diff mbox series

[v2,13/14] kasan: add a test for kmem_cache_alloc/free_bulk

Message ID 0e994d67a05cbf23b3c6186a862b5d22cad2ca7b.1610554432.git.andreyknvl@google.com (mailing list archive)
State New, archived
Headers show
Series kasan: HW_TAGS tests support and fixes | expand

Commit Message

Andrey Konovalov Jan. 13, 2021, 4:21 p.m. UTC 
Add a test for kmem_cache_alloc/free_bulk to make sure there are now
false-positives when these functions are used.

Link: https://linux-review.googlesource.com/id/I2a8bf797aecf81baeac61380c567308f319e263d
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 lib/test_kasan.c | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

Comments

Marco Elver Jan. 13, 2021, 4:37 p.m. UTC | #1 
On Wed, 13 Jan 2021 at 17:22, Andrey Konovalov <andreyknvl@google.com> wrote:
>
> Add a test for kmem_cache_alloc/free_bulk to make sure there are now
> false-positives when these functions are used.

s/now/no/ (but by itself doesn't necessarily demand a v3)

> Link: https://linux-review.googlesource.com/id/I2a8bf797aecf81baeac61380c567308f319e263d
> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> ---
>  lib/test_kasan.c | 39 ++++++++++++++++++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 5 deletions(-)
>
> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index 5e3d054e5b8c..d9f9a93922d5 100644
> --- a/lib/test_kasan.c
> +++ b/lib/test_kasan.c
> @@ -479,10 +479,11 @@ 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);
> +       struct kmem_cache *cache;
> +
> +       cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
>         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
> +
>         p = kmem_cache_alloc(cache, GFP_KERNEL);
>         if (!p) {
>                 kunit_err(test, "Allocation failed: %s\n", __func__);
> @@ -491,11 +492,12 @@ static void kmem_cache_oob(struct kunit *test)
>         }
>
>         KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
> +
>         kmem_cache_free(cache, p);
>         kmem_cache_destroy(cache);
>  }
>
> -static void memcg_accounted_kmem_cache(struct kunit *test)
> +static void kmem_cache_accounted(struct kunit *test)
>  {
>         int i;
>         char *p;
> @@ -522,6 +524,32 @@ static void memcg_accounted_kmem_cache(struct kunit *test)
>         kmem_cache_destroy(cache);
>  }
>
> +static void kmem_cache_bulk(struct kunit *test)
> +{
> +       struct kmem_cache *cache;
> +       size_t size = 200;
> +       size_t p_size = 10;

s/p_size/ARRAY_SIZE(p)/
?

> +       char *p[10];
> +       bool ret;
> +       int i;
> +
> +       cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
> +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
> +
> +       ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, p_size, (void **)&p);
> +       if (!ret) {
> +               kunit_err(test, "Allocation failed: %s\n", __func__);
> +               kmem_cache_destroy(cache);
> +               return;
> +       }
> +
> +       for (i = 0; i < p_size; i++)
> +               p[i][0] = p[i][size - 1] = 42;
> +
> +       kmem_cache_free_bulk(cache, p_size, (void **)&p);
> +       kmem_cache_destroy(cache);
> +}
> +
>  static char global_array[10];
>
>  static void kasan_global_oob(struct kunit *test)
> @@ -961,7 +989,8 @@ static struct kunit_case kasan_kunit_test_cases[] = {
>         KUNIT_CASE(kfree_via_page),
>         KUNIT_CASE(kfree_via_phys),
>         KUNIT_CASE(kmem_cache_oob),
> -       KUNIT_CASE(memcg_accounted_kmem_cache),
> +       KUNIT_CASE(kmem_cache_accounted),
> +       KUNIT_CASE(kmem_cache_bulk),
>         KUNIT_CASE(kasan_global_oob),
>         KUNIT_CASE(kasan_stack_oob),
>         KUNIT_CASE(kasan_alloca_oob_left),
> --
> 2.30.0.284.gd98b1dd5eaa7-goog
>
Andrey Konovalov Jan. 14, 2021, 3:32 p.m. UTC | #2 
On Wed, Jan 13, 2021 at 5:38 PM Marco Elver <elver@google.com> wrote:
>
> On Wed, 13 Jan 2021 at 17:22, Andrey Konovalov <andreyknvl@google.com> wrote:
> >
> > Add a test for kmem_cache_alloc/free_bulk to make sure there are now
> > false-positives when these functions are used.
>
> s/now/no/ (but by itself doesn't necessarily demand a v3)
>
> > Link: https://linux-review.googlesource.com/id/I2a8bf797aecf81baeac61380c567308f319e263d
> > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > ---
> >  lib/test_kasan.c | 39 ++++++++++++++++++++++++++++++++++-----
> >  1 file changed, 34 insertions(+), 5 deletions(-)
> >
> > diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> > index 5e3d054e5b8c..d9f9a93922d5 100644
> > --- a/lib/test_kasan.c
> > +++ b/lib/test_kasan.c
> > @@ -479,10 +479,11 @@ 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);
> > +       struct kmem_cache *cache;
> > +
> > +       cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
> >         KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
> > +
> >         p = kmem_cache_alloc(cache, GFP_KERNEL);
> >         if (!p) {
> >                 kunit_err(test, "Allocation failed: %s\n", __func__);
> > @@ -491,11 +492,12 @@ static void kmem_cache_oob(struct kunit *test)
> >         }
> >
> >         KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
> > +
> >         kmem_cache_free(cache, p);
> >         kmem_cache_destroy(cache);
> >  }
> >
> > -static void memcg_accounted_kmem_cache(struct kunit *test)
> > +static void kmem_cache_accounted(struct kunit *test)
> >  {
> >         int i;
> >         char *p;
> > @@ -522,6 +524,32 @@ static void memcg_accounted_kmem_cache(struct kunit *test)
> >         kmem_cache_destroy(cache);
> >  }
> >
> > +static void kmem_cache_bulk(struct kunit *test)
> > +{
> > +       struct kmem_cache *cache;
> > +       size_t size = 200;
> > +       size_t p_size = 10;
>
> s/p_size/ARRAY_SIZE(p)/
> ?
>
> > +       char *p[10];
> > +       bool ret;
> > +       int i;
> > +
> > +       cache = kmem_cache_create("test_cache", size, 0, 0, NULL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
> > +
> > +       ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, p_size, (void **)&p);
> > +       if (!ret) {
> > +               kunit_err(test, "Allocation failed: %s\n", __func__);
> > +               kmem_cache_destroy(cache);
> > +               return;
> > +       }
> > +
> > +       for (i = 0; i < p_size; i++)
> > +               p[i][0] = p[i][size - 1] = 42;
> > +
> > +       kmem_cache_free_bulk(cache, p_size, (void **)&p);
> > +       kmem_cache_destroy(cache);
> > +}
> > +
> >  static char global_array[10];
> >
> >  static void kasan_global_oob(struct kunit *test)
> > @@ -961,7 +989,8 @@ static struct kunit_case kasan_kunit_test_cases[] = {
> >         KUNIT_CASE(kfree_via_page),
> >         KUNIT_CASE(kfree_via_phys),
> >         KUNIT_CASE(kmem_cache_oob),
> > -       KUNIT_CASE(memcg_accounted_kmem_cache),
> > +       KUNIT_CASE(kmem_cache_accounted),
> > +       KUNIT_CASE(kmem_cache_bulk),
> >         KUNIT_CASE(kasan_global_oob),
> >         KUNIT_CASE(kasan_stack_oob),
> >         KUNIT_CASE(kasan_alloca_oob_left),
> > --
> > 2.30.0.284.gd98b1dd5eaa7-goog
> >

Will fix all in v3, thanks!
diff mbox series

Patch

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 5e3d054e5b8c..d9f9a93922d5 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -479,10 +479,11 @@  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);
+	struct kmem_cache *cache;
+
+	cache = kmem_cache_create("test_cache",	size, 0, 0, NULL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
 	p = kmem_cache_alloc(cache, GFP_KERNEL);
 	if (!p) {
 		kunit_err(test, "Allocation failed: %s\n", __func__);
@@ -491,11 +492,12 @@  static void kmem_cache_oob(struct kunit *test)
 	}
 
 	KUNIT_EXPECT_KASAN_FAIL(test, *p = p[size + OOB_TAG_OFF]);
+
 	kmem_cache_free(cache, p);
 	kmem_cache_destroy(cache);
 }
 
-static void memcg_accounted_kmem_cache(struct kunit *test)
+static void kmem_cache_accounted(struct kunit *test)
 {
 	int i;
 	char *p;
@@ -522,6 +524,32 @@  static void memcg_accounted_kmem_cache(struct kunit *test)
 	kmem_cache_destroy(cache);
 }
 
+static void kmem_cache_bulk(struct kunit *test)
+{
+	struct kmem_cache *cache;
+	size_t size = 200;
+	size_t p_size = 10;
+	char *p[10];
+	bool ret;
+	int i;
+
+	cache = kmem_cache_create("test_cache",	size, 0, 0, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
+
+	ret = kmem_cache_alloc_bulk(cache, GFP_KERNEL, p_size, (void **)&p);
+	if (!ret) {
+		kunit_err(test, "Allocation failed: %s\n", __func__);
+		kmem_cache_destroy(cache);
+		return;
+	}
+
+	for (i = 0; i < p_size; i++)
+		p[i][0] = p[i][size - 1] = 42;
+
+	kmem_cache_free_bulk(cache, p_size, (void **)&p);
+	kmem_cache_destroy(cache);
+}
+
 static char global_array[10];
 
 static void kasan_global_oob(struct kunit *test)
@@ -961,7 +989,8 @@  static struct kunit_case kasan_kunit_test_cases[] = {
 	KUNIT_CASE(kfree_via_page),
 	KUNIT_CASE(kfree_via_phys),
 	KUNIT_CASE(kmem_cache_oob),
-	KUNIT_CASE(memcg_accounted_kmem_cache),
+	KUNIT_CASE(kmem_cache_accounted),
+	KUNIT_CASE(kmem_cache_bulk),
 	KUNIT_CASE(kasan_global_oob),
 	KUNIT_CASE(kasan_stack_oob),
 	KUNIT_CASE(kasan_alloca_oob_left),