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Date: Tue, 23 Aug 2011 14:44:30 -0700
From: Andrew Morton <>
To: Vasiliy Kulikov <>
Cc:, Al Viro <>,
        David Rientjes <>,
        Stephen Wilson <>,
        KOSAKI Motohiro <>,,
Subject: Re: [PATCH] proc: fix races of /proc/PID/{fd/,fdinfo/,fdinfo/*}

On Thu, 4 Aug 2011 20:20:09 +0400
Vasiliy Kulikov <> wrote:

> fd* files are restricted to the task's owner, but keeping opened procfs
> file descriptors makes it possible to violate the permission model.
> Keeping fdinfo/* may disclosure current position and flags, keeping
> fdinfo/ and fd/ may disclosure number of opened files.
> Used existing (un)lock_trace functions to deal with the race.

what race.

When fixing a bug, please completely, utterly and exhaustively describe
the bug!

> CC: Stable Tree <>

And when cc'ing -stable, please make it very clear why you consider the
bug sufficiently serious to warant mackporting the fix into earlier

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