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GET /api/patches/2224703/?format=api
{ "id": 2224703, "url": "http://patchwork.ozlabs.org/api/patches/2224703/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260417193317.315698-1-tristan@talencesecurity.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/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": "<20260417193317.315698-1-tristan@talencesecurity.com>", "list_archive_url": null, "date": "2026-04-17T19:33:17", "name": "[v2] ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "62bcdf4a5c9a4e287de0100d527313a75170b11b", "submitter": { "id": 93179, "url": "http://patchwork.ozlabs.org/api/people/93179/?format=api", "name": "Tristan Madani", "email": "tristmd@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260417193317.315698-1-tristan@talencesecurity.com/mbox/", "series": [ { "id": 500395, "url": "http://patchwork.ozlabs.org/api/series/500395/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=500395", "date": "2026-04-17T19:33:17", "name": "[v2] ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500395/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224703/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224703/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-10895-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=Zfwpzdvd;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-10895-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=\"Zfwpzdvd\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.221.47", "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 sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::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 4fy4mx5Lb0z1yCv\n\tfor <incoming@patchwork.ozlabs.org>; Sat, 18 Apr 2026 05:33:37 +1000 (AEST)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id B145A3011C65\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 17 Apr 2026 19:33:26 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 0E40832E126;\n\tFri, 17 Apr 2026 19:33:25 +0000 (UTC)", "from mail-wr1-f47.google.com (mail-wr1-f47.google.com\n [209.85.221.47])\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 B1DFF389470\n\tfor <linux-cifs@vger.kernel.org>; Fri, 17 Apr 2026 19:33:21 +0000 (UTC)", "by mail-wr1-f47.google.com with SMTP id\n ffacd0b85a97d-43cfd1f9fd1so660512f8f.3\n for <linux-cifs@vger.kernel.org>;\n Fri, 17 Apr 2026 12:33:20 -0700 (PDT)", "from debian.. 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The bounds check on buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check on remaining space.\n\nWhen the EA value exactly fills the remaining buffer (buf_free_len == 0\nafter value subtraction), the alignment memset writes 1-3 NUL bytes\npast the buf_free_len boundary. In compound requests where the response\nbuffer is shared across commands, the first command (e.g., READ) can\nconsume most of the buffer, leaving a tight remainder for the QUERY_INFO\nEA response. The alignment memset then overwrites past the physical\nkvmalloc allocation into adjacent kernel heap memory.\n\nAdd a bounds check before the alignment memset to ensure buf_free_len\ncan accommodate the padding bytes.\n\nThis is the same bug pattern fixed by commit beef2634f81f (\"ksmbd: fix\npotencial OOB in get_file_all_info() for compound requests\") and\ncommit fda9522ed6af (\"ksmbd: fix OOB write in QUERY_INFO for compound\nrequests\"), both of which added bounds checks before unconditional\nwrites in QUERY_INFO response handlers.\n\nCc: stable@vger.kernel.org\nFixes: e2b76ab8b5c9 (\"ksmbd: add support for read compound\")\nSigned-off-by: Tristan Madani <tristan@talencesecurity.com>\n---\n fs/smb/server/smb2pdu.c | 2 ++\n 1 file changed, 2 insertions(+)", "diff": "diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c\nindex ee32e61b6d3c7..407173d2175af 100644\n--- a/fs/smb/server/smb2pdu.c\n+++ b/fs/smb/server/smb2pdu.c\n@@ -4821,6 +4821,8 @@ static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp,\n \t\t/* align next xattr entry at 4 byte bundary */\n \t\talignment_bytes = ((next_offset + 3) & ~3) - next_offset;\n \t\tif (alignment_bytes) {\n+\t\t\tif (buf_free_len < alignment_bytes)\n+\t\t\t\tbreak;\n \t\t\tmemset(ptr, '\\0', alignment_bytes);\n \t\t\tptr += alignment_bytes;\n \t\t\tnext_offset += alignment_bytes;\n", "prefixes": [ "v2" ] }