Audit: use new LSM hooks instead of SELinux exports

Stop using the following exported SELinux interfaces:
selinux_get_inode_sid(inode, sid)
selinux_get_ipc_sid(ipcp, sid)
selinux_get_task_sid(tsk, sid)
selinux_sid_to_string(sid, ctx, len)
kfree(ctx)

and use following generic LSM equivalents respectively:
security_inode_getsecid(inode, secid)
security_ipc_getsecid*(ipcp, secid)
security_task_getsecid(tsk, secid)
security_sid_to_secctx(sid, ctx, len)
security_release_secctx(ctx, len)

Call security_release_secctx only if security_secid_to_secctx
succeeded.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Acked-by: James Morris <jmorris@namei.org>
Reviewed-by: Paul Moore <paul.moore@hp.com>

1 files changed, 9 insertions, 8 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index b782b046543d..784a48e9f382 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -265,13 +265,13 @@ static int audit_log_config_change(char *function_name, int new, int old,
                 char *ctx = NULL;
                 u32 len;
 
-                rc = selinux_sid_to_string(sid, &ctx, &len);
+                rc = security_secid_to_secctx(sid, &ctx, &len);
                 if (rc) {
                         audit_log_format(ab, " sid=%u", sid);
                         allow_changes = 0; /* Something weird, deny request */
                 } else {
                         audit_log_format(ab, " subj=%s", ctx);
-                        kfree(ctx);
+                        security_release_secctx(ctx, len);
                 }
         }
         audit_log_format(ab, " res=%d", allow_changes);
@@ -550,12 +550,13 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
         audit_log_format(*ab, "user pid=%d uid=%u auid=%u",
                          pid, uid, auid);
         if (sid) {
-                rc = selinux_sid_to_string(sid, &ctx, &len);
+                rc = security_secid_to_secctx(sid, &ctx, &len);
                 if (rc)
                         audit_log_format(*ab, " ssid=%u", sid);
-                else
+                else {
                         audit_log_format(*ab, " subj=%s", ctx);
-                kfree(ctx);
+                        security_release_secctx(ctx, len);
+                }
         }
 
         return rc;
@@ -758,18 +759,18 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                 break;
         }
         case AUDIT_SIGNAL_INFO:
-                err = selinux_sid_to_string(audit_sig_sid, &ctx, &len);
+                err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
                 if (err)
                         return err;
                 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
                 if (!sig_data) {
-                        kfree(ctx);
+                        security_release_secctx(ctx, len);
                         return -ENOMEM;
                 }
                 sig_data->uid = audit_sig_uid;
                 sig_data->pid = audit_sig_pid;
                 memcpy(sig_data->ctx, ctx, len);
-                kfree(ctx);
+                security_release_secctx(ctx, len);
                 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
                                 0, 0, sig_data, sizeof(*sig_data) + len);
                 kfree(sig_data);