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ipv6: addrconf: validate new MTU before applying it
Currently we don't check if the new MTU is valid or not and this allows one to configure a smaller than minimum allowed by RFCs or even bigger than interface own MTU, which is a problem as it may lead to packet drops. If you have a daemon like NetworkManager running, this may be exploited by remote attackers by forging RA packets with an invalid MTU, possibly leading to a DoS. (NetworkManager currently only validates for values too small, but not for too big ones.) The fix is just to make sure the new value is valid. That is, between IPV6_MIN_MTU and interface's MTU. Note that similar check is already performed at ndisc_router_discovery(), for when kernel itself parses the RA. Change-Id: I6b70d0c12a77c7932066982f8797d8024f130d7c Signed-off-by: Marcelo Ricardo Leitner <email@example.com> Signed-off-by: Sabrina Dubroca <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com>
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