![Yang Shi](/assets/img/avatar_default.png)
FRAME_POINTER is defined in lib/Kconfig.debug, it is unnecessary to redefine it in arch/arm64/Kconfig.debug. ARM64 depends on frame pointer to get correct stack trace (also selecting ARCH_WANT_FRAME_POINTERS). However, the lib/Kconfig.debug definition allows such option to be disabled. This patch forces FRAME_POINTER always on on arm64. Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
91 lines
3.4 KiB
Plaintext
91 lines
3.4 KiB
Plaintext
menu "Kernel hacking"
|
|
|
|
source "lib/Kconfig.debug"
|
|
|
|
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".
|
|
|
|
config DEBUG_RODATA
|
|
bool "Make kernel text and rodata read-only"
|
|
help
|
|
If this is set, kernel text and rodata will be made read-only. This
|
|
is to help catch accidental or malicious attempts to change the
|
|
kernel's executable code. Additionally splits rodata from kernel
|
|
text so it can be made explicitly non-executable.
|
|
|
|
If in doubt, say Y
|
|
|
|
config DEBUG_ALIGN_RODATA
|
|
depends on DEBUG_RODATA && ARM64_4K_PAGES
|
|
bool "Align linker sections up to SECTION_SIZE"
|
|
help
|
|
If this option is enabled, sections that may potentially be marked as
|
|
read only or non-executable will be aligned up to the section size of
|
|
the kernel. This prevents sections from being split into pages and
|
|
avoids a potential TLB penalty. The downside is an increase in
|
|
alignment and potentially wasted space. Turn on this option if
|
|
performance is more important than memory pressure.
|
|
|
|
If in doubt, say N
|
|
|
|
source "drivers/hwtracing/coresight/Kconfig"
|
|
|
|
endmenu
|