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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id d67sm4856651pfd.81.2021.07.27.14.06.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:50 -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 40/64] net: 802: Use memset_after() to clear struct fields Date: Tue, 27 Jul 2021 13:58:31 -0700 Message-Id: <20210727205855.411487-41-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=1002; h=from:subject; bh=W7mlz4eEFjlHgTTisxMegB0ZhUGQYb0aFf/Mmy3UOio=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOJorvZuoNL45b35HsPI1mAinyEnA8ZX78L8pdJ 8EQ0wWuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziQAKCRCJcvTf3G3AJi3aD/ 9pKVrL7GGdaVZl4FyfYev6TME/fJq+q9IgkVKQ6QCoKY5T/n8lqb9wXu0sEDlYK/V1GqgYIyOt/r7B kfASageiRvyRg6nT+2AFkSJGPmwhPkUx2C0pnq6h2eqXzqar9s8LCEi8fZCrBkXObTwmGt5Elv2lL9 u3iRYv/VfrwevBjfH2MskR4OJDtdPLapzgjtDpmesjJgIuFqbLVbP0StJ/6qcp3046MFgobYGk5guX yTH4PNsJHtyrgdozwjttdVzeuhBt2WzgJQ1eaObNsLLLG37mPRxwCItRBkCwVkgMqOjQ4hE4IYAhXt A46hMy1iM0tpGB/EfZqHobJSxHkdDF8gcTzETtHJpWWBZYyLUvM2XIQ/jR1mne6xOpVdLMQUFxCFnn mY2w5SBcpciTvwuit/vfLui8lZtt29yIVecQbgt9pRHcNcLDYVr8lSjPmpO/H/Ey43fgftvpDaUE1K kZYNcM8o3ZI3ko0BO+gOPvhnYi1Hhu7xktOgZx9M3VFKye7+Rx5Hna1V2YsePjXkMGHbDlKaxCDbwc Es30R4/sgZcQr1pAtYhRgMIV9sd0TuiSf3pQyy3q5FvtNiOSMBvVO2cVjj+RDAqI4SNkvoAH2zrvou WNPNye5apRTKo4NrCQk68ENprSWgvKWfzUOE9H92IsOJCSP1oSa6QuA89TCQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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. Use memset_after() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Signed-off-by: Kees Cook --- net/802/hippi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/802/hippi.c b/net/802/hippi.c index f80b33a8f7e0..00f6666b4b16 100644 --- a/net/802/hippi.c +++ b/net/802/hippi.c @@ -65,7 +65,7 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev, hip->le.src_addr_type = 2; /* 12 bit SC address */ memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); - memset(&hip->le.reserved, 0, 16); + memset_after(&hip->le, 0, src_switch_addr); hip->snap.dsap = HIPPI_EXTENDED_SAP; hip->snap.ssap = HIPPI_EXTENDED_SAP; -- 2.30.2 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 X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 14A5DC4320A for ; Tue, 27 Jul 2021 21:06:54 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C71CA60F90 for ; Tue, 27 Jul 2021 21:06:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C71CA60F90 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 008BB6E827; Tue, 27 Jul 2021 21:06:53 +0000 (UTC) Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by gabe.freedesktop.org (Postfix) with ESMTPS id C50816E170 for ; Tue, 27 Jul 2021 21:06:51 +0000 (UTC) Received: by mail-pj1-x1033.google.com with SMTP id j1so1815274pjv.3 for ; Tue, 27 Jul 2021 14:06:51 -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=ix+5YCGgtf4ASFZ4v/FG8sEQnqankYDKBfCTYQuGyCQ=; b=bnW6f5ZW6PRNMZTriXsLXCjk+oTRJuSSLMLz4NTDsbeQQuOz8avWkiTWuVD5pzhNMg iYCqb4IKkBB7T/0UQWl/ua4svjdGwPBZ+rR0OQm74+vwXdPpiJrnKVlZXTKACJK+Udlc zOJKY2stD38NmwWjsipdZ/+lTjPzW1nI+JqKk= 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=ix+5YCGgtf4ASFZ4v/FG8sEQnqankYDKBfCTYQuGyCQ=; b=EZLBY/gNHy9U56+w5Y5IZulae956gJgJ3ze/kzbI1tSIn7fz3rT3wHTa8xlOZtJAaf nXnMZuz3mgkjUZlzffIhEEDffPTPQ4j/0qPuOn0PS7hVUSANUpSQuTNooZO93jrVt/rE 3gUmGOi5tQfknpNI1iUg61dsUCOooAZidiYT6XoGllycLu8qkZxjYnLO+3/P6RtcvIi6 0Bwo66cAsSeAmhmPbDIhxjBSCh30WpZhWqXmhCf7ovhG2UJ3LeClD9dmqBLw92GJV932 YdP62MYYp1f24R1USZeap9m9BMhqLTlcytpDc2Slv4cyZu25b+GIBPhbnv16lXtNnZ31 GEmw== X-Gm-Message-State: AOAM533lVMRrRR8m/L2dGobEdnvvbOf521L2ug/1Bwmp0NW3fPYig1O4 xI3c/PBzUmRMqBvbQ5pGd9HTLw== X-Google-Smtp-Source: ABdhPJwjggurGSKfII6BwItVhzcFMZ6EXwHYvl5td/Q0hyu7n7FMd1AYamrRsA+/bObA3M9juNtcYg== X-Received: by 2002:a63:ee11:: with SMTP id e17mr25530642pgi.323.1627420011461; Tue, 27 Jul 2021 14:06:51 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id d67sm4856651pfd.81.2021.07.27.14.06.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:50 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Subject: [PATCH 40/64] net: 802: Use memset_after() to clear struct fields Date: Tue, 27 Jul 2021 13:58:31 -0700 Message-Id: <20210727205855.411487-41-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=1002; h=from:subject; bh=W7mlz4eEFjlHgTTisxMegB0ZhUGQYb0aFf/Mmy3UOio=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOJorvZuoNL45b35HsPI1mAinyEnA8ZX78L8pdJ 8EQ0wWuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziQAKCRCJcvTf3G3AJi3aD/ 9pKVrL7GGdaVZl4FyfYev6TME/fJq+q9IgkVKQ6QCoKY5T/n8lqb9wXu0sEDlYK/V1GqgYIyOt/r7B kfASageiRvyRg6nT+2AFkSJGPmwhPkUx2C0pnq6h2eqXzqar9s8LCEi8fZCrBkXObTwmGt5Elv2lL9 u3iRYv/VfrwevBjfH2MskR4OJDtdPLapzgjtDpmesjJgIuFqbLVbP0StJ/6qcp3046MFgobYGk5guX yTH4PNsJHtyrgdozwjttdVzeuhBt2WzgJQ1eaObNsLLLG37mPRxwCItRBkCwVkgMqOjQ4hE4IYAhXt A46hMy1iM0tpGB/EfZqHobJSxHkdDF8gcTzETtHJpWWBZYyLUvM2XIQ/jR1mne6xOpVdLMQUFxCFnn mY2w5SBcpciTvwuit/vfLui8lZtt29yIVecQbgt9pRHcNcLDYVr8lSjPmpO/H/Ey43fgftvpDaUE1K kZYNcM8o3ZI3ko0BO+gOPvhnYi1Hhu7xktOgZx9M3VFKye7+Rx5Hna1V2YsePjXkMGHbDlKaxCDbwc Es30R4/sgZcQr1pAtYhRgMIV9sd0TuiSf3pQyy3q5FvtNiOSMBvVO2cVjj+RDAqI4SNkvoAH2zrvou WNPNye5apRTKo4NrCQk68ENprSWgvKWfzUOE9H92IsOJCSP1oSa6QuA89TCQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , linux-kbuild@vger.kernel.org, Greg Kroah-Hartman , linux-staging@lists.linux.dev, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, "Gustavo A. R. Silva" , linux-block@vger.kernel.org, clang-built-linux@googlegroups.com, Keith Packard , netdev@vger.kernel.org, Andrew Morton Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Use memset_after() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Signed-off-by: Kees Cook --- net/802/hippi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/802/hippi.c b/net/802/hippi.c index f80b33a8f7e0..00f6666b4b16 100644 --- a/net/802/hippi.c +++ b/net/802/hippi.c @@ -65,7 +65,7 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev, hip->le.src_addr_type = 2; /* 12 bit SC address */ memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); - memset(&hip->le.reserved, 0, 16); + memset_after(&hip->le, 0, src_switch_addr); hip->snap.dsap = HIPPI_EXTENDED_SAP; hip->snap.ssap = HIPPI_EXTENDED_SAP; -- 2.30.2