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-rw-r--r--security/landlock/syscalls.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/security/landlock/syscalls.c b/security/landlock/syscalls.c
index 2ca0ccbd9..d0cb3d0cb 100644
--- a/security/landlock/syscalls.c
+++ b/security/landlock/syscalls.c
@@ -32,6 +32,18 @@
#include "ruleset.h"
#include "setup.h"
+static bool is_initialized(void)
+{
+ if (likely(landlock_initialized))
+ return true;
+
+ pr_warn_once(
+ "Disabled but requested by user space. "
+ "You should enable Landlock at boot time: "
+ "https://docs.kernel.org/userspace-api/landlock.html#boot-time-configuration\n");
+ return false;
+}
+
/**
* copy_min_struct_from_user - Safe future-proof argument copying
*
@@ -165,7 +177,7 @@ SYSCALL_DEFINE3(landlock_create_ruleset,
/* Build-time checks. */
build_check_abi();
- if (!landlock_initialized)
+ if (!is_initialized())
return -EOPNOTSUPP;
if (flags) {
@@ -311,7 +323,7 @@ SYSCALL_DEFINE4(landlock_add_rule, const int, ruleset_fd,
struct landlock_ruleset *ruleset;
int res, err;
- if (!landlock_initialized)
+ if (!is_initialized())
return -EOPNOTSUPP;
/* No flag for now. */
@@ -402,7 +414,7 @@ SYSCALL_DEFINE2(landlock_restrict_self, const int, ruleset_fd, const __u32,
struct landlock_cred_security *new_llcred;
int err;
- if (!landlock_initialized)
+ if (!is_initialized())
return -EOPNOTSUPP;
/*