From patchwork Wed Aug 30 13:45:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 13370271 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 68F8DC6FA8F for ; Wed, 30 Aug 2023 13:46:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id ACED010E525; Wed, 30 Aug 2023 13:46:37 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 356E410E524 for ; Wed, 30 Aug 2023 13:46:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1693403191; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uG5M2Lwpie6cChdlBf2i1g6i8ozHuD8iPPR+2gMyfYc=; b=BY7VJof0QjqigpStiZgPE008ec1Pwqd9JQBEpTmWasug6HnaNMxnmp2zpkQJfXw+kSJEfy mQWmwsuxYvZpW0cqozp8NxQjQC1vn3B1r1k1Gbl6oeF8oRIyRbIQPsdzVoW6NICsktgtTt iRn1r2aMXZcX3f4PQdUOQP+2jfVuMt8= Received: from mail-ed1-f69.google.com (mail-ed1-f69.google.com [209.85.208.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-581-psNAjZ-vNIKZUoEbwj-f5A-1; Wed, 30 Aug 2023 09:46:30 -0400 X-MC-Unique: psNAjZ-vNIKZUoEbwj-f5A-1 Received: by mail-ed1-f69.google.com with SMTP id 4fb4d7f45d1cf-5219df4e8c4so757492a12.1 for ; Wed, 30 Aug 2023 06:46:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693403189; x=1694007989; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uG5M2Lwpie6cChdlBf2i1g6i8ozHuD8iPPR+2gMyfYc=; b=b+4RQhmuRTZIGVRwBN1CALszv4HSNspP3FyiVj0e+p9lY4lx/jC5kdOZT6wJhVvVOw D2c2aingvdFVjoh3vjkgEv8rQADL0iR2t7bEDdeiw9XLJVHsd+N0Cc+saA5SEZSCbZkz pGutj5IPv1vVYZ0aoDQbxtLoEel9e9+wyhiMF55ZppRnsqdDEneLrELetcO0PIU36G9L SP4Lbzn6emOu77IJGZnOwVWnt88/XVwx+3CWJBAyhFSKLH7uHwL9iDY9oTv4gjOaa2cP imSzjopjwQMeWRSsgT+pg4wdBDBzb7KYRCR1L89sEzxaRBzIiJnQXwYh+vCu02r8gEph bBsg== X-Gm-Message-State: AOJu0YxmfqsFe4jGmVitwxvEtgYVtoPfHM1k6rEIVl7TMYdurhpJGKhN YLz9dS8lyR/aPkebiMXxQKXmcEXRr5FzilHYDjWAk8oS4aocN3ERIfVqjXgCFYAXuDBHtXQXKsf rPJspzvOV45tVUsx57YvdAB67qBMH X-Received: by 2002:a05:6402:50cf:b0:522:e6b0:8056 with SMTP id h15-20020a05640250cf00b00522e6b08056mr1964352edb.4.1693403189066; Wed, 30 Aug 2023 06:46:29 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHpKYbKxrilyWwmvyGSQuR3YdE5ziBNReJitKpOxi4O0anKghb3+MxxX32nil6cbORrhxRuFQ== X-Received: by 2002:a05:6402:50cf:b0:522:e6b0:8056 with SMTP id h15-20020a05640250cf00b00522e6b08056mr1964344edb.4.1693403188914; Wed, 30 Aug 2023 06:46:28 -0700 (PDT) Received: from fedorinator.fritz.box ([2001:9e8:32e4:1500:aa40:e745:b6c9:7081]) by smtp.gmail.com with ESMTPSA id w23-20020aa7d297000000b0052595b17fd4sm6683260edq.26.2023.08.30.06.46.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 06:46:28 -0700 (PDT) From: Philipp Stanner To: Kees Cook , Andy Shevchenko , Eric Biederman , Christian Brauner , David Disseldorp , Luis Chamberlain , Siddh Raman Pant , Nick Alcock , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Zack Rusin Subject: [PATCH 2/5] kernel: kexec: copy user-array safely Date: Wed, 30 Aug 2023 15:45:53 +0200 Message-ID: <0a3f1bca273792edbdc41b64c454a6f7f499c9a8.1693386602.git.pstanner@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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: Philipp Stanner , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, VMware Graphics Reviewers , linux-hardening@vger.kernel.org, David Airlie Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 --- kernel/kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/kexec.c b/kernel/kexec.c index 92d301f98776..f6067c1bb089 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -242,7 +242,7 @@ 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);