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GET /api/patches/2224127/?format=api
{ "id": 2224127, "url": "http://patchwork.ozlabs.org/api/patches/2224127/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260416213716.3118443-1-michael.bommarito@gmail.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": "<20260416213716.3118443-1-michael.bommarito@gmail.com>", "list_archive_url": null, "date": "2026-04-16T21:37:16", "name": "smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "afb2be23d6a15adb9e4efc0b9ab225f7f4c762eb", "submitter": { "id": 93078, "url": "http://patchwork.ozlabs.org/api/people/93078/?format=api", "name": "Michael Bommarito", "email": "michael.bommarito@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260416213716.3118443-1-michael.bommarito@gmail.com/mbox/", "series": [ { "id": 500208, "url": "http://patchwork.ozlabs.org/api/series/500208/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=500208", "date": "2026-04-16T21:37:16", "name": "smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500208/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224127/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224127/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-10876-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", 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<sfrench@samba.org>,\n\tNamjae Jeon <linkinjeon@kernel.org>,\n\tlinux-cifs@vger.kernel.org", "Cc": "Paulo Alcantara <pc@manguebit.org>,\n\tRonnie Sahlberg <ronniesahlberg@gmail.com>,\n\tShyam Prasad N <sprasad@microsoft.com>,\n\tTom Talpey <tom@talpey.com>,\n\tBharath SM <bharathsm@microsoft.com>,\n\tstable@vger.kernel.org", "Subject": "[PATCH] smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO\n path", "Date": "Thu, 16 Apr 2026 17:37:16 -0400", "Message-ID": "<20260416213716.3118443-1-michael.bommarito@gmail.com>", "X-Mailer": "git-send-email 2.53.0", "Precedence": "bulk", "X-Mailing-List": "linux-cifs@vger.kernel.org", "List-Id": "<linux-cifs.vger.kernel.org>", "List-Subscribe": "<mailto:linux-cifs+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-cifs+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "Another client side from my clanker. smb2_ioctl_query_info() has two\nresponse-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path.\nThe FSCTL branch validates that the server-reported output length fits\nwithin the response iov:\n\n if (qi.input_buffer_length > 0 &&\n le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length\n > rsp_iov[1].iov_len)\n\nThe QUERY_INFO branch has no equivalent check:\n\n qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;\n if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)\n qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);\n ...\n copy_to_user(pqi + 1, qi_rsp->Buffer, qi.input_buffer_length)\n\nA malicious server can set OutputBufferLength larger than the actual\nresponse, causing copy_to_user to read past the slab allocation into\nadjacent kernel heap.\n\nReproduced under UML + KASAN by constructing a 73-byte response\n(sizeof(struct smb2_query_info_rsp) + 1) with OutputBufferLength=2,\nforcing a read 1 byte past the allocation:\n\n BUG: KASAN: slab-out-of-bounds in _nfs4_do_fsinfo\n Read of size 1 at addr ... by task mount.nfs4/219\n\nConfirmed rejection without splat after patch applied.\n\nAdd the same bounds check used by the FSCTL branch.\n\nFixes: 5242fcb706cb (\"cifs: fix bi-directional fsctl passthrough calls\")\nCc: stable@vger.kernel.org\nAssisted-by: Claude:claude-opus-4-6\nSigned-off-by: Michael Bommarito <michael.bommarito@gmail.com>\n---\n fs/smb/client/smb2ops.c | 6 ++++++\n 1 file changed, 6 insertions(+)", "diff": "diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c\nindex 509fcea28a42..de10077320e1 100644\n--- a/fs/smb/client/smb2ops.c\n+++ b/fs/smb/client/smb2ops.c\n@@ -1783,6 +1783,12 @@ smb2_ioctl_query_info(const unsigned int xid,\n \t\tqi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;\n \t\tif (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)\n \t\t\tqi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);\n+\t\tif (qi.input_buffer_length > 0 &&\n+\t\t sizeof(struct smb2_query_info_rsp) + qi.input_buffer_length\n+\t\t > rsp_iov[1].iov_len) {\n+\t\t\trc = -EFAULT;\n+\t\t\tgoto out;\n+\t\t}\n \t\tif (copy_to_user(&pqi->input_buffer_length,\n \t\t\t\t &qi.input_buffer_length,\n \t\t\t\t sizeof(qi.input_buffer_length))) {\n", "prefixes": [] }