linux-kernel - Re: [RFC/PATCH] revoke/frevoke system calls

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Message-ID: <84144f020608070345q58a9c12btc2eb57cd7bf8dd14@mail.gmail.com>
Date:	Mon, 7 Aug 2006 13:45:20 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Albert Cahalan" <acahalan@...il.com>
Cc:	froese@....de, B.Steinbrink@....de, hurtta+gmane@...lo.fmi.fi,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC/PATCH] revoke/frevoke system calls

Hi,

Edgar Toernig writes:
> > Urgs, so any user may remove mappings from another process and
> > let it crash?

On 7/22/06, Albert Cahalan <acahalan@...il.com> wrote:
> Two good solutions come to mind:
>
> a. substitute the zero page
> b. make the mapping private and touch it as if C-O-W happened

Actually, I think revokeat() and frevoke() should be consistent with
mmap which will make a process go SIGBUS if it attempts to write to
truncated shared mapping.

                                          Pekka
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