[PATCH 5/7] Smack: hooks for secctx_to_lsmprop and update_lsmprop

[Casey Schaufler <casey@schaufler-ca.com>]

Implement these hooks.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/smack/smack_lsm.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index ff115068c5c0..fcfadd5d9994 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4909,6 +4909,37 @@ static int smack_lsmprop_to_secctx(struct lsm_prop *prop,
 	return smack_to_secctx(prop->smack.skp, cp);
 }
 
+/**
+ * smack_secctx_to_lsmprop - add the smack label to an lsmprop
+ * @secdata: smack label
+ * @seclen: how long label is
+ * @prop: where to put the result
+ *
+ * Exists for audit and networking code.
+ */
+static int smack_secctx_to_lsmprop(const char *secdata, u32 seclen,
+				   struct lsm_prop *prop)
+{
+	prop->smack.skp = smk_find_entry(secdata);
+
+	return 0;
+}
+
+/**
+ * smack_update_lsmprop - set the smack label in an lsmprop
+ * @dest: destination properties
+ * @src: source properties
+ * @lsmid: which LSM is relevant.
+ *
+ * Set the Smack entry in the @dest if appropriate.
+ */
+static void smack_update_lsmprop(struct lsm_prop *dest, struct lsm_prop *src,
+				 int lsmid)
+{
+	if (lsmid == LSM_ID_SMACK || lsmid == LSM_ID_UNDEF)
+		dest->smack.skp = src->smack.skp;
+}
+
 /**
  * smack_secctx_to_secid - return the secid for a smack label
  * @secdata: smack label
@@ -5269,6 +5300,8 @@ static struct security_hook_list smack_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx),
 	LSM_HOOK_INIT(lsmprop_to_secctx, smack_lsmprop_to_secctx),
 	LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid),
+	LSM_HOOK_INIT(secctx_to_lsmprop, smack_secctx_to_lsmprop),
+	LSM_HOOK_INIT(update_lsmprop, smack_update_lsmprop),
 	LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx),
 	LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx),
 	LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx),
-- 
2.54.0