netdev - Re: Are xfrm state_add/delete() calls serialized?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 19 Sep 2022 12:29:53 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Bharat Bhushan <bbhushan2@...vell.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Are xfrm state_add/delete() calls serialized?

On Mon, Sep 12, 2022 at 03:10:12PM +0000, Bharat Bhushan wrote:
> Hi All,
> 
> Have a very basic query related to .xdo_dev_state_add()/delete() ops supported by netdev driver. Can .xdo_dev_state_add()/delete() execute from other core while already in process of handling .xdo_dev_state_add()/delete() on one core? Or these calls are always serialized by stack?

It is protected from userspace callers with xfrm_cfg_mutex in xfrm_netlink_rcv().
However, stack triggered deletion can be in parallel. There is a lock
for that specific SA that is going to be deleted, and it is not global.

> Wanted to know if we need proper locking while handling these ops in driver.
> 
> Thanks
> -Bharat