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

[ Upstream commit 97a54ef596c3fd24ec2b227ba8aaf2cf5415e779 ]

If the systemd-modules service loads the target module, the credentials of
that userspace process will be used to validate the access to the target db
directory.  SELinux will prevent it, reporting an error like the following:

kernel: audit: type=1400 audit(1676301082.205:4): avc: denied  { read }
for  pid=1020 comm="systemd-modules" name="target" dev="dm-3"
ino=4657583 scontext=system_u:system_r:systemd_modules_load_t:s0
tcontext=system_u:object_r:targetd_etc_rw_t:s0 tclass=dir permissive=0

Fix the error by using the kernel credentials to access the db directory

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Link: https://lore.kernel.org/r/20240215143944.847184-2-mlombard@redhat.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 56ae882fb7b39c930f71ce689165e0f0f2bf5fb5..4d2fbe1429b69e513bf0f61a2bdb802d7f5fdf68 100644 (file)
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -3532,6 +3532,8 @@ 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"
@@ -3608,11 +3610,21 @@ 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();