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authorCasey Schaufler <casey@schaufler-ca.com>2017-01-18 17:09:05 -0800
committerJames Morris <james.l.morris@oracle.com>2017-01-19 13:18:29 +1100
commitd69dece5f5b6bc7a5e39d2b6136ddc69469331fe (patch)
treeb4c23177baf246a1f64b83442fc3359cbc0d8f38 /security/security.c
parent3ccb76c5dfe0d25c1d0168d5b726d0b43d19a485 (diff)
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LSM: Add /sys/kernel/security/lsm
I am still tired of having to find indirect ways to determine what security modules are active on a system. I have added /sys/kernel/security/lsm, which contains a comma separated list of the active security modules. No more groping around in /proc/filesystems or other clever hacks. Unchanged from previous versions except for being updated to the latest security next branch. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'security/security.c')
-rw-r--r--security/security.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index f825304f04a7..f0a802ee29b6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -32,6 +32,7 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
+char *lsm_names;
/* Boot-time LSM user choice */
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY;
@@ -78,6 +79,22 @@ static int __init choose_lsm(char *str)
}
__setup("security=", choose_lsm);
+static int lsm_append(char *new, char **result)
+{
+ char *cp;
+
+ if (*result == NULL) {
+ *result = kstrdup(new, GFP_KERNEL);
+ } else {
+ cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
+ if (cp == NULL)
+ return -ENOMEM;
+ kfree(*result);
+ *result = cp;
+ }
+ return 0;
+}
+
/**
* security_module_enable - Load given security module on boot ?
* @module: the name of the module
@@ -97,6 +114,27 @@ int __init security_module_enable(const char *module)
return !strcmp(module, chosen_lsm);
}
+/**
+ * security_add_hooks - Add a modules hooks to the hook lists.
+ * @hooks: the hooks to add
+ * @count: the number of hooks to add
+ * @lsm: the name of the security module
+ *
+ * Each LSM has to register its hooks with the infrastructure.
+ */
+void __init security_add_hooks(struct security_hook_list *hooks, int count,
+ char *lsm)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ hooks[i].lsm = lsm;
+ list_add_tail_rcu(&hooks[i].list, hooks[i].head);
+ }
+ if (lsm_append(lsm, &lsm_names) < 0)
+ panic("%s - Cannot get early memory.\n", __func__);
+}
+
/*
* Hook list operation macros.
*