From a39e880f67ef8e6406b3e81291dcbeeb185d57d0 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Fri, 26 Jul 2019 23:22:59 +0200
Subject: [PATCH] pivot_root.2: 'put_old' can't be a mount point with MS_SHARED
 propagation

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/pivot_root.2 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man2/pivot_root.2 b/man2/pivot_root.2
index a882bb2a1..e1a5b927f 100644
--- a/man2/pivot_root.2
+++ b/man2/pivot_root.2
@@ -100,6 +100,10 @@ on top of itself.)
 The propagation type of
 .I new_root
 and its parent mount must not be
+.BR MS_SHARED ;
+similarly, if
+.I put_old
+is an existing mount point, its propagation type must not be
 .BR MS_SHARED .
 .SH RETURN VALUE
 On success, zero is returned.
@@ -132,6 +136,11 @@ or the parent mount of that mount point,
 has propagation type
 .BR MS_SHARED .
 .TP
+.B EINVAL
+.I put_old
+is a mount point and has the propagation type
+.BR MS_SHARED .
+.TP
 .B ENOTDIR
 \fInew_root\fP or \fIput_old\fP is not a directory.
 .TP