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Subject[PATCH security-next v5 18/30] LSM: Introduce "lsm=" for boottime LSM selection
Date
Provide a way to explicitly choose LSM initialization order via the new
"lsm=" comma-separated list of LSMs.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
Documentation/admin-guide/kernel-parameters.txt | 4 ++++
security/Kconfig | 3 ++-
security/security.c | 14 +++++++++++++-
3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 32d323ee9218..d6389ab66f49 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2276,6 +2276,10 @@

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
diff --git a/security/Kconfig b/security/Kconfig
index 005634f7c4bb..0aa82c1c928e 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -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.

diff --git a/security/security.c b/security/security.c
index 1c4889bce917..70cb2d0004e9 100644
--- a/security/security.c
+++ b/security/security.c
@@ -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;

@@ -190,7 +191,10 @@ static void __init ordered_lsm_init(void)
ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
GFP_KERNEL);

- ordered_lsm_parse(builtin_lsm_order, "builtin");
+ 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++)
maybe_initialize_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)
{
--
2.17.1
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