diff options
| author | Qingfang Deng <qingfang.deng@linux.dev> | 2026-04-15 10:24:51 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-04-20 11:35:17 -0700 |
| commit | cc1ff87bce1ccd38410ab10960f576dcd17db679 (patch) | |
| tree | 6d5bc0dc6df8cd6664041012d4a4740bca42baf0 /drivers/net | |
| parent | d6c19b31a3c1d519fabdcf0aa239e6b6109b9473 (diff) | |
pppoe: drop PFC frames
RFC 2516 Section 7 states that Protocol Field Compression (PFC) is NOT
RECOMMENDED for PPPoE. In practice, pppd does not support negotiating
PFC for PPPoE sessions, and the current PPPoE driver assumes an
uncompressed (2-byte) protocol field. However, the generic PPP layer
function ppp_input() is not aware of the negotiation result, and still
accepts PFC frames.
If a peer with a broken implementation or an attacker sends a frame with
a compressed (1-byte) protocol field, the subsequent PPP payload is
shifted by one byte. This causes the network header to be 4-byte
misaligned, which may trigger unaligned access exceptions on some
architectures.
To reduce the attack surface, drop PPPoE PFC frames. Introduce
ppp_skb_is_compressed_proto() helper function to be used in both
ppp_generic.c and pppoe.c to avoid open-coding.
Fixes: 7fb1b8ca8fa1 ("ppp: Move PFC decompression to PPP generic layer")
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260415022456.141758-2-qingfang.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ppp/ppp_generic.c | 2 | ||||
| -rw-r--r-- | drivers/net/ppp/pppoe.c | 8 |
2 files changed, 8 insertions, 2 deletions
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index b0d3bc49c685..57c68efa5ff8 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -2245,7 +2245,7 @@ ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch) */ static void __ppp_decompress_proto(struct sk_buff *skb) { - if (skb->data[0] & 0x01) + if (ppp_skb_is_compressed_proto(skb)) *(u8 *)skb_push(skb, 1) = 0x00; } diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c index d546a7af0d54..bdd61c504a1c 100644 --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -393,7 +393,7 @@ static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, if (skb_mac_header_len(skb) < ETH_HLEN) goto drop; - if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) + if (!pskb_may_pull(skb, PPPOE_SES_HLEN)) goto drop; ph = pppoe_hdr(skb); @@ -403,6 +403,12 @@ static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, if (skb->len < len) goto drop; + /* skb->data points to the PPP protocol header after skb_pull_rcsum. + * Drop PFC frames. + */ + if (ppp_skb_is_compressed_proto(skb)) + goto drop; + if (pskb_trim_rcsum(skb, len)) goto drop; |