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net: mount sysfs in a new mount name-space

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The current scheme is racy. It use open_detache_mount in a current
name-space. If a mount namespace is created by someone else between
mount and umount(detach) in open_detache_mount, the mount will be
propagated in the new mntns, then it is detached in a current ns and
rmdir fails, because it's still mounted in athother mntns.

This patch creates a new mount namespace for mounting sysfs.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2013-08-29 17:46:28 +04:00
committed by Pavel Emelyanov
parent 5bf25d36c0
commit cec93fa155
1 changed files with 14 additions and 0 deletions
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14
net.c
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@@ -434,6 +434,20 @@ static int mount_ns_sysfs(void)
BUG_ON(ns_sysfs_fd != -1);
/*
* A new mntns is required to avoid the race between
* open_detach_mount and creating mntns.
*/
if (unshare(CLONE_NEWNS)) {
pr_perror("Can't create new mount namespace");
return -1;
}
if (mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL)) {
pr_perror("Can't mark the root mount as private");
return -1;
}
if (mkdtemp(sys_mount) == NULL) {
pr_perror("mkdtemp failed %s", sys_mount);
return -1;