From patchwork Wed Dec 11 09:21:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guangguan Wang X-Patchwork-Id: 13903251 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-97.freemail.mail.aliyun.com (out30-97.freemail.mail.aliyun.com [115.124.30.97]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 744AD23368C; Wed, 11 Dec 2024 09:21:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.97 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733908900; cv=none; b=FeO64Pm14yZ1/akaYf42aRxHkjP73kzTVRrMOKZ4E8WMlgw6CSuPP3GMytXcEIJurDHmwSXFjTcvZ7RcGSVQ2xgivylqQ+SuhmRAhV/Jepaokx2zRPodCnFNSjWasD5XihjTc9lUB85fIjxK8TABqsodoRg1x2n/j9NOccqTleg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733908900; c=relaxed/simple; bh=vusTrhM8DAefiS223HMLa0+Fd8AmRhkhA5xGXNXXRh0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AQEObOK6yUTewT0uyMmNYkj2YAgxPt2z4QCmwfWE2tqUu4ClzBb6EaY/TvGR29kKwTyLLAfXy/Sx7WKPKG32SWbo1jC0sYvn8R6oXmkKNZCFQ9ueQej6DQAdj90qTlAAfPy58NQRSpwwGUK9bsz8hqnOUdfT4aBK4qekw2inKg4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=Gkbykv5Q; arc=none smtp.client-ip=115.124.30.97 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="Gkbykv5Q" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1733908895; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=oSj6m08arF0WtGw1YqlMHZqeKL2gyt5wpE7kA63B6RE=; b=Gkbykv5QhFlSM1XC8nXpJ2J3Lc4G3hHjwueJOkBOKy/ICmvJJ0NuvctBlrHxMzcgqlQ58Us7eaRVUseFyQ9ZC/btLclgAeLKaAD8IhLIUZkZDFxlL+QTDpvU8Idf19xRu52uYmnGKy4dfDvFxNVhJ+PevvRLKlKGSqfYxWkxQI8= Received: from localhost.localdomain(mailfrom:guangguan.wang@linux.alibaba.com fp:SMTPD_---0WLHtOox_1733908894 cluster:ay36) by smtp.aliyun-inc.com; Wed, 11 Dec 2024 17:21:34 +0800 From: Guangguan Wang To: wenjia@linux.ibm.com, jaka@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org Cc: linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net v2 5/6] net/smc: check smcd_v2_ext_offset when receiving proposal msg Date: Wed, 11 Dec 2024 17:21:20 +0800 Message-Id: <20241211092121.19412-6-guangguan.wang@linux.alibaba.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20241211092121.19412-1-guangguan.wang@linux.alibaba.com> References: <20241211092121.19412-1-guangguan.wang@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org When receiving proposal msg in server, the field smcd_v2_ext_offset in proposal msg is from the remote client and can not be fully trusted. Once the value of smcd_v2_ext_offset exceed the max value, there has the chance to access wrong address, and crash may happen. This patch checks the value of smcd_v2_ext_offset before using it. Fixes: 5c21c4ccafe8 ("net/smc: determine accepted ISM devices") Signed-off-by: Guangguan Wang Reviewed-by: Wen Gu Reviewed-by: D. Wythe --- net/smc/af_smc.c | 2 ++ net/smc/smc_clc.h | 8 +++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index a795acaa0780..a1dafb88f3c0 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2147,6 +2147,8 @@ static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc, pclc_smcd = smc_get_clc_msg_smcd(pclc); smc_v2_ext = smc_get_clc_v2_ext(pclc); smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext); + if (!pclc_smcd || !smc_v2_ext || !smcd_v2_ext) + goto not_found; mutex_lock(&smcd_dev_list.mutex); if (pclc_smcd->ism.chid) { diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h index 23afa4df862e..767289925410 100644 --- a/net/smc/smc_clc.h +++ b/net/smc/smc_clc.h @@ -400,9 +400,15 @@ smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop) static inline struct smc_clc_smcd_v2_extension * smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext) { + u16 max_offset = offsetof(struct smc_clc_msg_proposal_area, pclc_smcd_v2_ext) - + offsetof(struct smc_clc_msg_proposal_area, pclc_v2_ext) - + offsetof(struct smc_clc_v2_extension, hdr) - + offsetofend(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset); + if (!prop_v2ext) return NULL; - if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset)) + if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset) || + ntohs(prop_v2ext->hdr.smcd_v2_ext_offset) > max_offset) return NULL; return (struct smc_clc_smcd_v2_extension *)