On Fri, Jun 18, 2021 at 02:51:22AM -0700, Amit Klein wrote:
Subject: inet: use bigger hash table for IP ID generation (backported to 4.14) From: Amit Klein aksecurity@gmail.com
This is a backport to 4.14 of the following patch, originally developed by Eric Dumazet.
In commit 73f156a6e8c1 ("inetpeer: get rid of ip_id_count") I used a very small hash table that could be abused by patient attackers to reveal sensitive information.
Switch to a dynamic sizing, depending on RAM size.
Typical big hosts will now use 128x more storage (2 MB) to get a similar increase in security and reduction of hash collisions.
As a bonus, use of alloc_large_system_hash() spreads allocated memory among all NUMA nodes.
Fixes: 73f156a6e8c1 ("inetpeer: get rid of ip_id_count") Reported-by: Amit Klein aksecurity@gmail.com Cc: stable@vger.kernel.org Cc: Eric Dumazet edumazet@google.com Cc: Willy Tarreau w@1wt.eu
What is the git commit id of this patch in Linus's tree?
thanks,
greg k-h