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
..
perf	metag: Replace __get_cpu_var uses for address calculation	2014-08-26 13:45:47 -04:00
.gitignore
asm-offsets.c
cachepart.c	metag: cachepart: Fix failure check	2014-07-18 10:36:59 +01:00
clock.c	metag: log core and timer frequencies from arch code	2013-06-13 12:55:27 +01:00
core_reg.c
da.c	metag: export _metag_da_present and cpu_2_hwthread_id	2013-03-27 14:37:52 +00:00
devtree.c	metag: use common of_flat_dt_match_machine	2013-10-09 20:03:57 -05:00
dma.c	metag: dma: remove dead code in dma_alloc_init()	2013-11-25 10:50:27 +00:00
ftrace.c	ftrace: Do not pass data to ftrace_dyn_arch_init	2014-03-07 10:06:14 -05:00
ftrace_stub.S	metag: ftrace: Remove check of obsolete variable function_trace_stop	2014-07-18 13:58:09 -04:00
head.S	metag: smp: copy cache partition and enable GCOn	2013-03-15 13:21:17 +00:00
irq.c	metag: Use irq_set_affinity instead of homebrewn code	2014-03-17 12:34:59 +00:00
kick.c	metag: kick: add missing irq_enter/exit to kick_handler()	2013-07-02 14:12:08 +01:00
machines.c
Makefile
metag_ksyms.c	metag: move EXPORT_SYMBOL(csum_partial) to metag_ksyms.c	2013-07-04 10:00:02 +01:00
module.c
perf_callchain.c
process.c	dump_stack: unify debug information printed by show_regs()	2013-04-30 17:04:02 -07:00
ptrace.c	metag: ptrace: Implement NT_METAG_TLS	2013-03-27 14:37:47 +00:00
setup.c	of/fdt: consolidate built-in dtb section variables	2014-04-30 00:59:13 -05:00
signal.c	all arches, signal: move restart_block to struct task_struct	2015-02-12 18:54:12 -08:00
smp.c	metag/smp: Make boot_secondary() static	2014-01-06 09:59:22 +00:00
stacktrace.c
sys_metag.c
tbiunexp.S
tcm.c
time.c	metag: init common clk and use "core" clk	2013-06-13 12:54:41 +01:00
topology.c	metag: topology: export 'cpu_core_map'	2013-12-19 11:36:13 +00:00
traps.c	metag: handle low level kicks directly	2013-11-06 10:40:02 +00:00
user_gateway.S
vmlinux.lds.S