From patchwork Wed Aug 18 06:05:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12443091 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C9BFC4338F for ; Wed, 18 Aug 2021 06:10:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5493C610C7 for ; Wed, 18 Aug 2021 06:10:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239546AbhHRGK6 (ORCPT ); Wed, 18 Aug 2021 02:10:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239399AbhHRGJm (ORCPT ); Wed, 18 Aug 2021 02:09:42 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58387C0612AB for ; Tue, 17 Aug 2021 23:06:03 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id u21-20020a17090a8915b02901782c36f543so8173666pjn.4 for ; Tue, 17 Aug 2021 23:06:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=NbUwFOYf9QoLFM9o1nAVztc6nEJjeod+Gi+09Yoftqs=; b=AA8Dm35avczwDjy1quR0mKKgLjJMquju7U+lNNFVsOZUn5KeyzjnQXjClbgpdlxX3v 2SCBsrMQ7ukd+uf8c6Etiiy64mFHHfp2eOjZzOj3u12Lg1Ng2Us4VyORw9XhVSTq8vtw HHhuGPccj0u5QnTYM0PtIjxC8fm4Xv9eP4lFk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=NbUwFOYf9QoLFM9o1nAVztc6nEJjeod+Gi+09Yoftqs=; b=NCF60GvSajQUMrOnwq27kD2JNRdrdpNllp8KoWyOaELsS8++kq+ZQeq3DORhSMWHQm lM6lsZweTjYBA+vD5bVphAte4hQyEDWbqb4a89gSE03YS8AksuByS3yjK5vnXZfwL748 1HyfeChkc4Ixn+hKYmXZB7pyDpmfUokZah+umwkaZ1wq/YUeSGjlBow4dI9JtXGQF1zf 9qZfbhOHoHTu/bL2ib2GWe0+WwMpZvGsNFHuaayjFo4rvS2WPyCWNH5N7FtOxEb1nGxd mYd7H7kUEYtpC7XxCNiQl+UosZWWyhoqg8mVk5ggOa9x/ZILDXA13Y8DsvMKcBgHayg3 RReA== X-Gm-Message-State: AOAM5331qNi8D2Hu9b50KXCDEItagt5ab6xPj9PphJXjsekO1OREvgrW kHnrDFI8SfOy8PvRhJ0ax8Oewg== X-Google-Smtp-Source: ABdhPJzgTBNMg0giRn1OlPz6IBm3E5s5bSOA2j6yOGDn8/0pIG8aKiyQ3az6o2cvg6kyztHJaHQzMQ== X-Received: by 2002:a17:902:d2c3:b0:12d:8ce5:5b7d with SMTP id n3-20020a170902d2c300b0012d8ce55b7dmr6022538plc.67.1629266762932; Tue, 17 Aug 2021 23:06:02 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id 20sm4769310pfi.170.2021.08.17.23.05.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:06:02 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Tyrel Datwyler , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 36/63] scsi: ibmvscsi: Avoid multi-field memset() overflow by aiming at srp Date: Tue, 17 Aug 2021 23:05:06 -0700 Message-Id: <20210818060533.3569517-37-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1793; h=from:subject; bh=5Fef3h9MfV87icL3aKSaHfIze5Oq4yInxr2gg/s9eAg=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMm17KLki3rqBaWpe95fASVBBQIIBI5vmXQYfcS JgzP+3CJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjJgAKCRCJcvTf3G3AJn/GEA C0g1tF3vBSATxFlt9g2MNVHox82GGsf3qtgn9DL9516BujVpZ6kxxymzVqHQLiePOpV9iTyZhh8bJP WPrCjTBFFiAdb9Faz4yuO9NudbXOZ+FexNaG3BvwuZOEhhxFRk3UBhjg0yj+oUvaQFJI+eTXM87IiX XGBr1KfDdlwjfoNhrhvn+4x2NL1tTH2qiRtqPMKANljnd20L8dSa0Zf11kG3d+/5Pg3jlBdf5oFQ4U LAOUjEVvApr+/BCqpBDdWYLpXpnN6wBAOl/UKC2lE4+Bma8jAela+AXthAZ4+UkXlllUyJC7CYFuYC nNiMaWOxnlHpbs9rLdSPcik2ntQ+SzdHUvwQ6D98tTmN5hOsvVqKypYT3ih1P0V3tx5tnqBrY3146X db+XSYqsKceUuA6bnZUACjEVi2zDnJZN/ekJ/ihxxqVKhs9MGGBJk2lEf1aYuZL0wluSpQwGxJSRs+ 3TlPDK7rkiGCZ7rOUhBMieRFjYzAx2KdDP5B2vjJOI/xopH9WIrkKC46i/Nbijs4Tk/P6zfRhrnq3h VCi/Zuk8ZQvxwMdoc18EPHLm7+Q+Sti54Kj1u5YIGU/ibkC2dYtnH1OTLV3w/X4I14RtR5sSFhYudo sHSg/VA5WHaBn3O1xg6slKTE5ifCxA4C+jndEj5364mN8eVDW0pyOK+Bp0vw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Instead of writing beyond the end of evt_struct->iu.srp.cmd, target the upper union (evt_struct->iu.srp) instead, as that's what is being wiped. Cc: Tyrel Datwyler Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Kees Cook Acked-by: Martin K. Petersen Link: https://lore.kernel.org/lkml/yq135rzp79c.fsf@ca-mkp.ca.oracle.com Acked-by: Tyrel Datwyler Link: https://lore.kernel.org/lkml/6eae8434-e9a7-aa74-628b-b515b3695359@linux.ibm.com --- drivers/scsi/ibmvscsi/ibmvscsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 50df7dd9cb91..ea8e01f49cba 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -1055,8 +1055,9 @@ static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, return SCSI_MLQUEUE_HOST_BUSY; /* Set up the actual SRP IU */ + BUILD_BUG_ON(sizeof(evt_struct->iu.srp) != SRP_MAX_IU_LEN); + memset(&evt_struct->iu.srp, 0x00, sizeof(evt_struct->iu.srp)); srp_cmd = &evt_struct->iu.srp.cmd; - memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); srp_cmd->opcode = SRP_CMD; memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); int_to_scsilun(lun, &srp_cmd->lun);