FROMGIT: tcp: enforce tcp_min_snd_mss in tcp_mtu_probing()
commit 967c05aee439e6e5d7d805e195b3a20ef5c433d6 upstream.
If mtu probing is enabled tcp_mtu_probing() could very well end up
with a too small MSS.
Use the new sysctl tcp_min_snd_mss to make sure MSS search
is performed in an acceptable range.
CVE-2019-11479 -- tcp mss hardcoded to 48
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Cc: Jonathan Looney <jtl@netflix.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Bruce Curtis <brucec@netflix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit f2aa4f1a05e0987e812809dbc489bd294fdae5ae
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.14.y)
Signed-off-by: Robert Kolchmeyer <rkolchmeyer@google.com>
BUG=b:135494242
TEST=build and run
Change-Id: Ic08f2003ee800920a66dce3198f88ba2c548f4ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1670614
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>
1 file changed
