+#define KUNIT_EXPECT_KASAN_FAIL(test, condition) do { \

•   KUNIT_SET_KASAN_DATA(test); \
  

•   KUNIT_DO_EXPECT_KASAN_FAIL(test, condition); \
  

+} while (0)

/*

• Note: test functions are marked noinline so that their names appear in
• reports.

diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 5ef9f24f566b..87330ef3a99a 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -32,6 +32,8 @@

#include <asm/sections.h>

+#include <kunit/test.h>

#include "kasan.h" #include "../slab.h"

@@ -455,12 +457,38 @@ static bool report_enabled(void) return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags); }

+#if IS_ENABLED(CONFIG_KUNIT) +void kasan_update_kunit_status(struct kunit *cur_test) +{

•   struct kunit_resource *resource;
  

•   struct kunit_kasan_expectation *kasan_data;
  

•   if (kunit_find_named_resource(cur_test, "kasan_data")) {
  

•           resource = kunit_find_named_resource(cur_test, "kasan_data");
  

•           kasan_data = resource->data;
  

•           kasan_data->report_found = true;
  

•           if (!kasan_data->report_expected)
  

•                   kunit_set_failure(current->kunit_test);
  

•           else
  

•                   return;
  

•   } else
  

•           kunit_set_failure(current->kunit_test);
  

+} +#endif /* IS_ENABLED(CONFIG_KUNIT) */

void kasan_report_invalid_free(void *object, unsigned long ip) { unsigned long flags; u8 tag = get_tag(object);

    object = reset_tag(object);

+#if IS_ENABLED(CONFIG_KUNIT)

•   if (current->kunit_test)
  

•           kasan_update_kunit_status(current->kunit_test);
  

+#endif /* IS_ENABLED(CONFIG_KUNIT) */

•   start_report(&flags);
    pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
    print_tags(tag, object);
  

@@ -481,6 +509,11 @@ void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned lon if (likely(!report_enabled())) return;

+#if IS_ENABLED(CONFIG_KUNIT)

•   if (current->kunit_test)
  

•           kasan_update_kunit_status(current->kunit_test);
  

+#endif /* IS_ENABLED(CONFIG_KUNIT) */

•   disable_trace_on_warning();
  
    tagged_addr = (void *)addr;
  

-- 2.26.0.rc2.310.g2932bb562d-goog

On Thu, Apr 2, 2020 at 8:54 AM Andrey Konovalov andreyknvl@google.com wrote:

On Wed, Apr 1, 2020 at 8:09 PM 'Patricia Alfonso' via kasan-dev kasan-dev@googlegroups.com wrote:

...

Integrate KASAN into KUnit testing framework. - Fail tests when KASAN reports an error that is not expected - Use KUNIT_EXPECT_KASAN_FAIL to expect a KASAN error in KASAN tests - Expected KASAN reports pass tests and are still printed when run without kunit_tool (kunit_tool still bypasses the report due to the test passing) - KUnit struct in current task used to keep track of the current test from KASAN code

Make use of "[PATCH v3 kunit-next 1/2] kunit: generalize kunit_resource API beyond allocated resources" and "[PATCH v3 kunit-next 2/2] kunit: add support for named resources" from Alan Maguire [1] - A named resource is added to a test when a KASAN report is expected - This resource contains a struct for kasan_data containing booleans representing if a KASAN report is expected and if a KASAN report is found

[1] (https://lore.kernel.org/linux-kselftest/1583251361-12748-1-git-send-email-al...)

Signed-off-by: Patricia Alfonso trishalfonso@google.com

include/kunit/test.h | 5 +++++ include/linux/kasan.h | 6 ++++++ lib/kunit/test.c | 13 ++++++++----- lib/test_kasan.c | 37 +++++++++++++++++++++++++++++++++++++ mm/kasan/report.c | 33 +++++++++++++++++++++++++++++++++ 5 files changed, 89 insertions(+), 5 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h index ac59d18e6bab..1dc3d118f64b 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -225,6 +225,11 @@ struct kunit { struct list_head resources; /* Protected by lock. */ };

+static inline void kunit_set_failure(struct kunit *test) +{

•   WRITE_ONCE(test->success, false);
  

+}

void kunit_init_test(struct kunit *test, const char *name, char *log);

int kunit_run_tests(struct kunit_suite *suite); diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 5cde9e7c2664..148eaef3e003 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -14,6 +14,12 @@ struct task_struct; #include <asm/kasan.h> #include <asm/pgtable.h>

+/* kasan_data struct is used in KUnit tests for KASAN expected failures */ +struct kunit_kasan_expectation {

•   bool report_expected;
  

•   bool report_found;
  

+};

extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 2cb7c6220a00..030a3281591e 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -10,16 +10,12 @@ #include <linux/kernel.h> #include <linux/kref.h> #include <linux/sched/debug.h> +#include <linux/sched.h>

#include "debugfs.h" #include "string-stream.h" #include "try-catch-impl.h"

-static void kunit_set_failure(struct kunit *test) -{

•   WRITE_ONCE(test->success, false);
  

-}

static void kunit_print_tap_version(void) { static bool kunit_has_printed_tap_version; @@ -288,6 +284,10 @@ static void kunit_try_run_case(void *data) struct kunit_suite *suite = ctx->suite; struct kunit_case *test_case = ctx->test_case;

+#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))

•   current->kunit_test = test;
  

+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT) */

•   /*
     * kunit_run_case_internal may encounter a fatal error; if it does,
     * abort will be called, this thread will exit, and finally the parent
  

@@ -603,6 +603,9 @@ void kunit_cleanup(struct kunit *test) spin_unlock(&test->lock); kunit_remove_resource(test, res); } +#if (IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT))

•   current->kunit_test = NULL;
  

+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_ENABLED(CONFIG_KUNIT)*/ } EXPORT_SYMBOL_GPL(kunit_cleanup);

diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 3872d250ed2c..cf73c6bee81b 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -23,6 +23,43 @@

#include <asm/page.h>

+#include <kunit/test.h>

+struct kunit_resource resource; +struct kunit_kasan_expectation fail_data;

+#define KUNIT_SET_KASAN_DATA(test) do { \

•   fail_data.report_expected = true; \
  

•   fail_data.report_found = false; \
  

•   kunit_add_named_resource(test, \
  

•                           NULL, \
  

•                           NULL, \
  

•                           &resource, \
  

•                           "kasan_data", &fail_data); \
  

+} while (0)

+#define KUNIT_DO_EXPECT_KASAN_FAIL(test, condition) do { \

•   struct kunit_resource *resource; \
  

•   struct kunit_kasan_expectation *kasan_data; \
  

•   condition; \
  

•   resource = kunit_find_named_resource(test, "kasan_data"); \
  

•   kasan_data = resource->data; \
  

•   KUNIT_EXPECT_EQ(test, \
  

•                   kasan_data->report_expected, \
  

•                   kasan_data->report_found); \
  

•   kunit_put_resource(resource); \
  

+} while (0)

+/**

• • KUNIT_EXPECT_KASAN_FAIL() - Causes a test failure when the expression does
• • not cause a KASAN error.
• */

+#define KUNIT_EXPECT_KASAN_FAIL(test, condition) do { \

•   KUNIT_SET_KASAN_DATA(test); \
  

•   KUNIT_DO_EXPECT_KASAN_FAIL(test, condition); \
  

+} while (0)

Any reason to split this macro into two parts? Do we call any of them separately?

They are not called anywhere else... honestly, it was just a style choice to make it clear that there are 2 parts to the expectation. I don't think they have to be split if there's enough reason to smash them together.

...

/*

• Note: test functions are marked noinline so that their names appear in
• reports.

diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 5ef9f24f566b..87330ef3a99a 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -32,6 +32,8 @@

#include <asm/sections.h>

+#include <kunit/test.h>

#include "kasan.h" #include "../slab.h"

@@ -455,12 +457,38 @@ static bool report_enabled(void) return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags); }

+#if IS_ENABLED(CONFIG_KUNIT) +void kasan_update_kunit_status(struct kunit *cur_test) +{

•   struct kunit_resource *resource;
  

•   struct kunit_kasan_expectation *kasan_data;
  

•   if (kunit_find_named_resource(cur_test, "kasan_data")) {
  

•           resource = kunit_find_named_resource(cur_test, "kasan_data");
  

•           kasan_data = resource->data;
  

•           kasan_data->report_found = true;
  

•           if (!kasan_data->report_expected)
  

•                   kunit_set_failure(current->kunit_test);
  

Hm, we only call KUNIT_SET_KASAN_DATA() for KASAN tests that we expect to fail AFAICS. Then we end up calling kunit_set_failure twice, once here and the other time when we do KUNIT_EXPECT_EQ() in KUNIT_DO_EXPECT_KASAN_FAIL(). Or maybe there's something I misunderstand.

You are right. I didn't realize, but yes. If the report_expected is false, KUNIT_DO_EXPECT_KASAN_FAIL() will set the test failure in KUNIT_EXPECT_EQ(). I think this is just leftover logic from before I thought to use KUNIT_EXPECT_EQ().

...

•           else
  

•                   return;
  

Nit: "else return;" can be dropped.

You can actually reorder the code a bit to make it easier to read:

if (!kunit_find_named_resource(cur_test, "kasan_data")) { kunit_set_failure(current->kunit_test); return; } // here comes kasan tests checks

I agree. This looks much cleaner. The thing to note is that anyone can add a named resource to a test. I doubt anyone will name their resource "kasan_data" outside of this file, but it may be worth adding a comment advising against it.

...

•   } else
  

•           kunit_set_failure(current->kunit_test);
  

+} +#endif /* IS_ENABLED(CONFIG_KUNIT) */

void kasan_report_invalid_free(void *object, unsigned long ip) { unsigned long flags; u8 tag = get_tag(object);

    object = reset_tag(object);

+#if IS_ENABLED(CONFIG_KUNIT)

•   if (current->kunit_test)
  

•           kasan_update_kunit_status(current->kunit_test);
  

+#endif /* IS_ENABLED(CONFIG_KUNIT) */

•   start_report(&flags);
    pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
    print_tags(tag, object);
  

@@ -481,6 +509,11 @@ void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned lon if (likely(!report_enabled())) return;

+#if IS_ENABLED(CONFIG_KUNIT)

•   if (current->kunit_test)
  

•           kasan_update_kunit_status(current->kunit_test);
  

+#endif /* IS_ENABLED(CONFIG_KUNIT) */

•   disable_trace_on_warning();
  
    tagged_addr = (void *)addr;
  

--

Thanks for the comments!

Best, Patricia

On Wed, Apr 1, 2020 at 8:09 PM Patricia Alfonso trishalfonso@google.com wrote:

Transfer all previous tests for KASAN to KUnit so they can be run more easily. Using kunit_tool, developers can run these tests with their other KUnit tests and see "pass" or "fail" with the appropriate KASAN report instead of needing to parse each KASAN report to test KASAN functionalities. All KASAN reports are still printed to dmesg.

Stack tests do not work properly when KASAN_STACK is enabled so those tests use a check for "if IS_ENABLED(CONFIG_KASAN_STACK)" so they only run if stack instrumentation is enabled. If KASAN_STACK is not enabled, KUnit will print a statement to let the user know this test was not run with KASAN_STACK enabled.

copy_user_test cannot be run in KUnit so there is a separate test file for those tests, which can be run as before as a module.

Signed-off-by: Patricia Alfonso trishalfonso@google.com

lib/Kconfig.kasan | 15 +- lib/Makefile | 3 +- lib/test_kasan.c | 657 +++++++++++++++++----------------------- lib/test_kasan_module.c | 76 +++++ 4 files changed, 362 insertions(+), 389 deletions(-) create mode 100644 lib/test_kasan_module.c

diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 81f5464ea9e1..c969ceb4586b 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -158,10 +158,17 @@ config KASAN_VMALLOC for KASAN to detect more sorts of errors (and to support vmapped stacks), but at the cost of higher memory usage.

-config TEST_KASAN

•   tristate "Module for testing KASAN for bug detection"
  

•   depends on m && KASAN
  

+config TEST_KASAN_KUNIT

•   tristate "KUnit testing KASAN for bug detection"
  

•   depends on KASAN && KUNIT
    help
  

•     This is a test module doing various nasty things like
  

•     This is a test suite doing various nasty things like
      out of bounds accesses, use after free. It is useful for testing
      kernel debugging features like KASAN.
  

+config TEST_KASAN_MODULE

•   tristate "Module testing KASAN for bug detection on copy user tests"
  

•   depends on m && KASAN
  

•   help
  

•     This is a test module for functions which cannot be tested by
  

•     KUnit, like copy_user_tests.
  

diff --git a/lib/Makefile b/lib/Makefile index 611872c06926..60e125555271 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -59,9 +59,10 @@ obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o obj-$(CONFIG_TEST_IDA) += test_ida.o -obj-$(CONFIG_TEST_KASAN) += test_kasan.o +obj-$(CONFIG_TEST_KASAN_KUNIT) += test_kasan.o CFLAGS_test_kasan.o += -fno-builtin CFLAGS_test_kasan.o += $(call cc-disable-warning, vla) +obj-$(CONFIG_TEST_KASAN_MODULE) += test_kasan_module.o obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla) UBSAN_SANITIZE_test_ubsan.o := y diff --git a/lib/test_kasan.c b/lib/test_kasan.c index cf73c6bee81b..87f8b4ce244f 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -5,8 +5,6 @@

• Author: Andrey Ryabinin a.ryabinin@samsung.com

*/

-#define pr_fmt(fmt) "kasan test: %s " fmt, __func__

#include <linux/bitops.h> #include <linux/delay.h> #include <linux/kasan.h> @@ -25,8 +23,33 @@

#include <kunit/test.h>

-struct kunit_resource resource; -struct kunit_kasan_expectation fail_data; +static struct kunit_resource resource; +static struct kunit_kasan_expectation fail_data; +static bool multishot; +static int orig_panic_on_warn; +int panic_on_warn;

This should be 'extern'. But panic_on_warn is already declared in <linux/kernel.h>, it's better to include it instead, if we don't yet.

With this nit:

Reviewed-by: Dmitry Vyukov dvyukov@google.com

+static int kasan_test_init(struct kunit *test) +{

•   /*
  

•    * Temporarily enable multi-shot mode and set panic_on_warn=0.
  

•    * Otherwise, we'd only get a report for the first case.
  

•    */
  

•   multishot = kasan_save_enable_multi_shot();
  

•   orig_panic_on_warn = panic_on_warn;
  

•   panic_on_warn = 0;
  

•   return 0;
  

+}

+static void kasan_test_exit(struct kunit *test) +{

•   kasan_restore_multi_shot(multishot);
  

•   /* Restore panic_on_warn */
  

•   panic_on_warn = orig_panic_on_warn;
  

+}

#define KUNIT_SET_KASAN_DATA(test) do { \ fail_data.report_expected = true; \ @@ -60,386 +83,311 @@ struct kunit_kasan_expectation fail_data; KUNIT_DO_EXPECT_KASAN_FAIL(test, condition); \ } while (0)

-/*

• • Note: test functions are marked noinline so that their names appear in
• • reports.
• */

-static noinline void __init kmalloc_oob_right(void) +static void kmalloc_oob_right(struct kunit *test) { char *ptr; size_t size = 123;

•   pr_info("out-of-bounds to right\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   ptr[size] = 'x';
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 'x');
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_left(void) +static void kmalloc_oob_left(struct kunit *test) { char *ptr; size_t size = 15;

•   pr_info("out-of-bounds to left\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   *ptr = *(ptr - 1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *ptr = *(ptr - 1));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_node_oob_right(void) +static void kmalloc_node_oob_right(struct kunit *test) { char *ptr; size_t size = 4096;

•   pr_info("kmalloc_node(): out-of-bounds to right\n");
    ptr = kmalloc_node(size, GFP_KERNEL, 0);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   ptr[size] = 0;
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
    kfree(ptr);
  

}

-#ifdef CONFIG_SLUB -static noinline void __init kmalloc_pagealloc_oob_right(void) +static void kmalloc_pagealloc_oob_right(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10;

•   if (!IS_ENABLED(CONFIG_SLUB)) {
  

•           kunit_info(test, "CONFIG_SLUB is not enabled.");
  

This is nice.

•           return;
  

•   }
  

•   /* Allocate a chunk that does not fit into a SLUB cache to trigger
     * the page allocator fallback.
     */
  

•   pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   ptr[size] = 0;
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
    kfree(ptr);
  

}

-static noinline void __init kmalloc_pagealloc_uaf(void) +static void kmalloc_pagealloc_uaf(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10;

•   pr_info("kmalloc pagealloc allocation: use-after-free\n");
  

•   ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•   if (!IS_ENABLED(CONFIG_SLUB)) {
  

•           kunit_info(test, "CONFIG_SLUB is not enabled.");
            return;
    }
  
  

•   ptr = kmalloc(size, GFP_KERNEL);
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  

•   kfree(ptr);
  

•   ptr[0] = 0;
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] = 0);
  

}

-static noinline void __init kmalloc_pagealloc_invalid_free(void) +static void kmalloc_pagealloc_invalid_free(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE + 10;

•   pr_info("kmalloc pagealloc allocation: invalid-free\n");
  

•   ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•   if (!IS_ENABLED(CONFIG_SLUB)) {
  

•           kunit_info(test, "CONFIG_SLUB is not enabled.");
            return;
    }
  
  

•   kfree(ptr + 1);
  

•   ptr = kmalloc(size, GFP_KERNEL);
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, kfree(ptr + 1));
  

} -#endif

-static noinline void __init kmalloc_large_oob_right(void) +static void kmalloc_large_oob_right(struct kunit *test) { char *ptr; size_t size = KMALLOC_MAX_CACHE_SIZE - 256; /* Allocate a chunk that is large enough, but still fits into a slab * and does not trigger the page allocator fallback in SLUB. */

•   pr_info("kmalloc large allocation: out-of-bounds to right\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   ptr[size] = 0;
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = 0);
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_krealloc_more(void) +static void kmalloc_oob_krealloc_more(struct kunit *test) { char *ptr1, *ptr2; size_t size1 = 17; size_t size2 = 19;

•   pr_info("out-of-bounds after krealloc more\n");
    ptr1 = kmalloc(size1, GFP_KERNEL);
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
  

•   ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
  

•   if (!ptr1 || !ptr2) {
  

•           pr_err("Allocation failed\n");
  

•           kfree(ptr1);
  

•           kfree(ptr2);
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
  
  

•   ptr2[size2] = 'x';
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
    kfree(ptr2);
  

}

-static noinline void __init kmalloc_oob_krealloc_less(void) +static void kmalloc_oob_krealloc_less(struct kunit *test) { char *ptr1, *ptr2; size_t size1 = 17; size_t size2 = 15;

•   pr_info("out-of-bounds after krealloc less\n");
    ptr1 = kmalloc(size1, GFP_KERNEL);
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
  

•   ptr2 = krealloc(ptr1, size2, GFP_KERNEL);
  

•   if (!ptr1 || !ptr2) {
  

•           pr_err("Allocation failed\n");
  

•           kfree(ptr1);
  

•           return;
  

•   }
  

•   ptr2[size2] = 'x';
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
    kfree(ptr2);
  

}

-static noinline void __init kmalloc_oob_16(void) +static void kmalloc_oob_16(struct kunit *test) { struct { u64 words[2]; } *ptr1, *ptr2;

•   pr_info("kmalloc out-of-bounds for 16-bytes access\n");
    ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL);
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
  

•   ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL);
  

•   if (!ptr1 || !ptr2) {
  

•           pr_err("Allocation failed\n");
  

•           kfree(ptr1);
  

•           kfree(ptr2);
  

•           return;
  

•   }
  

•   *ptr1 = *ptr2;
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 = *ptr2);
    kfree(ptr1);
    kfree(ptr2);
  

}

-static noinline void __init kmalloc_oob_memset_2(void) +static void kmalloc_oob_memset_2(struct kunit *test) { char *ptr; size_t size = 8;

•   pr_info("out-of-bounds in memset2\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   memset(ptr+7, 0, 2);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr+7, 0, 2));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_memset_4(void) +static void kmalloc_oob_memset_4(struct kunit *test) { char *ptr; size_t size = 8;

•   pr_info("out-of-bounds in memset4\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   memset(ptr+5, 0, 4);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr+5, 0, 4));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_memset_8(void) +static void kmalloc_oob_memset_8(struct kunit *test) { char *ptr; size_t size = 8;

•   pr_info("out-of-bounds in memset8\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   memset(ptr+1, 0, 8);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr+1, 0, 8));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_memset_16(void) +static void kmalloc_oob_memset_16(struct kunit *test) { char *ptr; size_t size = 16;

•   pr_info("out-of-bounds in memset16\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   memset(ptr+1, 0, 16);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr+1, 0, 16));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_oob_in_memset(void) +static void kmalloc_oob_in_memset(struct kunit *test) { char *ptr; size_t size = 666;

•   pr_info("out-of-bounds in memset\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
  

•   memset(ptr, 0, size+5);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size+5));
    kfree(ptr);
  

}

-static noinline void __init kmalloc_uaf(void) +static void kmalloc_uaf(struct kunit *test) { char *ptr; size_t size = 10;

•   pr_info("use-after-free\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
    kfree(ptr);
  

•   *(ptr + 8) = 'x';
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *(ptr + 8) = 'x');
  

}

-static noinline void __init kmalloc_uaf_memset(void) +static void kmalloc_uaf_memset(struct kunit *test) { char *ptr; size_t size = 33;

•   pr_info("use-after-free in memset\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
    kfree(ptr);
  

•   memset(ptr, 0, size);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr, 0, size));
  

}

-static noinline void __init kmalloc_uaf2(void) +static void kmalloc_uaf2(struct kunit *test) { char *ptr1, *ptr2; size_t size = 43;

•   pr_info("use-after-free after another kmalloc\n");
    ptr1 = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr1) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1);
  
    kfree(ptr1);
  

•   ptr2 = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr2) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr1[40] = 'x');
  

•   KUNIT_EXPECT_PTR_NE(test, ptr1, ptr2);
  
  

•   ptr1[40] = 'x';
  

•   if (ptr1 == ptr2)
  

•           pr_err("Could not detect use-after-free: ptr1 == ptr2\n");
    kfree(ptr2);
  

}

-static noinline void __init kfree_via_page(void) +static void kfree_via_page(struct kunit *test) { char *ptr; size_t size = 8; struct page *page; unsigned long offset;

•   pr_info("invalid-free false positive (via page)\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
    page = virt_to_page(ptr);
    offset = offset_in_page(ptr);
    kfree(page_address(page) + offset);
  

}

-static noinline void __init kfree_via_phys(void) +static void kfree_via_phys(struct kunit *test) { char *ptr; size_t size = 8; phys_addr_t phys;

•   pr_info("invalid-free false positive (via phys)\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
    phys = virt_to_phys(ptr);
    kfree(phys_to_virt(phys));
  

}

-static noinline void __init kmem_cache_oob(void) +static void kmem_cache_oob(struct kunit *test) { char *p; size_t size = 200; struct kmem_cache *cache = kmem_cache_create("test_cache", size, 0, 0, NULL);

•   if (!cache) {
  

•           pr_err("Cache allocation failed\n");
  

•           return;
  

•   }
  

•   pr_info("out-of-bounds in kmem_cache_alloc\n");
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
    p = kmem_cache_alloc(cache, GFP_KERNEL);
    if (!p) {
  

•           pr_err("Allocation failed\n");
  

•           kunit_err(test, "Allocation failed: %s\n", __func__);
            kmem_cache_destroy(cache);
            return;
    }
  
  

•   *p = p[size];
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size]);
    kmem_cache_free(cache, p);
    kmem_cache_destroy(cache);
  

}

-static noinline void __init memcg_accounted_kmem_cache(void) +static void memcg_accounted_kmem_cache(struct kunit *test) { int i; char *p; @@ -447,12 +395,8 @@ static noinline void __init memcg_accounted_kmem_cache(void) struct kmem_cache *cache;

    cache = kmem_cache_create("test_cache", size, 0, SLAB_ACCOUNT, NULL);

•   if (!cache) {
  

•           pr_err("Cache allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
  
  

•   pr_info("allocate memcg accounted object\n");
    /*
     * Several allocations with a delay to allow for lazy per memcg kmem
     * cache creation.
  

@@ -472,134 +416,93 @@ static noinline void __init memcg_accounted_kmem_cache(void)

static char global_array[10];

-static noinline void __init kasan_global_oob(void) +static void kasan_global_oob(struct kunit *test) { volatile int i = 3; char *p = &global_array[ARRAY_SIZE(global_array) + i];

•   pr_info("out-of-bounds global variable\n");
  

•   *(volatile char *)p;
  

-}

-static noinline void __init kasan_stack_oob(void) -{

•   char stack_array[10];
  

•   volatile int i = 0;
  

•   char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
  

•   pr_info("out-of-bounds on stack\n");
  

•   *(volatile char *)p;
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
  

}

-static noinline void __init ksize_unpoisons_memory(void) +static void ksize_unpoisons_memory(struct kunit *test) { char *ptr; size_t size = 123, real_size;

•   pr_info("ksize() unpoisons the whole allocated chunk\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
    real_size = ksize(ptr);
    /* This access doesn't trigger an error. */
    ptr[size] = 'x';
    /* This one does. */
  

•   ptr[real_size] = 'y';
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ptr[real_size] = 'y');
    kfree(ptr);
  

}

-static noinline void __init copy_user_test(void) +static void kasan_stack_oob(struct kunit *test) {

•   char *kmem;
  

•   char __user *usermem;
  

•   size_t size = 10;
  

•   int unused;
  

•   kmem = kmalloc(size, GFP_KERNEL);
  

•   if (!kmem)
  

•           return;
  

•   char stack_array[10];
  

•   volatile int i = 0;
  

•   char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
  
  

•   usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
  

•                       PROT_READ | PROT_WRITE | PROT_EXEC,
  

•                       MAP_ANONYMOUS | MAP_PRIVATE, 0);
  

•   if (IS_ERR(usermem)) {
  

•           pr_err("Failed to allocate user memory\n");
  

•           kfree(kmem);
  

•   if (!IS_ENABLED(CONFIG_KASAN_STACK)) {
  

•           kunit_info(test, "CONFIG_KASAN_STACK is not enabled");
            return;
    }
  
  

•   pr_info("out-of-bounds in copy_from_user()\n");
  

•   unused = copy_from_user(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in copy_to_user()\n");
  

•   unused = copy_to_user(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in __copy_from_user()\n");
  

•   unused = __copy_from_user(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in __copy_to_user()\n");
  

•   unused = __copy_to_user(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
  

•   unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
  

•   unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in strncpy_from_user()\n");
  

•   unused = strncpy_from_user(kmem, usermem, size + 1);
  

•   vm_munmap((unsigned long)usermem, PAGE_SIZE);
  

•   kfree(kmem);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
  

}

-static noinline void __init kasan_alloca_oob_left(void) +static void kasan_alloca_oob_left(struct kunit *test) { volatile int i = 10; char alloca_array[i]; char *p = alloca_array - 1;

•   pr_info("out-of-bounds to left on alloca\n");
  

•   *(volatile char *)p;
  

•   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 noinline void __init kasan_alloca_oob_right(void) +static void kasan_alloca_oob_right(struct kunit *test) { volatile int i = 10; char alloca_array[i]; char *p = alloca_array + i;

•   pr_info("out-of-bounds to right on alloca\n");
  

•   *(volatile char *)p;
  

•   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 noinline void __init kmem_cache_double_free(void) +static void kmem_cache_double_free(struct kunit *test) { char *p; size_t size = 200; struct kmem_cache *cache;

    cache = kmem_cache_create("test_cache", size, 0, 0, NULL);

•   if (!cache) {
  

•           pr_err("Cache allocation failed\n");
  

•           return;
  

•   }
  

•   pr_info("double-free on heap object\n");
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
  

•   p = kmem_cache_alloc(cache, GFP_KERNEL);
    if (!p) {
  

•           pr_err("Allocation failed\n");
  

•           kunit_err(test, "Allocation failed: %s\n", __func__);
            kmem_cache_destroy(cache);
            return;
    }
  
    kmem_cache_free(cache, p);
  

•   kmem_cache_free(cache, p);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p));
    kmem_cache_destroy(cache);
  

}

-static noinline void __init kmem_cache_invalid_free(void) +static void kmem_cache_invalid_free(struct kunit *test) { char *p; size_t size = 200; @@ -607,20 +510,17 @@ static noinline void __init kmem_cache_invalid_free(void)

    cache = kmem_cache_create("test_cache", size, 0, SLAB_TYPESAFE_BY_RCU,
                              NULL);

•   if (!cache) {
  

•           pr_err("Cache allocation failed\n");
  

•           return;
  

•   }
  

•   pr_info("invalid-free of heap object\n");
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
  

•   p = kmem_cache_alloc(cache, GFP_KERNEL);
    if (!p) {
  

•           pr_err("Allocation failed\n");
  

•           kunit_err(test, "Allocation failed: %s\n", __func__);
            kmem_cache_destroy(cache);
            return;
    }
  
    /* Trigger invalid free, the object doesn't get freed */
  

•   kmem_cache_free(cache, p + 1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_free(cache, p + 1));
  
    /*
     * Properly free the object to prevent the "Objects remaining in
  

@@ -631,45 +531,60 @@ static noinline void __init kmem_cache_invalid_free(void) kmem_cache_destroy(cache); }

-static noinline void __init kasan_memchr(void) +static void kasan_memchr(struct kunit *test) { char *ptr; size_t size = 24;

•   pr_info("out-of-bounds in memchr\n");
  

•   ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
  

•   if (!ptr)
  

•   // 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);
  
  

•   memchr(ptr, '1', size + 1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memchr(ptr, '1', size + 1));
    kfree(ptr);
  

}

-static noinline void __init kasan_memcmp(void) +static void kasan_memcmp(struct kunit *test) { char *ptr; size_t size = 24; int arr[9];

•   pr_info("out-of-bounds in memcmp\n");
  

•   ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
  

•   if (!ptr)
  

•   // 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);
  
    memset(arr, 0, sizeof(arr));
  

•   memcmp(ptr, arr, size+1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, memcmp(ptr, arr, size+1));
    kfree(ptr);
  

}

-static noinline void __init kasan_strings(void) +static void kasan_strings(struct kunit *test) { char *ptr; size_t size = 24;

•   pr_info("use-after-free in strchr\n");
  

•   ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
  

•   if (!ptr)
  

•   // 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);
  
  

@@ -680,188 +595,162 @@ static noinline void __init kasan_strings(void) * will likely point to zeroed byte. */ ptr += 16;

•   strchr(ptr, '1');
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strchr(ptr, '1'));
  
  

•   pr_info("use-after-free in strrchr\n");
  

•   strrchr(ptr, '1');
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strrchr(ptr, '1'));
  
  

•   pr_info("use-after-free in strcmp\n");
  

•   strcmp(ptr, "2");
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strcmp(ptr, "2"));
  
  

•   pr_info("use-after-free in strncmp\n");
  

•   strncmp(ptr, "2", 1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strncmp(ptr, "2", 1));
  
  

•   pr_info("use-after-free in strlen\n");
  

•   strlen(ptr);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strlen(ptr));
  
  

•   pr_info("use-after-free in strnlen\n");
  

•   strnlen(ptr, 1);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, strnlen(ptr, 1));
  

}

-static noinline void __init kasan_bitops(void) +static void kasan_bitops(struct kunit *test) { /* * Allocate 1 more byte, which causes kzalloc to round up to 16-bytes; * this way we do not actually corrupt other memory. */ long *bits = kzalloc(sizeof(*bits) + 1, GFP_KERNEL);

•   if (!bits)
  

•           return;
  

•   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.
     */
  

•   pr_info("out-of-bounds in set_bit\n");
  

•   set_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, set_bit(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in __set_bit\n");
  

•   __set_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, __set_bit(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in clear_bit\n");
  

•   clear_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, clear_bit(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in __clear_bit\n");
  

•   __clear_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in clear_bit_unlock\n");
  

•   clear_bit_unlock(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, clear_bit_unlock(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in __clear_bit_unlock\n");
  

•   __clear_bit_unlock(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, __clear_bit_unlock(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in change_bit\n");
  

•   change_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, change_bit(BITS_PER_LONG, bits));
  
  

•   pr_info("out-of-bounds in __change_bit\n");
  

•   __change_bit(BITS_PER_LONG, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, __change_bit(BITS_PER_LONG, bits));
  
    /*
     * Below calls try to access bit beyond allocated memory.
     */
  

•   pr_info("out-of-bounds in test_and_set_bit\n");
  

•   test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in __test_and_set_bit\n");
  

•   __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           __test_and_set_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in test_and_set_bit_lock\n");
  

•   test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           test_and_set_bit_lock(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in test_and_clear_bit\n");
  

•   test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in __test_and_clear_bit\n");
  

•   __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           __test_and_clear_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in test_and_change_bit\n");
  

•   test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in __test_and_change_bit\n");
  

•   __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           __test_and_change_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

•   pr_info("out-of-bounds in test_bit\n");
  

•   (void)test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           (void)test_bit(BITS_PER_LONG + BITS_PER_BYTE, bits));
  
  

#if defined(clear_bit_unlock_is_negative_byte)

•   pr_info("out-of-bounds in clear_bit_unlock_is_negative_byte\n");
  

•   clear_bit_unlock_is_negative_byte(BITS_PER_LONG + BITS_PER_BYTE, bits);
  

•   KUNIT_EXPECT_KASAN_FAIL(test,
  

•           clear_bit_unlock_is_negative_byte(BITS_PER_LONG + BITS_PER_BYTE,
  

•                                           bits));
  

#endif kfree(bits); }

-static noinline void __init kmalloc_double_kzfree(void) +static void kmalloc_double_kzfree(struct kunit *test) { char *ptr; size_t size = 16;

•   pr_info("double-free (kzfree)\n");
    ptr = kmalloc(size, GFP_KERNEL);
  

•   if (!ptr) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
  
    kzfree(ptr);
  

•   kzfree(ptr);
  

•   KUNIT_EXPECT_KASAN_FAIL(test, kzfree(ptr));
  

}

-#ifdef CONFIG_KASAN_VMALLOC -static noinline void __init vmalloc_oob(void) +static void vmalloc_oob(struct kunit *test) { void *area;

•   pr_info("vmalloc out-of-bounds\n");
  

•   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);
  

•   if (!area) {
  

•           pr_err("Allocation failed\n");
  

•           return;
  

•   }
  

•   KUNIT_ASSERT_NOT_ERR_OR_NULL(test, area);
  
  

•   ((volatile char *)area)[3100];
  

•   KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)area)[3100]);
    vfree(area);
  

} -#else -static void __init vmalloc_oob(void) {} -#endif

-static int __init kmalloc_tests_init(void) -{

•   /*
  

•    * Temporarily enable multi-shot mode. Otherwise, we'd only get a
  

•    * report for the first case.
  

•    */
  

•   bool multishot = kasan_save_enable_multi_shot();
  

•   kmalloc_oob_right();
  

•   kmalloc_oob_left();
  

•   kmalloc_node_oob_right();
  

-#ifdef CONFIG_SLUB

•   kmalloc_pagealloc_oob_right();
  

•   kmalloc_pagealloc_uaf();
  

•   kmalloc_pagealloc_invalid_free();
  

-#endif

•   kmalloc_large_oob_right();
  

•   kmalloc_oob_krealloc_more();
  

•   kmalloc_oob_krealloc_less();
  

•   kmalloc_oob_16();
  

•   kmalloc_oob_in_memset();
  

•   kmalloc_oob_memset_2();
  

•   kmalloc_oob_memset_4();
  

•   kmalloc_oob_memset_8();
  

•   kmalloc_oob_memset_16();
  

•   kmalloc_uaf();
  

•   kmalloc_uaf_memset();
  

•   kmalloc_uaf2();
  

•   kfree_via_page();
  

•   kfree_via_phys();
  

•   kmem_cache_oob();
  

•   memcg_accounted_kmem_cache();
  

•   kasan_stack_oob();
  

•   kasan_global_oob();
  

•   kasan_alloca_oob_left();
  

•   kasan_alloca_oob_right();
  

•   ksize_unpoisons_memory();
  

•   copy_user_test();
  

•   kmem_cache_double_free();
  

•   kmem_cache_invalid_free();
  

•   kasan_memchr();
  

•   kasan_memcmp();
  

•   kasan_strings();
  

•   kasan_bitops();
  

•   kmalloc_double_kzfree();
  

•   vmalloc_oob();
  

•   kasan_restore_multi_shot(multishot);
  

•   return -EAGAIN;
  

-} +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_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_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),
  

•   KUNIT_CASE(kmalloc_double_kzfree),
  

•   KUNIT_CASE(vmalloc_oob),
  

•   {}
  

+};

+static struct kunit_suite kasan_kunit_test_suite = {

•   .name = "kasan_kunit_test",
  

•   .init = kasan_test_init,
  

•   .test_cases = kasan_kunit_test_cases,
  

•   .exit = kasan_test_exit,
  

+};

+kunit_test_suite(kasan_kunit_test_suite);

-module_init(kmalloc_tests_init); MODULE_LICENSE("GPL"); diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c new file mode 100644 index 000000000000..87d7e4d8fc31 --- /dev/null +++ b/lib/test_kasan_module.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0-only +/*

• • Copyright (c) 2014 Samsung Electronics Co., Ltd.
• • Author: Andrey Ryabinin a.ryabinin@samsung.com
• */

+#define pr_fmt(fmt) "kasan test: %s " fmt, __func__

+#include <linux/mman.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/slab.h> +#include <linux/uaccess.h>

+static noinline void __init copy_user_test(void) +{

•   char *kmem;
  

•   char __user *usermem;
  

•   size_t size = 10;
  

•   int unused;
  

•   kmem = kmalloc(size, GFP_KERNEL);
  

•   if (!kmem)
  

•           return;
  

•   usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
  

•                       PROT_READ | PROT_WRITE | PROT_EXEC,
  

•                       MAP_ANONYMOUS | MAP_PRIVATE, 0);
  

•   if (IS_ERR(usermem)) {
  

•           pr_err("Failed to allocate user memory\n");
  

•           kfree(kmem);
  

•           return;
  

•   }
  

•   pr_info("out-of-bounds in copy_from_user()\n");
  

•   unused = copy_from_user(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in copy_to_user()\n");
  

•   unused = copy_to_user(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in __copy_from_user()\n");
  

•   unused = __copy_from_user(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in __copy_to_user()\n");
  

•   unused = __copy_to_user(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
  

•   unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
  

•   pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
  

•   unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
  

•   pr_info("out-of-bounds in strncpy_from_user()\n");
  

•   unused = strncpy_from_user(kmem, usermem, size + 1);
  

•   vm_munmap((unsigned long)usermem, PAGE_SIZE);
  

•   kfree(kmem);
  

+}

+static int __init test_kasan_module_init(void) +{

•   /*
  

•    * Temporarily enable multi-shot mode. Otherwise, we'd only get a
  

•    * report for the first case.
  

•    */
  

•   bool multishot = kasan_save_enable_multi_shot();
  

•   copy_user_test();
  

•   kasan_restore_multi_shot(multishot);
  

•   return -EAGAIN;
  

+}

+module_init(test_kasan_module_init);

+MODULE_LICENSE("GPL");

2.26.0.rc2.310.g2932bb562d-goog