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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 58174C07E9B for ; Tue, 6 Jul 2021 11:17:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43F7A61CDB for ; Tue, 6 Jul 2021 11:17:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232943AbhGFLUf (ORCPT ); Tue, 6 Jul 2021 07:20:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:54440 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232473AbhGFLSW (ORCPT ); Tue, 6 Jul 2021 07:18:22 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3C22061A14; Tue, 6 Jul 2021 11:15:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570143; bh=co4ViAOkLJgTbOD/bShjc5Cfzwin0PgwlTQtXi3wqAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BGhBJe5iC+A/EeGQvdeuD3ldn7FcQIm7X1Y8PFq8zz8KEbcCRuyKB2uO99KEvZwtq NmXolCL0KlEKDwekCSTsnaueYLt9AudlfX5BeMoeOC1iey9t9HtdnRMALBuDyIT7PU xcanBjFAJEmAaRfXzXGxYi5byTYoPAz8CZ9ySMXs4mUV7M/RhaQcqgE1UauPap/gZ2 ZAsMgk/UuAjJvpJGMMap52eEu9+7KwV2cXq83i5YPd1vj4ev3Hx1OcMNhA6zZMBgRL NG1KFiUqAUuBC71HSfFDZrWKG9ctuJ+5uA+8NjALssc8CpnLw/CRSB+LF3xA/sDu+s PGXJsO8T3FMtA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kees Cook , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.13 068/189] drm/amd/display: Avoid HDCP over-read and corruption Date: Tue, 6 Jul 2021 07:12:08 -0400 Message-Id: <20210706111409.2058071-68-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org> References: <20210706111409.2058071-1-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: Kees Cook [ Upstream commit 06888d571b513cbfc0b41949948def6cb81021b2 ] Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64. Signed-off-by: Kees Cook Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c index 2cbd931363bd..6d26d9c63ab2 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c @@ -29,8 +29,10 @@ static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp) { uint64_t n = 0; uint8_t count = 0; + u8 bksv[sizeof(n)] = { }; - memcpy(&n, hdcp->auth.msg.hdcp1.bksv, sizeof(uint64_t)); + memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv)); + n = *(uint64_t *)bksv; while (n) { count++; -- 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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 7338AC11F7E for ; Tue, 6 Jul 2021 11:15:50 +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 436AB61C6A for ; Tue, 6 Jul 2021 11:15:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 436AB61C6A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3DDB86E0D2; Tue, 6 Jul 2021 11:15:46 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1AECB6E0CF; Tue, 6 Jul 2021 11:15:44 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 3C22061A14; Tue, 6 Jul 2021 11:15:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570143; bh=co4ViAOkLJgTbOD/bShjc5Cfzwin0PgwlTQtXi3wqAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BGhBJe5iC+A/EeGQvdeuD3ldn7FcQIm7X1Y8PFq8zz8KEbcCRuyKB2uO99KEvZwtq NmXolCL0KlEKDwekCSTsnaueYLt9AudlfX5BeMoeOC1iey9t9HtdnRMALBuDyIT7PU xcanBjFAJEmAaRfXzXGxYi5byTYoPAz8CZ9ySMXs4mUV7M/RhaQcqgE1UauPap/gZ2 ZAsMgk/UuAjJvpJGMMap52eEu9+7KwV2cXq83i5YPd1vj4ev3Hx1OcMNhA6zZMBgRL NG1KFiUqAUuBC71HSfFDZrWKG9ctuJ+5uA+8NjALssc8CpnLw/CRSB+LF3xA/sDu+s PGXJsO8T3FMtA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 068/189] drm/amd/display: Avoid HDCP over-read and corruption Date: Tue, 6 Jul 2021 07:12:08 -0400 Message-Id: <20210706111409.2058071-68-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org> References: <20210706111409.2058071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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: Alex Deucher , Sasha Levin , dri-devel@lists.freedesktop.org, Kees Cook , amd-gfx@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Kees Cook [ Upstream commit 06888d571b513cbfc0b41949948def6cb81021b2 ] Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64. Signed-off-by: Kees Cook Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c index 2cbd931363bd..6d26d9c63ab2 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c @@ -29,8 +29,10 @@ static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp) { uint64_t n = 0; uint8_t count = 0; + u8 bksv[sizeof(n)] = { }; - memcpy(&n, hdcp->auth.msg.hdcp1.bksv, sizeof(uint64_t)); + memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv)); + n = *(uint64_t *)bksv; while (n) { count++; -- 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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 7EDA0C11F72 for ; Tue, 6 Jul 2021 11:15:48 +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 1861A61C4C for ; Tue, 6 Jul 2021 11:15:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1861A61C4C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8C4E26E0CF; Tue, 6 Jul 2021 11:15:45 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1AECB6E0CF; Tue, 6 Jul 2021 11:15:44 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 3C22061A14; Tue, 6 Jul 2021 11:15:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570143; bh=co4ViAOkLJgTbOD/bShjc5Cfzwin0PgwlTQtXi3wqAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BGhBJe5iC+A/EeGQvdeuD3ldn7FcQIm7X1Y8PFq8zz8KEbcCRuyKB2uO99KEvZwtq NmXolCL0KlEKDwekCSTsnaueYLt9AudlfX5BeMoeOC1iey9t9HtdnRMALBuDyIT7PU xcanBjFAJEmAaRfXzXGxYi5byTYoPAz8CZ9ySMXs4mUV7M/RhaQcqgE1UauPap/gZ2 ZAsMgk/UuAjJvpJGMMap52eEu9+7KwV2cXq83i5YPd1vj4ev3Hx1OcMNhA6zZMBgRL NG1KFiUqAUuBC71HSfFDZrWKG9ctuJ+5uA+8NjALssc8CpnLw/CRSB+LF3xA/sDu+s PGXJsO8T3FMtA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 068/189] drm/amd/display: Avoid HDCP over-read and corruption Date: Tue, 6 Jul 2021 07:12:08 -0400 Message-Id: <20210706111409.2058071-68-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org> References: <20210706111409.2058071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alex Deucher , Sasha Levin , dri-devel@lists.freedesktop.org, Kees Cook , amd-gfx@lists.freedesktop.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Kees Cook [ Upstream commit 06888d571b513cbfc0b41949948def6cb81021b2 ] Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64. Signed-off-by: Kees Cook Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c index 2cbd931363bd..6d26d9c63ab2 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c @@ -29,8 +29,10 @@ static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp) { uint64_t n = 0; uint8_t count = 0; + u8 bksv[sizeof(n)] = { }; - memcpy(&n, hdcp->auth.msg.hdcp1.bksv, sizeof(uint64_t)); + memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv)); + n = *(uint64_t *)bksv; while (n) { count++; -- 2.30.2 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx