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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/Kconfig.debug
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@@ -2,7 +2,6 @@
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 config PPC_DISABLE_WERROR
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 	bool "Don't build arch/powerpc code with -Werror"
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-	default n
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 	help
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 	  This option tells the compiler NOT to build the code under
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 	  arch/powerpc with the -Werror flag (which means warnings
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@@ -56,7 +55,6 @@
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 config CODE_PATCHING_SELFTEST
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 	bool "Run self-tests of the code-patching code"
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 	depends on DEBUG_KERNEL
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-	default n
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 config JUMP_LABEL_FEATURE_CHECKS
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 	bool "Enable use of jump label for cpu/mmu_has_feature()"
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@@ -70,7 +68,6 @@
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 config JUMP_LABEL_FEATURE_CHECK_DEBUG
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 	bool "Do extra check on feature fixup calls"
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 	depends on DEBUG_KERNEL && JUMP_LABEL_FEATURE_CHECKS
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-	default n
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 	help
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 	  This tries to catch incorrect usage of cpu_has_feature() and
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 	  mmu_has_feature() in the code.
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@@ -80,16 +77,13 @@
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 config FTR_FIXUP_SELFTEST
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 	bool "Run self-tests of the feature-fixup code"
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 	depends on DEBUG_KERNEL
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-	default n
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 config MSI_BITMAP_SELFTEST
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 	bool "Run self-tests of the MSI bitmap code"
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 	depends on DEBUG_KERNEL
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-	default n
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 config PPC_IRQ_SOFT_MASK_DEBUG
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 	bool "Include extra checks for powerpc irq soft masking"
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-	default n
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 config XMON
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 	bool "Include xmon kernel debugger"
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@@ -122,6 +116,14 @@
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 	  Include support for disassembling in xmon. You probably want
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 	  to say Y here, unless you're building for a memory-constrained
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 	  system.
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+
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+config XMON_DEFAULT_RO_MODE
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+	bool "Restrict xmon to read-only operations by default"
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+	depends on XMON
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+	default y
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+	help
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+	  Operate xmon in read-only mode. The cmdline options 'xmon=rw' and
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+	  'xmon=ro' override this default.
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 config DEBUGGER
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 	bool
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@@ -220,7 +222,7 @@
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 	help
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 	  Select this to enable early debugging for IBM 44x chips via the
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 	  inbuilt serial port.  If you enable this, ensure you set
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-          PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
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+	  PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
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 config PPC_EARLY_DEBUG_40x
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 	bool "Early serial debugging for IBM/AMCC 40x CPUs"
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@@ -228,11 +230,11 @@
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 	help
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 	  Select this to enable early debugging for IBM 40x chips via the
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 	  inbuilt serial port. This works on chips with a 16550 compatible
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-	  UART. Xilinx chips with uartlite cannot use this option.
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+	  UART.
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 config PPC_EARLY_DEBUG_CPM
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 	bool "Early serial debugging for Freescale CPM-based serial ports"
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-	depends on SERIAL_CPM
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+	depends on SERIAL_CPM=y
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 	help
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 	  Select this to enable early debugging for Freescale chips
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 	  using a CPM-based serial port.  This assumes that the bootwrapper
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@@ -323,7 +325,7 @@
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 	default "0x40000200"
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 	help
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 	  You probably want 0x40000200 for ebony boards and
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-          0x40000300 for taishan
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+	  0x40000300 for taishan
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 config PPC_EARLY_DEBUG_44x_PHYSHIGH
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 	hex "EPRN of early debug UART physical address"
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 	  If you are unsure, say N.
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 config PPC_PTDUMP
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-        bool "Export kernel pagetable layout to userspace via debugfs"
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-        depends on DEBUG_KERNEL && DEBUG_FS
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-        help
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+	bool "Export kernel pagetable layout to userspace via debugfs"
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+	depends on DEBUG_KERNEL && DEBUG_FS
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+	help
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 	  This option exports the state of the kernel pagetables to a
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 	  debugfs file. This is only useful for kernel developers who are
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 	  working in architecture specific areas of the kernel - probably
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@@ -368,12 +370,32 @@
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 	  If you are unsure, say N.
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-config PPC_HTDUMP
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-	def_bool y
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-	depends on PPC_PTDUMP && PPC_BOOK3S_64
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+config PPC_DEBUG_WX
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+	bool "Warn on W+X mappings at boot"
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+	depends on PPC_PTDUMP && STRICT_KERNEL_RWX
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+	help
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+	  Generate a warning if any W+X mappings are found at boot.
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+
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+	  This is useful for discovering cases where the kernel is leaving
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+	  W+X mappings after applying NX, as such mappings are a security risk.
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+	  Note that even if the check fails, your kernel is possibly
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+	  still fine, as W+X mappings are not a security hole in
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+	  themselves, what they do is that they make the exploitation
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+	  of other unfixed kernel bugs easier.
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+	  There is no runtime or memory usage effect of this option
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+	  once the kernel has booted up - it's a one time check.
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+	  If in doubt, say "Y".
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 config PPC_FAST_ENDIAN_SWITCH
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 	bool "Deprecated fast endian-switch syscall"
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-        depends on DEBUG_KERNEL && PPC_BOOK3S_64
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-        help
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+	depends on DEBUG_KERNEL && PPC_BOOK3S_64
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+	help
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 	  If you're unsure what this is, say N.
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+
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+config KASAN_SHADOW_OFFSET
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+	hex
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+	depends on KASAN
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+	default 0xe0000000