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Commit 21266be9 authored by Dan Williams's avatar Dan Williams
Browse files

arch: consolidate CONFIG_STRICT_DEVM in lib/Kconfig.debug 



Let all the archs that implement devmem_is_allowed() opt-in to a common
definition of CONFIG_STRICT_DEVM in lib/Kconfig.debug.

Cc: Kees Cook <keescook@chromium.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
[heiko: drop 'default y' for s390]
Acked-by: default avatarIngo Molnar <mingo@redhat.com>
Suggested-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 9f9499ae

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ config ARM 
	bool

	default y

	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_HAS_ELF_RANDOMIZE

	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

	select ARCH_HAVE_CUSTOM_GPIO_H

arch/arm/Kconfig.debug

+0 −14
Original line number Diff line number Diff line
@@ -15,20 +15,6 @@ config ARM_PTDUMP 
	  kernel.

	  If in doubt, say "N"



config STRICT_DEVMEM

	bool "Filter access to /dev/mem"

	depends on MMU

	---help---

	  If this option is disabled, you allow userspace (root) access to all

	  of memory, including kernel and userspace memory. Accidental

	  access to this is obviously disastrous, but specific access can

	  be used by people debugging the kernel.



	  If this option is switched on, the /dev/mem file only allows

	  userspace access to memory mapped peripherals.



          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

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ config ARM64 
	select ACPI_CCA_REQUIRED if ACPI

	select ACPI_GENERIC_GSI if ACPI

	select ACPI_REDUCED_HARDWARE_ONLY if ACPI

	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

	select ARCH_HAS_ELF_RANDOMIZE

	select ARCH_HAS_GCOV_PROFILE_ALL

arch/arm64/Kconfig.debug

+0 −14
Original line number Diff line number Diff line
@@ -14,20 +14,6 @@ config ARM64_PTDUMP 
	  kernel.

	  If in doubt, say "N"



config STRICT_DEVMEM

	bool "Filter access to /dev/mem"

	depends on MMU

	help

	  If this option is disabled, you allow userspace (root) access to all

	  of memory, including kernel and userspace memory. Accidental

	  access to this is obviously disastrous, but specific access can

	  be used by people debugging the kernel.



	  If this option is switched on, the /dev/mem file only allows

	  userspace access to memory mapped peripherals.



	  If in doubt, say Y.



config PID_IN_CONTEXTIDR

	bool "Write the current PID to the CONTEXTIDR register"

	help

arch/frv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ config FRV 
	select HAVE_DEBUG_BUGVERBOSE

	select ARCH_HAVE_NMI_SAFE_CMPXCHG

	select GENERIC_CPU_DEVICES

	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_WANT_IPC_PARSE_VERSION

	select OLD_SIGSUSPEND3

	select OLD_SIGACTION