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 04838C83F26 for ; Wed, 30 Aug 2023 18:46:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243088AbjH3Spd (ORCPT ); Wed, 30 Aug 2023 14:45:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57188 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244703AbjH3NrN (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 6E765AC for ; Wed, 30 Aug 2023 06:46:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1693403184; 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; bh=PzqfQ88022ZJBnlN9XJGH4Rch2pPLUTbjECBn8E9VEk=; b=Ztml5sFOOPQeYDksDDIoM+No/re9m3mOrxv3ddiUB4Z3lBKHwHghwl3qeUh82qhXM+40Iz T90dfwSKyHSkWQIiJxWVzktT07WtLYPFFRrR9i0QKkUCcW26wLyifDS/bT35xnJ9x0NjiU 7sf7R6/X/gtEJil8j1RmzFRqnpVaQd8= Received: from mail-lj1-f197.google.com (mail-lj1-f197.google.com [209.85.208.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-310-5qmow3ZUNlKsJGgiqqG8rQ-1; Wed, 30 Aug 2023 09:46:23 -0400 X-MC-Unique: 5qmow3ZUNlKsJGgiqqG8rQ-1 Received: by mail-lj1-f197.google.com with SMTP id 38308e7fff4ca-2b9cca3c395so19428221fa.1 for ; Wed, 30 Aug 2023 06:46:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693403181; x=1694007981; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=PzqfQ88022ZJBnlN9XJGH4Rch2pPLUTbjECBn8E9VEk=; b=FTNsXQ5c51Kkd2cyOxIpgKt5Kp18imwHLd43dKTlsLXHaacz2O/ly28KgH99vr3ER7 hcH/5OL+6JPf3iYKyrN7EZCrb2vt6A7H6AaeyCpKd4+9w6VUNdvvAYA426cZ8ccF4NE+ dX05Y7NkZkXi3XDdBkobKg5ASPUXts+PjB6n3DfNuZyto+DTsBa++LbaJgKkNWsQT3jy o21LqeENLEq6tR4SrB6Rfi0qzPP44+Tu78eGQE+6Jvjr6v5EDvkheM/d46ZsACrEcGQl dpPLkBVrhbwTL4pU4Zdsr4slBL/V3KPhIVMXiqc1RtwNu688Y3ROTOgURk/rO62qVS05 /Sbg== X-Gm-Message-State: AOJu0YwBZoUzvI50DNmFsc72FjF8Pheg/cFh6QKhGhVVkwEc/JjSSm+W 5RAF/k97Y8ibF09G16gu7NKPcKSruqAgIip6eqNDayfu2vALJA37zhSKzGuwnUZWoBfDtyHvk5M eTut1eIASUjsFlN6hpiz1Nu7i X-Received: by 2002:a05:651c:201b:b0:2bb:8d47:9d95 with SMTP id s27-20020a05651c201b00b002bb8d479d95mr1564052ljo.2.1693403181697; Wed, 30 Aug 2023 06:46:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFj7gH1IKBMS0NWbE4Xd4vUNDX4WI+F2xE2mn0UylTciMqkBXPKro8KLHlIW5rak33HRcstNQ== X-Received: by 2002:a05:651c:201b:b0:2bb:8d47:9d95 with SMTP id s27-20020a05651c201b00b002bb8d479d95mr1564026ljo.2.1693403181300; Wed, 30 Aug 2023 06:46:21 -0700 (PDT) Received: from fedorinator.fritz.box ([2001:9e8:32e4:1500:aa40:e745:b6c9:7081]) by smtp.gmail.com with ESMTPSA id t26-20020a1709063e5a00b009829dc0f2a0sm7174346eji.111.2023.08.30.06.46.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 06:46:20 -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 Subject: [PATCH 0/5] Introduce new wrappers to copy user-arrays Date: Wed, 30 Aug 2023 15:45:51 +0200 Message-ID: X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! David Airlie suggested that we could implement new wrappers around (v)memdup_user() for duplicating user arrays. This small patch series first implements the two new wrapper functions memdup_array_user() and vmemdup_array_user(). They calculate the array-sizes safely, i.e., they return an error in case of an overflow. It then implements the new wrappers in two components in kernel/ and two in the drm-subsystem. In total, there are 18 files in the kernel that use (v)memdup_user() to duplicate arrays. My plan is to provide patches for the other 14 successively once this series has been merged. P. Philipp Stanner (5): string.h: add array-wrappers for (v)memdup_user() kernel: kexec: copy user-array safely kernel: watch_queue: copy user-array safely drm_lease.c: copy user-array safely drm: vmgfx_surface.c: copy user-array safely drivers/gpu/drm/drm_lease.c | 4 +-- drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 +-- include/linux/string.h | 42 +++++++++++++++++++++++++ kernel/kexec.c | 2 +- kernel/watch_queue.c | 2 +- 5 files changed, 48 insertions(+), 6 deletions(-) -- 2.41.0