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1 # SPDX-License-Identifier: GPL-2.0-only
7 	def_bool $(cc-option,-ftrivial-auto-var-init=pattern)
10 	def_bool $(cc-option,-ftrivial-auto-var-init=zero)
13 	# Clang 16 and later warn about using the -enable flag, but it
15 	def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang)
47 		bool "pattern-init everything (strongest)"
55 		  having been left uninitialized.
59 		  non-NULL values, buffer sizes and indices are very big. The
60 		  pattern is situation-specific; Clang on 64-bit uses 0xAA
62 		  which use 0xFF repeating (-NaN). Clang on 32-bit uses 0xFF
67 		bool "zero-init everything (strongest and safest)"
75 		  about having been left uninitialized.
78 		  (immediately NUL-terminated), pointers (NULL), indices
86 	def_bool $(cc-option,-fsanitize-coverage-stack-depth-callback-min=1)
100 	  most uninitialized stack variable attacks, with the performance
169 	  workload, but most cases see <1% impact. Some synthetic
187 	  touching "cold" memory areas. Most cases see 3-5% impact. Some
191 	def_bool $(cc-option,-fzero-call-used-regs=used-gpr)
193 	# https://github.com/llvm/llvm-project/issues/59242
200 	  At the end of functions, always zero any caller-used register
206 	  generated "write-what-where" gadgets) in the resulting kernel
207 	  image. This has a less than 1% performance impact on most
219 	# https://github.com/llvm/llvm-project/issues/53645
252 	  Minimal integrity checking in the linked-list manipulation routines
281 	def_bool $(cc-option,-frandomize-layout-seed-file=/dev/null)
283 	# Clang 16 due to https://github.com/llvm/llvm-project/issues/60349
294 	  marked with __randomize_layout, will be randomized at compile-time.
332 		bool "Limit randomization of structure layout to cache-lines"
337 		  best effort at restricting randomization to cacheline-sized