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Assume that O_CLOEXEC is always defined and works

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This commit is contained in:
Florian Weimer 2017-04-18 14:56:51 +02:00
parent b48061e1a5
commit cef9b65376
27 changed files with 91 additions and 565 deletions
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56
ChangeLog
View File

@ -1,3 +1,59 @@
2017-04-18 Florian Weimer <fweimer@redhat.com>
* elf/dl-misc.c (_dl_sysdep_read_whole_file): Assume that
O_CLOEXEC is defined.
* include/fcntl.h (__have_o_cloexec): Remove declaration.
* io/Makefile (aux): Remove.
* io/have_o_cloexec.c: Remove file.
* libio/fileops.c (_IO_new_file_fopen): Assume that O_CLOEXEC is
defined and works.
* libio/iopopen.c (_IO_new_proc_open): Assume that O_CLOEXEC is
defined.
* login/utmp_file.c (O_flags): Remove definition.
(setutent_file): Use O_CLOEXEC instead of O_flags. Assume that
O_CLOEXEC works.
(pututline_file): Likewise.
* malloc/mtrace.c: Assume that O_CLOEXEC works.
* nis/nss_compat/compat-grp.c (__compat_have_cloexec): Remove
definition.
(internal_setgrent): Assume that O_CLOEXEC works.
* nis/nss_compat/compat-initgroups.c (__compat_have_cloexec):
Remove definition.
(internal_setgrent): Assume that O_CLOEXEC works.
* nis/nss_compat/compat-pwd.c (__compat_have_cloexec): Remove
definition.
(internal_setpwent): Assume that O_CLOEXEC works.
* nis/nss_compat/compat-spwd.c (__compat_have_cloexec): Remove
definition.
(internal_setspent): Assume that O_CLOEXEC works.
* nscd/connections.c (EXTRA_O_FLAGS): Remove definition.
(nscd_init): Use O_CLOEXEC instead of EXTRA_O_FLAGS. Assume that
O_CLOEXEC is defined and works.
* nss/Makefile (libnss_files-routines): Remove
files-have_o_cloexec.
* nss/nss_db/db-open.c (internal_setent): Assume that O_CLOEXEC is
defined.
* nss/nss_files/files-XXX.c (internal_setent): Assume that
O_CLOEXEC is defined and works.
* nss/nss_files/files-alias.c (internal_setent): Likewise.
* nss/nss_files/files-have_o_cloexec.c: Remove.
* posix/wordexp.c (exec_comm_child): Assume that O_CLOEXEC is
defined.
* shadow/lckpwdf.c (__lckpwdf): Assume that O_CLOEXEC is defined
and works.
* sysdeps/mach/hurd/kernel-features.h (__ASSUME_O_CLOEXEC): Remove
definition.
* sysdeps/nacl/kernel-features.h (__ASSUME_O_CLOEXEC): Likewise.
* sysdeps/posix/getcwd.c (__getcwd): Assume that O_CLOEXEC works.
* sysdeps/posix/opendir.c (opendir_oflags): Turn into enum constant.
(__opendirat, __opendir): Adjust opendir_oflags call.
(check_have_o_cloexec): Remove.
(__alloc_dir): Assume that O_CLOEXEC is defined and works.
* sysdeps/posix/shm_open.c (shm_open): Assume that O_CLOEXEC is
defined.
* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_O_CLOEXEC):
Remove definition.
2017-04-18 Florian Weimer <fweimer@redhat.com>
* include/unistd.h (__have_dup3): Remove declaration.

6
elf/dl-misc.c
View File

@ -45,11 +45,7 @@ _dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
{
void *result = MAP_FAILED;
struct stat64 st;
int flags = O_RDONLY;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
int fd = __open (file, flags);
int fd = __open (file, O_RDONLY | O_CLOEXEC);
if (fd >= 0)
{
if (__fxstat64 (_STAT_VER, fd, &st) >= 0)

4
include/fcntl.h
View File

@ -36,10 +36,6 @@ extern int __openat64_2 (int __fd, const char *__path, int __oflag);
/* Flag determining whether the *at system calls are available. */
extern int __have_atfcts attribute_hidden;
#ifdef O_CLOEXEC
extern int __have_o_cloexec attribute_hidden;
#endif
#endif
#endif

2
io/Makefile
View File

@ -55,8 +55,6 @@ routines := \
sendfile sendfile64 \
utimensat futimens
aux := have_o_cloexec
# These routines will be omitted from the libc shared object.
# Instead the static object files will be included in a special archive
# linked against when the shared library will be used.

23
io/have_o_cloexec.c
View File

@ -1,23 +0,0 @@
/* Copyright (C) 2007-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <kernel-features.h>
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
int __have_o_cloexec;
#endif

16
libio/fileops.c
View File

@ -321,9 +321,7 @@ _IO_new_file_fopen (_IO_FILE *fp, const char *filename, const char *mode,
fp->_flags2 |= _IO_FLAGS2_NOTCANCEL;
continue;
case 'e':
#ifdef O_CLOEXEC
oflags |= O_CLOEXEC;
#endif
fp->_flags2 |= _IO_FLAGS2_CLOEXEC;
continue;
default:
@ -338,20 +336,6 @@ _IO_new_file_fopen (_IO_FILE *fp, const char *filename, const char *mode,
if (result != NULL)
{
#ifndef __ASSUME_O_CLOEXEC
if ((fp->_flags2 & _IO_FLAGS2_CLOEXEC) != 0 && __have_o_cloexec <= 0)
{
int fd = _IO_fileno (fp);
if (__have_o_cloexec == 0)
{
int flags = __fcntl (fd, F_GETFD);
__have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1;
}
if (__have_o_cloexec < 0)
__fcntl (fd, F_SETFD, FD_CLOEXEC);
}
#endif
/* Test whether the mode string specifies the conversion. */
cs = strstr (last_recognized + 1, ",ccs=");
if (cs != NULL)

2
libio/iopopen.c
View File

@ -173,12 +173,10 @@ _IO_new_proc_open (_IO_FILE *fp, const char *command, const char *mode)
if (child_end != child_std_end)
_IO_dup2 (child_end, child_std_end);
#ifdef O_CLOEXEC
else
/* The descriptor is already the one we will use. But it must
not be marked close-on-exec. Undo the effects. */
__fcntl (child_end, F_SETFD, 0);
#endif
/* POSIX.2: "popen() shall ensure that any streams from previous
popen() calls that remain open in the parent process are closed
in the new child process." */

65
login/utmp_file.c
View File

@ -141,42 +141,11 @@ setutent_file (void)
file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
#ifdef O_CLOEXEC
# define O_flags O_LARGEFILE | O_CLOEXEC
#else
# define O_flags O_LARGEFILE
#endif
file_writable = false;
file_fd = open_not_cancel_2 (file_name, O_RDONLY | O_flags);
file_fd = open_not_cancel_2
(file_name, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
if (file_fd == -1)
return 0;
#ifndef __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* We have to make sure the file is `closed on exec'. */
int result = fcntl_not_cancel (file_fd, F_GETFD, 0);
if (result >= 0)
{
# ifdef O_CLOEXEC
if (__have_o_cloexec == 0)
__have_o_cloexec = (result & FD_CLOEXEC) ? 1 : -1;
if (__have_o_cloexec < 0)
# endif
result = fcntl_not_cancel (file_fd, F_SETFD,
result | FD_CLOEXEC);
}
if (result == -1)
{
close_not_cancel_no_status (file_fd);
return 0;
}
}
#endif
}
__lseek64 (file_fd, 0, SEEK_SET);
@ -404,37 +373,11 @@ pututline_file (const struct utmp *data)
/* We must make the file descriptor writable before going on. */
const char *file_name = TRANSFORM_UTMP_FILE_NAME (__libc_utmp_file_name);
int new_fd = open_not_cancel_2 (file_name, O_RDWR | O_flags);
int new_fd = open_not_cancel_2
(file_name, O_RDWR | O_LARGEFILE | O_CLOEXEC);
if (new_fd == -1)
return NULL;
#ifndef __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* We have to make sure the file is `closed on exec'. */
int result = fcntl_not_cancel (file_fd, F_GETFD, 0);
if (result >= 0)
{
# ifdef O_CLOEXEC
if (__have_o_cloexec == 0)
__have_o_cloexec = (result & FD_CLOEXEC) ? 1 : -1;
if (__have_o_cloexec < 0)
# endif
result = fcntl_not_cancel (file_fd, F_SETFD,
result | FD_CLOEXEC);
}
if (result == -1)
{
close_not_cancel_no_status (file_fd);
return NULL;
}
}
#endif
if (__lseek64 (new_fd, __lseek64 (file_fd, 0, SEEK_CUR), SEEK_SET) == -1
|| __dup2 (new_fd, file_fd) < 0)
{

9
malloc/mtrace.c
View File

@ -300,15 +300,6 @@ mtrace (void)
mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "wce");
if (mallstream != NULL)
{
#ifndef __ASSUME_O_CLOEXEC
/* Make sure we close the file descriptor on exec. */
int flags = __fcntl (fileno (mallstream), F_GETFD, 0);
if (flags >= 0)
{
flags |= FD_CLOEXEC;
__fcntl (fileno (mallstream), F_SETFD, flags);
}
#endif
/* Be sure it doesn't malloc its buffer! */
malloc_trace_buffer = mtb;
setvbuf (mallstream, malloc_trace_buffer, _IOFBF, TRACE_BUFFER_SIZE);

52
nis/nss_compat/compat-grp.c
View File

@ -70,19 +70,6 @@ static ent_t ext_ent = { TRUE, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0 }};
/* Protect global state against multiple changers. */
__libc_lock_define_initialized (static, lock)
/* Positive if O_CLOEXEC is supported, negative if it is not supported,
zero if it is still undecided. This variable is shared with the
other compat functions. */
#ifdef __ASSUME_O_CLOEXEC
# define __compat_have_cloexec 1
#else
# ifdef O_CLOEXEC
int __compat_have_cloexec;
# else
# define __compat_have_cloexec -1
# endif
#endif
/* Prototypes for local functions. */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);
@ -125,43 +112,8 @@ internal_setgrent (ent_t *ent, int stayopen, int needent)
if (ent->stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result = 0;
if (__compat_have_cloexec <= 0)
{
int flags;
result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
0);
if (result >= 0)
{
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
if (__compat_have_cloexec == 0)
__compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
if (__compat_have_cloexec < 0)
#endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
flags);
}
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (ent->stream);
ent->stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
else
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
else
rewind (ent->stream);

52
nis/nss_compat/compat-initgroups.c
View File

@ -77,20 +77,6 @@ struct ent_t
};
typedef struct ent_t ent_t;
/* Positive if O_CLOEXEC is supported, negative if it is not supported,
zero if it is still undecided. This variable is shared with the
other compat functions. */
#ifdef __ASSUME_O_CLOEXEC
# define __compat_have_cloexec 1
#else
# ifdef O_CLOEXEC
extern int __compat_have_cloexec;
# else
# define __compat_have_cloexec -1
# endif
#endif
/* Prototypes for local functions. */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);
@ -141,42 +127,8 @@ internal_setgrent (ent_t *ent)
if (ent->stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result = 0;
if (__compat_have_cloexec <= 0)
{
int flags;
result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD, 0);
if (result >= 0)
{
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
if (__compat_have_cloexec == 0)
__compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
if (__compat_have_cloexec < 0)
#endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
flags);
}
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (ent->stream);
ent->stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
else
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
return status;
}

52
nis/nss_compat/compat-pwd.c
View File

@ -80,19 +80,6 @@ static ent_t ext_ent = { false, false, true, NSS_STATUS_SUCCESS, NULL,
/* Protect global state against multiple changers. */
__libc_lock_define_initialized (static, lock)
/* Positive if O_CLOEXEC is supported, negative if it is not supported,
zero if it is still undecided. This variable is shared with the
other compat functions. */
#ifdef __ASSUME_O_CLOEXEC
# define __compat_have_cloexec 1
#else
# ifdef O_CLOEXEC
extern int __compat_have_cloexec;
# else
# define __compat_have_cloexec -1
# endif
#endif
/* Prototypes for local functions. */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);
@ -240,43 +227,8 @@ internal_setpwent (ent_t *ent, int stayopen, int needent)
if (ent->stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result = 0;
if (__compat_have_cloexec <= 0)
{
int flags;
result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
0);
if (result >= 0)
{
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
if (__compat_have_cloexec == 0)
__compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
if (__compat_have_cloexec < 0)
#endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
flags);
}
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (ent->stream);
ent->stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
else
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
else
rewind (ent->stream);

52
nis/nss_compat/compat-spwd.c
View File

@ -77,19 +77,6 @@ static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL,
/* Protect global state against multiple changers. */
__libc_lock_define_initialized (static, lock)
/* Positive if O_CLOEXEC is supported, negative if it is not supported,
zero if it is still undecided. This variable is shared with the
other compat functions. */
#ifdef __ASSUME_O_CLOEXEC
# define __compat_have_cloexec 1
#else
# ifdef O_CLOEXEC
extern int __compat_have_cloexec;
# else
# define __compat_have_cloexec -1
# endif
#endif
/* Prototypes for local functions. */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);
@ -196,43 +183,8 @@ internal_setspent (ent_t *ent, int stayopen, int needent)
if (ent->stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
/* We have to make sure the file is `closed on exec'. */
int result = 0;
if (__compat_have_cloexec <= 0)
{
int flags;
result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
0);
if (result >= 0)
{
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
if (__compat_have_cloexec == 0)
__compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
if (__compat_have_cloexec < 0)
#endif
{
flags |= FD_CLOEXEC;
result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
flags);
}
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (ent->stream);
ent->stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
else
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
/* We take care of locking ourself. */
__fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
}
else
rewind (ent->stream);

37
nscd/connections.c
View File

@ -499,13 +499,6 @@ fail:
}
#ifdef O_CLOEXEC
# define EXTRA_O_FLAGS O_CLOEXEC
#else
# define EXTRA_O_FLAGS 0
#endif
/* Initialize database information structures. */
void
nscd_init (void)
@ -528,7 +521,7 @@ nscd_init (void)
if (dbs[cnt].persistent)
{
/* Try to open the appropriate file on disk. */
int fd = open (dbs[cnt].db_filename, O_RDWR | EXTRA_O_FLAGS);
int fd = open (dbs[cnt].db_filename, O_RDWR | O_CLOEXEC);
if (fd != -1)
{
char *msg = NULL;
@ -608,7 +601,7 @@ nscd_init (void)
if (dbs[cnt].shared)
{
dbs[cnt].ro_fd = open (dbs[cnt].db_filename,
O_RDONLY | EXTRA_O_FLAGS);
O_RDONLY | O_CLOEXEC);
if (dbs[cnt].ro_fd == -1)
dbg_log (_("\
cannot create read-only descriptor for \"%s\"; no mmap"),
@ -648,23 +641,23 @@ cannot create read-only descriptor for \"%s\"; no mmap"),
if (dbs[cnt].persistent)
{
fd = open (dbs[cnt].db_filename,
O_RDWR | O_CREAT | O_EXCL | O_TRUNC | EXTRA_O_FLAGS,
O_RDWR | O_CREAT | O_EXCL | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR);
if (fd != -1 && dbs[cnt].shared)
ro_fd = open (dbs[cnt].db_filename,
O_RDONLY | EXTRA_O_FLAGS);
O_RDONLY | O_CLOEXEC);
}
else
{
char fname[] = _PATH_NSCD_XYZ_DB_TMP;
fd = mkostemp (fname, EXTRA_O_FLAGS);
fd = mkostemp (fname, O_CLOEXEC);
/* We do not need the file name anymore after we
opened another file descriptor in read-only mode. */
if (fd != -1)
{
if (dbs[cnt].shared)
ro_fd = open (fname, O_RDONLY | EXTRA_O_FLAGS);
ro_fd = open (fname, O_RDONLY | O_CLOEXEC);
unlink (fname);
}
@ -782,24 +775,6 @@ cannot create read-only descriptor for \"%s\"; no mmap"),
}
}
#if !defined O_CLOEXEC || !defined __ASSUME_O_CLOEXEC
/* We do not check here whether the O_CLOEXEC provided to the
open call was successful or not. The two fcntl calls are
only performed once each per process start-up and therefore
is not noticeable at all. */
if (paranoia
&& ((dbs[cnt].wr_fd != -1
&& fcntl (dbs[cnt].wr_fd, F_SETFD, FD_CLOEXEC) == -1)
|| (dbs[cnt].ro_fd != -1
&& fcntl (dbs[cnt].ro_fd, F_SETFD, FD_CLOEXEC) == -1)))
{
dbg_log (_("\
cannot set socket to close on exec: %s; disabling paranoia mode"),
strerror (errno));
paranoia = 0;
}
#endif
if (dbs[cnt].head == NULL)
{
/* We do not use the persistent database. Just

2
nss/Makefile
View File

@ -74,7 +74,7 @@ vpath %.c $(subdir-dirs) ../locale/programs ../intl
libnss_files-routines := $(addprefix files-,$(databases)) \
files-initgroups files-have_o_cloexec files-init
files-initgroups files-init
libnss_db-dbs := $(addprefix db-,\
$(filter-out hosts network key alias,\

6
nss/nss_db/db-open.c
View File

@ -36,11 +36,7 @@ internal_setent (const char *file, struct nss_db_map *mapping)
{
enum nss_status status = NSS_STATUS_UNAVAIL;
int mode = O_RDONLY | O_LARGEFILE;
#ifdef O_CLOEXEC
mode |= O_CLOEXEC;
#endif
int fd = open_not_cancel_2 (file, mode);
int fd = open_not_cancel_2 (file, O_RDONLY | O_LARGEFILE | O_CLOEXEC);
if (fd != -1)
{
struct nss_db_header header;

35
nss/nss_files/files-XXX.c
View File

@ -78,41 +78,6 @@ internal_setent (FILE **stream)
if (*stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
#if !defined O_CLOEXEC || !defined __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* We have to make sure the file is `closed on exec'. */
int result;
int flags;
result = flags = fcntl (fileno (*stream), F_GETFD, 0);
if (result >= 0)
{
# 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;
result = fcntl (fileno (*stream), F_SETFD, flags);
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (*stream);
*stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
#endif
}
}
else
rewind (*stream);

35
nss/nss_files/files-alias.c
View File

@ -51,41 +51,6 @@ internal_setent (FILE **stream)
if (*stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
#if !defined O_CLOEXEC || !defined __ASSUME_O_CLOEXEC
# ifdef O_CLOEXEC
if (__have_o_cloexec <= 0)
# endif
{
/* We have to make sure the file is `closed on exec'. */
int result;
int flags;
result = flags = fcntl (fileno (*stream), F_GETFD, 0);
if (result >= 0)
{
# 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;
result = fcntl (fileno (*stream), F_SETFD, flags);
}
}
if (result < 0)
{
/* Something went wrong. Close the stream and return a
failure. */
fclose (*stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
#endif
}
}
else
rewind (*stream);

23
nss/nss_files/files-have_o_cloexec.c
View File

@ -1,23 +0,0 @@
/* Copyright (C) 2007-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <kernel-features.h>
#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
int __have_o_cloexec;
#endif

8
posix/wordexp.c
View File

@ -833,12 +833,8 @@ exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
__close (fildes[1]);
}
else
{
#ifdef O_CLOEXEC
/* Reset the close-on-exec flag (if necessary). */
__fcntl (fildes[1], F_SETFD, 0);
#endif
}
/* Reset the close-on-exec flag (if necessary). */
__fcntl (fildes[1], F_SETFD, 0);
/* Redirect stderr to /dev/null if we have to. */
if (showerr == 0)

29
shadow/lckpwdf.c
View File

@ -96,39 +96,12 @@ __lckpwdf (void)
/* Prevent problems caused by multiple threads. */
__libc_lock_lock (lock);
int oflags = O_WRONLY | O_CREAT;
#ifdef O_CLOEXEC
oflags |= O_CLOEXEC;
#endif
int oflags = O_WRONLY | O_CREAT | O_CLOEXEC;
lock_fd = __open (PWD_LOCKFILE, oflags, 0600);
if (lock_fd == -1)
/* Cannot create lock file. */
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. */
int 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.
Instead we set a timeout for the system call. Once the timer

1
sysdeps/mach/hurd/kernel-features.h
View File

@ -20,5 +20,4 @@
Almost none of these are used outside of sysdeps/unix/sysv/linux code.
But those referring to POSIX-level features like O_* flags can be. */
#define __ASSUME_O_CLOEXEC 1
#define __ASSUME_ACCEPT4 1

2
sysdeps/nacl/kernel-features.h
View File

@ -20,8 +20,6 @@
Almost none of these are used outside of sysdeps/unix/sysv/linux code.
But those referring to POSIX-level features like O_* flags can be. */
#define __ASSUME_O_CLOEXEC 1
/*
#define __ASSUME_ACCEPT4 1
*/

8
sysdeps/posix/getcwd.c
View File

@ -281,13 +281,7 @@ __getcwd (char *buf, size_t size)
while (!(thisdev == rootdev && thisino == rootino))
{
if (__have_atfcts >= 0)
{
int mode = O_RDONLY;
#ifdef O_CLOEXEC
mode |= O_CLOEXEC;
#endif
fd = openat64_not_cancel_3 (fd, "..", mode);
}
fd = openat64_not_cancel_3 (fd, "..", O_RDONLY | O_CLOEXEC);
else
fd = -1;
if (fd >= 0)

47
sysdeps/posix/opendir.c
View File

@ -81,6 +81,9 @@ tryopen_o_directory (void)
# define EXTRA_FLAGS 0
#endif
enum {
opendir_oflags = O_RDONLY|O_NDELAY|EXTRA_FLAGS|O_LARGEFILE|O_CLOEXEC
};
static bool
invalid_name (const char *name)
@ -110,18 +113,6 @@ need_isdir_precheck (void)
return true;
}
static int
opendir_oflags (void)
{
int flags = O_RDONLY|O_NDELAY|EXTRA_FLAGS|O_LARGEFILE;
#ifdef O_CLOEXEC
flags |= O_CLOEXEC;
#endif
return flags;
}
static DIR *
opendir_tail (int fd)
{
@ -170,7 +161,7 @@ __opendirat (int dfd, const char *name)
}
}
return opendir_tail (openat_not_cancel_3 (dfd, name, opendir_oflags ()));
return opendir_tail (openat_not_cancel_3 (dfd, name, opendir_oflags));
}
#endif
@ -197,39 +188,19 @@ __opendir (const char *name)
}
}
return opendir_tail (open_not_cancel_2 (name, opendir_oflags ()));
return opendir_tail (open_not_cancel_2 (name, opendir_oflags));
}
weak_alias (__opendir, opendir)
#ifdef __ASSUME_O_CLOEXEC
# define check_have_o_cloexec(fd) 1
#else
static int
check_have_o_cloexec (int fd)
{
if (__have_o_cloexec == 0)
__have_o_cloexec = (__fcntl (fd, F_GETFD, 0) & FD_CLOEXEC) == 0 ? -1 : 1;
return __have_o_cloexec > 0;
}
#endif
DIR *
internal_function
__alloc_dir (int fd, bool close_fd, int flags, const struct stat64 *statp)
{
/* We always have to set the close-on-exit flag if the user provided
the file descriptor. Otherwise only if we have no working
O_CLOEXEC support. */
#ifdef O_CLOEXEC
if ((! close_fd && (flags & O_CLOEXEC) == 0)
|| ! check_have_o_cloexec (fd))
#endif
{
if (__builtin_expect (__fcntl (fd, F_SETFD, FD_CLOEXEC), 0) < 0)
/* We have to set the close-on-exit flag if the user provided the
file descriptor. */
if (!close_fd
&& __builtin_expect (__fcntl (fd, F_SETFD, FD_CLOEXEC), 0) < 0)
goto lose;
}
const size_t default_allocation = (4 * BUFSIZ < sizeof (struct dirent64)
? sizeof (struct dirent64) : 4 * BUFSIZ);

28
sysdeps/posix/shm_open.c
View File

@ -34,10 +34,7 @@ shm_open (const char *name, int oflag, mode_t mode)
{
SHM_GET_NAME (EINVAL, -1, "");
oflag |= O_NOFOLLOW;
# ifdef O_CLOEXEC
oflag |= O_CLOEXEC;
# endif
oflag |= O_NOFOLLOW | O_CLOEXEC;
/* Disable asynchronous cancellation. */
int state;
@ -50,29 +47,6 @@ shm_open (const char *name, int oflag, mode_t mode)
object names and the standard does not mention EISDIR. */
__set_errno (EINVAL);
# ifndef O_CLOEXEC
if (fd != -1)
{
/* We got a descriptor. Now set the FD_CLOEXEC bit. */
int flags = fcntl (fd, F_GETFD, 0);
if (__glibc_likely (flags != -1))
{
flags |= FD_CLOEXEC;
flags = fcntl (fd, F_SETFD, flags);
}
if (flags == -1)
{
/* Something went wrong. We cannot return the descriptor. */
int save_errno = errno;
close (fd);
fd = -1;
__set_errno (save_errno);
}
}
# endif
pthread_setcancelstate (state, NULL);
return fd;

4
sysdeps/unix/sysv/linux/kernel-features.h
View File

@ -67,10 +67,6 @@
/* Support for private futexes was added in 2.6.22. */
#define __ASSUME_PRIVATE_FUTEX 1
/* Support for various CLOEXEC and NONBLOCK flags was added in
2.6.23. */
#define __ASSUME_O_CLOEXEC 1
/* Support for various CLOEXEC and NONBLOCK flags was added in
2.6.27. */
#define __ASSUME_IN_NONBLOCK 1