Re: [RFC/PATCH] revoke/frevoke system calls

From: Pekka Enberg
Date: Mon Aug 07 2006 - 06:43:02 EST


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

On 7/22/06, Albert Cahalan <acahalan@xxxxxxxxx> 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.

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