Re: [PATCH 4.14] inet: use bigger hash table for IP ID generation (backported to 4.14)

I believe you ask about this one:
[ Upstream commit aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba ]



On Fri, Jun 18, 2021 at 1:24 PM Greg KH [off-list ref] wrote:

On Fri, Jun 18, 2021 at 02:51:22AM -0700, Amit Klein wrote:

quoted

Subject: inet: use bigger hash table for IP ID generation (backported to 4.14)
From: Amit Klein <redacted>

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 <redacted>
Cc: stable@vger.kernel.org
Cc: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
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What is the git commit id of this patch in Linus's tree?

thanks,

greg k-h