diff options
| author | Sabrina Dubroca <sd@queasysnail.net> | 2018-02-26 16:13:43 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-11 16:19:46 +0100 |
| commit | 94522bee72fd4ba2a4f1b6dc3e7439dc8f4ce501 (patch) | |
| tree | beec3368255f42ad90ca1d495e7e375ebb767d8e /drivers/edac/tile_edac.c | |
| parent | 65fe24fdbbe0f5292d3dd5201a49725d7be21d85 (diff) | |
net: ipv4: don't allow setting net.ipv4.route.min_pmtu below 68
[ Upstream commit c7272c2f1229125f74f22dcdd59de9bbd804f1c8 ]
According to RFC 1191 sections 3 and 4, ICMP frag-needed messages
indicating an MTU below 68 should be rejected:
A host MUST never reduce its estimate of the Path MTU below 68
octets.
and (talking about ICMP frag-needed's Next-Hop MTU field):
This field will never contain a value less than 68, since every
router "must be able to forward a datagram of 68 octets without
fragmentation".
Furthermore, by letting net.ipv4.route.min_pmtu be set to negative
values, we can end up with a very large PMTU when (-1) is cast into u32.
Let's also make ip_rt_min_pmtu a u32, since it's only ever compared to
unsigned ints.
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/edac/tile_edac.c')
0 files changed, 0 insertions, 0 deletions