netdev - Re: [PATCH net-next v3 2/3] udp: implement memory accounting helpers

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]

Message-ID: <1475158408.28155.166.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Thu, 29 Sep 2016 07:13:28 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        James Morris <jmorris@...ei.org>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Alexander Duyck <aduyck@...antis.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Tom Herbert <tom@...bertland.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Edward Cree <ecree@...arflare.com>, linux-nfs@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/3] udp: implement memory accounting helpers

On Thu, 2016-09-29 at 16:01 +0200, Paolo Abeni wrote:

> When we reach __sk_mem_reduce_allocated() we are sure we can free the
> specified amount of memory, so we only need to ensure consistent
> sk_prot->memory_allocated updates. The current atomic operation suffices
> to this.

Then why are you updating sk->sk_forward_alloc using racy operations ?

If this is not needed or racy, do not do it.

So that we can remove this annoying thing that a dynamic checker could
very well detect.