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Linux/arch/arm64/Kconfig.debug

  1 menu "Kernel hacking"
  2 
  3 source "lib/Kconfig.debug"
  4 
  5 config ARM64_PTDUMP
  6         bool "Export kernel pagetable layout to userspace via debugfs"
  7         depends on DEBUG_KERNEL
  8         select DEBUG_FS
  9         help
 10           Say Y here if you want to show the kernel pagetable layout in a
 11           debugfs file. This information is only useful for kernel developers
 12           who are working in architecture specific areas of the kernel.
 13           It is probably not a good idea to enable this feature in a production
 14           kernel.
 15           If in doubt, say "N"
 16 
 17 config STRICT_DEVMEM
 18         bool "Filter access to /dev/mem"
 19         depends on MMU
 20         help
 21           If this option is disabled, you allow userspace (root) access to all
 22           of memory, including kernel and userspace memory. Accidental
 23           access to this is obviously disastrous, but specific access can
 24           be used by people debugging the kernel.
 25 
 26           If this option is switched on, the /dev/mem file only allows
 27           userspace access to memory mapped peripherals.
 28 
 29           If in doubt, say Y.
 30 
 31 config PID_IN_CONTEXTIDR
 32         bool "Write the current PID to the CONTEXTIDR register"
 33         help
 34           Enabling this option causes the kernel to write the current PID to
 35           the CONTEXTIDR register, at the expense of some additional
 36           instructions during context switch. Say Y here only if you are
 37           planning to use hardware trace tools with this kernel.
 38 
 39 config ARM64_RANDOMIZE_TEXT_OFFSET
 40         bool "Randomize TEXT_OFFSET at build time"
 41         help
 42           Say Y here if you want the image load offset (AKA TEXT_OFFSET)
 43           of the kernel to be randomized at build-time. When selected,
 44           this option will cause TEXT_OFFSET to be randomized upon any
 45           build of the kernel, and the offset will be reflected in the
 46           text_offset field of the resulting Image. This can be used to
 47           fuzz-test bootloaders which respect text_offset.
 48 
 49           This option is intended for bootloader and/or kernel testing
 50           only. Bootloaders must make no assumptions regarding the value
 51           of TEXT_OFFSET and platforms must not require a specific
 52           value.
 53 
 54 config DEBUG_SET_MODULE_RONX
 55         bool "Set loadable kernel module data as NX and text as RO"
 56         depends on MODULES
 57         help
 58           This option helps catch unintended modifications to loadable
 59           kernel module's text and read-only data. It also prevents execution
 60           of module data. Such protection may interfere with run-time code
 61           patching and dynamic kernel tracing - and they might also protect
 62           against certain classes of kernel exploits.
 63           If in doubt, say "N".
 64 
 65 config DEBUG_RODATA
 66         bool "Make kernel text and rodata read-only"
 67         help
 68           If this is set, kernel text and rodata will be made read-only. This
 69           is to help catch accidental or malicious attempts to change the
 70           kernel's executable code. Additionally splits rodata from kernel
 71           text so it can be made explicitly non-executable.
 72 
 73           If in doubt, say Y
 74 
 75 config DEBUG_ALIGN_RODATA
 76         depends on DEBUG_RODATA && ARM64_4K_PAGES
 77         bool "Align linker sections up to SECTION_SIZE"
 78         help
 79           If this option is enabled, sections that may potentially be marked as
 80           read only or non-executable will be aligned up to the section size of
 81           the kernel. This prevents sections from being split into pages and
 82           avoids a potential TLB penalty. The downside is an increase in
 83           alignment and potentially wasted space. Turn on this option if
 84           performance is more important than memory pressure.
 85 
 86           If in doubt, say N
 87 
 88 source "drivers/hwtracing/coresight/Kconfig"
 89 
 90 endmenu

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