From nobody Sat Feb 7 16:59:30 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99086C25B08 for ; Mon, 15 Aug 2022 22:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350798AbiHOWkn (ORCPT ); Mon, 15 Aug 2022 18:40:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350407AbiHOWgd (ORCPT ); Mon, 15 Aug 2022 18:36:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C3A212F715; Mon, 15 Aug 2022 12:50:13 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3173861089; Mon, 15 Aug 2022 19:49:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2CCE2C433C1; Mon, 15 Aug 2022 19:49:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660592984; bh=rL2JjXrFDpp4+lMDb3vqOvN1N3q+hens8UpckDx4+5s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dbiLDWCWvCSiLB1tYrEG1mohupS7QCz1H+APT4cyiHPPneWhmflKkUNln+hp7FOgy rQNTbLP4OowMS385R0kr0nl8FfSg54IaigiyYqCNLE4g2fQkY4Nm4RFt1wKUG/sziv DYsH8iMn+5hXdL0KUwdzedJ/H04lQ3hd+hHd9o4I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, Kees Cook , Sasha Levin Subject: [PATCH 5.19 0196/1157] kasan: test: Silence GCC 12 warnings Date: Mon, 15 Aug 2022 19:52:32 +0200 Message-Id: <20220815180447.555804762@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Kees Cook [ Upstream commit aaf50b1969d7933a51ea421b11432a7fb90974e3 ] GCC 12 continues to get smarter about array accesses. The KASAN tests are expecting to explicitly test out-of-bounds conditions at run-time, so hide the variable from GCC, to avoid warnings like: ../lib/test_kasan.c: In function 'ksize_uaf': ../lib/test_kasan.c:790:61: warning: array subscript 120 is outside array b= ounds of 'void[120]' [-Warray-bounds] 790 | KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]); | ~~~~~~~~~~~~~~~~~~~~~~^~~~~~ ../lib/test_kasan.c:97:9: note: in definition of macro 'KUNIT_EXPECT_KASAN_= FAIL' 97 | expression; \ | ^~~~~~~~~~ Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Dmitry Vyukov Cc: Vincenzo Frascino Cc: kasan-dev@googlegroups.com Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20220608214024.1068451-1-keescook@chromium.= org Signed-off-by: Sasha Levin --- lib/test_kasan.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index c233b1a4e984..58c1b01ccfe2 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -131,6 +131,7 @@ static void kmalloc_oob_right(struct kunit *test) ptr =3D kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); /* * An unaligned access past the requested kmalloc size. * Only generic KASAN can precisely detect these. @@ -159,6 +160,7 @@ static void kmalloc_oob_left(struct kunit *test) ptr =3D kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, *ptr =3D *(ptr - 1)); kfree(ptr); } @@ -171,6 +173,7 @@ static void kmalloc_node_oob_right(struct kunit *test) ptr =3D kmalloc_node(size, GFP_KERNEL, 0); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, ptr[0] =3D ptr[size]); kfree(ptr); } @@ -191,6 +194,7 @@ static void kmalloc_pagealloc_oob_right(struct kunit *t= est) ptr =3D kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, ptr[size + OOB_TAG_OFF] =3D 0); =20 kfree(ptr); @@ -271,6 +275,7 @@ static void kmalloc_large_oob_right(struct kunit *test) ptr =3D kmalloc(size, GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, ptr[size] =3D 0); kfree(ptr); } @@ -410,6 +415,8 @@ static void kmalloc_oob_16(struct kunit *test) ptr2 =3D kmalloc(sizeof(*ptr2), GFP_KERNEL); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr2); =20 + OPTIMIZER_HIDE_VAR(ptr1); + OPTIMIZER_HIDE_VAR(ptr2); KUNIT_EXPECT_KASAN_FAIL(test, *ptr1 =3D *ptr2); kfree(ptr1); kfree(ptr2); @@ -756,6 +763,8 @@ static void ksize_unpoisons_memory(struct kunit *test) KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); real_size =3D ksize(ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); + /* This access shouldn't trigger a KASAN report. */ ptr[size] =3D 'x'; =20 @@ -778,6 +787,7 @@ static void ksize_uaf(struct kunit *test) KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr); kfree(ptr); =20 + OPTIMIZER_HIDE_VAR(ptr); KUNIT_EXPECT_KASAN_FAIL(test, ksize(ptr)); KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[0]); KUNIT_EXPECT_KASAN_FAIL(test, ((volatile char *)ptr)[size]); --=20 2.35.1