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| author | Eric Dumazet <edumazet@google.com> | 2021-03-24 14:53:37 -0700 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-06-30 08:48:27 -0400 |
| commit | 7f7e23df8509e072593200400a4b094cc44376d2 (patch) | |
| tree | 04df188cebb7adc6a9002a7b7eddb68b294b0200 /kernel/sysctl.c | |
| parent | d42c3ebb315618ca536ef764e3f929ce1d5c3485 (diff) | |
inet: use bigger hash table for IP ID generation
commit aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba upstream.
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>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/sysctl.c')
0 files changed, 0 insertions, 0 deletions