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Date: Mon, 29 Aug 2011 16:02:10 -0700
From: Andrew Morton <>
To: Vasiliy Kulikov <>
Cc:, Cyrill Gorcunov
        Al Viro <>,
        David Rientjes
        Stephen Wilson <>,
        KOSAKI Motohiro
Subject: Re: [PATCH v3] proc: fix races against execve() of /proc/PID/fd**

On Mon, 29 Aug 2011 22:00:11 +0400
Vasiliy Kulikov <> wrote:

> Used existing (un)lock_trace functions to check for ptrace_may_access(),
> but instead of using EPERM return code from it use EACCES to be
> consistent with existing proc_pid_follow_link()/proc_pid_readlink()
> return code.  If they differ, attacker can guess what fds exist by
> analyzing stat() return code.

doh, I missed that bit.  Fair enough.

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