ACK: [PATCH 0/3][SRU][B] CVE-2019-3874 - SCTP Denial of Service

[Kleber Souza]

On 4/18/19 9:50 AM, Tyler Hicks wrote:
> https://people.canonical.com/~ubuntu-security/cve/?cve=CVE-2019-3874
> 
>  The SCTP socket buffer used by a userspace application is not accounted by
>  the cgroups subsystem. An attacker can use this flaw to cause a denial of
>  service attack. Kernel 3.10.x and 4.18.x branches are believed to be
>  vulnerable.
> 
> Non-trivial backporting effort. Build logs are clean. I've regression tested
> these changes by moving 1 GiB of data using SCTP over the loopback interface.
> 
> Tyler
> 
> Xin Long (3):
>   sctp: use sk_wmem_queued to check for writable space
>   sctp: implement memory accounting on tx path
>   sctp: implement memory accounting on rx path
> 
>  include/net/sctp/sctp.h |  2 +-
>  net/sctp/sm_statefuns.c |  6 ++++--
>  net/sctp/socket.c       | 44 +++++++++++++++-----------------------------
>  net/sctp/ulpevent.c     | 19 ++++++++-----------
>  net/sctp/ulpqueue.c     |  3 ++-
>  5 files changed, 30 insertions(+), 44 deletions(-)
> 

Acked-by: Kleber Sacilotto de Souza <kleber.souza at canonical.com>