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authorKees Cook <keescook@chromium.org>2018-10-10 17:18:25 -0700
committerJames Morris <james.morris@microsoft.com>2018-10-10 20:40:22 -0700
commit9b8c7c14059af801637a818882159145c370d6f1 (patch)
tree4a24ecf885e60add9de71c928ed15ad79f8f0165 /security
parent07aed2f2af5a5892ced035dbcf3993f630825fc3 (diff)
LSM: Provide init debugging infrastructure
Booting with "lsm.debug" will report future details on how LSM ordering decisions are being made. Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: John Johansen <john.johansen@canonical.com> Reviewed-by: James Morris <james.morris@microsoft.com> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security')
-rw-r--r--security/security.c18
1 files changed, 18 insertions, 0 deletions
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;