Booting with "lsm.debug" will report future details on how LSM ordering
decisions are being made.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
Reviewed-by: John Johansen <john.johansen@xxxxxxxxxxxxx>
---
.../admin-guide/kernel-parameters.txt | 2 ++
security/security.c | 18 ++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9871e649ffef..32d323ee9218 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2274,6 +2274,8 @@
ltpc= [NET]
Format: <io>,<irq>,<dma>
+ lsm.debug [SECURITY] Enable LSM initialization debugging output.
+
machvec= [IA-64] Force the use of a particular machine-vector
(machvec) in a generic kernel.
Example: machvec=hpzx1_swiotlb
diff --git a/security/security.c b/security/security.c
index e74f46fba591..395f804f6a91 100644
--- a/security/security.c
+++ b/security/security.c
@@ -12,6 +12,8 @@
* (at your option) any later version.
*/
+#define pr_fmt(fmt) "LSM: " fmt
+
#include <linux/bpf.h>
#include <linux/capability.h>
#include <linux/dcache.h>
@@ -43,11 +45,19 @@ char *lsm_names;
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY;
+static __initdata bool debug;
+#define init_debug(...) \
+ do { \
+ if (debug) \
+ pr_info(__VA_ARGS__); \
+ } while (0)
+
static void __init major_lsm_init(void)
{
struct lsm_info *lsm;
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+ init_debug("initializing %s\n", lsm->name);
lsm->init();
}
}
@@ -91,6 +101,14 @@ static int __init choose_lsm(char *str)
}
__setup("security=", choose_lsm);
+/* Enable LSM order debugging. */
+static int __init enable_debug(char *str)
+{
+ debug = true;
+ return 1;
+}
+__setup("lsm.debug", enable_debug);
+
static bool match_last_lsm(const char *list, const char *lsm)
{
const char *last;
--
2.17.1
