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{ "id": 2227282, "url": "http://patchwork.ozlabs.org/api/covers/2227282/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/cover/CAC-THR-m=VEy9N=xc_gBSySxESamwsLNWy4tBuuCXxZQ7qJfMw@mail.gmail.com/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<CAC-THR-m=VEy9N=xc_gBSySxESamwsLNWy4tBuuCXxZQ7qJfMw@mail.gmail.com>", "list_archive_url": null, "date": "2026-04-23T11:29:52", "name": "[0/1] netfilter: nfnetlink_queue: fix missing padding in NFQA_PAYLOAD attribute", "submitter": { "id": 93237, "url": "http://patchwork.ozlabs.org/api/people/93237/?format=api", "name": "Ramesh Adhikari", "email": "adhikari.resume@gmail.com" }, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/cover/CAC-THR-m=VEy9N=xc_gBSySxESamwsLNWy4tBuuCXxZQ7qJfMw@mail.gmail.com/mbox/", "series": [ { "id": 501184, "url": "http://patchwork.ozlabs.org/api/series/501184/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501184", "date": "2026-04-23T11:29:52", "name": "netfilter: nfnetlink_queue: fix missing padding in NFQA_PAYLOAD attribute", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501184/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2227282/comments/", "headers": { "Return-Path": "\n <netfilter-devel+bounces-12154-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@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=N2lC3Pfo;\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; 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Thu, 23 Apr 2026\n 04:30:04 -0700 (PDT)", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "From": "Ramesh Adhikari <adhikari.resume@gmail.com>", "Date": "Thu, 23 Apr 2026 16:59:52 +0530", "X-Gm-Features": "AQROBzBgelQotVXV1c8ciDn0tPpiuCL74qxlCARfkOd-_4vqr4e8nowfr2krRa0", "Message-ID": "\n <CAC-THR-m=VEy9N=xc_gBSySxESamwsLNWy4tBuuCXxZQ7qJfMw@mail.gmail.com>", "Subject": "[PATCH 0/1] netfilter: nfnetlink_queue: fix missing padding in\n NFQA_PAYLOAD attribute", "To": "netfilter-devel@vger.kernel.org", "Cc": "pablo@netfilter.org", "Content-Type": "text/plain; charset=\"UTF-8\"" }, "content": "Hi Netfilter developers,\n\nI found a netlink attribute construction bug in nfnetlink_queue similar\nto the one recently fixed in nfnetlink_log (commit 52025ebaa29).\n\nISSUE:\nIn net/netfilter/nfnetlink_queue.c lines 894-899, the NFQA_PAYLOAD\nattribute is manually constructed without allocating padding bytes:\n\n nla = skb_put(skb, sizeof(*nla));\n nla->nla_type = NFQA_PAYLOAD;\n nla->nla_len = nla_attr_size(data_len);\n if (skb_zerocopy(skb, entskb, data_len, hlen))\n goto nla_put_failure;\n\nThis allocates only (4 + data_len) bytes. For data_len=5, this is 9 bytes.\n\nHowever, nla_next() expects padding:\n totlen = NLA_ALIGN(nla->nla_len); // NLA_ALIGN(9) = 12\n\nThe netlink message is 3 bytes short of what the parser expects.\n\nPROOF:\nWith copy_range=5, captured netlink messages are 73 bytes (should be 76).\nThe message ends immediately after the 5th data byte with no padding.\n\nFIX:\nReplace manual construction with __nla_reserve(), like all other\nattributes in the file:\n\n nla = __nla_reserve(skb, NFQA_PAYLOAD, data_len);\n if (!nla)\n goto nla_put_failure;\n if (skb_zerocopy(skb, entskb, data_len, hlen))\n goto nla_put_failure;\n\nIMPACT:\nCorrectness issue - violates netlink protocol. Could cause userspace\nparsers to misparse or crash if they don't check message boundaries.\n\nI can submit a formal patch if needed.\n\nBest regards,\nRamesh Adhikari\nSecurity Researcher\nhttps://iotsec.in" }