From mboxrd@z Thu Jan 1 00:00:00 1970 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 us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E93F1C433F5 for ; Fri, 1 Apr 2022 14:48:55 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-357-hIrINEOJMOay9hkd_PFKXQ-1; Fri, 01 Apr 2022 10:48:53 -0400 X-MC-Unique: hIrINEOJMOay9hkd_PFKXQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C0ED02805522; Fri, 1 Apr 2022 14:48:51 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com [10.30.29.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id AE06E63B22D; Fri, 1 Apr 2022 14:48:51 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (localhost [IPv6:::1]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 5EB5D1947BBF; Fri, 1 Apr 2022 14:48:51 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 9FEE91947BBE for ; Fri, 1 Apr 2022 14:48:50 +0000 (UTC) Received: by smtp.corp.redhat.com (Postfix) id 93622141512B; Fri, 1 Apr 2022 14:48:50 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast03.extmail.prod.ext.rdu2.redhat.com [10.11.55.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8F973141512A for ; Fri, 1 Apr 2022 14:48:50 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 75D68811E7A for ; Fri, 1 Apr 2022 14:48:50 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-513-kB7YzwCwOJaCd3oUR04k6g-1; Fri, 01 Apr 2022 10:48:47 -0400 X-MC-Unique: kB7YzwCwOJaCd3oUR04k6g-1 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 205BA60A3C; Fri, 1 Apr 2022 14:48:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68BC9C340F2; Fri, 1 Apr 2022 14:48:44 +0000 (UTC) From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Fri, 1 Apr 2022 10:48:18 -0400 Message-Id: <20220401144827.1955845-7-sashal@kernel.org> In-Reply-To: <20220401144827.1955845-1-sashal@kernel.org> References: <20220401144827.1955845-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Subject: [dm-devel] [PATCH AUTOSEL 4.9 07/16] dm ioctl: prevent potential spectre v1 gadget X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Jordy Zomer , Mike Snitzer , snitzer@kernel.org, dm-devel@redhat.com, Jordy Zomer , agk@redhat.com Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="===============7550328880969800842==" --===============7550328880969800842== Content-Transfer-Encoding: quoted-printable Content-Type: application/octet-stream; x-default=true From: Jordy Zomer [ Upstream commit cd9c88da171a62c4b0f1c70e50c75845969fbc18 ] It appears like cmd could be a Spectre v1 gadget as it's supplied by a user and used as an array index. Prevent the contents of kernel memory from being leaked to userspace via speculative execution by using array_index_nospec. Signed-off-by: Jordy Zomer Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-ioctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index eb2659a12310..70245782e7f6 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -16,6 +16,7 @@ #include #include #include +#include =20 #include =20 @@ -1642,6 +1643,7 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *i= octl_flags) =09if (unlikely(cmd >=3D ARRAY_SIZE(_ioctls))) =09=09return NULL; =20 +=09cmd =3D array_index_nospec(cmd, ARRAY_SIZE(_ioctls)); =09*ioctl_flags =3D _ioctls[cmd].flags; =09return _ioctls[cmd].fn; } --=20 2.34.1 --===============7550328880969800842== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel --===============7550328880969800842==-- From mboxrd@z Thu Jan 1 00:00:00 1970 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 A1E87C352AA for ; Fri, 1 Apr 2022 15:40:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357602AbiDAPir (ORCPT ); Fri, 1 Apr 2022 11:38:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350676AbiDAPAZ (ORCPT ); Fri, 1 Apr 2022 11:00:25 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 383D239140; Fri, 1 Apr 2022 07:48:48 -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 ams.source.kernel.org (Postfix) with ESMTPS id DF2D4B82500; Fri, 1 Apr 2022 14:48:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68BC9C340F2; Fri, 1 Apr 2022 14:48:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648824525; bh=NrhotgYaEmvmytZ5SsnIyI+yW0k65GrkEjY84+HFvTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZB/zK2amGa9yqIXvO6ehMNAfVoIojcmYhyGWc0Vy53xWPuTQfxO3bygpV8SPy6PYx gifKrcQgYa9R4ov00CpCdH0/ouLO5Peeb1ZU+ktgdEP4QPaFNxDlk0KiihEKAjtjKn GX0+4W6rJk3mX+5jy/2QWJzvJfpDwid8cCxxhy3Id3yPo969n7nwHNR0owMc43mOB0 AMvI7fQEyXn4WcT7hXujyK5k9JFRIIKOGNB3C92RQYqhZDEb9skKRIb+4LnAAEVlvG q7WX6CxOu4dFTSIYDEI8IVIAVJ5/gn97WrHHDPAL8KAxYGLMPbKxbfH5Z/DHi4a/g9 FIzKjEExEeIxQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jordy Zomer , Jordy Zomer , Mike Snitzer , Sasha Levin , agk@redhat.com, snitzer@kernel.org, dm-devel@redhat.com Subject: [PATCH AUTOSEL 4.9 07/16] dm ioctl: prevent potential spectre v1 gadget Date: Fri, 1 Apr 2022 10:48:18 -0400 Message-Id: <20220401144827.1955845-7-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220401144827.1955845-1-sashal@kernel.org> References: <20220401144827.1955845-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jordy Zomer [ Upstream commit cd9c88da171a62c4b0f1c70e50c75845969fbc18 ] It appears like cmd could be a Spectre v1 gadget as it's supplied by a user and used as an array index. Prevent the contents of kernel memory from being leaked to userspace via speculative execution by using array_index_nospec. Signed-off-by: Jordy Zomer Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-ioctl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index eb2659a12310..70245782e7f6 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -16,6 +16,7 @@ #include #include #include +#include #include @@ -1642,6 +1643,7 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags) if (unlikely(cmd >= ARRAY_SIZE(_ioctls))) return NULL; + cmd = array_index_nospec(cmd, ARRAY_SIZE(_ioctls)); *ioctl_flags = _ioctls[cmd].flags; return _ioctls[cmd].fn; } -- 2.34.1