From patchwork Wed May 4 01:44:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12836897 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 920BEC43217 for ; Wed, 4 May 2022 01:53:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343739AbiEDB4t (ORCPT ); Tue, 3 May 2022 21:56:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343730AbiEDBy5 (ORCPT ); Tue, 3 May 2022 21:54:57 -0400 Received: from mail-pg1-f182.google.com (mail-pg1-f182.google.com [209.85.215.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78CCE419B3 for ; Tue, 3 May 2022 18:49:07 -0700 (PDT) Received: by mail-pg1-f182.google.com with SMTP id 6so3748502pgb.13 for ; Tue, 03 May 2022 18:49:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=dWvrJlxp0hfwq/rpuMGCsTJMwzo7GNCIoJATWYPCVJE=; b=OW0yn3aPFgkfwn8L35EyIBf488Ir3oPRdcuBBy8HPNsH5M0x5CXqSqshhOTKtpKq5L QF/xhc9eykoWhvFmZW6nwgo8tyY5Hha7nsaQ+7vI7aAIrUuE+pM/MYF4FAAKrs9ERjRM nEcriHnnehj4N7XQ40GlCVy2op0vzdnIn84H4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dWvrJlxp0hfwq/rpuMGCsTJMwzo7GNCIoJATWYPCVJE=; b=cb1FfkgoE2CYInYnMgSOtDOgjpo9Mrk/fk9dyEXRqiu2TZb26NCvFP9Esy+IGVr/Rn lKV1TCFcxl7g2cQASvcpKqFvE6v0Nwo/oShknmP04yGU+4A+lsOpW3mSTxwqpJKxnaAO /d/2vi2KPSg/GFutXmCGx4Tj8fAEZgQl6sm5MPz0szbSFSKrLVfBJzdwIPUoUjyu3xFA w9rwPiCD2Fm2N33r39gvFyueK8S8w22CxLM6uuyCuxG7L4HeIcMFPuODFZzslLol7Dko fNfsQ1IqE43Q8uzcS078AJX5kIsgjKyTZCaW3bKwi9MlIX1MXj84yHWV286MDjyOtKmf LJ4g== X-Gm-Message-State: AOAM533UT8aa48Fg/2X35JKfls0x1GagKruGfWIbWaTiIKkMQ5Fw0ajf sUoFQzmg4rnX3Qwu8ms/lm78+3D3xw0zMA== X-Google-Smtp-Source: ABdhPJzOaa5v3jlqumCDj5Itb35H5nm0wuuZNJDbIPaJqouQiWes+awOwCXnf4apYBS42dQvscreqA== X-Received: by 2002:a65:6216:0:b0:39d:5e6c:7578 with SMTP id d22-20020a656216000000b0039d5e6c7578mr15924526pgv.114.1651628868778; Tue, 03 May 2022 18:47:48 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id s5-20020a17090aa10500b001d287fd3f79sm1950057pjp.46.2022.05.03.18.47.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:47:47 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , linux-hyperv@vger.kernel.org, Alexei Starovoitov , alsa-devel@alsa-project.org, Al Viro , Andrew Gabbasov , Andrew Morton , Andy Gross , Andy Lavr , Arend van Spriel , Baowen Zheng , Bjorn Andersson , Boris Ostrovsky , Bradley Grove , brcm80211-dev-list.pdl@broadcom.com, Christian Brauner , =?utf-8?q?Christian_G=C3=B6ttsche?= , Christian Lamparter , Chris Zankel , Cong Wang , Daniel Axtens , Daniel Vetter , Dan Williams , David Gow , David Howells , "David S. Miller" , Dennis Dalessandro , devicetree@vger.kernel.org, Dmitry Kasatkin , Eli Cohen , Eric Dumazet , Eric Paris , Eugeniu Rosca , Felipe Balbi , Francis Laniel , Frank Rowand , Franky Lin , Greg Kroah-Hartman , Gregory Greenman , Guenter Roeck , Hante Meuleman , Herbert Xu , Hulk Robot , Jakub Kicinski , "James E.J. Bottomley" , James Morris , Jarkko Sakkinen , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Johan Hedberg , Johannes Berg , Johannes Berg , John Keeping , Juergen Gross , Kalle Valo , Keith Packard , keyrings@vger.kernel.org, kunit-dev@googlegroups.com, Kuniyuki Iwashima , Lars-Peter Clausen , Lee Jones , Leon Romanovsky , Liam Girdwood , linux1394-devel@lists.sourceforge.net, linux-afs@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-hardening@vger.kernel.org, linux-integrity@vger.kernel.org, linux-rdma@vger.kernel.org, linux-scsi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, linux-xtensa@linux-xtensa.org, llvm@lists.linux.dev, Loic Poulain , Louis Peens , Luca Coelho , Luiz Augusto von Dentz , Marc Dionne , Marcel Holtmann , Mark Brown , "Martin K. Petersen" , Max Filippov , Mimi Zohar , Muchun Song , Nathan Chancellor , netdev@vger.kernel.org, Nick Desaulniers , =?utf-8?q?Nuno_S=C3=A1?= , Paolo Abeni , Paul Moore , Rich Felker , Rob Herring , Russell King , selinux@vger.kernel.org, "Serge E. Hallyn" , SHA-cyfmac-dev-list@infineon.com, Simon Horman , Stefano Stabellini , Stefan Richter , Steffen Klassert , Stephen Smalley , Tadeusz Struk , Takashi Iwai , Tom Rix , Udipto Goswami , Vincenzo Frascino , wcn36xx@lists.infradead.org, xen-devel@lists.xenproject.org, Xiu Jianfeng , Yang Yingliang Subject: [PATCH 25/32] Drivers: hv: utils: Use mem_to_flex_dup() with struct cn_msg Date: Tue, 3 May 2022 18:44:34 -0700 Message-Id: <20220504014440.3697851-26-keescook@chromium.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220504014440.3697851-1-keescook@chromium.org> References: <20220504014440.3697851-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2219; h=from:subject; bh=dgFYdMqTm4tBMA+d8KWXYde/YMvArhgtiTydpKgqF6s=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqGpwfENVCD78xIrOKs07wFk+8+2VNIIqaIzTy/ MQg5zx6JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHahgAKCRCJcvTf3G3AJlkID/ 9xYgI2yUTmOqWGUHwjPg6PRpPwUj6yqPTnvHBjZmeB6GcMkb/J1qYZ0We4QMX2FKo8/RxUIZmkpsBI ghlT5pXLwU+EL9vLRAtiKFcmM6HmLrpDOA+H7c/+3yz3nLeExs5il9FvDhAWsAneG2E6lymkjrtZwB PmGHZ1SbLjt7dlHn9zzeTTcBLGvqVG+t1HbL1yM0qT9sxR33bwrS1/XY/VbQ9ZBwXv5G1ci/UQYTn+ IxWJQyTz1WY3n4gGJIy12AX3Gg0SC3bdx9m5pnqgXmSvY3uw+gAkf+Jq+ITd7t+YW8zrXaiMMGPmhC +dn4j7Pvv4hNJ6R/d9/lrj8cAs53cQUbwW3e/7yRsiZb37BKs643K8RW97bKNemjiBUk2NngqjWaOl FzxBm7iGLEjOq989XZeJNEB+MQLecqtGjX+/LxzzzpvAKeMi9bXDiSJAfPG2yxB7wzIUCmUUxW3kKq 5ITIvocBuuqbJzokzh+M+VX/4LsefOVBxhkljlxxgFvwnLhsXHSrMa9c7vd07TAikSiJ0Vi6xYDuv0 m4TiF4oEz1DuG0oiUI9BpM7VSTL+S8V/5GoKv/V+vcO7lhrDKhfS7G8kPKHplhyqNqe7RD2pCIVyOI ++T7/zqpV+vaRd4iu+z+vgmLDrCZcODKGwvjXW2ZeAEW8baladN7FbwkDLDA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org As part of the work to perform bounds checking on all memcpy() uses, replace the open-coded a deserialization of bytes out of memory into a trailing flexible array by using a flex_array.h helper to perform the allocation, bounds checking, and copying. Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Wei Liu Cc: Dexuan Cui Cc: linux-hyperv@vger.kernel.org Signed-off-by: Kees Cook --- drivers/hv/hv_utils_transport.c | 7 ++----- include/uapi/linux/connector.h | 4 ++-- 2 files changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/hv/hv_utils_transport.c b/drivers/hv/hv_utils_transport.c index 832885198643..43b4f8893cc0 100644 --- a/drivers/hv/hv_utils_transport.c +++ b/drivers/hv/hv_utils_transport.c @@ -217,20 +217,17 @@ static void hvt_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len, void (*on_read_cb)(void)) { - struct cn_msg *cn_msg; + struct cn_msg *cn_msg = NULL; int ret = 0; if (hvt->mode == HVUTIL_TRANSPORT_INIT || hvt->mode == HVUTIL_TRANSPORT_DESTROY) { return -EINVAL; } else if (hvt->mode == HVUTIL_TRANSPORT_NETLINK) { - cn_msg = kzalloc(sizeof(*cn_msg) + len, GFP_ATOMIC); - if (!cn_msg) + if (mem_to_flex_dup(&cn_msg, msg, len, GFP_ATOMIC)) return -ENOMEM; cn_msg->id.idx = hvt->cn_id.idx; cn_msg->id.val = hvt->cn_id.val; - cn_msg->len = len; - memcpy(cn_msg->data, msg, len); ret = cn_netlink_send(cn_msg, 0, 0, GFP_ATOMIC); kfree(cn_msg); /* diff --git a/include/uapi/linux/connector.h b/include/uapi/linux/connector.h index 3738936149a2..b85bbe753dae 100644 --- a/include/uapi/linux/connector.h +++ b/include/uapi/linux/connector.h @@ -73,9 +73,9 @@ struct cn_msg { __u32 seq; __u32 ack; - __u16 len; /* Length of the following data */ + __DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(__u16, len); __u16 flags; - __u8 data[0]; + __DECLARE_FLEX_ARRAY_ELEMENTS(__u8, data); }; #endif /* _UAPI__CONNECTOR_H */