From patchwork Wed Oct 9 20:40:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksa Sarai X-Patchwork-Id: 834357 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 677721E230F; Wed, 9 Oct 2024 20:41:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728506515; cv=none; b=A+EtDe1T5Ad+nMTMs/ENRwhuoxLPEWh5lMpdLxs4WOfqej8qLJNDsr508D2F9qltSz2lQNCbiSZIyikh3mAJexUx0uGieMCdD73Od6Cus9DkVYQykJR5RvfKsRfvnOfruMcwEXG0W8uwUHlOvpOqnJl4B9u5bW1hyavp8nmJyIw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728506515; c=relaxed/simple; bh=M9iWszswoUm+ACdoBR6OSZmDmOZ0gV76Hvojwn9eqxg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QLmhlSQRTK9cDHAWlf4VaORU1xTDXEVxAXJjnQ+QIzQcnOGEEuT9YmwGp5PvlfEInbRVK/zb+qidx/WBOXPIK2HxSXNAMZAp4qKp1YntG6oNJt3st3ZANoH3UHvb25btrjd2zgDyFPy+MdsKXJUV/YW0ukJU0KtqWDTW2IFCnPk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cyphar.com; spf=pass smtp.mailfrom=cyphar.com; dkim=pass (2048-bit key) header.d=cyphar.com header.i=@cyphar.com header.b=dK5pokPQ; arc=none smtp.client-ip=80.241.56.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cyphar.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cyphar.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cyphar.com header.i=@cyphar.com header.b="dK5pokPQ" Received: from smtp102.mailbox.org (smtp102.mailbox.org [10.196.197.102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4XP4Yn5rqSz9stM; Wed, 9 Oct 2024 22:41:49 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cyphar.com; s=MBO0001; t=1728506509; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ICm4bzvlgrwdJ59X+goTMMQMK+SqT/1B0scZvKOBQTs=; b=dK5pokPQPwhS6hvQWb4G/R+lf0fAFk8NSut94azvuDIVK6tn1w/g7zwucLdIO1XSkbU+2q HrPW6B6fgMKPPJ2KNgbBIRou7R2RdaXSFqxgB/8Zcy7pO1hokarxIo/c1W4x+U1Fw/IRX/ VN2BLam3lFDCKX/ULiriBfubnuXNHPtsaKazWAg3/Z+UrZI//jfR73fuiuuVYxyiVEXOXb wBfjvmt3cb6Haf9/vxwu2jjbBiwg7XEsLuPE3PHlUs8Ohr6HsJeNV+uakMHDdM6grawp+u skDl+KqlBCZKVExZCQ7zT6uMgzZCAB6ugP8boNif9iiF/wU3cw2rZBdGoOAUHg== From: Aleksa Sarai Date: Thu, 10 Oct 2024 07:40:38 +1100 Subject: [PATCH RFC v3 05/10] selftests: openat2: add 0xFF poisoned data after misaligned struct Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241010-extensible-structs-check_fields-v3-5-d2833dfe6edd@cyphar.com> References: <20241010-extensible-structs-check_fields-v3-0-d2833dfe6edd@cyphar.com> In-Reply-To: <20241010-extensible-structs-check_fields-v3-0-d2833dfe6edd@cyphar.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Alexander Viro , Christian Brauner , Jan Kara , Arnd Bergmann , Shuah Khan Cc: Kees Cook , Florian Weimer , Arnd Bergmann , Mark Rutland , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, Aleksa Sarai X-Developer-Signature: v=1; a=openpgp-sha256; l=1132; i=cyphar@cyphar.com; h=from:subject:message-id; bh=M9iWszswoUm+ACdoBR6OSZmDmOZ0gV76Hvojwn9eqxg=; b=owGbwMvMwCWmMf3Xpe0vXfIZT6slMaSzvQoMsvl4dsUWLUPVxvLwfKcdlqtcfZK+/MlYn/Gk8 HTzybffOkpZGMS4GGTFFFm2+XmGbpq/+Eryp5VsMHNYmUCGMHBxCsBE5GwYGS5HVKhYHmNycL9i yNAf/9q6yXp79C6XGw3rtvwL0sg7so6R4cK8zrjrolp9+r8Wtat3JaY4nPHqWrj1f3B08pWb/27 7MAMA X-Developer-Key: i=cyphar@cyphar.com; a=openpgp; fpr=C9C370B246B09F6DBCFC744C34401015D1D2D386 We should also verify that poisoned data after a misaligned struct is also handled correctly by is_zeroed_user(). This test passes with no kernel changes needed, so is_zeroed_user() was correct already. Fixes: b28a10aedcd4 ("selftests: add openat2(2) selftests") Signed-off-by: Aleksa Sarai --- tools/testing/selftests/openat2/openat2_test.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/openat2/openat2_test.c b/tools/testing/selftests/openat2/openat2_test.c index 5790ab446527..4ca175a16ad6 100644 --- a/tools/testing/selftests/openat2/openat2_test.c +++ b/tools/testing/selftests/openat2/openat2_test.c @@ -112,9 +112,9 @@ void test_openat2_struct(void) * * This is effectively to check that is_zeroed_user() works. */ - copy = malloc(misalign + sizeof(how_ext)); + copy = malloc(misalign*2 + sizeof(how_ext)); how_copy = copy + misalign; - memset(copy, 0xff, misalign); + memset(copy, 0xff, misalign*2 + sizeof(how_ext)); memcpy(how_copy, &how_ext, sizeof(how_ext)); }