linux-kernel - Using remap_pfn_range() to increase total_vm beyond RLIMIT

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Date:	Thu, 15 Oct 2009 14:17:30 -0700
From:	Earl Chew <earl_chew@...lent.com>
To:	linux-kernel@...r.kernel.org
Subject: Using remap_pfn_range() to increase total_vm beyond RLIMIT_AS

remap_pfn_range() is defined in mm/memory.c and as far as I
can tell, does _not_ cause total_vm or reserved_vm to be updated.

Is this right?

RLIMIT_AS is only checked against total_vm in mm/mmap.c in the function
may_expand_vm().

I think this means that a device driver can map pages into
a process and thus effectively increase address space of
a process above and beyond the limit set by RLIMIT_AS.

Am I reading the code correctly?

Earl

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