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| author | Eric Dumazet <edumazet@google.com> | 2020-10-15 11:42:00 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-10-16 16:47:09 -0700 |
| commit | b38e7819cae946e2edf869e604af1e65a5d241c5 (patch) | |
| tree | 3950efd4431d1dfa82b181415329aac165e48d50 /Documentation/networking/ip-sysctl.rst | |
| parent | 137d23cea1c044b2d4853ac71bc68126b25fdbb2 (diff) | |
| download | linux-b38e7819cae946e2edf869e604af1e65a5d241c5.tar.bz2 | |
icmp: randomize the global rate limiter
Keyu Man reported that the ICMP rate limiter could be used
by attackers to get useful signal. Details will be provided
in an upcoming academic publication.
Our solution is to add some noise, so that the attackers
no longer can get help from the predictable token bucket limiter.
Fixes: 4cdf507d5452 ("icmp: add a global rate limitation")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Keyu Man <kman001@ucr.edu>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking/ip-sysctl.rst')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index 837d51f9e1fa..25e6673a085a 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -1142,13 +1142,15 @@ icmp_ratelimit - INTEGER icmp_msgs_per_sec - INTEGER Limit maximal number of ICMP packets sent per second from this host. Only messages whose type matches icmp_ratemask (see below) are - controlled by this limit. + controlled by this limit. For security reasons, the precise count + of messages per second is randomized. Default: 1000 icmp_msgs_burst - INTEGER icmp_msgs_per_sec controls number of ICMP packets sent per second, while icmp_msgs_burst controls the burst size of these packets. + For security reasons, the precise burst size is randomized. Default: 50 |