Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
new file mode 100644
index 000000000..69c9170bd
--- /dev/null
+++ b/arch/arm64/Kconfig.debug
@@ -0,0 +1,96 @@
+
+config ARM64_PTDUMP_CORE
+	def_bool n
+
+config ARM64_PTDUMP_DEBUGFS
+	bool "Export kernel pagetable layout to userspace via debugfs"
+	depends on DEBUG_KERNEL
+	select ARM64_PTDUMP_CORE
+	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 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_WX
+	bool "Warn on W+X mappings at boot"
+	select ARM64_PTDUMP_CORE
+	---help---
+	  Generate a warning if any W+X mappings are found at boot.
+
+	  This is useful for discovering cases where the kernel is leaving
+	  W+X mappings after applying NX, as such mappings are a security risk.
+	  This check also includes UXN, which should be set on all kernel
+	  mappings.
+
+	  Look for a message in dmesg output like this:
+
+	    arm64/mm: Checked W+X mappings: passed, no W+X pages found.
+
+	  or like this, if the check failed:
+
+	    arm64/mm: Checked W+X mappings: FAILED, <N> W+X pages found.
+
+	  Note that even if the check fails, your kernel is possibly
+	  still fine, as W+X mappings are not a security hole in
+	  themselves, what they do is that they make the exploitation
+	  of other unfixed kernel bugs easier.
+
+	  There is no runtime or memory usage effect of this option
+	  once the kernel has booted up - it's a one time check.
+
+	  If in doubt, say "Y".
+
+config DEBUG_ALIGN_RODATA
+	depends on STRICT_KERNEL_RWX
+	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.
+
+config DEBUG_EFI
+	depends on EFI && DEBUG_INFO
+	bool "UEFI debugging"
+	help
+	  Enable this option to include EFI specific debugging features into
+	  the kernel that are only useful when using a debug build of the
+	  UEFI firmware
+
+config ARM64_RELOC_TEST
+	depends on m
+	tristate "Relocation testing module"
+
+source "drivers/hwtracing/coresight/Kconfig"