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Commit 79f7865d authored by Kees Cook's avatar Kees Cook
Browse files

LSM: Introduce "lsm=" for boottime LSM selection 



Provide a way to explicitly choose LSM initialization order via the new
"lsm=" comma-separated list of LSMs.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 13e735c0

Documentation/admin-guide/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -2319,6 +2319,10 @@ 


	lsm.debug	[SECURITY] Enable LSM initialization debugging output.



	lsm=lsm1,...,lsmN

			[SECURITY] Choose order of LSM initialization. This

			overrides CONFIG_LSM.



	machvec=	[IA-64] Force the use of a particular machine-vector

			(machvec) in a generic kernel.

			Example: machvec=hpzx1_swiotlb

security/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -281,7 +281,8 @@ config LSM 
	default "integrity"

	help

	  A comma-separated list of LSMs, in initialization order.

	  Any LSMs left off this list will be ignored.

	  Any LSMs left off this list will be ignored. This can be

	  controlled at boot with the "lsm=" parameter.



	  If unsure, leave this as the default.

security/security.c

+13 −1
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ char *lsm_names; 
/* Boot-time LSM user choice */

static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =

	CONFIG_DEFAULT_SECURITY;

static __initdata const char *chosen_lsm_order;



static __initconst const char * const builtin_lsm_order = CONFIG_LSM;
@@ -190,6 +191,9 @@ static void __init ordered_lsm_init(void) 
	ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),

				GFP_KERNEL);



	if (chosen_lsm_order)

		ordered_lsm_parse(chosen_lsm_order, "cmdline");

	else

		ordered_lsm_parse(builtin_lsm_order, "builtin");



	for (lsm = ordered_lsms; *lsm; lsm++)
@@ -252,6 +256,14 @@ static int __init choose_lsm(char *str) 
}

__setup("security=", choose_lsm);



/* Explicitly choose LSM initialization order. */

static int __init choose_lsm_order(char *str)

{

	chosen_lsm_order = str;

	return 1;

}

__setup("lsm=", choose_lsm_order);



/* Enable LSM order debugging. */

static int __init enable_debug(char *str)

{