From: Kees Cook <keesc...@chromium.org>
kasan: test: Silence intentional read overflow warnings
As done in commit d73dad4eb5ad ("kasan: test: bypass __alloc_size checks")
for __write_overflow warnings, also silence some more cases that trip
the __read_overflow warnings seen in 5.16-rc1[1]:
In file included from /kisskb/src/include/linux/string.h:253,
from /kisskb/src/include/linux/bitmap.h:10,
from /kisskb/src/include/linux/cpumask.h:12,
from /kisskb/src/include/linux/mm_types_task.h:14,
from /kisskb/src/include/linux/mm_types.h:5,
from /kisskb/src/include/linux/page-flags.h:13,
from /kisskb/src/arch/arm64/include/asm/mte.h:14,
from /kisskb/src/arch/arm64/include/asm/pgtable.h:12,
from /kisskb/src/include/linux/pgtable.h:6,
from /kisskb/src/include/linux/kasan.h:29,
from /kisskb/src/lib/test_kasan.c:10:
In function 'memcmp',
inlined from 'kasan_memcmp' at /kisskb/src/lib/test_kasan.c:897:2:
/kisskb/src/include/linux/fortify-string.h:263:25: error: call to
'__read_overflow' declared with attribute error: detected read beyond size of
object (1st parameter)
263 | __read_overflow();
| ^~~~~~~~~~~~~~~~~
In function 'memchr',
inlined from 'kasan_memchr' at /kisskb/src/lib/test_kasan.c:872:2:
/kisskb/src/include/linux/fortify-string.h:277:17: error: call to
'__read_overflow' declared with attribute error: detected read beyond size of
object (1st parameter)
277 | __read_overflow();
| ^~~~~~~~~~~~~~~~~
[1] http://kisskb.ellerman.id.au/kisskb/buildresult/14660585/log/
Cc: Marco Elver <el...@google.com>
Cc: Andrey Ryabinin <ryabinin....@gmail.com>
Cc: Alexander Potapenko <gli...@google.com>
Cc: Andrey Konovalov <andreyk...@gmail.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: kasan-...@googlegroups.com
Fixes: d73dad4eb5ad ("kasan: test: bypass __alloc_size checks")
Signed-off-by: Kees Cook <keesc...@chromium.org>
Reviewed-by: Andrey Konovalov <andreyk...@gmail.com>
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index blahblah..blahblah 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -869,6 +869,7 @@ static void kasan_memchr(struct kunit *test)
ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
+ OPTIMIZER_HIDE_VAR(size);
KUNIT_EXPECT_KASAN_FAIL(test,
kasan_ptr_result = memchr(ptr, '1', size + 1));
@@ -894,6 +895,7 @@ static void kasan_memcmp(struct kunit *test)
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
memset(arr, 0, sizeof(arr));
+ OPTIMIZER_HIDE_VAR(size);
KUNIT_EXPECT_KASAN_FAIL(test,
kasan_int_result = memcmp(ptr, arr, size+1));
kfree(ptr);
--
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1501
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