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[BZ 21340] add support for POSIX_SPAWN_SETSID

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This patch adds support for the POSIX_SPAWN_SETSID flag.

It was recently accepted by the Austin Group:
http://austingroupbugs.net/view.php?id=1044

Checked on x86_64

	Daurnimator  <quae@daurnimator.com>
	Adhemerval Zanella  <adhemerval.zanella@linaro.org>

	[BZ #21340]
	* posix/Makefile (tests): Add tst-posix_spawn-setsid to list of tests.
	* posix/spawn.h: define POSIX_SPAWN_SETSID flag.
	* posix/spawnattr_setflags.c (ALL_FLAGS): Add POSIX_SPAWN_SETSID to
	valid flags.
	* posix/tst-posix_spawn-setsid.c: Add test for POSIX_SPAWN_SETSID.
	* sysdeps/mach/hurd/spawni.c (__spawni): Implementation of
	POSIX_SPAWN_SETSID.
	* sysdeps/posix/spawni.c (__spawni): Likewise.
	* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Likewise.
	* NEWS: Add note about POSIX_SPAWN_SETSID support.
This commit is contained in:
Adhemerval Zanella 2017-04-21 10:40:56 -03:00
parent 9581e76dbb
commit daeb1fa2e1
9 changed files with 131 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
ChangeLog
View File

@ -1,3 +1,18 @@
2017-04-24 Daurnimator <quae@daurnimator.com>
Adhemerval Zanella <adhemerval.zanella@linaro.org>
[BZ #21340]
* posix/Makefile (tests): Add tst-posix_spawn-setsid to list of tests.
* posix/spawn.h: define POSIX_SPAWN_SETSID flag.
* posix/spawnattr_setflags.c (ALL_FLAGS): Add POSIX_SPAWN_SETSID to
valid flags.
* posix/tst-posix_spawn-setsid.c: Add test for POSIX_SPAWN_SETSID.
* sysdeps/mach/hurd/spawni.c (__spawni): Implementation of
POSIX_SPAWN_SETSID.
* sysdeps/posix/spawni.c (__spawni): Likewise.
* sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Likewise.
* NEWS: Add note about POSIX_SPAWN_SETSID support.
2017-04-24 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
* sysdeps/generic/math_private.h: Move the declaration of many

5
NEWS
View File

@ -52,6 +52,11 @@ Version 2.26
* The legacy cfree function has been removed. Applications should use the
free function instead.
* posix_spawnattr_setflags now supports POSIX_SPAWN_SETSID flag to create a
new session ID for the posix_spawn and posix_spawnp. It is scheduled to
be added on next major revision of POSIX, so current support is enabled
with _GNU_SOURCE.
Security related changes:
* The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,

2
posix/Makefile
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@ -91,7 +91,7 @@ tests := test-errno tstgetopt testfnm runtests runptests \
bug-getopt5 tst-getopt_long1 bug-regex34 bug-regex35 \
tst-pathconf tst-getaddrinfo4 tst-rxspencer-no-utf8 \
tst-fnmatch3 bug-regex36 tst-getaddrinfo5 \
tst-posix_spawn-fd \
tst-posix_spawn-fd tst-posix_spawn-setsid \
tst-posix_fadvise tst-posix_fadvise64
xtests := bug-ga2
ifeq (yes,$(build-shared))

1
posix/spawn.h
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@ -59,6 +59,7 @@ typedef struct
#define POSIX_SPAWN_SETSCHEDULER 0x20
#ifdef __USE_GNU
# define POSIX_SPAWN_USEVFORK 0x40
# define POSIX_SPAWN_SETSID 0x80
#endif

1
posix/spawnattr_setflags.c
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@ -25,6 +25,7 @@
| POSIX_SPAWN_SETSIGMASK \
| POSIX_SPAWN_SETSCHEDPARAM \
| POSIX_SPAWN_SETSCHEDULER \
| POSIX_SPAWN_SETSID \
| POSIX_SPAWN_USEVFORK)
/* Store flags in the attribute structure. */

95
posix/tst-posix_spawn-setsid.c Normal file
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@ -0,0 +1,95 @@
/* Test posix_spawn setsid attribute.
Copyright (C) 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 <errno.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/resource.h>
#include <unistd.h>
#include <support/check.h>
static void
do_test_setsid (bool test_setsid)
{
pid_t sid, child_sid;
int res;
/* Current session ID. */
sid = getsid(0);
if (sid == (pid_t) -1)
FAIL_EXIT1 ("getsid (0): %m");
posix_spawnattr_t attrp;
/* posix_spawnattr_init should not fail (it basically memset the
attribute). */
posix_spawnattr_init (&attrp);
if (test_setsid)
{
res = posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID);
if (res != 0)
{
errno = res;
FAIL_EXIT1 ("posix_spawnattr_setflags: %m");
}
}
/* Program to run. */
char *args[2] = { (char *) "true", NULL };
pid_t child;
res = posix_spawnp (&child, "true", NULL, &attrp, args, environ);
/* posix_spawnattr_destroy is noop. */
posix_spawnattr_destroy (&attrp);
if (res != 0)
{
errno = res;
FAIL_EXIT1 ("posix_spawnp: %m");
}
/* Child should have a different session ID than parent. */
child_sid = getsid (child);
if (child_sid == (pid_t) -1)
FAIL_EXIT1 ("getsid (%i): %m", child);
if (test_setsid)
{
if (child_sid == sid)
FAIL_EXIT1 ("child session ID matched parent one");
}
else
{
if (child_sid != sid)
FAIL_EXIT1 ("child session ID did not match parent one");
}
}
static int
do_test (void)
{
do_test_setsid (false);
do_test_setsid (true);
return 0;
}
#include <support/test-driver.c>

3
sysdeps/mach/hurd/spawni.c
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@ -281,6 +281,9 @@ __spawni (pid_t *pid, const char *file,
}
#endif
if (!err && (flags & POSIX_SPAWN_SETSID) != 0)
err = __proc_setsid (proc);
/* Set the process group ID. */
if (!err && (flags & POSIX_SPAWN_SETPGROUP) != 0)
err = __proc_setpgrp (proc, new_pid, attrp->__pgrp);

7
sysdeps/posix/spawni.c
View File

@ -101,7 +101,8 @@ __spawni (pid_t *pid, const char *file,
to POSIX. */
|| ((flags & (POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSIGDEF
| POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER
| POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_RESETIDS)) == 0
| POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_RESETIDS
| POSIX_SPAWN_SETSID)) == 0
&& file_actions == NULL))
new_pid = __vfork ();
else
@ -159,6 +160,10 @@ __spawni (pid_t *pid, const char *file,
}
#endif
if ((flags & POSIX_SPAWN_SETSID) != 0
&& __setsid () < 0)
_exit (SPAWN_ERROR);
/* Set the process group ID. */
if ((flags & POSIX_SPAWN_SETPGROUP) != 0
&& __setpgid (0, attrp->__pgrp) != 0)

4
sysdeps/unix/sysv/linux/spawni.c
View File

@ -177,6 +177,10 @@ __spawni_child (void *arguments)
}
#endif
if ((attr->__flags & POSIX_SPAWN_SETSID) != 0
&& __setsid () < 0)
goto fail;
/* Set the process group ID. */
if ((attr->__flags & POSIX_SPAWN_SETPGROUP) != 0
&& (ret = __setpgid (0, attr->__pgrp)) != 0)