From patchwork Tue Jul 27 20:58:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 488383 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=-19.5 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=ham 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 28EDAC4338F for ; Tue, 27 Jul 2021 21:17:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14CB760BD3 for ; Tue, 27 Jul 2021 21:17:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233990AbhG0VRW (ORCPT ); Tue, 27 Jul 2021 17:17:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232888AbhG0VRC (ORCPT ); Tue, 27 Jul 2021 17:17:02 -0400 Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6033C0617BD for ; Tue, 27 Jul 2021 14:17:00 -0700 (PDT) Received: by mail-pl1-x635.google.com with SMTP id t21so9034plr.13 for ; Tue, 27 Jul 2021 14:17:00 -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=Y9wMesWb3kMvGhORYmMr8FR6o9+jwEvZSo1EsZxY8W0=; b=BN7P01Ur0nT1MgFEaFehSRb7jJppIMvpuqQP+s+oBiWS7VXbf/RvYexr0Hx4+J+tRF ub6d2NuQ/h6uhZ5C5OC3+rwkID8I367GLLdmYSUSQoeXhXVWNYV2m0sd3TTyLfRvYZRi tIFkyuHmHnqC70kWh05pztablIQYnYXX+GWGQ= 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=Y9wMesWb3kMvGhORYmMr8FR6o9+jwEvZSo1EsZxY8W0=; b=HiB/mZy/UChCAmdzkZItjPBGe1f3qhA/YE6yI2UbUIZKvjgntXfWltQ3fCOtu7CgZ7 4av2YNPsEieafq5Glfdszl9pDUVocV/yqGWuV5GjPrciDe7u5UPD9vB7CAot0FBETAEG 59x7hNkQ7NnYFXLbElNupsyjMA4F/qhSz2CXPxzSACIsd1Zb3e7Z2SNzoLilD81xAAMs H4CxZlsXqE4aGJIq1xIqgfe5mRq1JP3EvGKtzIJeEvu/onTJGfIMXAw3P3vdHG2vofA6 P/oCDqX0bLl6qrGZujlHQl0HLuKICADLELR6w4W+fyPypXj0Wa1Yrj1+V5Rk5mbLrllR Ydzw== X-Gm-Message-State: AOAM531tvtVmbKnALJUpyz8m6WY6+7VVyYiLnUL6KmdXiA8KavoC9/Ca q2PtLKW/NrMKKEg/6Ysu5+iDCQ== X-Google-Smtp-Source: ABdhPJwBzhqNz9CV9N0TSyJ7ZTBhPPhkncXxe8pHuZBIHnuiml3joPIijrND7KmjOEKulsBBdR6JNQ== X-Received: by 2002:a62:584:0:b029:32e:3b57:a1c6 with SMTP id 126-20020a6205840000b029032e3b57a1c6mr24589168pff.13.1627420620372; Tue, 27 Jul 2021 14:17:00 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id lk5sm3712997pjb.53.2021.07.27.14.16.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:16:58 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, 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 Subject: [PATCH 58/64] powerpc: Split memset() to avoid multi-field overflow Date: Tue, 27 Jul 2021 13:58:49 -0700 Message-Id: <20210727205855.411487-59-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=970; h=from:subject; bh=EqAYyR61If64Fj2IYKFg3jD8wd3YsI3R0DZAgupjjpE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHON8m2NPAIDr9Q/N7SXLMGlDKKJPMFM5SUAuhto 7+vlDg+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzjQAKCRCJcvTf3G3AJq+CEA Ca4qR9dFfukeDpwBivSWmdN4IXrLxxds4i79tyF2RZ1NetlF3zQFjf0dOJJ6NfqCZjinnNwHjnPaFi 9x4UwneOOuPj/4rf8k7cSpmM2UreUaAAA8VP/jFKg8vdwSBqelmbZjm8ng/qha6pxe9jqRvhE2RWKP qnrUYIUXlqe7N3FgL/8eOB67y/Un3Rfqu05z/doNPDcGWYTfIhpaZu3n+amLx44YduL03EwcMECH/l NDarqGZ78zXiW9XBAw38H8M3+unTerG5RPPulpFMa3XJ+hy0ln0RAD/CKthoOCrGmjVHEls689FYmk 47Xi02bCJdYfIgjqNVNZcc95yunNV29nLCcUCjqRA9qZpvkMrJWQANAATLtxAcI+/txMZUwS94jUFC otBX6K+dP0tshHI5p9QXMMjeOFJUZsvIm5n+eNLtqZADzbxH5992mbjlaJZzSynXuRU7LnKYFwp99u ACzU3xk+GoPHSQbfn0SU7L/H8QNlNuzxIiWmgfUKY2AXa7GfFeO+JPWTK/H/PczC9Or0vmzcwp+j06 gmLqgbtlJS5EyLTqxwdJDfRPF9CCi/hV2nu4l+oo6Pue1qSXQEmcxzqGPzn+HR7xkb5suJeevW+l7Z gDF++XCKaI8rWqYNDAdfLYj6eQLBZMJ8AM/75DxdC9t3gUyhjbCYaLueTqow== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@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 across a field boundary with memset(), move the call to just the array, and an explicit zeroing of the prior field. Signed-off-by: Kees Cook Reviewed-by: Michael Ellerman --- drivers/macintosh/smu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c index 94fb63a7b357..59ce431da7ef 100644 --- a/drivers/macintosh/smu.c +++ b/drivers/macintosh/smu.c @@ -848,7 +848,8 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd) cmd->read = cmd->info.devaddr & 0x01; switch(cmd->info.type) { case SMU_I2C_TRANSFER_SIMPLE: - memset(&cmd->info.sublen, 0, 4); + cmd->info.sublen = 0; + memset(&cmd->info.subaddr, 0, 3); break; case SMU_I2C_TRANSFER_COMBINED: cmd->info.devaddr &= 0xfe;