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{
    "id": 2219771,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2219771/?format=api",
    "project": {
        "id": 26,
        "url": "http://patchwork.ozlabs.org/api/1.0/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,
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    "msgid": "<89bf7d5997ef9cbb0902518677c6ec5f4de7e56b.1775260446.git.zcliangcn@gmail.com>",
    "date": "2026-04-04T09:39:47",
    "name": "[nf,v2,1/2] netfilter: ip6t_eui64: reject invalid MAC header for all packets",
    "commit_ref": null,
    "pull_url": null,
    "state": "under-review",
    "archived": false,
    "hash": "3ab7e9f3f0355c115ac542c17f4e9ae2c1804225",
    "submitter": {
        "id": 92912,
        "url": "http://patchwork.ozlabs.org/api/1.0/people/92912/?format=api",
        "name": "Ren Wei",
        "email": "n05ec@lzu.edu.cn"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/89bf7d5997ef9cbb0902518677c6ec5f4de7e56b.1775260446.git.zcliangcn@gmail.com/mbox/",
    "series": [
        {
            "id": 498710,
            "url": "http://patchwork.ozlabs.org/api/1.0/series/498710/?format=api",
            "date": "2026-04-04T09:39:47",
            "name": "[nf,v2,1/2] netfilter: ip6t_eui64: reject invalid MAC header for all packets",
            "version": 2,
            "mbox": "http://patchwork.ozlabs.org/series/498710/mbox/"
        }
    ],
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2219771/checks/",
    "tags": {},
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        "From": "Ren Wei <n05ec@lzu.edu.cn>",
        "To": "netfilter-devel@vger.kernel.org,\n\tnetdev@vger.kernel.org",
        "Cc": "pablo@netfilter.org,\n\tfw@strlen.de,\n\tphil@nwl.cc,\n\tdavem@davemloft.net,\n\tdsahern@kernel.org,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\thorms@kernel.org,\n\tyifanwucs@gmail.com,\n\ttomapufckgml@gmail.com,\n\tyuantan098@gmail.com,\n\tbird@lzu.edu.cn,\n\tenjou1224z@gmail.com,\n\tzcliangcn@gmail.com,\n\tn05ec@lzu.edu.cn",
        "Subject": "[PATCH nf v2 1/2] netfilter: ip6t_eui64: reject invalid MAC header\n for all packets",
        "Date": "Sat,  4 Apr 2026 17:39:47 +0800",
        "Message-ID": "\n <89bf7d5997ef9cbb0902518677c6ec5f4de7e56b.1775260446.git.zcliangcn@gmail.com>",
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    },
    "content": "From: Zhengchuan Liang <zcliangcn@gmail.com>\n\n`eui64_mt6()` derives a modified EUI-64 from the Ethernet source\naddress and compares it with the low 64 bits of the IPv6 source\naddress.\n\nThe existing guard only rejects an invalid MAC header when\n`par->fragoff != 0`. For packets with `par->fragoff == 0`,\n`eui64_mt6()` can still reach `eth_hdr(skb)` even when the MAC header\nis not valid.\n\nFix this by removing the `par->fragoff != 0` condition so that packets\nwith an invalid MAC header are rejected before accessing `eth_hdr(skb)`.\n\nFixes: 1da177e4c3f41 (\"Linux-2.6.12-rc2\")\nReported-by: Yifan Wu <yifanwucs@gmail.com>\nReported-by: Juefei Pu <tomapufckgml@gmail.com>\nCo-developed-by: Yuan Tan <yuantan098@gmail.com>\nSigned-off-by: Yuan Tan <yuantan098@gmail.com>\nSuggested-by: Xin Liu <bird@lzu.edu.cn>\nTested-by: Ren Wei <enjou1224z@gmail.com>\nSigned-off-by: Zhengchuan Liang <zcliangcn@gmail.com>\nSigned-off-by: Ren Wei <n05ec@lzu.edu.cn>\n---\nChanges in v2:\nThis patch specifically fixes the memory-safety issue in `eui64_mt6()`:\nthe old guard only rejected invalid MAC headers for non-first fragments,\nwhile our PoC triggers the KASAN report with a non-fragment packet\n(`par->fragoff == 0`). This patch is sufficient enough to fix the\nmemory-safety issue, and we do not find other `eth_hdr(skb)` users with\nsimilar use-after-free or out-of-bound issues.\n\n net/ipv6/netfilter/ip6t_eui64.c | 3 +--\n 1 file changed, 1 insertion(+), 2 deletions(-)",
    "diff": "diff --git a/net/ipv6/netfilter/ip6t_eui64.c b/net/ipv6/netfilter/ip6t_eui64.c\nindex d704f7ed300c2..da69a27e8332c 100644\n--- a/net/ipv6/netfilter/ip6t_eui64.c\n+++ b/net/ipv6/netfilter/ip6t_eui64.c\n@@ -22,8 +22,7 @@ eui64_mt6(const struct sk_buff *skb, struct xt_action_param *par)\n \tunsigned char eui64[8];\n \n \tif (!(skb_mac_header(skb) >= skb->head &&\n-\t      skb_mac_header(skb) + ETH_HLEN <= skb->data) &&\n-\t    par->fragoff != 0) {\n+\t      skb_mac_header(skb) + ETH_HLEN <= skb->data)) {\n \t\tpar->hotdrop = true;\n \t\treturn false;\n \t}\n",
    "prefixes": [
        "nf",
        "v2",
        "1/2"
    ]
}