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Message-ID: <CAGXu5jL8UBfs7NjSgKOeqd9toRgtW3gPu53TPLbTMRJiwRUvPg@mail.gmail.com>
Date: Mon, 1 Aug 2016 12:45:09 -0700
From: Kees Cook <keescook@...omium.org>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrew Morton <akpm@...ux-foundation.org>,
"David S. Miller" <davem@...emloft.net>, Mauro Carvalho Chehab <mchehab@....samsung.com>,
Jiri Slaby <jslaby@...e.cz>, Guenter Roeck <linux@...ck-us.net>, LKML <linux-kernel@...r.kernel.org>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, Anton Blanchard <anton@...ba.org>
Subject: Re: Linker segfault on powerpc when CONFIG_LKDTM=y (was Re:
[PATCH 3/5] lkdtm: add function for testing .rodata section)
On Mon, Aug 1, 2016 at 5:37 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
> Kees Cook <keescook@...omium.org> writes:
>
>> This adds a function that lives in the .rodata section. The section
>> flags are corrected using objcopy since there is no way with gcc to
>> declare section flags in an architecture-agnostic way.
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>> drivers/misc/Makefile | 7 +++++++
>> drivers/misc/lkdtm.h | 6 ++++++
>> drivers/misc/lkdtm_core.c | 24 +++++++++++++++++-------
>> drivers/misc/lkdtm_rodata.c | 10 ++++++++++
>> 4 files changed, 40 insertions(+), 7 deletions(-)
>> create mode 100644 drivers/misc/lkdtm.h
>> create mode 100644 drivers/misc/lkdtm_rodata.c
>
> This is blowing up my linker :(
>
> scripts/link-vmlinux.sh: line 52: 36260 Segmentation fault (core dumped) ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} -T ${lds} ${KBUILD_VMLINUX_INIT} --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
>
> Haven't had a chance to debug it further.
Argh. Do you want a quick fix for this now? I can add a PPC CONFIG
blacklist for the rodata check, maybe?
Also, what version of gcc? I'll see if I can reproduce this with a
cross compiler...
-Kees
--
Kees Cook
Chrome OS & Brillo Security
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