Merge tag 'v5.7-rc1' into locking/kcsan, to resolve conflicts and refresh

Resolve these conflicts:

	arch/x86/Kconfig
	arch/x86/kernel/Makefile

Do a minor "evil merge" to move the KCSAN entry up a bit by a few lines
in the Kconfig to reduce the probability of future conflicts.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 41 insertions, 8 deletions

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 0e04fcb3ab3d..48469c95d78e 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -2,18 +2,50 @@
 config ARCH_HAS_UBSAN_SANITIZE_ALL
 	bool
 
-config UBSAN
+menuconfig UBSAN
 	bool "Undefined behaviour sanity checker"
 	help
-	  This option enables undefined behaviour sanity checker
+	  This option enables the Undefined Behaviour sanity checker.
 	  Compile-time instrumentation is used to detect various undefined
-	  behaviours in runtime. Various types of checks may be enabled
-	  via boot parameter ubsan_handle
-	  (see: Documentation/dev-tools/ubsan.rst).
+	  behaviours at runtime. For more details, see:
+	  Documentation/dev-tools/ubsan.rst
+
+if UBSAN
+
+config UBSAN_TRAP
+	bool "On Sanitizer warnings, abort the running kernel code"
+	depends on $(cc-option, -fsanitize-undefined-trap-on-error)
+	help
+	  Building kernels with Sanitizer features enabled tends to grow
+	  the kernel size by around 5%, due to adding all the debugging
+	  text on failure paths. To avoid this, Sanitizer instrumentation
+	  can just issue a trap. This reduces the kernel size overhead but
+	  turns all warnings (including potentially harmless conditions)
+	  into full exceptions that abort the running kernel code
+	  (regardless of context, locks held, etc), which may destabilize
+	  the system. For some system builders this is an acceptable
+	  trade-off.
+
+config UBSAN_BOUNDS
+	bool "Perform array index bounds checking"
+	default UBSAN
+	help
+	  This option enables detection of directly indexed out of bounds
+	  array accesses, where the array size is known at compile time.
+	  Note that this does not protect array overflows via bad calls
+	  to the {str,mem}*cpy() family of functions (that is addressed
+	  by CONFIG_FORTIFY_SOURCE).
+
+config UBSAN_MISC
+	bool "Enable all other Undefined Behavior sanity checks"
+	default UBSAN
+	help
+	  This option enables all sanity checks that don't have their
+	  own Kconfig options. Disable this if you only want to have
+	  individually selected checks.
 
 config UBSAN_SANITIZE_ALL
 	bool "Enable instrumentation for the entire kernel"
-	depends on UBSAN
 	depends on ARCH_HAS_UBSAN_SANITIZE_ALL
 
 	# We build with -Wno-maybe-uninitilzed, but we still want to
@@ -30,7 +62,6 @@ config UBSAN_SANITIZE_ALL
 
 config UBSAN_NO_ALIGNMENT
 	bool "Disable checking of pointers alignment"
-	depends on UBSAN
 	default y if HAVE_EFFICIENT_UNALIGNED_ACCESS
 	help
 	  This option disables the check of unaligned memory accesses.
@@ -43,7 +74,9 @@ config UBSAN_ALIGNMENT
 
 config TEST_UBSAN
 	tristate "Module for testing for undefined behavior detection"
-	depends on m && UBSAN
+	depends on m
 	help
 	  This is a test module for UBSAN.
 	  It triggers various undefined behavior, and detect it.
+
+endif	# if UBSAN