linux/arch/c6x/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
..
Makefile
asm-offsets.c sanitize tsk_is_polling() 2012-10-01 09:58:13 -04:00
c6x_ksyms.c C6X: loadable module support 2011-10-06 19:48:13 -04:00
devicetree.c of: remove early_init_dt_setup_initrd_arch 2013-10-09 11:39:01 -05:00
dma.c C6X: memory management and DMA support 2011-10-06 19:47:37 -04:00
entry.S c6x: switch to generic sigaltstack 2013-02-03 18:15:52 -05:00
head.S
irq.c C6X: remove dependence on legacy IRQs 2012-07-18 23:49:40 -04:00
module.c C6X: loadable module support 2011-10-06 19:48:13 -04:00
process.c c6x: Use generic idle loop 2013-04-08 17:39:24 +02:00
ptrace.c C6X: ptrace support 2011-10-06 19:48:17 -04:00
setup.c c6x: convert fdt pointers to opaque pointers 2014-04-30 00:59:12 -05:00
signal.c all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
soc.c arch: Use eth_random_addr 2012-07-16 22:39:25 -07:00
switch_to.S C6X: process management 2011-10-06 19:47:40 -04:00
sys_c6x.c C6X: syscalls 2011-10-06 19:47:58 -04:00
time.c Disintegrate asm/system.h for C6X 2012-03-28 18:30:02 +01:00
traps.c dump_stack: unify debug information printed by show_regs() 2013-04-30 17:04:02 -07:00
vectors.S
vmlinux.lds.S c6x: use boot_command_line instead of private c6x_command_line 2013-10-09 11:37:27 -05:00