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[src/trunk]: src/sys/kern Don't allow MNT_UNION on the root, there is no cove...
details: https://anonhg.NetBSD.org/src/rev/7e69bf284be1
branches: trunk
changeset: 449019:7e69bf284be1
user: mlelstv <mlelstv%NetBSD.org@localhost>
date: Tue Feb 19 06:55:28 2019 +0000
description:
Don't allow MNT_UNION on the root, there is no covered filesystem.
Fixes PR 53850
diffstat:
sys/kern/vfs_syscalls.c | 13 +++++++++++--
1 files changed, 11 insertions(+), 2 deletions(-)
diffs (34 lines):
diff -r 602f08c32c8e -r 7e69bf284be1 sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c Tue Feb 19 05:47:08 2019 +0000
+++ b/sys/kern/vfs_syscalls.c Tue Feb 19 06:55:28 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vfs_syscalls.c,v 1.524 2019/02/05 13:50:10 kamil Exp $ */
+/* $NetBSD: vfs_syscalls.c,v 1.525 2019/02/19 06:55:28 mlelstv Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.524 2019/02/05 13:50:10 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.525 2019/02/19 06:55:28 mlelstv Exp $");
#ifdef _KERNEL_OPT
#include "opt_fileassoc.h"
@@ -278,6 +278,15 @@
goto out;
}
+ /*
+ * Enabling MNT_UNION requires a covered mountpoint and
+ * must not happen on the root mount.
+ */
+ if ((flags & MNT_UNION) != 0 && mp->mnt_vnodecovered == NULLVP) {
+ error = EOPNOTSUPP;
+ goto out;
+ }
+
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data);
if (error)
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