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authorMarcelo Leitner2015-02-23 11:17:13 -0300
committerDavid S. Miller2015-02-23 18:16:12 -0500
commit77751427a1ff25b27d47a4c36b12c3c8667855ac (patch)
treeaecd97232dd3fe3977adcef402ea3be1b60eeef9 /.gitignore
parent8d4ac39df09c6f8078af60cd0ddd7b2435728e72 (diff)
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. Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com> Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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0 files changed, 0 insertions, 0 deletions