forked from Minki/linux
c9465b4ec3
In a similar manner to arm, it's useful to be able to dump the page tables to verify permissions and memory types. Add a debugfs file to check the page tables. Acked-by: Steve Capper <steve.capper@linaro.org> Tested-by: Steve Capper <steve.capper@linaro.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> [will: s/BUFFERABLE/NORMAL-NC/] Signed-off-by: Will Deacon <will.deacon@arm.com>
70 lines
2.5 KiB
Plaintext
70 lines
2.5 KiB
Plaintext
menu "Kernel hacking"
|
|
|
|
source "lib/Kconfig.debug"
|
|
|
|
config FRAME_POINTER
|
|
bool
|
|
default y
|
|
|
|
config ARM64_PTDUMP
|
|
bool "Export kernel pagetable layout to userspace via debugfs"
|
|
depends on DEBUG_KERNEL
|
|
select DEBUG_FS
|
|
help
|
|
Say Y here if you want to show the kernel pagetable layout in a
|
|
debugfs file. This information is only useful for kernel developers
|
|
who are working in architecture specific areas of the kernel.
|
|
It is probably not a good idea to enable this feature in a production
|
|
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
|
|
Enabling this option causes the kernel to write the current PID to
|
|
the CONTEXTIDR register, at the expense of some additional
|
|
instructions during context switch. Say Y here only if you are
|
|
planning to use hardware trace tools with this kernel.
|
|
|
|
config ARM64_RANDOMIZE_TEXT_OFFSET
|
|
bool "Randomize TEXT_OFFSET at build time"
|
|
help
|
|
Say Y here if you want the image load offset (AKA TEXT_OFFSET)
|
|
of the kernel to be randomized at build-time. When selected,
|
|
this option will cause TEXT_OFFSET to be randomized upon any
|
|
build of the kernel, and the offset will be reflected in the
|
|
text_offset field of the resulting Image. This can be used to
|
|
fuzz-test bootloaders which respect text_offset.
|
|
|
|
This option is intended for bootloader and/or kernel testing
|
|
only. Bootloaders must make no assumptions regarding the value
|
|
of TEXT_OFFSET and platforms must not require a specific
|
|
value.
|
|
|
|
config DEBUG_SET_MODULE_RONX
|
|
bool "Set loadable kernel module data as NX and text as RO"
|
|
depends on MODULES
|
|
help
|
|
This option helps catch unintended modifications to loadable
|
|
kernel module's text and read-only data. It also prevents execution
|
|
of module data. Such protection may interfere with run-time code
|
|
patching and dynamic kernel tracing - and they might also protect
|
|
against certain classes of kernel exploits.
|
|
If in doubt, say "N".
|
|
|
|
endmenu
|