Only restrict the user from doing something like "mount /mnt /mnt"

for file system types that actually cause a panic (ufs, msdos, cd9660).
This makes /proc mountable again.

1 files changed, 7 insertions, 4 deletions

diff --git a/sbin/mount/mount.c b/sbin/mount/mount.c
index 075ffcf..d5de560 100644
--- a/sbin/mount/mount.c
+++ b/sbin/mount/mount.c
@@ -286,10 +286,13 @@ mountfs(vfstype, spec, name, flags, options, mntopts)
 		warn("%s", specpath);
 		return (1);
 	}
-	if (strcmp(mntpath, specpath) == 0) {
-		warnx("%s: Special device file and mount point may not be the same",
-		    specpath);
-		return (1);
+	if (strcmp(vfstype, "ufs") == 0 || strcmp(vfstype, "msdos") == 0 ||
+	    strcmp(vfstype, "cd9660") == 0) {
+		if (strcmp(mntpath, specpath) == 0) {
+			warnx("%s: Special device file and mount point may not be the same",
+		    	    specpath);
+			return (1);
+		}
 	}
 
 	if (mntopts == NULL)