netdev - [PATCH v2] net: drop bogus skb with CHECKSUM_PARTIAL and offset beyond end of trimmed packet

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Message-ID: <1b2494af-2c56-8ee2-7bc0-923fcad1cdf8@virtuozzo.com>
Date:   Mon, 14 Dec 2020 22:07:39 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org
Subject: [PATCH v2] net: drop bogus skb with CHECKSUM_PARTIAL and offset
 beyond end of trimmed packet

syzbot reproduces BUG_ON in skb_checksum_help():
tun creates (bogus) skb with huge partial-checksummed area and
small ip packet inside. Then ip_rcv trims the skb based on size
of internal ip packet, after that csum offset points beyond of
trimmed skb. Then checksum_tg() called via netfilter hook
triggers BUG_ON:

        offset = skb_checksum_start_offset(skb);
        BUG_ON(offset >= skb_headlen(skb));

To work around the problem this patch forces pskb_trim_rcsum_slow()
to return -EINVAL in described scenario. It allows its callers to
drop such kind of packets.

Link: https://syzkaller.appspot.com/bug?id=b419a5ca95062664fe1a60b764621eb4526e2cd0
Reported-by: syzbot+7010af67ced6105e5ab6@...kaller.appspotmail.com
Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
v2: drop bogus packets instead change its CHECKSUM_PARTIAL to CHECKSUM_NONE 

 net/core/skbuff.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index e578544..fbadd93 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2011,6 +2011,12 @@ int pskb_trim_rcsum_slow(struct sk_buff *skb, unsigned int len)
 		skb->csum = csum_block_sub(skb->csum,
 					   skb_checksum(skb, len, delta, 0),
 					   len);
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		int hdlen = (len > skb_headlen(skb)) ? skb_headlen(skb) : len;
+		int offset = skb_checksum_start_offset(skb) + skb->csum_offset;
+
+		if (offset + sizeof(__sum16) > hdlen)
+			return -EINVAL;
 	}
 	return __pskb_trim(skb, len);
 }
-- 
1.8.3.1