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Message-ID: <CAGXu5jLcvKMOXEMXix3iMzssnN1f26GCaMMGzOK=xXze=Y07kw@mail.gmail.com>
Date: Thu, 7 Dec 2017 09:45:02 -0800
From: Kees Cook <keescook@...omium.org>
To: Jinbum Park <jinb.park7@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
kernel-hardening@...ts.openwall.com, Afzal Mohammed <afzal.mohd.ma@...il.com>,
Mark Rutland <mark.rutland@....com>, Laura Abbott <labbott@...hat.com>,
Russell King <linux@...linux.org.uk>, Greg KH <gregkh@...uxfoundation.org>,
Vladimir Murzin <vladimir.murzin@....com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v4 0/3] arm: Makes ptdump resuable and
add WX page checking
On Wed, Dec 6, 2017 at 2:23 AM, Jinbum Park <jinb.park7@...il.com> wrote:
> Hi,
>
> Page table dumping code for arm64-x86 is reusable,
> and they have function for WX page checking.
> But arm doesn't have that.
>
> This path series are to makes ptdump reusable,
> and add WX page checking for arm.
> This is heavily based on arm64 version.
>
> v2 :
> Fix a sender name of mail header, there was an mistake.
> (from "jinb.park" to Jinbum Park)
> Contents of patch-set are perfectly same.
>
> v3 :
> Take advantage of the existing pg_level and bits arrays
> to check ro, nx prot.
>
> v4 :
> Add boolean for ro_bit, nx_bit into prot_bits
> to point ro_bit, nx_bit in pg_level.
> This change is suggested by Laura Abbott.
>
> jinb.park (3):
> arm: mm: dump: make page table dumping reusable
> arm: mm: dump: make the page table dumping seq_file optional
> arm: mm: dump: add checking for writable and executable pages
>
> arch/arm/Kconfig.debug | 33 ++++++++-
> arch/arm/include/asm/ptdump.h | 56 ++++++++++++++++
> arch/arm/mm/Makefile | 3 +-
> arch/arm/mm/dump.c | 151 +++++++++++++++++++++++++++++-------------
> arch/arm/mm/init.c | 2 +
> arch/arm/mm/ptdump_debugfs.c | 34 ++++++++++
> 6 files changed, 232 insertions(+), 47 deletions(-)
> create mode 100644 arch/arm/include/asm/ptdump.h
> create mode 100644 arch/arm/mm/ptdump_debugfs.c
Please consider this series:
Reviewed-by: Kees Cook <keescook@...omium.org>
With Laura's review, this is probably ready to put into the ARM patch tracker.
-Kees
--
Kees Cook
Pixel Security
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