linux/arch/avr32/kernel
Andy Lutomirski f56141e3e2 all arches, signal: move restart_block to struct task_struct
If an attacker can cause a controlled kernel stack overflow, overwriting
the restart block is a very juicy exploit target.  This is because the
restart_block is held in the same memory allocation as the kernel stack.

Moving the restart block to struct task_struct prevents this exploit by
making the restart_block harder to locate.

Note that there are other fields in thread_info that are also easy
targets, at least on some architectures.

It's also a decent simplification, since the restart code is more or less
identical on all architectures.

[james.hogan@imgtec.com: metag: align thread_info::supervisor_stack]
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: David Miller <davem@davemloft.net>
Acked-by: Richard Weinberger <richard@nod.at>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Tested-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-12 18:54:12 -08:00
..
.gitignore avr32: add .gitignore files 2008-09-19 18:21:29 +02:00
asm-offsets.c all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
avr32_ksyms.c asm-generic: rename generic little-endian bitops functions 2011-03-23 19:46:11 -07:00
cpu.c avr32: replace simple_strtoul() with kstrtoul() 2014-04-01 09:09:25 +02:00
entry-avr32b.S avr32: fix out-of-range jump in large kernels 2013-11-20 09:53:21 +01:00
head.S avr32: setup crt for early panic() 2013-11-20 09:53:21 +01:00
irq.c driver-core: remove sysdev.h usage. 2011-12-21 16:26:03 -08:00
kprobes.c avr32: Replace __get_cpu_var with __this_cpu_write 2014-08-26 13:45:55 -04:00
Makefile avr32: switch to generic kernel_thread()/kernel_execve() 2012-10-15 11:14:38 -04:00
module.c module_arch_freeing_init(): new hook for archs before module->module_init freed. 2015-01-20 11:38:32 +10:30
nmi_debug.c [AVR32] NMI debugging 2008-01-25 08:31:43 +01:00
ocd.c libfs: allow error return from simple attributes 2008-02-08 09:22:34 -08:00
process.c avr32: cast syscall_return to silence compiler warning 2013-09-30 08:42:01 +02:00
ptrace.c ptrace: cleanup arch_ptrace() on avr32 2010-10-27 18:03:10 -07:00
setup.c avr32: normalize global variables exported by vmlinux.lds 2013-07-03 16:07:34 -07:00
signal.c all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
stacktrace.c fix core/stacktrace changes on avr32, mips, sh 2008-07-18 14:42:35 +02:00
switch_to.S [PATCH] avr32 architecture 2006-09-26 08:48:54 -07:00
syscall_table.S avr32: wire up missing syscalls 2015-02-09 15:27:44 +01:00
syscall-stubs.S avr32: wire up missing syscalls 2015-02-09 15:27:44 +01:00
time.c avr32: remove deprecated IRQF_DISABLED 2013-12-10 08:46:38 +01:00
traps.c taint: add explicit flag to show whether lock dep is still OK. 2013-01-21 17:17:57 +10:30
vmlinux.lds.S avr32: normalize global variables exported by vmlinux.lds 2013-07-03 16:07:34 -07:00