selinux: fix mounting of cgroup2 under older policies

commit 901ef845fa2469c ("selinux: allow per-file labeling for cgroupfs")
broke mounting of cgroup2 under older SELinux policies which lacked
a genfscon rule for cgroup2.  This prevents mounting of cgroup2 even
when SELinux is permissive.

Change the handling when there is no genfscon rule in policy to
just mark the inode unlabeled and not return an error to the caller.
This permits mounting and access if allowed by policy, e.g. to
unconfined domains.

I also considered changing the behavior of security_genfs_sid() to
never return -ENOENT, but the current behavior is relied upon by
other callers to perform caller-specific handling.

Fixes: 901ef845fa2469c ("selinux: allow per-file labeling for cgroupfs")
CC: <stable@vger.kernel.org>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reported-by: Waiman Long <longman@redhat.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Tested-by: Waiman Long <longman@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ad9a9b8e997941640b6de40fd9af4a1b17f39d04..18b98b5e1e3c46d1256ad1ffacff6ebc711beed3 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1508,6 +1508,11 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
                }
                rc = security_genfs_sid(&selinux_state, sb->s_type->name,
                                        path, tclass, sid);
+               if (rc == -ENOENT) {
+                       /* No match in policy, mark as unlabeled. */
+                       *sid = SECINITSID_UNLABELED;
+                       rc = 0;
+               }
        }
        free_page((unsigned long)buffer);
        return rc;