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linux/arch/unicore32/include/asm
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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
..
Kbuild net, lib: kill arch_fast_hash library bits 2014-12-10 15:17:46 -05:00
assembler.h unicore32 additional architecture files: low-level lib: misc 2011-03-17 09:19:13 +08:00
barrier.h arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h 2014-01-12 10:37:15 +01:00
bitops.h unicore32: fix build error for find bitops 2011-11-15 17:13:14 +08:00
bug.h UniCore32-bugfix: Remove definitions in asm/bug.h to solve difference between native and cross compiler 2012-11-09 17:30:09 +08:00
cache.h unicore32 core architecture: mm related: generic codes 2011-03-17 09:19:08 +08:00
cacheflush.h unicore32 core architecture: mm related: consistent device DMA handling 2011-03-17 09:19:09 +08:00
checksum.h unicore32 additional architecture files: low-level lib: misc 2011-03-17 09:19:13 +08:00
cmpxchg.h UniCore32-bugfix: fix mismatch return value of __xchg_bad_pointer 2012-11-09 17:30:09 +08:00
cpu-single.h unicore32 core architecture: processor and system headers 2011-03-17 09:19:06 +08:00
cputype.h unicore32 core architecture: processor and system headers 2011-03-17 09:19:06 +08:00
delay.h unicore32 additional architecture files: low-level lib: misc 2011-03-17 09:19:13 +08:00
dma-mapping.h Unicore32: adapt for dma_map_ops changes 2012-03-28 16:36:39 +02:00
dma.h unicore32 core architecture: mm related: consistent device DMA handling 2011-03-17 09:19:09 +08:00
elf.h unicore32 core architecture: generic elf and ksyms stuff 2011-03-17 09:19:05 +08:00
fpstate.h unicore32 additional architecture files: float point handling 2011-03-17 09:19:11 +08:00
fpu-ucf64.h unicore32 additional architecture files: float point handling 2011-03-17 09:19:11 +08:00
gpio.h unicore32 io: redefine __REG(x) and re-use readl/writel funcs 2011-03-17 09:19:19 +08:00
hwcap.h unicore32 core architecture: processor and system headers 2011-03-17 09:19:06 +08:00
hwdef-copro.h Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] 2012-03-28 18:30:03 +01:00
io.h arch:unicore32:mm: add devmem_is_allowed() to support STRICT_DEVMEM 2014-06-20 08:22:40 +08:00
irq.h unicore32: remove unused lines in arch/unicore32/include/asm/irq.h 2011-03-17 09:19:17 +08:00
irqflags.h unicore32 core architecture: interrupts ang gpio handling 2011-03-17 09:19:10 +08:00
linkage.h
…
memblock.h unicore32 core architecture: mm related: generic codes 2011-03-17 09:19:08 +08:00
memory.h mm/unicore32: fix stale comment about VALID_PAGE() 2013-07-03 16:07:40 -07:00
mmu.h unicore32 core architecture: mm related: fault handling 2011-03-17 09:19:09 +08:00
mmu_context.h mm: Make arch_unmap()/bprm_mm_init() available to all architectures 2014-11-19 11:54:13 +01:00
mutex.h unicore32 additional architecture files: low-level lib: misc 2011-03-17 09:19:13 +08:00
page.h unicore32 core architecture: mm related: generic codes 2011-03-17 09:19:08 +08:00
pci.h PCI: Turn pcibios_penalize_isa_irq() into a weak function 2014-05-27 16:23:58 -06:00
pgalloc.h unicore32: handle pgtable_page_ctor() fail 2013-11-15 09:32:19 +09:00
pgtable-hwdef.h unicore32: drop pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pgtable.h unicore32: drop pte_file()-related helpers 2015-02-10 14:30:33 -08:00
processor.h arch, locking: Ciao arch_mutex_cpu_relax() 2014-07-17 12:32:47 +02:00
ptrace.h arch/unicore32/include/asm/ptrace.h: add generic definition for profile_pc() 2014-06-20 08:22:38 +08:00
stacktrace.h unicore32 core architecture: process/thread related codes 2011-03-17 09:19:07 +08:00
string.h unicore32 core architecture: generic elf and ksyms stuff 2011-03-17 09:19:05 +08:00
suspend.h PM / Hibernate: Remove arch_prepare_suspend() 2011-05-24 23:35:55 +02:00
switch_to.h Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] 2012-03-28 18:30:03 +01:00
thread_info.h all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
timex.h unicore32 core architecture: timer and time handling 2011-03-17 09:19:10 +08:00
tlb.h unicore32: rewrite arch-specific tlb.h to use asm-generic version 2011-03-17 09:19:21 +08:00
tlbflush.h unicore32 core architecture: mm related: consistent device DMA handling 2011-03-17 09:19:09 +08:00
traps.h unicore32 core architecture: low level entry and setup codes 2011-03-17 09:19:06 +08:00
uaccess.h Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt] 2012-03-28 18:30:03 +01:00