From: Florian Westphal fw@strlen.de
mainline inclusion from mainline-v5.19-rc3 commit 99a63d36cb3ed5ca3aa6fcb64cffbeaf3b0fb164 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5J9R4 CVE: CVE-2022-36946
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Domingo Dirutigliano and Nicola Guerrera report kernel panic when sending nf_queue verdict with 1-byte nfta_payload attribute.
The IP/IPv6 stack pulls the IP(v6) header from the packet after the input hook.
If user truncates the packet below the header size, this skb_pull() will result in a malformed skb (skb->len < 0).
Fixes: 7af4cc3fa158 ("[NETFILTER]: Add "nfnetlink_queue" netfilter queue handler over nfnetlink") Reported-by: Domingo Dirutigliano pwnzer0tt1@proton.me Signed-off-by: Florian Westphal fw@strlen.de Reviewed-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Reviewed-by: Wei Yongjun weiyongjun1@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- net/netfilter/nfnetlink_queue.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c index a5aff2834bd6..cd496b074a71 100644 --- a/net/netfilter/nfnetlink_queue.c +++ b/net/netfilter/nfnetlink_queue.c @@ -850,11 +850,16 @@ nfqnl_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum) }
static int -nfqnl_mangle(void *data, int data_len, struct nf_queue_entry *e, int diff) +nfqnl_mangle(void *data, unsigned int data_len, struct nf_queue_entry *e, int diff) { struct sk_buff *nskb;
if (diff < 0) { + unsigned int min_len = skb_transport_offset(e->skb); + + if (data_len < min_len) + return -EINVAL; + if (pskb_trim(e->skb, data_len)) return -ENOMEM; } else if (diff > 0) {