Lines Matching +full:bit +full:- +full:manipulation
1 # SPDX-License-Identifier: GPL-2.0-only
12 flaws, this plugin is available to identify and zero-initialize
23 def_bool $(cc-option,-ftrivial-auto-var-init=pattern)
26 def_bool $(cc-option,-ftrivial-auto-var-init=zero)
29 # Clang 16 and later warn about using the -enable flag, but it
31 …def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-wi…
64 bool "zero-init structs marked for userspace (weak)"
69 Zero-initialize any structures on the stack containing
72 exposures, like CVE-2013-2141:
76 bool "zero-init structs passed by reference (strong)"
82 Zero-initialize any structures on the stack that may
86 exposures, like CVE-2017-1000410:
89 As a side-effect, this keeps a lot of variables on the
95 bool "zero-init everything passed by reference (very strong)"
101 Zero-initialize any stack variables that may be passed
107 As a side-effect, this keeps a lot of variables on the
113 bool "pattern-init everything (strongest)"
125 non-NULL values, buffer sizes and indices are very big. The
126 pattern is situation-specific; Clang on 64-bit uses 0xAA
128 which use 0xFF repeating (-NaN). Clang on 32-bit uses 0xFF
133 bool "zero-init everything (strongest and safest)"
144 (immediately NUL-terminated), pointers (NULL), indices
256 touching "cold" memory areas. Most cases see 3-5% impact. Some
260 def_bool $(cc-option,-fzero-call-used-regs=used-gpr)
262 # https://github.com/llvm/llvm-project/issues/59242
269 At the end of functions, always zero any caller-used register
275 generated "write-what-where" gadgets) in the resulting kernel
286 bool "Check integrity of linked list manipulation"
288 Minimal integrity checking in the linked-list manipulation routines
307 def_bool $(cc-option,-frandomize-layout-seed-file=/dev/null)
309 # Clang 16 due to https://github.com/llvm/llvm-project/issues/60349
320 marked with __randomize_layout, will be randomized at compile-time.
354 to keep adjacent bitfields together, but with their bit
358 bool "Limit randomization of structure layout to cache-lines"
363 best effort at restricting randomization to cacheline-sized