kunit: kasan_test: disable fortify string checker on kmalloc_oob_memset

Similar to commit 09c6304e38e4 ("kasan: test: fix compatibility with
FORTIFY_SOURCE") the kernel is panicing in kmalloc_oob_memset_*.

This is due to the `ptr` not being hidden from the optimizer which would
disable the runtime fortify string checker.

kernel BUG at lib/string_helpers.c:1048!
Call Trace:
[<00000000272502e2>] fortify_panic+0x2a/0x30
([<00000000272502de>] fortify_panic+0x26/0x30)
[<001bffff817045c4>] kmalloc_oob_memset_2+0x22c/0x230 [kasan_test]

Hide the `ptr` variable from the optimizer to fix the kernel panic.  Also
define a memset_size variable and hide that as well.  This cleans up the
code and follows the same convention as other tests.

[npache@redhat.com: address review comments from Andrey]
Link: https://lkml.kernel.org/r/20231214164423.6202-1-npache@redhat.com
Link: https://lkml.kernel.org/r/20231212232659.18839-1-npache@redhat.com
Signed-off-by: Nico Pache <npache@redhat.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c
index 8281eb42464be15af4188c115f3878f4ebeea374..34515a106ca5748e2d70664fce07a5800384d232 100644 (file)
--- a/mm/kasan/kasan_test.c
+++ b/mm/kasan/kasan_test.c
@@ -493,14 +493,17 @@ static void kmalloc_oob_memset_2(struct kunit *test)
 {
        char *ptr;
        size_t size = 128 - KASAN_GRANULE_SIZE;
+       size_t memset_size = 2;
 
        KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
 
        ptr = kmalloc(size, GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
+       OPTIMIZER_HIDE_VAR(ptr);
        OPTIMIZER_HIDE_VAR(size);
-       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 1, 0, 2));
+       OPTIMIZER_HIDE_VAR(memset_size);
+       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 1, 0, memset_size));
        kfree(ptr);
 }
 
@@ -508,14 +511,17 @@ static void kmalloc_oob_memset_4(struct kunit *test)
 {
        char *ptr;
        size_t size = 128 - KASAN_GRANULE_SIZE;
+       size_t memset_size = 4;
 
        KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
 
        ptr = kmalloc(size, GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
+       OPTIMIZER_HIDE_VAR(ptr);
        OPTIMIZER_HIDE_VAR(size);
-       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 3, 0, 4));
+       OPTIMIZER_HIDE_VAR(memset_size);
+       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 3, 0, memset_size));
        kfree(ptr);
 }
 
@@ -523,14 +529,17 @@ static void kmalloc_oob_memset_8(struct kunit *test)
 {
        char *ptr;
        size_t size = 128 - KASAN_GRANULE_SIZE;
+       size_t memset_size = 8;
 
        KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
 
        ptr = kmalloc(size, GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
+       OPTIMIZER_HIDE_VAR(ptr);
        OPTIMIZER_HIDE_VAR(size);
-       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 7, 0, 8));
+       OPTIMIZER_HIDE_VAR(memset_size);
+       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 7, 0, memset_size));
        kfree(ptr);
 }
 
@@ -538,14 +547,17 @@ static void kmalloc_oob_memset_16(struct kunit *test)
 {
        char *ptr;
        size_t size = 128 - KASAN_GRANULE_SIZE;
+       size_t memset_size = 16;
 
        KASAN_TEST_NEEDS_CHECKED_MEMINTRINSICS(test);
 
        ptr = kmalloc(size, GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
 
+       OPTIMIZER_HIDE_VAR(ptr);
        OPTIMIZER_HIDE_VAR(size);
-       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 15, 0, 16));
+       OPTIMIZER_HIDE_VAR(memset_size);
+       KUNIT_EXPECT_KASAN_FAIL(test, memset(ptr + size - 15, 0, memset_size));
        kfree(ptr);
 }