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Commit 07171da2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm 

Pull ARM updates from Russell King:
 "The main item in this pull request are the Spectre variant 1.1 fixes
  from Julien Thierry.

  A few other patches to improve various areas, and removal of some
  obsolete mcount bits and a redundant kbuild conditional"

* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8802/1: Call syscall_trace_exit even when system call skipped
  ARM: 8797/1: spectre-v1.1: harden __copy_to_user
  ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization
  ARM: 8795/1: spectre-v1.1: use put_user() for __put_user()
  ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit
  ARM: 8793/1: signal: replace __put_user_error with __put_user
  ARM: 8792/1: oabi-compat: copy oabi events using __copy_to_user()
  ARM: 8791/1: vfp: use __copy_to_user() when saving VFP state
  ARM: 8790/1: signal: always use __copy_to_user to save iwmmxt context
  ARM: 8789/1: signal: copy registers using __copy_to_user()
  ARM: 8801/1: makefile: use ARMv3M mode for RiscPC
  ARM: 8800/1: use choice for kernel unwinders
  ARM: 8798/1: remove unnecessary KBUILD_SRC ifeq conditional
  ARM: 8788/1: ftrace: remove old mcount support
  ARM: 8786/1: Debug kernel copy by printing
parents 034bda1c 3e98d240

arch/arm/Kconfig.debug

+26 −19
Original line number Diff line number Diff line
@@ -45,35 +45,42 @@ config DEBUG_WX 


		If in doubt, say "Y".



# RMK wants arm kernels compiled with frame pointers or stack unwinding.

# If you know what you are doing and are willing to live without stack

# traces, you can get a slightly smaller kernel by setting this option to

# n, but then RMK will have to kill you ;).

config FRAME_POINTER

	bool

	depends on !THUMB2_KERNEL

	default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER

choice

	prompt "Choose kernel unwinder"

	default UNWINDER_ARM if AEABI && !FUNCTION_GRAPH_TRACER

	default UNWINDER_FRAME_POINTER if !AEABI || FUNCTION_GRAPH_TRACER

	help

	  If you say N here, the resulting kernel will be slightly smaller and

	  faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,

	  when a problem occurs with the kernel, the information that is

	  reported is severely limited.

	  This determines which method will be used for unwinding kernel stack

	  traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,

	  livepatch, lockdep, and more.



config ARM_UNWIND

	bool "Enable stack unwinding support (EXPERIMENTAL)"

config UNWINDER_FRAME_POINTER

	bool "Frame pointer unwinder"

	depends on !THUMB2_KERNEL && !CC_IS_CLANG

	select ARCH_WANT_FRAME_POINTERS

	select FRAME_POINTER

	help

	  This option enables the frame pointer unwinder for unwinding

	  kernel stack traces.



config UNWINDER_ARM

	bool "ARM EABI stack unwinder"

	depends on AEABI

	default y

	select ARM_UNWIND

	help

	  This option enables stack unwinding support in the kernel

	  using the information automatically generated by the

	  compiler. The resulting kernel image is slightly bigger but

	  the performance is not affected. Currently, this feature

	  only works with EABI compilers. If unsure say Y.

	  only works with EABI compilers.



config OLD_MCOUNT

endchoice



config ARM_UNWIND

	bool



config FRAME_POINTER

	bool

	depends on FUNCTION_TRACER && FRAME_POINTER

	default y



config DEBUG_USER

	bool "Verbose user fault messages"

arch/arm/Makefile

+1 −5
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ endif 
arch-$(CONFIG_CPU_32v5)		=-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4t)

arch-$(CONFIG_CPU_32v4T)	=-D__LINUX_ARM_ARCH__=4 -march=armv4t

arch-$(CONFIG_CPU_32v4)		=-D__LINUX_ARM_ARCH__=4 -march=armv4

arch-$(CONFIG_CPU_32v3)		=-D__LINUX_ARM_ARCH__=3 -march=armv3

arch-$(CONFIG_CPU_32v3)		=-D__LINUX_ARM_ARCH__=3 -march=armv3m



# Evaluate arch cc-option calls now

arch-y := $(arch-y)
@@ -264,13 +264,9 @@ platdirs := $(patsubst %,arch/arm/plat-%/,$(sort $(plat-y))) 


ifneq ($(CONFIG_ARCH_MULTIPLATFORM),y)

ifneq ($(CONFIG_ARM_SINGLE_ARMV7M),y)

ifeq ($(KBUILD_SRC),)

KBUILD_CPPFLAGS += $(patsubst %,-I%include,$(machdirs) $(platdirs))

else

KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs) $(platdirs))

endif

endif

endif



export	TEXT_OFFSET GZFLAGS MMUEXT

arch/arm/boot/compressed/head.S

+43 −0
Original line number Diff line number Diff line
@@ -114,6 +114,35 @@ 
#endif

		.endm



		/*

		 * Debug kernel copy by printing the memory addresses involved

		 */

		.macro dbgkc, begin, end, cbegin, cend

#ifdef DEBUG

		kputc   #'\n'

		kputc   #'C'

		kputc   #':'

		kputc   #'0'

		kputc   #'x'

		kphex   \begin, 8	/* Start of compressed kernel */

		kputc	#'-'

		kputc	#'0'

		kputc	#'x'

		kphex	\end, 8		/* End of compressed kernel */

		kputc	#'-'

		kputc	#'>'

		kputc   #'0'

		kputc   #'x'

		kphex   \cbegin, 8	/* Start of kernel copy */

		kputc	#'-'

		kputc	#'0'

		kputc	#'x'

		kphex	\cend, 8	/* End of kernel copy */

		kputc	#'\n'

		kputc	#'\r'

#endif

		.endm



		.section ".start", #alloc, #execinstr

/*

 * sort out different calling conventions
@@ -450,6 +479,20 @@ dtb_check_done: 
		add	r6, r9, r5

		add	r9, r9, r10



#ifdef DEBUG

		sub     r10, r6, r5

		sub     r10, r9, r10

		/*

		 * We are about to copy the kernel to a new memory area.

		 * The boundaries of the new memory area can be found in

		 * r10 and r9, whilst r5 and r6 contain the boundaries

		 * of the memory we are going to copy.

		 * Calling dbgkc will help with the printing of this

		 * information.

		 */

		dbgkc	r5, r6, r10, r9

#endif



1:		ldmdb	r6!, {r0 - r3, r10 - r12, lr}

		cmp	r6, r5

		stmdb	r9!, {r0 - r3, r10 - r12, lr}

arch/arm/include/asm/assembler.h

+11 −0
Original line number Diff line number Diff line
@@ -467,6 +467,17 @@ THUMB( orr \reg , \reg , #PSR_T_BIT ) 
#endif

	.endm



	.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req

#ifdef CONFIG_CPU_SPECTRE

	sub	\tmp, \limit, #1

	subs	\tmp, \tmp, \addr	@ tmp = limit - 1 - addr

	addhs	\tmp, \tmp, #1		@ if (tmp >= 0) {

	subhss	\tmp, \tmp, \size	@ tmp = limit - (addr + size) }

	movlo	\addr, #0		@ if (tmp < 0) addr = NULL

	csdb

#endif

	.endm



	.macro	uaccess_disable, tmp, isb=1

#ifdef CONFIG_CPU_SW_DOMAIN_PAN

	/*

arch/arm/include/asm/ftrace.h

+0 −3
Original line number Diff line number Diff line
@@ -16,9 +16,6 @@ extern void __gnu_mcount_nc(void); 


#ifdef CONFIG_DYNAMIC_FTRACE

struct dyn_arch_ftrace {

#ifdef CONFIG_OLD_MCOUNT

	bool	old_mcount;

#endif

};



static inline unsigned long ftrace_call_adjust(unsigned long addr)