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
align.c
asm-offsets.c
entry.S	m32r: Use preempt_schedule_irq	2013-11-13 20:21:46 +01:00
head.S
irq.c
m32r_ksyms.c	kill stray kernel_thread() garbage	2012-11-28 21:53:36 -05:00
Makefile	m32r: Use generic init_task	2012-05-05 13:00:23 +02:00
module.c	Make most arch asm/module.h files use asm-generic/module.h	2012-09-28 14:31:03 +09:30
process.c	dump_stack: unify debug information printed by show_regs()	2013-04-30 17:04:02 -07:00
ptrace.c	m32r: fix 'fix breakage from "m32r: use generic ptrace_resume code"' fallout	2012-07-17 16:21:30 -07:00
setup.c
signal.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
smp.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
smpboot.c	m32r: delete __cpuinit usage from all m32r files	2013-07-14 19:36:55 -04:00
sys_m32r.c	m32r: switch to generic kernel_thread()/kernel_execve()	2012-10-31 22:59:31 -04:00
syscall_table.S	All Arch: remove linkage for sys_nfsservctl system call	2011-08-26 15:09:58 -07:00
time.c	m32r: remove deprecated IRQF_DISABLED	2014-10-09 22:25:46 -04:00
traps.c	dump_stack: consolidate dump_stack() implementations and unify their behaviors	2013-04-30 17:04:02 -07:00
vmlinux.lds.S