Now the problem comes from TCP layer only. Is the IP over ATM operates over IP
layer?
14.02.2019, 19:43, "David Miller" <da...@davemloft.net>:
> From: Nazarov Sergey <s-naza...@yandex.ru>
> Date: Tue, 12 Feb 2019 18:10:03 +0300
>
>> Since cipso_v4_error might be called from different network stack layers,
>> we can't safely use icmp_send there.
>> icmp_send copies IP options with ip_option_echo, which uses IPCB to take
>> access to IP header compiled data.
>> But after commit 971f10ec ("tcp: better TCP_SKB_CB layout to reduce cache
>> line misses"), IPCB can't be used
>> above IP layer.
>> This patch fixes the problem by creating in cipso_v4_error a local copy of
>> compiled IP options and using it with
>> introduced __icmp_send function. This looks some overloaded, but in quite
>> rare error conditions only.
>>
>> The original discussion is here:
>>
>> https://lore.kernel.org/linux-security-module/16659801547571...@sas1-890ba5c2334a.qloud-c.yandex.net/
>>
>> Signed-off-by: Sergey Nazarov <s-naza...@yandex.ru>
>
> This problem is not unique to Cipso, net/atm/clip.c's error handler
> has the same exact issue.
>
> I didn't scan more of the tree, there are probably a couple more
> locations as well.
