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 33019C4332F for ; Tue, 7 Nov 2023 12:42:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235350AbjKGMmZ (ORCPT ); Tue, 7 Nov 2023 07:42:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235353AbjKGMmC (ORCPT ); Tue, 7 Nov 2023 07:42:02 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0187828FF4; Tue, 7 Nov 2023 04:29:56 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E98CC433CA; Tue, 7 Nov 2023 12:29:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699360196; bh=D1PYTQZiTV/3FHNcwcS5n1/vZC1HqQlHbF/tyBrUkkg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CPR/Y1fURlGZj6dofCV3TXi5LEmG5gQ0k8Ebp9UX6tbeb8l4UpUj/gUXBaAXoSsNi sGP9vZ5TYxiduc6S5tteqxa1X/QuMWpZiYjhAMJti+ZElos1IIWm+jJRlH/qmVFxRC ekl3hyuisQXdaS+AdCZPjVEOG+J566dMzKeitB1+mDqGEyb852RIhVu4dFSwqY5JA1 76rqFgEQSVjwY0Qdgq7RaMxnz4YX0r/ipdiWAfq7EGmcAN5sVqixNg8vJPZYRDeXqw t2kMkMX6sRlzbE1B8S7UWYcDQLeVhE43yAp7woH4LdSxBcYWtQRe7yqgBAAAeWiyRi W2YaMKOBbYsjA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philipp Stanner , David Airlie , Baoquan He , Kees Cook , Zack Rusin , Sasha Levin , ebiederm@xmission.com, kexec@lists.infradead.org Subject: [PATCH AUTOSEL 5.15 05/20] kernel: kexec: copy user-array safely Date: Tue, 7 Nov 2023 07:28:59 -0500 Message-ID: <20231107122940.3762228-5-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107122940.3762228-1-sashal@kernel.org> References: <20231107122940.3762228-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.137 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Philipp Stanner [ Upstream commit 569c8d82f95eb5993c84fb61a649a9c4ddd208b3 ] Currently, there is no overflow-check with memdup_user(). Use the new function memdup_array_user() instead of memdup_user() for duplicating the user-space array safely. Suggested-by: David Airlie Signed-off-by: Philipp Stanner Acked-by: Baoquan He Reviewed-by: Kees Cook Reviewed-by: Zack Rusin Signed-off-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-4-pstanner@redhat.com Signed-off-by: Sasha Levin --- kernel/kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index cb8e6e6f983c7..5ff1dcc4acb78 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -240,7 +240,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) return -EINVAL; - ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0])); + ksegments = memdup_array_user(segments, nr_segments, sizeof(ksegments[0])); if (IS_ERR(ksegments)) return PTR_ERR(ksegments); -- 2.42.0