| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CABVgOSmJprSKJ69AtyCqi46Oae_zK5ruDdAt3xvo1Gzhz_P=0Q@mail.gmail.com>
Date: Thu, 16 Apr 2020 14:38:47 +0800
From: David Gow <davidgow@...gle.com>
To: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Patricia Alfonso <trishalfonso@...gle.com>,
Brendan Higgins <brendanhiggins@...gle.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
LKML <linux-kernel@...r.kernel.org>,
kasan-dev <kasan-dev@...glegroups.com>,
KUnit Development <kunit-dev@...glegroups.com>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v5 3/4] KASAN: Port KASAN Tests to KUnit
On Tue, Apr 14, 2020 at 10:29 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
>
> On Tue, Apr 14, 2020 at 5:17 AM 'David Gow' via kasan-dev
> <kasan-dev@...glegroups.com> wrote:
> >
> > From: Patricia Alfonso <trishalfonso@...gle.com>
> >
> > 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@...gle.com>
> > Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
> > Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
> > Signed-off-by: David Gow <davidgow@...gle.com>
> > ---
> > lib/Kconfig.kasan | 18 +-
> > lib/Makefile | 3 +-
> > lib/test_kasan.c | 622 ++++++++++++++++------------------------
> > lib/test_kasan_module.c | 76 +++++
> > 4 files changed, 337 insertions(+), 382 deletions(-)
> > create mode 100644 lib/test_kasan_module.c
> >
> > diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> > index 81f5464ea9e1..53063dee3f81 100644
> > --- a/lib/Kconfig.kasan
> > +++ b/lib/Kconfig.kasan
> > @@ -158,10 +158,18 @@ 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-compatible tests of KASAN bug detection capabilities"
> > + depends on KASAN && KUNIT
> > help
> > - This is a test module doing various nasty things like
> > - out of bounds accesses, use after free. It is useful for testing
> > + This is a KUnit test suite doing various nasty things like
> > + out of bounds and use after free accesses. It is useful for testing
> > kernel debugging features like KASAN.
> > +
> > +config TEST_KASAN_MODULE
> > + tristate "KUnit-incompatible tests of KASAN bug detection capabilities"
> > + depends on m && KASAN
> > + help
> > + This is a part of the KASAN test suite that is incompatible with
> > + KUnit. Currently includes tests that do bad copy_from/to_user
> > + accesses.
> > 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 7b4cb107b387..801ef7573da2 100644
> > --- a/lib/test_kasan.c
> > +++ b/lib/test_kasan.c
> > @@ -5,8 +5,6 @@
> > * Author: Andrey Ryabinin <a.ryabinin@...sung.com>
> > */
> >
> > -#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
> > -
> > #include <linux/bitops.h>
> > #include <linux/delay.h>
> > #include <linux/kasan.h>
> > @@ -65,380 +63,311 @@ static void kasan_test_exit(struct kunit *test)
> > fail_data.report_found); \
> > } while (0)
> >
> > +static void kmalloc_oob_right(struct kunit *test)
> > {
> > char *ptr;
> > size_t size = 123;
> >
> > - pr_info("out-of-bounds to right\n");
> > ptr = kmalloc(size, GFP_KERNEL);
> > - if (!ptr) {
> > - pr_err("Allocation failed\n");
> > - return;
> > - }
> > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
> >
> > - ptr[size] = 'x';
> > + KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] = '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.");
> > + 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__);
>
> Any reason why this is a kunit_err() instead of
> KUNIT_ASSERT_NOT_ERR_OR_NULL()? It seems inconsistent to use
> KUNIT_ASSERT_NOT_ERR_OR_NULL() for kmalloc() and kmem_cache_create(),
> but not for kmem_cache_alloc(). Unless there's a reason for it.
>
This was because we need to clean up the kmem_cache before the test
ends. KUNIT_ASSERT_NOT_ERR_OR_NULL() would kill the test immediately,
before the kmem_cache_destroy() line could execute.
There are other things we could do to make this a bit more consistent
though: we could use IS_ERR_OR_NULL() rather than just checking !, or
we could set up the kmem_cache as a kunit resource, which would
automatically be cleaned up. For a simple test like this, though, it
may be overkill.
> > 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;
> > @@ -446,12 +375,8 @@ 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.
> > @@ -471,134 +396,93 @@ 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;
> > + KUNIT_EXPECT_KASAN_FAIL(test, *(volatile char *)p);
> > }
> >
> > -static noinline void __init kasan_stack_oob(void)
> > -{
> > - char stack_array[10];
> > - volatile int i = 0;
> > - char *p = &stack_array[ARRAY_SIZE(stack_array) + i];
> > -
> > - pr_info("out-of-bounds on stack\n");
> > - *(volatile char *)p;
> > -}
> > -
> > -static noinline void __init ksize_unpoisons_memory(void)
> > +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__);
>
> Same here.
>
> > 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;
> > @@ -606,20 +490,17 @@ 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__);
>
> And here.
>
As above, this is due to needing to clean up the kmem_cache.
> > 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
> > @@ -630,45 +511,60 @@ 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
>
> Wrong comment style here and below. Please use scripts/checkpatch.pl
> to check your patches.
>
Huh. Checkpatch didn't pick up on this. I've fixed it (here and below)
for the next revision.
> > + if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
> > + kunit_info(test,
> > + "str* functions are not instrumented with CONFIG_AMD_MEM_ENCRYPT");
> > return;
> > + }
> >
> > - memchr(ptr, '1', size + 1);
> > + ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
> > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
> > +
> > + 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);
> >
> > @@ -679,188 +575,162 @@ 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@...sung.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");
> > --
> > 2.26.0.110.g2183baf09c-goog
> >
> > --
> > You received this message because you are subscribed to the Google Groups "kasan-dev" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@...glegroups.com.
> > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20200414031647.124664-4-davidgow%40google.com.
Thanks for looking over this (and the other patches). I've made the
suggested changes, and will send out a v6 with in the next day or so.
Cheers,
-- David
Powered by blists - more mailing lists