linux-kernel - [PATCH 4.14 050/118] ipv6: sr: fix TLVs not being copied using setsockopt

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Date:   Mon, 15 Jan 2018 13:34:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Lebrun <dlebrun@...gle.com>,
        Mathieu Xhonneux <m.xhonneux@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 050/118] ipv6: sr: fix TLVs not being copied using setsockopt

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathieu Xhonneux <m.xhonneux@...il.com>


[ Upstream commit ccc12b11c5332c84442ef120dcd631523be75089 ]

Function ipv6_push_rthdr4 allows to add an IPv6 Segment Routing Header
to a socket through setsockopt, but the current implementation doesn't
copy possible TLVs at the end of the SRH received from userspace.

Therefore, the execution of the following branch if (sr_has_hmac(sr_phdr))
{ ... } will never complete since the len and type fields of a possible
HMAC TLV are not copied, hence seg6_get_tlv_hmac will return an error,
and the HMAC will not be computed.

This commit adds a memcpy in case TLVs have been appended to the SRH.

Fixes: a149e7c7ce81 ("ipv6: sr: add support for SRH injection through setsockopt")
Acked-by: David Lebrun <dlebrun@...gle.com>
Signed-off-by: Mathieu Xhonneux <m.xhonneux@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/exthdrs.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -884,6 +884,15 @@ static void ipv6_push_rthdr4(struct sk_b
 	sr_phdr->segments[0] = **addr_p;
 	*addr_p = &sr_ihdr->segments[sr_ihdr->segments_left];
 
+	if (sr_ihdr->hdrlen > hops * 2) {
+		int tlvs_offset, tlvs_length;
+
+		tlvs_offset = (1 + hops * 2) << 3;
+		tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3;
+		memcpy((char *)sr_phdr + tlvs_offset,
+		       (char *)sr_ihdr + tlvs_offset, tlvs_length);
+	}
+
 #ifdef CONFIG_IPV6_SEG6_HMAC
 	if (sr_has_hmac(sr_phdr)) {
 		struct net *net = NULL;