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| author | Eric Dumazet <edumazet@google.com> | 2020-10-15 11:42:00 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-29 09:05:32 +0100 |
| commit | df838165a187b7c699ec372a2a136f9873112776 (patch) | |
| tree | 4f9a54fe4a8d6dcbd8493b5ef81647de2cb4e6d0 /Documentation | |
| parent | 090178ce6f57e463b5db4b5f81f378d2ed837808 (diff) | |
| download | linux-stable-df838165a187b7c699ec372a2a136f9873112776.tar.gz linux-stable-df838165a187b7c699ec372a2a136f9873112776.tar.bz2 linux-stable-df838165a187b7c699ec372a2a136f9873112776.zip | |
icmp: randomize the global rate limiter
[ Upstream commit b38e7819cae946e2edf869e604af1e65a5d241c5 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 49935d5bb5c6..a374412610ba 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -887,12 +887,14 @@ 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 icmp_ratemask - INTEGER |