From: Will Deacon <will.deacon@arm.com>
Date: Tue, 18 Dec 2012 14:15:15 +0000 (+0000)
Subject: arm64: mm: introduce present, faulting entries for PAGE_NONE
X-Git-Tag: v3.8-rc4~13^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6fadf7e67d3794aae40244f435d281a62736c93;p=pandora-kernel.git

arm64: mm: introduce present, faulting entries for PAGE_NONE

This is mostly a port of dbf62d50067e ("ARM: mm: introduce L_PTE_VALID
for page table entries") and 26ffd0d43b18 ("ARM: mm: introduce present,
faulting entries for PAGE_NONE") from ARM, which makes use of present,
faulting page table entries for page table entries mapped as PROT_NONE.

The main difference with this implementation is that we can make use of
the two pte type bits in order to avoid allocating a software bit for
identifying PROT_NONE pages, instead reserving the 10b suffix for these
types of mappings.

This is required to prevent users from accessing such pages via syscalls
such as read/write over a pipe.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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