Commit 24452d9e authored by Kees Cook's avatar Kees Cook Committed by Peter Zijlstra
Browse files

x86/cfi: Document the "cfi=" bootparam options 



The kernel-parameters.txt didn't have a section for the cfi= options.
Add it.

Signed-off-by: default avatarKees Cook <kees@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20250904034656.3670313-3-kees@kernel.org
parent 628a15e0

Documentation/admin-guide/kernel-parameters.txt

+17 −0
Original line number Diff line number Diff line
@@ -608,6 +608,23 @@ 
	ccw_timeout_log	[S390]

			See Documentation/arch/s390/common_io.rst for details.



	cfi=		[X86-64] Set Control Flow Integrity checking features

			when CONFIG_FINEIBT is enabled.

			Format: feature[,feature...]

			Default: auto



			auto:	  Use FineIBT if IBT available, otherwise kCFI.

				  Under FineIBT, enable "paranoid" mode when

				  FRED is not available.

			off:	  Turn off CFI checking.

			kcfi:	  Use kCFI (disable FineIBT).

			fineibt:  Use FineIBT (even if IBT not available).

			norand:   Do not re-randomize CFI hashes.

			paranoid: Add caller hash checking under FineIBT.

			bhi:	  Enable register poisoning to stop speculation

				  across FineIBT. (Disabled by default.)

			warn:	  Do not enforce CFI checking: warn only.



	cgroup_disable=	[KNL] Disable a particular controller or optional feature

			Format: {name of the controller(s) or feature(s) to disable}

			The effects of cgroup_disable=foo are: