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Message-ID: <CAGXu5jKamEFzkR+iVxfZKJ_YK41E8a8ta1mQRY7tHfcz-NFwOA@mail.gmail.com>
Date: Thu, 29 Sep 2016 18:29:22 -0700
From: Kees Cook <keescook@...omium.org>
To: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>
Cc: AKASHI Takahiro <takahiro.akashi@...aro.org>, Mark Rutland <mark.rutland@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>, David Brown <david.brown@...aro.org>,
Will Deacon <will.deacon@....com>, Catalin Marinas <catalin.marinas@....com>,
Laura Abbott <labbott@...hat.com>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] WX Checking for arm64
On Thu, Sep 29, 2016 at 2:32 PM, Laura Abbott <labbott@...hat.com> wrote:
>
> Hi,
>
> This is an implementation to check for writable and executable pages on arm64.
> This is heavily based on the x86 version which uses the existing page table
> dumping code to do the checking. Some notes:
>
> - The W^X checking is important so this option should become defaut eventually.
> To make this feasible, the debugfs functionality has been split out as a
> separate option. I didn't see a good way to make it modular like x86 but
> an option should be good enough.
> - This checks all page tables registered with ptdump_register. I don't see this
> being called elsewhere right now though.
> - Once this is merged, I'd like to see about moving DEBUG_WX to the top level
> instead of having each arch call it in mark_rodata.
Awesome!
Yeah, I think we should take a look at refactoring x86, arm, and arm64
to use a common infrastructure with callbacks. That way other
architectures can gain all these features with just a few callbacks
implemented.
-Kees
>
> Laura Abbott (3):
> arm64: dump: Make ptdump debugfs a separate option
> arm64: dump: Make the page table dumping seq_file optional
> arm64: dump: Add checking for writable and exectuable pages
>
> arch/arm64/Kconfig.debug | 34 ++++++++++++++-
> arch/arm64/include/asm/ptdump.h | 25 ++++++++++-
> arch/arm64/mm/Makefile | 3 +-
> arch/arm64/mm/dump.c | 92 ++++++++++++++++++++++++++++-------------
> arch/arm64/mm/mmu.c | 2 +
> arch/arm64/mm/ptdump_debugfs.c | 33 +++++++++++++++
> 6 files changed, 157 insertions(+), 32 deletions(-)
> create mode 100644 arch/arm64/mm/ptdump_debugfs.c
>
> --
> 2.10.0
>
--
Kees Cook
Nexus Security
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