rename(), rmdir(), and undelete() fail with EPERM if the last component

of the path is "..".

MFC after:	3 days

3 files changed, 9 insertions, 0 deletions

diff --git a/lib/libc/sys/rename.2 b/lib/libc/sys/rename.2
index 0080f40..6df3046 100644
--- a/lib/libc/sys/rename.2
+++ b/lib/libc/sys/rename.2
@@ -145,6 +145,9 @@ is marked sticky,
 and neither the containing directory nor
 .Fa to
 are owned by the effective user ID.
+.It Bq Er EPERM
+After expanding any symbolic links, the last component of either path is
+.Ql .. .
 .It Bq Er ELOOP
 Too many symbolic links were encountered in translating either pathname.
 .It Bq Er ENOTDIR
diff --git a/lib/libc/sys/rmdir.2 b/lib/libc/sys/rmdir.2
index c2014fc..187b977 100644
--- a/lib/libc/sys/rmdir.2
+++ b/lib/libc/sys/rmdir.2
@@ -85,6 +85,9 @@ to be removed.
 The directory containing the directory to be removed is marked sticky,
 and neither the containing directory nor the directory to be removed
 are owned by the effective user ID.
+.It Bq Er EPERM
+After expanding any symbolic links, the last component of the path is
+.Ql .. .
 .It Bq Er EBUSY
 The directory to be removed is the mount point
 for a mounted file system.
diff --git a/lib/libc/sys/undelete.2 b/lib/libc/sys/undelete.2
index 5faf50a..3f84424 100644
--- a/lib/libc/sys/undelete.2
+++ b/lib/libc/sys/undelete.2
@@ -86,6 +86,9 @@ Too many symbolic links were encountered in translating the pathname.
 .It Bq Er EPERM
 The directory containing the name is marked sticky,
 and the containing directory is not owned by the effective user ID.
+.It Bq Er EPERM
+After expanding any symbolic links, the last component of the path is
+.Ql .. .
 .It Bq Er EIO
 An I/O error occurred while updating the directory entry.
 .It Bq Er EROFS