From patchwork Thu Sep 5 14:56:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksa Sarai X-Patchwork-Id: 13792508 Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172]) (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 7B73B7F7FC; Thu, 5 Sep 2024 14:57:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725548278; cv=none; b=BIaJGzUHPvNX/rWMLtmIxx0uUqVi8Ua9jDisBLfCof/HhPtMsLPLHZEeuoWgCraZldMTmWLNvUiMICSpgLefgh74ICAQ8Eo5ORmxUHZg49vrL4cMKMqyL/iXGctXoJnGYbBV7o9risllzUrmvol7ExOx40P7YkxkECBd7Fk4f8A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725548278; c=relaxed/simple; bh=Xo4dbP+N+dKe3SIozVX57QvOYTkX/g8hqX8+Psww87E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Y4pqfw8FBr18MRLFEaV5FT2+Bo8pS91CJ7Y4VLpLqQZqeODprGrgy75v9s86Z2AYnGMuD7xsldzkJ89Ib7AtU+4D50DG2x6bb0UufMGYb0q6wuD00/hTnDsCydQpKW8KP/yBCOgrzz6zTtEpwhSCfmYUE094SM0Ds+LfoC41l30= 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=R2cto8b3; arc=none smtp.client-ip=80.241.56.172 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="R2cto8b3" 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-202.mailbox.org (Postfix) with ESMTPS id 4X02Xc6nzkz9t6V; Thu, 5 Sep 2024 16:57:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cyphar.com; s=MBO0001; t=1725548273; 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=j6zDx/4wSgap3qpn522sEqjp0S1pufmopLG4YO9X8BM=; b=R2cto8b3gJsoczRAl9qHVBmzwA+YGlQNupg9uzRnF0t+IJpqzbN2k11zidq/Wa/TT2BLyT SQZR9M3zqz4w5TLYrkNbxw1v6qPprWmYunKu0WpmUMoc16tsazztDoyyyV0WGd+YZHgD9X plqdUOI4V25DLw7GJgz3tjAu0mV9lh5E6M3daGLp4T/p+v8W0WIC3uIoFT8y+EIFbaUEG2 g2DTCOK8V9zeH3zWHib1l4XoAuU7D33Zoff0peCtTPfI3xr+nKUibwlGR/PwV+BgZStoOK Wsol534A2RV5sIcZWaM+fW/1eD3JBhywmyeiBPbba9htIBTcswgxsgricxsUCA== From: Aleksa Sarai Date: Fri, 06 Sep 2024 00:56:37 +1000 Subject: [PATCH RFC v2 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: <20240906-extensible-structs-check_fields-v2-5-0f46d2de9bad@cyphar.com> References: <20240906-extensible-structs-check_fields-v2-0-0f46d2de9bad@cyphar.com> In-Reply-To: <20240906-extensible-structs-check_fields-v2-0-0f46d2de9bad@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=Xo4dbP+N+dKe3SIozVX57QvOYTkX/g8hqX8+Psww87E=; b=owGbwMvMwCWmMf3Xpe0vXfIZT6slMaTdPLb5URWz6trbTC5piQHcm77/FZz3/enFDtHpR2zTP GbK2Ss/6ihlYRDjYpAVU2TZ5ucZumn+4ivJn1aywcxhZQIZwsDFKQATWe/B8D/ieLpMZPYCe9nM Xx/MnyyzNAvQY7/68rZtsXRUlwHTIQFGhv1NJbfOVM48qVUQ8VLbikPJ859avujMEzd2RromfGO 0ZgcA 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)); }