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GET /api/1.2/patches/2223243/?format=api
{ "id": 2223243, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2223243/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260414191533.1467353-2-michael.bommarito@gmail.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.2/projects/12/?format=api", "name": "Linux CIFS Client", "link_name": "linux-cifs-client", "list_id": "linux-cifs.vger.kernel.org", "list_email": "linux-cifs@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260414191533.1467353-2-michael.bommarito@gmail.com>", "list_archive_url": null, "date": "2026-04-14T19:15:31", "name": "[1/3] ksmbd: cap response sizes in ipc_validate_msg()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c1d344feb6683b1de30441d9d24ae4e99f13b313", "submitter": { "id": 93078, "url": "http://patchwork.ozlabs.org/api/1.2/people/93078/?format=api", "name": "Michael Bommarito", "email": "michael.bommarito@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260414191533.1467353-2-michael.bommarito@gmail.com/mbox/", "series": [ { "id": 499887, "url": "http://patchwork.ozlabs.org/api/1.2/series/499887/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=499887", "date": "2026-04-14T19:15:31", "name": "ksmbd: harden IPC response arithmetic and ACE walk", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499887/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223243/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223243/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-10820-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-cifs@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=CnBwQcDu;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; helo=tor.lore.kernel.org;\n envelope-from=linux-cifs+bounces-10820-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"CnBwQcDu\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.219.47", "smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com" ], "Received": [ "from tor.lore.kernel.org (tor.lore.kernel.org\n [IPv6:2600:3c04:e001:36c::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fwDX42CgMz1y2d\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 15 Apr 2026 05:16:04 +1000 (AEST)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id 534C13046F2A\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 14 Apr 2026 19:15:59 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 89DA32D12F3;\n\tTue, 14 Apr 2026 19:15:56 +0000 (UTC)", "from mail-qv1-f47.google.com (mail-qv1-f47.google.com\n [209.85.219.47])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FE49282F25\n\tfor <linux-cifs@vger.kernel.org>; Tue, 14 Apr 2026 19:15:55 +0000 (UTC)", "by mail-qv1-f47.google.com with SMTP id\n 6a1803df08f44-8a3b0242631so68778066d6.3\n for <linux-cifs@vger.kernel.org>;\n Tue, 14 Apr 2026 12:15:55 -0700 (PDT)", "from server0 (c-68-48-65-54.hsd1.mi.comcast.net. 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Three cases can overflow:\n\n KSMBD_EVENT_RPC_REQUEST:\n msg_sz = sizeof(struct ksmbd_rpc_command) + resp->payload_sz;\n KSMBD_EVENT_SHARE_CONFIG_REQUEST:\n msg_sz = sizeof(struct ksmbd_share_config_response) +\n resp->payload_sz;\n KSMBD_EVENT_LOGIN_REQUEST_EXT:\n msg_sz = sizeof(struct ksmbd_login_response_ext) +\n resp->ngroups * sizeof(gid_t);\n\nresp->payload_sz is __u32 and resp->ngroups is __s32. Each addition\ncan wrap in unsigned int; the multiplication by sizeof(gid_t) mixes\nsigned and size_t, so a negative ngroups is converted to SIZE_MAX\nbefore the multiply. A wrapped value of msg_sz that happens to\nequal entry->msg_sz bypasses the size check on the next line, and\ndownstream consumers (smb2pdu.c:6742 memcpy using rpc_resp->payload_sz,\nkmemdup in ksmbd_alloc_user using resp_ext->ngroups) then trust the\nunverified length.\n\nThis is the response-side analogue of aab98e2dbd64 (\"ksmbd: fix\ninteger overflows on 32 bit systems\"), which hardened the request\nside by bounding attacker-controlled lengths against the existing\nKSMBD_IPC_MAX_PAYLOAD / NGROUPS_MAX caps. Apply the same caps on\nthe response side: reject resp->payload_sz > KSMBD_IPC_MAX_PAYLOAD\nfor RPC_REQUEST and SHARE_CONFIG_REQUEST, and reject resp->ngroups\noutside the signed [0, NGROUPS_MAX] range for LOGIN_REQUEST_EXT.\nWith those caps the subsequent additions and multiplication are\nbounded well below UINT_MAX.\n\nFixes: 0626e6641f6b (\"cifsd: add server handler for central processing and tranport layers\")\nCc: stable@vger.kernel.org\nAssisted-by: Claude:claude-opus-4-6\nAssisted-by: Codex:gpt-5-4\nSigned-off-by: Michael Bommarito <michael.bommarito@gmail.com>\n---\n fs/smb/server/transport_ipc.c | 7 ++++++-\n 1 file changed, 6 insertions(+), 1 deletion(-)\n\n--\n2.53.0", "diff": "diff --git a/fs/smb/server/transport_ipc.c b/fs/smb/server/transport_ipc.c\n--- a/fs/smb/server/transport_ipc.c\n+++ b/fs/smb/server/transport_ipc.c\n@@ -497,6 +497,8 @@ static int ipc_validate_msg(struct ipc_msg_table_entry *entry)\n \t{\n \t\tstruct ksmbd_rpc_command *resp = entry->response;\n\n+\t\tif (resp->payload_sz > KSMBD_IPC_MAX_PAYLOAD)\n+\t\t\treturn -EINVAL;\n \t\tmsg_sz = sizeof(struct ksmbd_rpc_command) + resp->payload_sz;\n \t\tbreak;\n \t}\n@@ -513,7 +515,8 @@ static int ipc_validate_msg(struct ipc_msg_table_entry *entry)\n \t\tstruct ksmbd_share_config_response *resp = entry->response;\n\n \t\tif (resp->payload_sz) {\n-\t\t\tif (resp->payload_sz < resp->veto_list_sz)\n+\t\t\tif (resp->payload_sz < resp->veto_list_sz ||\n+\t\t\t resp->payload_sz > KSMBD_IPC_MAX_PAYLOAD)\n \t\t\t\treturn -EINVAL;\n\n \t\t\tmsg_sz = sizeof(struct ksmbd_share_config_response) +\n@@ -526,6 +529,8 @@ static int ipc_validate_msg(struct ipc_msg_table_entry *entry)\n \t\tstruct ksmbd_login_response_ext *resp = entry->response;\n\n \t\tif (resp->ngroups) {\n+\t\t\tif (resp->ngroups < 0 || resp->ngroups > NGROUPS_MAX)\n+\t\t\t\treturn -EINVAL;\n \t\t\tmsg_sz = sizeof(struct ksmbd_login_response_ext) +\n \t\t\t\t\tresp->ngroups * sizeof(gid_t);\n \t\t}\n", "prefixes": [ "1/3" ] }