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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 
 16           If in doubt, say N.
 17 
 18 config PID_IN_CONTEXTIDR
 19         bool "Write the current PID to the CONTEXTIDR register"
 20         help
 21           Enabling this option causes the kernel to write the current PID to
 22           the CONTEXTIDR register, at the expense of some additional
 23           instructions during context switch. Say Y here only if you are
 24           planning to use hardware trace tools with this kernel.
 25 
 26 config ARM64_RANDOMIZE_TEXT_OFFSET
 27         bool "Randomize TEXT_OFFSET at build time"
 28         help
 29           Say Y here if you want the image load offset (AKA TEXT_OFFSET)
 30           of the kernel to be randomized at build-time. When selected,
 31           this option will cause TEXT_OFFSET to be randomized upon any
 32           build of the kernel, and the offset will be reflected in the
 33           text_offset field of the resulting Image. This can be used to
 34           fuzz-test bootloaders which respect text_offset.
 35 
 36           This option is intended for bootloader and/or kernel testing
 37           only. Bootloaders must make no assumptions regarding the value
 38           of TEXT_OFFSET and platforms must not require a specific
 39           value.
 40 
 41 config DEBUG_SET_MODULE_RONX
 42         bool "Set loadable kernel module data as NX and text as RO"
 43         depends on MODULES
 44         default y
 45         help
 46           Is this is set, kernel module text and rodata will be made read-only.
 47           This is to help catch accidental or malicious attempts to change the
 48           kernel's executable code.
 49 
 50           If in doubt, say Y.
 51 
 52 config DEBUG_RODATA
 53         bool "Make kernel text and rodata read-only"
 54         default y
 55         help
 56           If this is set, kernel text and rodata will be made read-only. This
 57           is to help catch accidental or malicious attempts to change the
 58           kernel's executable code.
 59 
 60           If in doubt, say Y.
 61 
 62 config DEBUG_ALIGN_RODATA
 63         depends on DEBUG_RODATA
 64         bool "Align linker sections up to SECTION_SIZE"
 65         help
 66           If this option is enabled, sections that may potentially be marked as
 67           read only or non-executable will be aligned up to the section size of
 68           the kernel. This prevents sections from being split into pages and
 69           avoids a potential TLB penalty. The downside is an increase in
 70           alignment and potentially wasted space. Turn on this option if
 71           performance is more important than memory pressure.
 72 
 73           If in doubt, say N.
 74 
 75 source "drivers/hwtracing/coresight/Kconfig"
 76 
 77 endmenu

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