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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 A9CD8C433EF for ; Mon, 20 Sep 2021 18:42:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DA3F61211 for ; Mon, 20 Sep 2021 18:42:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381809AbhITSnh (ORCPT ); Mon, 20 Sep 2021 14:43:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:53088 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381521AbhITSia (ORCPT ); Mon, 20 Sep 2021 14:38:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BED4461465; Mon, 20 Sep 2021 17:30:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632159016; bh=0I9fSVzAffHneJnq+oY27ZVSWwKgWxtyDoF/GpHxxMI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pcHNiokQS+p0/uxy5SZZasZ78hqnleXPxfSnIWqhJDKwcdcrdrW35KXwub/yWBeM5 vuOUl/qpUSqqq8PS4LHv0aeywUHRxvchgTAYKwtqSz28jc9h3ElkiB6e/GUsom2pK2 OPyyo3Y/apgObkORfgJmJcox7/LK2u3JLmkE89Qw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shannon Nelson , Arnd Bergmann , Christoph Hellwig , Saeed Mahameed , "David S. Miller" Subject: [PATCH 5.14 038/168] ethtool: Fix rxnfc copy to user buffer overflow Date: Mon, 20 Sep 2021 18:42:56 +0200 Message-Id: <20210920163922.897273501@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163921.633181900@linuxfoundation.org> References: <20210920163921.633181900@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Saeed Mahameed commit 9b29a161ef38040f000dcf9ccf78e34495edfd55 upstream. In the cited commit, copy_to_user() got called with the wrong pointer, instead of passing the actual buffer ptr to copy from, a pointer to the pointer got passed, which causes a buffer overflow calltrace to pop up when executing "ethtool -x ethX". Fix ethtool_rxnfc_copy_to_user() to use the rxnfc pointer as passed to the function, instead of a pointer to it. This fixes below call trace: [ 15.533533] ------------[ cut here ]------------ [ 15.539007] Buffer overflow detected (8 < 192)! [ 15.544110] WARNING: CPU: 3 PID: 1801 at include/linux/thread_info.h:200 copy_overflow+0x15/0x20 [ 15.549308] Modules linked in: [ 15.551449] CPU: 3 PID: 1801 Comm: ethtool Not tainted 5.14.0-rc2+ #1058 [ 15.553919] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 15.558378] RIP: 0010:copy_overflow+0x15/0x20 [ 15.560648] Code: e9 7c ff ff ff b8 a1 ff ff ff eb c4 66 0f 1f 84 00 00 00 00 00 55 48 89 f2 89 fe 48 c7 c7 88 55 78 8a 48 89 e5 e8 06 5c 1e 00 <0f> 0b 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 [ 15.565114] RSP: 0018:ffffad49c0523bd0 EFLAGS: 00010286 [ 15.566231] RAX: 0000000000000000 RBX: 00000000000000c0 RCX: 0000000000000000 [ 15.567616] RDX: 0000000000000001 RSI: ffffffff8a7912e7 RDI: 00000000ffffffff [ 15.569050] RBP: ffffad49c0523bd0 R08: ffffffff8ab2ae28 R09: 00000000ffffdfff [ 15.570534] R10: ffffffff8aa4ae40 R11: ffffffff8aa4ae40 R12: 0000000000000000 [ 15.571899] R13: 00007ffd4cc2a230 R14: ffffad49c0523c00 R15: 0000000000000000 [ 15.573584] FS: 00007f538112f740(0000) GS:ffff96d5bdd80000(0000) knlGS:0000000000000000 [ 15.575639] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.577092] CR2: 00007f5381226d40 CR3: 0000000013542000 CR4: 00000000001506e0 [ 15.578929] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 15.580695] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 15.582441] Call Trace: [ 15.582970] ethtool_rxnfc_copy_to_user+0x30/0x46 [ 15.583815] ethtool_get_rxnfc.cold+0x23/0x2b [ 15.584584] dev_ethtool+0x29c/0x25f0 [ 15.585286] ? security_netlbl_sid_to_secattr+0x77/0xd0 [ 15.586728] ? do_set_pte+0xc4/0x110 [ 15.587349] ? _raw_spin_unlock+0x18/0x30 [ 15.588118] ? __might_sleep+0x49/0x80 [ 15.588956] dev_ioctl+0x2c1/0x490 [ 15.589616] sock_ioctl+0x18e/0x330 [ 15.591143] __x64_sys_ioctl+0x41c/0x990 [ 15.591823] ? irqentry_exit_to_user_mode+0x9/0x20 [ 15.592657] ? irqentry_exit+0x33/0x40 [ 15.593308] ? exc_page_fault+0x32f/0x770 [ 15.593877] ? exit_to_user_mode_prepare+0x3c/0x130 [ 15.594775] do_syscall_64+0x35/0x80 [ 15.595397] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 15.596037] RIP: 0033:0x7f5381226d4b [ 15.596492] Code: 0f 1e fa 48 8b 05 3d b1 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 0d b1 0c 00 f7 d8 64 89 01 48 [ 15.598743] RSP: 002b:00007ffd4cc2a1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 15.599804] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5381226d4b [ 15.600795] RDX: 00007ffd4cc2a350 RSI: 0000000000008946 RDI: 0000000000000003 [ 15.601712] RBP: 00007ffd4cc2a340 R08: 00007ffd4cc2a350 R09: 0000000000000001 [ 15.602751] R10: 00007f538128a990 R11: 0000000000000246 R12: 0000000000000000 [ 15.603882] R13: 00007ffd4cc2a350 R14: 00007ffd4cc2a4b0 R15: 0000000000000000 [ 15.605042] ---[ end trace 325cf185e2795048 ]--- Fixes: dd98d2895de6 ("ethtool: improve compat ioctl handling") Reported-by: Shannon Nelson CC: Arnd Bergmann CC: Christoph Hellwig Signed-off-by: Saeed Mahameed Tested-by: Shannon Nelson Acked-by: Arnd Bergmann Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ethtool/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -906,7 +906,7 @@ static int ethtool_rxnfc_copy_to_user(vo rule_buf); useraddr += offsetof(struct compat_ethtool_rxnfc, rule_locs); } else { - ret = copy_to_user(useraddr, &rxnfc, size); + ret = copy_to_user(useraddr, rxnfc, size); useraddr += offsetof(struct ethtool_rxnfc, rule_locs); }