This is a followup to commit f649dc0e0d7b ("kasan: fix unit tests with CONFIG_UBSAN_LOCAL_BOUNDS enabled") that fixes tests that fail as a result of __alloc_size annotations being added to the kernel allocator functions.
Link: https://linux-review.googlesource.com/id/I4334cafc5db600fda5cebb851b2ee9fd09... Signed-off-by: Peter Collingbourne pcc@google.com Cc: stable@vger.kernel.org # 5.16.x Fixes: c37495d6254c ("slab: add __alloc_size attributes for better bounds checking") --- v2: - use OPTIMIZER_HIDE_VAR instead of volatile
lib/test_kasan.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c index 26a5c9007653..7c3dfb569445 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -185,6 +185,7 @@ static void kmalloc_pagealloc_oob_right(struct kunit *test) ptr = kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] = 0);
kfree(ptr); @@ -295,6 +296,7 @@ static void krealloc_more_oob_helper(struct kunit *test, KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');
/* For all modes first aligned offset after size2 must be inaccessible. */ + OPTIMIZER_HIDE_VAR(ptr2); KUNIT_EXPECT_KASAN_FAIL(test, ptr2[round_up(size2, KASAN_GRANULE_SIZE)] = 'x');
@@ -319,6 +321,8 @@ static void krealloc_less_oob_helper(struct kunit *test, /* Must be accessible for all modes. */ ptr2[size2 - 1] = 'x';
+ OPTIMIZER_HIDE_VAR(ptr2); + /* Generic mode is precise, so unaligned size2 must be inaccessible. */ if (IS_ENABLED(CONFIG_KASAN_GENERIC)) KUNIT_EXPECT_KASAN_FAIL(test, ptr2[size2] = 'x');