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Date: Sat, 15 Apr 2017 11:50:48 -0700
From: Kees Cook <keescook@...omium.org>
To: Laura Abbott <labbott@...hat.com>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Michael Leibowitz <michael.leibowitz@...el.com>
Subject: Re: [PATCH 00/18] Introduce struct layout
randomization plugin
On Thu, Apr 13, 2017 at 4:39 PM, Laura Abbott <labbott@...hat.com> wrote:
> I gave this a quick spin on my aarch64 Rawhide machine. I needed to
> change the following to work with gcc7
>
> diff --git a/scripts/gcc-plugins/randomize_layout_plugin.c b/scripts/gcc-plugins/randomize_layout_plugin.c
> index a2d7e933c33f..8dd5134f161a 100644
> --- a/scripts/gcc-plugins/randomize_layout_plugin.c
> +++ b/scripts/gcc-plugins/randomize_layout_plugin.c
> @@ -529,8 +529,8 @@ static void randomize_layout_finish_decl(void *event_data, void *data)
>
> DECL_SIZE(decl) = 0;
> DECL_SIZE_UNIT(decl) = 0;
> - DECL_ALIGN(decl) = 0;
> - DECL_MODE (decl) = VOIDmode;
> + SET_DECL_ALIGN(decl, 0);
> + SET_DECL_MODE(decl, VOIDmode);
> SET_DECL_RTL(decl, 0);
> update_decl_size(decl);
> layout_decl(decl, 0);
Very cool, thanks! I'll adjust the common header file to provide these
macros for gcc pre-7 builds and update the series.
> It boots but dies with a bunch of kernel faults somewhere after reaching
> userspace. I'll pick up the debugging next week.
I've been thinking about splitting up the structure marking patch into
per-structure markings to make failure bisection easier. I assume
there's a specific structure that is misbehaving on aarch64 (my first
guess is always task_struct).
-Kees
--
Kees Cook
Pixel Security
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