netdev - [PATCH ipsec-next 0/6] xfrm: remove xfrm_state_get

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-next>] [day] [month] [year] [list]

Message-Id: <1483968050-788-1-git-send-email-fw@strlen.de>
Date:   Mon,  9 Jan 2017 14:20:44 +0100
From:   Florian Westphal <fw@...len.de>
To:     <netdev@...r.kernel.org>
Subject: [PATCH ipsec-next 0/6] xfrm: remove xfrm_state_get_afinfo conditional rcu locking

xfrm_state_get_afinfo still uses a conditional locking scheme
dating back to when this still used an rwlock:

If return value is NULL, no lock (rcu readlock) was taken,
otherwise, rcu_read_unlock has to be called.

This series moves rcu read lock/unlock responsibility to the callers.

xfrm_state_put_afinfo is removed (it is equivalent
to rcu_read_unlock so thats what will be used instead).

xfrm_state_get_afinfo is renamed to xfrm_state_afinfo_get_rcu()
and is only a rcu dereference wrapper.

In one case, rcu read/unlock can be avoided as we're always
called with rcu read lock held.