From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 50710174CA for ; Wed, 9 Aug 2023 10:57:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6028C433C8; Wed, 9 Aug 2023 10:57:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691578675; bh=P3EFJPDAqXKsC5iQvWc+AQwsXYAjrUMGybJsKT1HB64=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lzWA6OcfPc9gcQFrjJZue4huWGirszu5zWMVjKxvRuADsF3iOPT65HcUc3bqicDPt YuaUKvTMKXlnPA0jWm7gSuCPTlmYNfSif9QxAreReYu+S7JpkGNy91y/3IfsJCfmXH wqDwU2Aagpw8XSfDmhNROP7dW4DJ60xOWW4SlnSc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jakub Kicinski , Lin Ma , Martin KaFai Lau , Sasha Levin Subject: [PATCH 5.15 17/92] bpf: Add length check for SK_DIAG_BPF_STORAGE_REQ_MAP_FD parsing Date: Wed, 9 Aug 2023 12:40:53 +0200 Message-ID: <20230809103634.194040442@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103633.485906560@linuxfoundation.org> References: <20230809103633.485906560@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Lin Ma [ Upstream commit bcc29b7f5af6797702c2306a7aacb831fc5ce9cb ] The nla_for_each_nested parsing in function bpf_sk_storage_diag_alloc does not check the length of the nested attribute. This can lead to an out-of-attribute read and allow a malformed nlattr (e.g., length 0) to be viewed as a 4 byte integer. This patch adds an additional check when the nlattr is getting counted. This makes sure the latter nla_get_u32 can access the attributes with the correct length. Fixes: 1ed4d92458a9 ("bpf: INET_DIAG support in bpf_sk_storage") Suggested-by: Jakub Kicinski Signed-off-by: Lin Ma Reviewed-by: Jakub Kicinski Link: https://lore.kernel.org/r/20230725023330.422856-1-linma@zju.edu.cn Signed-off-by: Martin KaFai Lau Signed-off-by: Sasha Levin --- net/core/bpf_sk_storage.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c index 910ca41cb9e67..4953abee79fea 100644 --- a/net/core/bpf_sk_storage.c +++ b/net/core/bpf_sk_storage.c @@ -521,8 +521,11 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs) return ERR_PTR(-EPERM); nla_for_each_nested(nla, nla_stgs, rem) { - if (nla_type(nla) == SK_DIAG_BPF_STORAGE_REQ_MAP_FD) + if (nla_type(nla) == SK_DIAG_BPF_STORAGE_REQ_MAP_FD) { + if (nla_len(nla) != sizeof(u32)) + return ERR_PTR(-EINVAL); nr_maps++; + } } diag = kzalloc(struct_size(diag, maps, nr_maps), GFP_KERNEL); -- 2.40.1