linux/arch/arm/vdso/vdso.S
David Brown 11bf9b8658 ARM/vdso: Mark the vDSO code read-only after init
Although the ARM vDSO is cleanly separated by code/data with the code
being read-only in userspace mappings, the code page is still writable
from the kernel.

There have been exploits (such as http://itszn.com/blog/?p=21) that
take advantage of this on x86 to go from a bad kernel write to full
root.

Prevent this specific exploit class on ARM as well by putting the vDSO
code page in post-init read-only memory as well.

Before:
	vdso: 1 text pages at base 80927000
	root@Vexpress:/ cat /sys/kernel/debug/kernel_page_tables
	---[ Modules ]---
	---[ Kernel Mapping ]---
	0x80000000-0x80100000           1M     RW NX SHD
	0x80100000-0x80600000           5M     ro x  SHD
	0x80600000-0x80800000           2M     ro NX SHD
	0x80800000-0xbe000000         984M     RW NX SHD

After:
	vdso: 1 text pages at base 8072b000
	root@Vexpress:/ cat /sys/kernel/debug/kernel_page_tables
	---[ Modules ]---
	---[ Kernel Mapping ]---
	0x80000000-0x80100000           1M     RW NX SHD
	0x80100000-0x80600000           5M     ro x  SHD
	0x80600000-0x80800000           2M     ro NX SHD
	0x80800000-0xbe000000         984M     RW NX SHD

Inspired by https://lkml.org/lkml/2016/1/19/494 based on work by the
PaX Team, Brad Spengler, and Kees Cook.

Signed-off-by: David Brown <david.brown@linaro.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brad Spengler <spender@grsecurity.net>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Emese Revfy <re.emese@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nathan Lynch <nathan_lynch@mentor.com>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-hardening@lists.openwall.com
Cc: linux-arch <linux-arch@vger.kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1455748879-21872-8-git-send-email-keescook@chromium.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-22 08:51:39 +01:00

35 lines
972 B
ArmAsm

/*
* Adapted from arm64 version.
*
* Copyright (C) 2012 ARM Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/const.h>
#include <asm/page.h>
.globl vdso_start, vdso_end
.section .data..ro_after_init
.balign PAGE_SIZE
vdso_start:
.incbin "arch/arm/vdso/vdso.so"
.balign PAGE_SIZE
vdso_end:
.previous