From patchwork Sun Sep 19 02:13:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Namjae Jeon X-Patchwork-Id: 12504119 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=-14.2 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 C6053C433EF for ; Sun, 19 Sep 2021 02:13:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A912260249 for ; Sun, 19 Sep 2021 02:13:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232440AbhISCPG (ORCPT ); Sat, 18 Sep 2021 22:15:06 -0400 Received: from mail-pl1-f171.google.com ([209.85.214.171]:39739 "EHLO mail-pl1-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229460AbhISCPF (ORCPT ); Sat, 18 Sep 2021 22:15:05 -0400 Received: by mail-pl1-f171.google.com with SMTP id c4so8764186pls.6 for ; Sat, 18 Sep 2021 19:13:41 -0700 (PDT) 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=/bM0yGOH/VtWb3S09A8hvDcI91tNnyxvI43zdKXZRQI=; b=4Y8mOVmrOAczBmInqJUwG8xfILmwQpibXYMd3Ilw69GRoY0Kpapfn3RkHUs4Z7dHv1 8/QcVprd/nggVkB+SFeLRH0jsKNKPS6Vur3SHEPKiqI2DHceL+hedTFXKK+dhNwUGiJK 3VBdHBhKVOeNT8yluxLBlcvaLOLiOc7O/wL9eiyzn3XvM//rKIUtpq0InvM6rpECkOzu UeBM2krbUPVQWgoQdHKssCddcUPIFS0ASrQm7qZTAVhdtKMc0iENs8seLWKwqLjYv1rc NhpuPc+nkv5vuX3JBKkPQONYFqMT08UsoaxTSBOLLss9DK/rHMtIMuLeP+URTQJjxsis ckVg== X-Gm-Message-State: AOAM532yIGPw1PSc9hClbdDiPd2Yss3l/Y1jTsWchTdbKXO0XTTsrYYk YYTFvSFdkOpkEvBgTHuA9oFKH/670ahcFg== X-Google-Smtp-Source: ABdhPJwqBfo9YvoV+m+EkEDhKyLdSVKbHhf7KChaefKk0Nc5KrtQaRF4AiilNHluGp3Ih0E6z8YjoA== X-Received: by 2002:a17:90b:4d05:: with SMTP id mw5mr8692950pjb.175.1632017621177; Sat, 18 Sep 2021 19:13:41 -0700 (PDT) Received: from localhost.localdomain ([61.74.27.164]) by smtp.gmail.com with ESMTPSA id m28sm10849537pgl.9.2021.09.18.19.13.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Sep 2021 19:13:40 -0700 (PDT) From: Namjae Jeon To: linux-cifs@vger.kernel.org Cc: Hyunchul Lee , Ronnie Sahlberg , =?utf-8?q?Ralph_B=C3=B6hme?= , Steve French , Namjae Jeon Subject: [PATCH v2 4/4] ksmbd: add buffer validation for SMB2_CREATE_CONTEXT Date: Sun, 19 Sep 2021 11:13:15 +0900 Message-Id: <20210919021315.642856-5-linkinjeon@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210919021315.642856-1-linkinjeon@kernel.org> References: <20210919021315.642856-1-linkinjeon@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org From: Hyunchul Lee Add buffer validation for SMB2_CREATE_CONTEXT. Cc: Ronnie Sahlberg Cc: Ralph Böhme Cc: Steve French Signed-off-by: Hyunchul Lee Signed-off-by: Namjae Jeon --- fs/ksmbd/oplock.c | 35 +++++++++++++++++++++++++---------- fs/ksmbd/smb2pdu.c | 25 ++++++++++++++++++++++++- fs/ksmbd/smbacl.c | 9 ++++++++- 3 files changed, 57 insertions(+), 12 deletions(-) diff --git a/fs/ksmbd/oplock.c b/fs/ksmbd/oplock.c index 16b6236d1bd2..3fd2713f2282 100644 --- a/fs/ksmbd/oplock.c +++ b/fs/ksmbd/oplock.c @@ -1451,26 +1451,41 @@ struct lease_ctx_info *parse_lease_state(void *open_req) */ struct create_context *smb2_find_context_vals(void *open_req, const char *tag) { - char *data_offset; + struct smb2_create_req *req = (struct smb2_create_req *)open_req; struct create_context *cc; - unsigned int next = 0; + char *data_offset, *data_end; char *name; - struct smb2_create_req *req = (struct smb2_create_req *)open_req; + unsigned int next = 0; + unsigned int name_off, name_len, value_off, value_len; data_offset = (char *)req + 4 + le32_to_cpu(req->CreateContextsOffset); + data_end = data_offset + le32_to_cpu(req->CreateContextsLength); cc = (struct create_context *)data_offset; do { - int val; - cc = (struct create_context *)((char *)cc + next); - name = le16_to_cpu(cc->NameOffset) + (char *)cc; - val = le16_to_cpu(cc->NameLength); - if (val < 4) + if ((char *)cc + offsetof(struct create_context, Buffer) > + data_end) return ERR_PTR(-EINVAL); - if (memcmp(name, tag, val) == 0) - return cc; next = le32_to_cpu(cc->Next); + name_off = le16_to_cpu(cc->NameOffset); + name_len = le16_to_cpu(cc->NameLength); + value_off = le16_to_cpu(cc->DataOffset); + value_len = le32_to_cpu(cc->DataLength); + + if ((char *)cc + name_off + name_len > data_end || + (value_len && (char *)cc + value_off + value_len > data_end)) + return ERR_PTR(-EINVAL); + else if (next && (next < name_off + name_len || + (value_len && next < value_off + value_len))) + return ERR_PTR(-EINVAL); + + name = (char *)cc + name_off; + if (name_len < 4) + return ERR_PTR(-EINVAL); + + if (memcmp(name, tag, name_len) == 0) + return cc; } while (next != 0); return NULL; diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 117cf242d9b8..6d57827320e3 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -2393,6 +2393,10 @@ static int smb2_create_sd_buffer(struct ksmbd_work *work, ksmbd_debug(SMB, "Set ACLs using SMB2_CREATE_SD_BUFFER context\n"); sd_buf = (struct create_sd_buf_req *)context; + if (le16_to_cpu(context->DataOffset) + + le32_to_cpu(context->DataLength) < + sizeof(struct create_sd_buf_req)) + return -EINVAL; return set_info_sec(work->conn, work->tcon, path, &sd_buf->ntsd, le32_to_cpu(sd_buf->ccontext.DataLength), true); } @@ -2593,6 +2597,12 @@ int smb2_open(struct ksmbd_work *work) goto err_out1; } else if (context) { ea_buf = (struct create_ea_buf_req *)context; + if (le16_to_cpu(context->DataOffset) + + le32_to_cpu(context->DataLength) < + sizeof(struct create_ea_buf_req)) { + rc = -EINVAL; + goto err_out1; + } if (req->CreateOptions & FILE_NO_EA_KNOWLEDGE_LE) { rsp->hdr.Status = STATUS_ACCESS_DENIED; rc = -EACCES; @@ -2631,6 +2641,12 @@ int smb2_open(struct ksmbd_work *work) } else if (context) { struct create_posix *posix = (struct create_posix *)context; + if (le16_to_cpu(context->DataOffset) + + le32_to_cpu(context->DataLength) < + sizeof(struct create_posix)) { + rc = -EINVAL; + goto err_out1; + } ksmbd_debug(SMB, "get posix context\n"); posix_mode = le32_to_cpu(posix->Mode); @@ -3037,9 +3053,16 @@ int smb2_open(struct ksmbd_work *work) rc = PTR_ERR(az_req); goto err_out; } else if (az_req) { - loff_t alloc_size = le64_to_cpu(az_req->AllocationSize); + loff_t alloc_size; int err; + if (le16_to_cpu(az_req->ccontext.DataOffset) + + le32_to_cpu(az_req->ccontext.DataLength) < + sizeof(struct create_alloc_size_req)) { + rc = -EINVAL; + goto err_out; + } + alloc_size = le64_to_cpu(az_req->AllocationSize); ksmbd_debug(SMB, "request smb2 create allocate size : %llu\n", alloc_size); diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c index 0a95cdec8c80..f67567e1e178 100644 --- a/fs/ksmbd/smbacl.c +++ b/fs/ksmbd/smbacl.c @@ -392,7 +392,7 @@ static void parse_dacl(struct user_namespace *user_ns, return; /* validate that we do not go past end of acl */ - if (end_of_acl <= (char *)pdacl || + if (end_of_acl < (char *)pdacl + sizeof(struct smb_acl) || end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) { pr_err("ACL too small to parse DACL\n"); return; @@ -434,6 +434,10 @@ static void parse_dacl(struct user_namespace *user_ns, ppace[i] = (struct smb_ace *)(acl_base + acl_size); acl_base = (char *)ppace[i]; acl_size = le16_to_cpu(ppace[i]->size); + + if (acl_base + acl_size > end_of_acl) + break; + ppace[i]->access_req = smb_map_generic_desired_access(ppace[i]->access_req); @@ -807,6 +811,9 @@ int parse_sec_desc(struct user_namespace *user_ns, struct smb_ntsd *pntsd, if (!pntsd) return -EIO; + if (acl_len < sizeof(struct smb_ntsd)) + return -EINVAL; + owner_sid_ptr = (struct smb_sid *)((char *)pntsd + le32_to_cpu(pntsd->osidoffset)); group_sid_ptr = (struct smb_sid *)((char *)pntsd +