linux-kernel - Re: [PATCH v2 0/5] split ET

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Date:	Mon, 9 Mar 2015 15:15:26 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kees Cook <keescook@...omium.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, x86@...nel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	"David A. Long" <dave.long@...aro.org>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Arun Chandran <achandran@...sta.com>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Min-Hua Chen <orca.chen@...il.com>,
	Paul Burton <paul.burton@...tec.com>,
	Alex Smith <alex@...x-smith.me.uk>,
	Markos Chandras <markos.chandras@...tec.com>,
	Jeff Bailey <jeffbailey@...gle.com>,
	Vineeth Vijayan <vvijayan@...sta.com>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Hector Marco-Gisbert <hecmargi@....es>,
	Borislav Petkov <bp@...e.de>,
	Jan-Simon Möller <dl9pf@....de>,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 0/5] split ET_DYN ASLR from mmap ASLR

On Mon, Mar 02, 2015 at 04:19:43PM -0800, Kees Cook wrote:
> To address the "offset2lib" ASLR weakness[1], this separates ET_DYN
> ASLR from mmap ASLR, as already done on s390. The architectures
> that are already randomizing mmap (arm, arm64, mips, powerpc, s390,
> and x86), have their various forms of arch_mmap_rnd() made available
> via the new CONFIG_ARCH_HAS_ELF_RANDOMIZE. For these architectures,
> arch_randomize_brk() is collapsed as well.
> 
> This is an alternative to the solutions in:
> https://lkml.org/lkml/2015/2/23/442

I've run this on one of my ARM platforms, and it looks fine.

2a05e000-2a05f000 r-xp 00000000 00:10 7750376    /root/offset2lib/get_offset2lib
2a066000-2a067000 r--p 00000000 00:10 7750376    /root/offset2lib/get_offset2lib
2a067000-2a068000 rw-p 00001000 00:10 7750376    /root/offset2lib/get_offset2lib
b6dfd000-b6ed3000 r-xp 00000000 00:10 1376508    /lib/arm-linux-gnueabihf/libc-2.15.so
b6ed3000-b6eda000 ---p 000d6000 00:10 1376508    /lib/arm-linux-gnueabihf/libc-2.15.so
b6eda000-b6edc000 r--p 000d5000 00:10 1376508    /lib/arm-linux-gnueabihf/libc-2.15.so
b6edc000-b6edd000 rw-p 000d7000 00:10 1376508    /lib/arm-linux-gnueabihf/libc-2.15.so
b6edd000-b6ee0000 rw-p 00000000 00:00 0
b6ef9000-b6f10000 r-xp 00000000 00:10 1376509    /lib/arm-linux-gnueabihf/ld-2.15.so
b6f13000-b6f17000 rw-p 00000000 00:00 0
b6f17000-b6f18000 r--p 00016000 00:10 1376509    /lib/arm-linux-gnueabihf/ld-2.15.so
b6f18000-b6f19000 rw-p 00017000 00:10 1376509    /lib/arm-linux-gnueabihf/ld-2.15.so
bea3b000-bea5c000 rw-p 00000000 00:00 0          [stack]
bec22000-bec23000 r-xp 00000000 00:00 0          [sigpage]
ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]

And offset2lib shows a random offset:

Offset2lib (libc): 0xffffffff73261000
Offset2lib (libc): 0xffffffff732ce000
Offset2lib (libc): 0xffffffff731b1000
Offset2lib (libc): 0xffffffff73252000

So, for ARM:

Tested-by: Russell King <rmk+kernel@....linux.org.uk>

Thanks.

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