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arch: consolidate CONFIG_STRICT_DEVM in lib/Kconfig.debug

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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 <[email protected]>
Cc: Russell King <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "David S. Miller" <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
[heiko: drop 'default y' for s390]
Acked-by: Ingo Molnar <[email protected]>
Suggested-by: Arnd Bergmann <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2015-11-19 18:19:29 -08:00
commit 21266be9ed
16 changed files with 31 additions and 86 deletions
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1
arch/arm64/Kconfig
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@ -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

14
arch/arm64/Kconfig.debug
View file

@ -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