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MFV r316873: 7233 dir_is_empty should open directory with CLOEXEC

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illumos/illumos-gate@d420209d9c
d420209d9c

https://www.illumos.org/issues/7233
  This fixes a race where one thread is executing zfs_mount() while another
  thread forks and execs. If the fork occurs while the directory is open, the
  child process will inherit (but not necessarily close immediately) the open fd
  for the directory, preventing the mount.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author: Alex Reece <alex@delphix.com>
This commit is contained in:
Alexander Motin 2018-02-20 20:17:19 +00:00
commit c2e79753fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329659
1 changed files with 10 additions and 2 deletions
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12
cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c
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@ -22,7 +22,7 @@
/*
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014 by Delphix. All rights reserved.
* Copyright (c) 2014, 2015 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
* Copyright 2017 Joyent, Inc.
* Copyright 2017 RackTop Systems.
@ -67,6 +67,7 @@
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <libintl.h>
#include <stdio.h>
@ -187,9 +188,16 @@ dir_is_empty(const char *dirname)
{
DIR *dirp;
struct dirent64 *dp;
int dirfd;
if ((dirp = opendir(dirname)) == NULL)
if ((dirfd = openat(AT_FDCWD, dirname,
O_RDONLY | O_NDELAY | O_LARGEFILE | O_CLOEXEC, 0)) < 0) {
return (B_TRUE);
}
if ((dirp = fdopendir(dirfd)) == NULL) {
return (B_TRUE);
}
while ((dp = readdir64(dirp)) != NULL) {