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* shadow/lckpwdf.c (__lckpwdf): Use O_CLOEXEC if possible.

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This commit is contained in:
Ulrich Drepper 2007-08-11 02:56:12 +00:00
parent d7e23b02a4
commit 7cf89e9599
2 changed files with 33 additions and 11 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
2007-08-10 Ulrich Drepper <drepper@redhat.com>
* shadow/lckpwdf.c (__lckpwdf): Use O_CLOEXEC if possible.
* nscd/connections.c: Use O_CLOEXEC is possible. Use mkostemp
instead of mkstemp.

42
shadow/lckpwdf.c
View File

@ -1,5 +1,5 @@
/* Handle locking of password file.
Copyright (C) 1996,98,2000,02 Free Software Foundation, Inc.
Copyright (C) 1996, 1998, 2000, 2002, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -26,6 +26,8 @@
#include <unistd.h>
#include <sys/file.h>
#include <kernel-features.h>
/* Name of the lock file. */
#define PWD_LOCKFILE "/etc/.pwd.lock"
@ -96,20 +98,38 @@ __lckpwdf (void)
/* Prevent problems caused by multiple threads. */
__libc_lock_lock (lock);
lock_fd = __open (PWD_LOCKFILE, O_WRONLY | O_CREAT, 0600);
int oflags = O_WRONLY | O_CREAT;
#ifdef O_CLOEXEC
oflags |= O_CLOEXEC;
#endif
lock_fd = __open (PWD_LOCKFILE, oflags, 0600);
if (lock_fd == -1)
/* Cannot create lock file. */
RETURN_CLOSE_FD (-1);
/* Make sure file gets correctly closed when process finished. */
flags = __fcntl (lock_fd, F_GETFD, 0);
if (flags == -1)
/* Cannot get file flags. */
RETURN_CLOSE_FD (-1);
flags |= FD_CLOEXEC; /* Close on exit. */
if (__fcntl (lock_fd, F_SETFD, flags) < 0)
/* Cannot set new flags. */
RETURN_CLOSE_FD (-1);
#ifndef __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* Make sure file gets correctly closed when process finished. */
flags = __fcntl (lock_fd, F_GETFD, 0);
if (flags == -1)
/* Cannot get file flags. */
RETURN_CLOSE_FD (-1);
# ifdef O_CLOEXEC
if (__have_o_cloexec == 0)
__have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1;
if (__have_o_cloexec < 0)
# endif
{
flags |= FD_CLOEXEC; /* Close on exit. */
if (__fcntl (lock_fd, F_SETFD, flags) < 0)
/* Cannot set new flags. */
RETURN_CLOSE_FD (-1);
}
}
#endif
/* Now we have to get exclusive write access. Since multiple
process could try this we won't stop when it first fails.