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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 metag: Build infrastructure 2013-03-02 20:09:54 +00:00
Makefile metag: Add JTAG Debug Adapter (DA) support 2013-03-02 20:09:56 +00:00
asm-offsets.c metag: Build infrastructure 2013-03-02 20:09:54 +00:00
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 metag: SMP support 2013-03-02 20:09:51 +00:00
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
…
metag_ksyms.c metag: move EXPORT_SYMBOL(csum_partial) to metag_ksyms.c 2013-07-04 10:00:02 +01:00
module.c metag: Module support 2013-03-02 20:09:49 +00:00
perf_callchain.c metag: Perf 2013-03-02 20:09:54 +00:00
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 metag: Stack unwinding 2013-03-02 20:09:52 +00:00
sys_metag.c metag: System Calls 2013-03-02 20:09:49 +00:00
tbiunexp.S metag: Traps 2013-03-02 20:09:45 +00:00
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 metag: System Calls 2013-03-02 20:09:49 +00:00
vmlinux.lds.S metag: Build infrastructure 2013-03-02 20:09:54 +00:00