Merge: scsi: target: Fix SELinux error when systemd-modules loads the target module

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/4035

# Merge Request Required Information

Fix a SELinux error when loading the LIO target module

JIRA: https://issues.redhat.com/browse/RHEL-21327

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>

## Summary of Changes


## Approved Development Ticket
All submissions to CentOS Stream must reference an approved ticket in [Red Hat Jira](https://issues.redhat.com/). Please follow the CentOS Stream [contribution documentation](https://docs.centos.org/en-US/stream-contrib/quickstart/) for how to file this ticket and have it approved.

Approved-by: Ming Lei <ming.lei@redhat.com>
Approved-by: Ewan D. Milne <emilne@redhat.com>
Approved-by: John Meneghini <jmeneghi@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

drivers/target/target_core_configfs.c

@@ -3672,6 +3672,8 @@ static int __init target_core_init_configfs(void)
 {
 	struct configfs_subsystem *subsys = &target_core_fabrics;
 	struct t10_alua_lu_gp *lu_gp;
+	struct cred *kern_cred;
+	const struct cred *old_cred;
 	int ret;
 
 	pr_debug("TARGET_CORE[0]: Loading Generic Kernel Storage"
@@ -3748,11 +3750,21 @@ static int __init target_core_init_configfs(void)
 	if (ret < 0)
 		goto out;
 
+	/* We use the kernel credentials to access the target directory */
+	kern_cred = prepare_kernel_cred(&init_task);
+	if (!kern_cred) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	old_cred = override_creds(kern_cred);
 	target_init_dbroot();
+	revert_creds(old_cred);
+	put_cred(kern_cred);
 
 	return 0;
 
 out:
+	target_xcopy_release_pt();
 	configfs_unregister_subsystem(subsys);
 	core_dev_release_virtual_lun0();
 	rd_module_exit();