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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 98787C433E6 for ; Mon, 1 Feb 2021 20:33:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D94264ECE for ; Mon, 1 Feb 2021 20:33:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232070AbhBAUdX (ORCPT ); Mon, 1 Feb 2021 15:33:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229680AbhBAUdT (ORCPT ); Mon, 1 Feb 2021 15:33:19 -0500 Received: from mail-lf1-x12a.google.com (mail-lf1-x12a.google.com [IPv6:2a00:1450:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F821C061573; Mon, 1 Feb 2021 12:32:39 -0800 (PST) Received: by mail-lf1-x12a.google.com with SMTP id f1so24681435lfu.3; Mon, 01 Feb 2021 12:32:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Mm+gqPPtT3ykIJnjiqZUK3SQ00bT+N0nYZsq8iy0pto=; b=RaPkDX1gPwnslbiiJ17EhK4oGFZW+7DAvlkpmVxv4/2ekpMzFg+l44JlbFhSJimi4K a6ZfeVPYoALr9Ahhd61n47BUNkne2fPX161E4ub1KCylUgREwh3TxmWaeOByzY+Dar+S bADm2s8w0eb79/ldgNES0LagfWgxA1upSZ+RcHr0NmP7WgWWu28GjgNT6LTXfSpBqq1g s757eWXXgfYE62ojzGATr2uVoQcF3dxQF4En/J1ArGLYuTjiH4PcfBSvhKShknwFODeK z2S1FW0DFPFs/3rSKTCafzk/AY1D4mSf/LuGYFIaj1u6C4Wa4kdtbgowdcxdfyS61XZs JQdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Mm+gqPPtT3ykIJnjiqZUK3SQ00bT+N0nYZsq8iy0pto=; b=J08zRBzSYtXdLr2SpyTFE6v76GKJvMKZLzw4H5nUtB9EDDWHDKLHIrWI1UJofX8BXO myOpVobf6Ebq2wsvA9bPwdh65MZ2zkWDDEObg+3snMWeR3n53yWjNnqLes8x+JlWnPoC tSRmsZ5Gc5yuidddHn8VZuTRrGJY08sjthcYM/gYdY5vYyy3abeA0gePTcROHJo09fhn fkAWybU8+N7QLizB8zPKk1k3LsCY840h2Q7Ju92PKWi1B3bN9b7c+ag2Ftz+wzVaVKy+ v/0BLiu1d2n42o6hz3YlmoEAyVKCETCg9C0lkc8+9jbNFf3yMGPhkqzr+CJK+tW39VDX evTg== X-Gm-Message-State: AOAM531u0d/ZstGFYC+7Rp4QD+agZpDv3D+JTIEekVYooY1L7ebIAidp xpQes959ftk7MIEZRiC6H9DxhlgksKGqiIQs X-Google-Smtp-Source: ABdhPJzglxpP8utAXB9egMWGzs+nYcPmfwE4HOvoD5SxSq1ynspf7hhnPKPUoPJR0quypq4e8qXdog== X-Received: by 2002:a05:6512:1181:: with SMTP id g1mr5796396lfr.351.1612211557539; Mon, 01 Feb 2021 12:32:37 -0800 (PST) Received: from localhost.localdomain ([37.151.209.186]) by smtp.googlemail.com with ESMTPSA id u17sm4055497ljj.2.2021.02.01.12.32.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Feb 2021 12:32:35 -0800 (PST) From: Sabyrzhan Tasbolatov To: santosh.shilimkar@oracle.com, davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com, linux-kernel@vger.kernel.org, syzbot+1bd2b07f93745fa38425@syzkaller.appspotmail.com Subject: [PATCH] net/rds: restrict iovecs length for RDS_CMSG_RDMA_ARGS Date: Tue, 2 Feb 2021 02:32:33 +0600 Message-Id: <20210201203233.1324704-1-snovitoll@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot found WARNING in rds_rdma_extra_size [1] when RDS_CMSG_RDMA_ARGS control message is passed with user-controlled 0x40001 bytes of args->nr_local, causing order >= MAX_ORDER condition. The exact value 0x40001 can be checked with UIO_MAXIOV which is 0x400. So for kcalloc() 0x400 iovecs with sizeof(struct rds_iovec) = 0x10 is the closest limit, with 0x10 leftover. Same condition is currently done in rds_cmsg_rdma_args(). [1] WARNING: mm/page_alloc.c:5011 [..] Call Trace: alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267 alloc_pages include/linux/gfp.h:547 [inline] kmalloc_order+0x2e/0xb0 mm/slab_common.c:837 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853 kmalloc_array include/linux/slab.h:592 [inline] kcalloc include/linux/slab.h:621 [inline] rds_rdma_extra_size+0xb2/0x3b0 net/rds/rdma.c:568 rds_rm_size net/rds/send.c:928 [inline] Reported-by: syzbot+1bd2b07f93745fa38425@syzkaller.appspotmail.com Signed-off-by: Sabyrzhan Tasbolatov --- net/rds/rdma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/rds/rdma.c b/net/rds/rdma.c index 1d0afb1dd77b..6f1a50d50d06 100644 --- a/net/rds/rdma.c +++ b/net/rds/rdma.c @@ -565,6 +565,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args, if (args->nr_local == 0) return -EINVAL; + if (args->nr_local > UIO_MAXIOV) + return -EMSGSIZE; + iov->iov = kcalloc(args->nr_local, sizeof(struct rds_iovec), GFP_KERNEL); -- 2.25.1