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Re: use-after-free in sock_wake_async

From Eric Dumazet <eric.dumazet@gmail.com>
Newsgroups linux.kernel
Subject Re: use-after-free in sock_wake_async
Date 2015-11-26 18:10 +0100
Message-ID <qz8dr-86E-1@gated-at.bofh.it> (permalink)
References (18 earlier) <qyR2W-3ZJ-9@gated-at.bofh.it> <qyRcC-43u-7@gated-at.bofh.it> <qz4We-5MB-3@gated-at.bofh.it> <qz77I-7ak-9@gated-at.bofh.it> <qz8dr-86E-3@gated-at.bofh.it>
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On Thu, 2015-11-26 at 18:03 +0100, Hannes Frederic Sowa wrote:

> My rationale was like this: we already have rcu to free the wq, so we
> don't add any more callbacks as current code. sock_alloc is right now
> 1136 bytes, which is huge, like 18 cachelines. I wouldn't think it does
> matter a lot as we thrash anyway. tcp_sock is like 45 cachelines right
> now, hui.

Again, these speculations are really killing me.

Can you wait I send my patches ?

They work just great, and there is no risk of perf regression with added
RCU freeing of inodes :(

It is Thanks Giving in the US, vacation time.

Thanks.


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Thread

use-after-free in sock_wake_async Dmitry Vyukov <dvyukov@google.com> - 2015-11-24 15:20 +0100
  Re: use-after-free in sock_wake_async Eric Dumazet <edumazet@google.com> - 2015-11-24 16:30 +0100
    Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-24 16:40 +0100
    Re: use-after-free in sock_wake_async Jason Baron <jbaron@akamai.com> - 2015-11-24 22:40 +0100
      Re: use-after-free in sock_wake_async Benjamin LaHaise <bcrl@kvack.org> - 2015-11-24 22:50 +0100
        Re: use-after-free in sock_wake_async Eric Dumazet <edumazet@google.com> - 2015-11-24 23:10 +0100
          Re: use-after-free in sock_wake_async Eric Dumazet <edumazet@google.com> - 2015-11-24 23:20 +0100
      Re: use-after-free in sock_wake_async Al Viro <viro@ZenIV.linux.org.uk> - 2015-11-24 22:50 +0100
    Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 00:40 +0100
      Re: use-after-free in sock_wake_async Eric Dumazet <edumazet@google.com> - 2015-11-25 00:50 +0100
        Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 02:20 +0100
        Re: use-after-free in sock_wake_async Eric Dumazet <edumazet@google.com> - 2015-11-25 02:20 +0100
          Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 03:30 +0100
            Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 06:50 +0100
              Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 15:20 +0100
          Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 17:50 +0100
            Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 18:20 +0100
              Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 18:40 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 19:00 +0100
                Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 19:30 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 19:40 +0100
                Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 20:40 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 21:00 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 21:30 +0100
                Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 22:00 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 23:10 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-25 23:40 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-25 23:50 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-26 00:00 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-26 14:40 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-26 15:40 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-26 17:00 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-26 18:10 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-26 18:20 +0100
                Re: use-after-free in sock_wake_async Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-26 18:10 +0100
                Re: use-after-free in sock_wake_async Eric Dumazet <eric.dumazet@gmail.com> - 2015-11-26 18:30 +0100
        Re: use-after-free in sock_wake_async Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2015-11-25 02:20 +0100

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