From nobody Fri Dec 19 03:43:36 2025 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 63FB8C83F1A for ; Wed, 30 Aug 2023 18:53:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243921AbjH3SuV (ORCPT ); Wed, 30 Aug 2023 14:50:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244704AbjH3NrN (ORCPT ); Wed, 30 Aug 2023 09:47:13 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3915C107 for ; Wed, 30 Aug 2023 06:46:32 -0700 (PDT) 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uG5M2Lwpie6cChdlBf2i1g6i8ozHuD8iPPR+2gMyfYc=; b=g/l+PkCMGx9sWGN5eBN5jsf85xnUUfy66IrogE2JUurfNX5H1PCw4Pkb8dY/SuMPQdfx3y u6i6dnlH1+P0Bv7CSUxPxSSqLiblE4QCq7PjVdWTV8eh9N2vSZ/Kx/dqASPvxDatARsPC/ iCyMh88PSSvBVr77qVs4RyBvKOb4B+w= Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-50-HoSfqRSvNyOmys1Ht87gBg-1; Wed, 30 Aug 2023 09:46:30 -0400 X-MC-Unique: HoSfqRSvNyOmys1Ht87gBg-1 Received: by mail-ed1-f70.google.com with SMTP id 4fb4d7f45d1cf-51e3bb0aeedso757014a12.0 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=WF+6yazI3VMfQO3YCGesmgftJRjEOdVg27wmzYjsAvL0G9uUb0kdw/bFOLnDIfQhzE ZY7KCzfngwyX/Lwgw0yxH+jbTkCQvrLusxOF0zb5I/lO7JKiGbGMhdDxO7WlBGnMp9Yl WDSCRaFsscTIyQWlNESYElF49bi4fBlIAQ+5gAVaxaYh8BGm1pHdxBPHKGL8o+g8o+IS 2CfhWkBon0Mzswp/NQ93Xx71xAYgkpHZohW5MgUalL0AYQ6cN447b9JfgzwmEqLNksjp odt5G1oAlnTRgv8ehU4anpgvqKX/CCto0KYID9B62h8I9ruWXKJYjwJr52a9hy5rJM/6 OtKw== X-Gm-Message-State: AOJu0Yync4nsffJ5Y3cY3cG4+908GV3wdSv4fpnY+X1qQhSgWZWznwUp ZrUCWGK/MoXU6XFMwY9b+sX7jBsWPK6n579YHEH/YNb86RuJ42hL36XN9XWlZcE6Smcws5owxQ8 gbC3b1YGDY2Jx+TCSzdqjfYOY X-Received: by 2002:a05:6402:50cf:b0:522:e6b0:8056 with SMTP id h15-20020a05640250cf00b00522e6b08056mr1964356edb.4.1693403189068; 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 Cc: VMware Graphics Reviewers , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-hardening@vger.kernel.org, Philipp Stanner , David Airlie 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 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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, unsig= ned long, nr_segments, ((flags & KEXEC_ARCH_MASK) !=3D KEXEC_ARCH_DEFAULT)) return -EINVAL; =20 - ksegments =3D memdup_user(segments, nr_segments * sizeof(ksegments[0])); + ksegments =3D memdup_array_user(segments, nr_segments, sizeof(ksegments[0= ])); if (IS_ERR(ksegments)) return PTR_ERR(ksegments); =20 --=20 2.41.0