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posix: Add pidfd_spawn and pidfd_spawnp (BZ 30349)

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Returning a pidfd allows a process to keep a race-free handle for a
child process, otherwise, the caller will need to either use pidfd_open
(which still might be subject to TOCTOU) or keep the old racy interface
base on pid_t.

To correct use pifd_spawn, the kernel must support not only returning
the pidfd with clone/clone3 but also waitid (P_PIDFD) (added on Linux
5.4).  If kernel does not support the waitid, pidfd return ENOSYS.
It avoids the need to racy workarounds, such as reading the procfs
fdinfo to get the pid to use along with other wait interfaces.

These interfaces are similar to the posix_spawn and posix_spawnp, with
the only difference being it returns a process file descriptor (int)
instead of a process ID (pid_t).  Their prototypes are:

  int pidfd_spawn (int *restrict pidfd,
                   const char *restrict file,
                   const posix_spawn_file_actions_t *restrict facts,
                   const posix_spawnattr_t *restrict attrp,
                   char *const argv[restrict],
                   char *const envp[restrict])

  int pidfd_spawnp (int *restrict pidfd,
                    const char *restrict path,
                    const posix_spawn_file_actions_t *restrict facts,
                    const posix_spawnattr_t *restrict attrp,
                    char *const argv[restrict_arr],
                    char *const envp[restrict_arr]);

A new symbol is used instead of a posix_spawn extension to avoid
possible issues with language bindings that might track the return
argument lifetime.  Although on Linux pid_t and int are interchangeable,
POSIX only states that pid_t should be a signed integer.

Both symbols reuse the posix_spawn posix_spawn_file_actions_t and
posix_spawnattr_t, to void rehash posix_spawn API or add a new one. It
also means that both interfaces support the same attribute and file
actions, and a new flag or file action on posix_spawn is also added
automatically for pidfd_spawn.

Also, using posix_spawn plumbing allows the reusing of most of the
current testing with some changes:

  - waitid is used instead of waitpid since it is a more generic
    interface.

  - tst-posix_spawn-setsid.c is adapted to take into consideration that
    the caller can check for session id directly.  The test now spawns
itself and writes the session id as a file instead.

  - tst-spawn3.c need to know where pidfd_spawn is used so it keeps an
    extra file description unused.

Checked on x86_64-linux-gnu on Linux 4.15 (no CLONE_PIDFD or waitid
support), Linux 5.4 (full support), and Linux 6.2.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto 2023-08-24 13:42:18 -03:00 committed by Adhemerval Zanella
parent ce2bfb8569
commit 0d6f9f6265
66 changed files with 784 additions and 146 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
NEWS
View File

@ -20,6 +20,13 @@ Major new features:
to set the cgroupv2 in the new process in a race-free manner. These
functions are GNU extensions and require a kernel with clone3 support.
* On Linux, the pidfd_spawn and pidfd_spawp functions have been added.
They have a similar prototype and semantic as posix_spawn, but instead of
returning a process ID, they return a file descriptor that can be used
along other pidfd functions (like pidfd_send_signal, poll, or waitid).
The pidfd functionality avoids the issue of PID reuse with the traditional
posix_spawn interface.
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]

4
include/clone_internal.h
View File

@ -35,6 +35,10 @@ extern int __clone_internal_fallback (struct clone_args *__cl_args,
void *__arg)
attribute_hidden;
/* Return whether the kernel supports pid file descriptor, including clone
with CLONE_PIDFD and waitid with P_PIDFD. */
extern bool __clone_pidfd_supported (void) attribute_hidden;
#ifndef _ISOMAC
libc_hidden_proto (__clone3)
libc_hidden_proto (__clone_internal)

14
manual/process.texi
View File

@ -136,13 +136,13 @@ creating a process and making it run another program.
@cindex parent process
@cindex subprocess
A new processes is created when one of the functions
@code{posix_spawn}, @code{fork}, @code{_Fork} or @code{vfork} is called.
(The @code{system} and @code{popen} also create new processes internally.)
Due to the name of the @code{fork} function, the act of creating a new
process is sometimes called @dfn{forking} a process. Each new process
(the @dfn{child process} or @dfn{subprocess}) is allocated a process
ID, distinct from the process ID of the parent process. @xref{Process
Identification}.
@code{posix_spawn}, @code{fork}, @code{_Fork}, @code{vfork}, or
@code{pidfd_spawn} is called. (The @code{system} and @code{popen} also
create new processes internally.) Due to the name of the @code{fork}
function, the act of creating a new process is sometimes called
@dfn{forking} a process. Each new process (the @dfn{child process} or
@dfn{subprocess}) is allocated a process ID, distinct from the process
ID of the parent process. @xref{Process Identification}.
After forking a child process, both the parent and child processes
continue to execute normally. If you want your program to wait for a

1
posix/Makefile
View File

@ -602,6 +602,7 @@ tst-spawn-static-ARGS = $(tst-spawn-ARGS)
tst-spawn5-ARGS = -- $(host-test-program-cmd)
tst-spawn6-ARGS = -- $(host-test-program-cmd)
tst-spawn7-ARGS = -- $(host-test-program-cmd)
tst-posix_spawn-setsid-ARGS = -- $(host-test-program-cmd)
tst-dir-ARGS = `pwd` `cd $(common-objdir)/$(subdir); pwd` `cd $(common-objdir); pwd` $(objpfx)tst-dir
tst-chmod-ARGS = $(objdir)
tst-vfork3-ARGS = --test-dir=$(objpfx)

3
posix/spawn_int.h
View File

@ -76,12 +76,13 @@ struct __spawn_action
#define SPAWN_XFLAGS_USE_PATH 0x1
#define SPAWN_XFLAGS_TRY_SHELL 0x2
#define SPAWN_XFLAGS_RET_PIDFD 0x4
extern int __posix_spawn_file_actions_realloc (posix_spawn_file_actions_t *
file_actions)
attribute_hidden;
extern int __spawni (pid_t *pid, const char *path,
extern int __spawni (int *pid, const char *path,
const posix_spawn_file_actions_t *file_actions,
const posix_spawnattr_t *attrp, char *const argv[],
char *const envp[], int xflags) attribute_hidden;

163
posix/tst-posix_spawn-setsid.c
View File

@ -18,78 +18,159 @@
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <intprops.h>
#include <paths.h>
#include <spawn.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <unistd.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
#include <tst-spawn.h>
/* Nonzero if the program gets called via `exec'. */
static int restart;
/* Hold the four initial argument used to respawn the process, plus
the extra '--direct' and '--restart', and a final NULL. */
static char *initial_argv[7];
static int initial_argv_count;
#define CMDLINE_OPTIONS \
{ "restart", no_argument, &restart, 1 },
static char *pidfile;
static pid_t
read_child_sid (void)
{
int pidfd = xopen (pidfile, O_RDONLY, 0);
char buf[INT_STRLEN_BOUND (pid_t)];
ssize_t n = read (pidfd, buf, sizeof (buf));
TEST_VERIFY (n < sizeof buf && n >= 0);
buf[n] = '\0';
/* We only expect to read the PID. */
char *endp;
long int rpid = strtol (buf, &endp, 10);
TEST_VERIFY (endp != buf);
xclose (pidfd);
return rpid;
}
/* Called on process re-execution, write down the session id on PIDFILE. */
static void
handle_restart (const char *pidfile)
{
int pidfd = xopen (pidfile, O_WRONLY, 0);
char buf[INT_STRLEN_BOUND (pid_t)];
int s = snprintf (buf, sizeof buf, "%d", getsid (0));
size_t n = write (pidfd, buf, s);
TEST_VERIFY (n == s);
xclose (pidfd);
}
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");
pid_t sid = getsid (0);
TEST_VERIFY (sid != (pid_t) -1);
posix_spawnattr_t attrp;
/* posix_spawnattr_init should not fail (it basically memset the
attribute). */
posix_spawnattr_init (&attrp);
TEST_COMPARE (posix_spawnattr_init (&attrp), 0);
if (test_setsid)
{
res = posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID);
if (res != 0)
{
errno = res;
FAIL_EXIT1 ("posix_spawnattr_setflags: %m");
}
}
TEST_COMPARE (posix_spawnattr_setflags (&attrp, POSIX_SPAWN_SETSID), 0);
/* Program to run. */
char *args[2] = { (char *) "true", NULL };
pid_t child;
/* 1 or 4 elements from initial_argv:
+ path to ld.so optional
+ --library-path optional
+ the library path optional
+ application name
+ --direct
+ --restart
+ pidfile */
int argv_size = initial_argv_count + 2;
char *args[argv_size];
int argc = 0;
res = posix_spawnp (&child, "true", NULL, &attrp, args, environ);
/* posix_spawnattr_destroy is noop. */
posix_spawnattr_destroy (&attrp);
for (char **arg = initial_argv; *arg != NULL; arg++)
args[argc++] = *arg;
args[argc++] = pidfile;
args[argc] = NULL;
TEST_VERIFY (argc < argv_size);
if (res != 0)
{
errno = res;
FAIL_EXIT1 ("posix_spawnp: %m");
}
PID_T_TYPE pid;
TEST_COMPARE (POSIX_SPAWN (&pid, args[0], NULL, &attrp, args, environ), 0);
TEST_COMPARE (posix_spawnattr_destroy (&attrp), 0);
siginfo_t sinfo;
TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
pid_t child_sid = read_child_sid ();
/* 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);
TEST_VERIFY (child_sid != (pid_t) -1);
if (test_setsid)
{
if (child_sid == sid)
FAIL_EXIT1 ("child session ID matched parent one");
}
TEST_VERIFY (child_sid != sid);
else
{
if (child_sid != sid)
FAIL_EXIT1 ("child session ID did not match parent one");
}
TEST_VERIFY (child_sid == sid);
}
static int
do_test (void)
do_test (int argc, char *argv[])
{
/* We must have either:
- one or four parameters if called initially:
+ argv[1]: path for ld.so optional
+ argv[2]: "--library-path" optional
+ argv[3]: the library path optional
+ argv[4]: the application name
- six parameters left if called through re-execution:
+ argv[5/1]: the application name
+ argv[6/2]: the pidfile
* When built with --enable-hardcoded-path-in-tests or issued without
using the loader directly. */
if (restart)
{
handle_restart (argv[1]);
return 0;
}
TEST_VERIFY_EXIT (argc == 2 || argc == 5);
int i;
for (i = 0; i < argc - 1; i++)
initial_argv[i] = argv[i + 1];
initial_argv[i++] = (char *) "--direct";
initial_argv[i++] = (char *) "--restart";
initial_argv_count = i;
create_temp_file ("tst-posix_spawn-setsid-", &pidfile);
do_test_setsid (false);
do_test_setsid (true);
return 0;
}
#define TEST_FUNCTION_ARGV do_test
#include <support/test-driver.c>

15
posix/tst-spawn-chdir.c
View File

@ -29,7 +29,9 @@
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
#include <tst-spawn.h>
/* Reads the file at PATH, which must consist of exactly one line.
Removes the line terminator at the end of the file. */
@ -169,17 +171,18 @@ do_test (void)
char *const argv[] = { (char *) "pwd", NULL };
char *const envp[] = { NULL } ;
pid_t pid;
PID_T_TYPE pid;
if (do_spawnp)
TEST_COMPARE (posix_spawnp (&pid, "pwd", &actions,
TEST_COMPARE (POSIX_SPAWNP (&pid, "pwd", &actions,
NULL, argv, envp), 0);
else
TEST_COMPARE (posix_spawn (&pid, "subdir/pwd-symlink", &actions,
TEST_COMPARE (POSIX_SPAWN (&pid, "subdir/pwd-symlink", &actions,
NULL, argv, envp), 0);
TEST_VERIFY (pid > 0);
int status;
xwaitpid (pid, &status, 0);
TEST_COMPARE (status, 0);
siginfo_t sinfo;
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
/* Check that the current directory did not change. */
{

24
posix/tst-spawn.c
View File

@ -25,11 +25,13 @@
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
#include <support/support.h>
#include <tst-spawn.h>
/* Nonzero if the program gets called via `exec'. */
@ -143,9 +145,9 @@ handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
static int
do_test (int argc, char *argv[])
{
pid_t pid;
PID_T_TYPE pid;
int fd4;
int status;
siginfo_t sinfo;
posix_spawn_file_actions_t actions;
char fd1name[18];
char fd2name[18];
@ -233,17 +235,16 @@ do_test (int argc, char *argv[])
spargv[i++] = fd5name;
spargv[i] = NULL;
TEST_COMPARE (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ),
TEST_COMPARE (POSIX_SPAWN (&pid, argv[1], &actions, NULL, spargv, environ),
0);
/* Wait for the children. */
TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
/* Same test but with a NULL pid argument. */
TEST_COMPARE (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ),
TEST_COMPARE (POSIX_SPAWN (NULL, argv[1], &actions, NULL, spargv, environ),
0);
/* Cleanup. */
@ -251,10 +252,9 @@ do_test (int argc, char *argv[])
free (name3_copy);
/* Wait for the children. */
xwaitpid (-1, &status, 0);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
return 0;
}

36
posix/tst-spawn.h Normal file
View File

@ -0,0 +1,36 @@
/* Generic definitions for posix_spawn tests.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#ifndef PID_T_TYPE
# define PID_T_TYPE pid_t
#endif
#ifndef POSIX_SPAWN
# define POSIX_SPAWN(__child, __path, __actions, __attr, __argv, __envp) \
posix_spawn (__child, __path, __actions, __attr, __argv, __envp)
#endif
#ifndef POSIX_SPAWNP
# define POSIX_SPAWNP(__child, __path, __actions, __attr, __argv, __envp) \
posix_spawnp (__child, __path, __actions, __attr, __argv, __envp)
#endif
#ifndef WAITID
# define WAITID(__idtype, __id, __info, __opts) \
waitid (__idtype, __id, __info, __opts)
#endif

17
posix/tst-spawn2.c
View File

@ -26,6 +26,7 @@
#include <stdio.h>
#include <support/check.h>
#include <tst-spawn.h>
int
do_test (void)
@ -35,9 +36,9 @@ do_test (void)
const char *program = "/path/to/invalid/binary";
char * const args[] = { 0 };
pid_t pid = -1;
PID_T_TYPE pid = -1;
int ret = posix_spawn (&pid, program, 0, 0, args, environ);
int ret = POSIX_SPAWN (&pid, program, 0, 0, args, environ);
if (ret != ENOENT)
{
errno = ret;
@ -51,14 +52,13 @@ do_test (void)
FAIL_EXIT1 ("posix_spawn returned pid != -1 (%i)", (int) pid);
/* Check if no child is actually created. */
ret = waitpid (-1, NULL, 0);
if (ret != -1 || errno != ECHILD)
FAIL_EXIT1 ("waitpid: %m)");
TEST_COMPARE (WAITID (P_ALL, 0, NULL, WEXITED), -1);
TEST_COMPARE (errno, ECHILD);
/* Same as before, but with posix_spawnp. */
char *args2[] = { (char*) program, 0 };
ret = posix_spawnp (&pid, args2[0], 0, 0, args2, environ);
ret = POSIX_SPAWNP (&pid, args2[0], 0, 0, args2, environ);
if (ret != ENOENT)
{
errno = ret;
@ -68,9 +68,8 @@ do_test (void)
if (pid != -1)
FAIL_EXIT1 ("posix_spawnp returned pid != -1 (%i)", (int) pid);
ret = waitpid (-1, NULL, 0);
if (ret != -1 || errno != ECHILD)
FAIL_EXIT1 ("waitpid: %m)");
TEST_COMPARE (WAITID (P_ALL, 0, NULL, WEXITED), -1);
TEST_COMPARE (errno, ECHILD);
return 0;
}

93
posix/tst-spawn3.c
View File

@ -27,9 +27,12 @@
#include <sys/resource.h>
#include <fcntl.h>
#include <paths.h>
#include <intprops.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
#include <tst-spawn.h>
static int
do_test (void)
@ -48,7 +51,6 @@ do_test (void)
struct rlimit rl;
int max_fd = 24;
int ret;
/* Set maximum number of file descriptor to a low value to avoid open
too many files in environments where RLIMIT_NOFILE is large and to
@ -66,7 +68,7 @@ do_test (void)
/* Exhauste the file descriptor limit with temporary files. */
int files[max_fd];
int nfiles = 0;
for (;;)
for (; nfiles < max_fd; nfiles++)
{
int fd = create_temp_file ("tst-spawn3.", NULL);
if (fd == -1)
@ -75,75 +77,82 @@ do_test (void)
FAIL_EXIT1 ("create_temp_file: %m");
break;
}
files[nfiles++] = fd;
files[nfiles] = fd;
}
TEST_VERIFY_EXIT (nfiles != 0);
posix_spawn_file_actions_t a;
if (posix_spawn_file_actions_init (&a) != 0)
FAIL_EXIT1 ("posix_spawn_file_actions_init");
TEST_COMPARE (posix_spawn_file_actions_init (&a), 0);
/* Executes a /bin/sh echo $$ 2>&1 > ${objpfx}tst-spawn3.pid . */
const char pidfile[] = OBJPFX "tst-spawn3.pid";
if (posix_spawn_file_actions_addopen (&a, STDOUT_FILENO, pidfile, O_WRONLY
| O_CREAT | O_TRUNC, 0644) != 0)
FAIL_EXIT1 ("posix_spawn_file_actions_addopen");
TEST_COMPARE (posix_spawn_file_actions_addopen (&a, STDOUT_FILENO, pidfile,
O_WRONLY| O_CREAT | O_TRUNC,
0644),
0);
if (posix_spawn_file_actions_adddup2 (&a, STDOUT_FILENO, STDERR_FILENO) != 0)
FAIL_EXIT1 ("posix_spawn_file_actions_adddup2");
TEST_COMPARE (posix_spawn_file_actions_adddup2 (&a, STDOUT_FILENO,
STDERR_FILENO),
0);
/* Since execve (called by posix_spawn) might require to open files to
actually execute the shell script, setup to close the temporary file
descriptors. */
for (int i=0; i<nfiles; i++)
{
if (posix_spawn_file_actions_addclose (&a, files[i]))
FAIL_EXIT1 ("posix_spawn_file_actions_addclose");
}
int maxnfiles =
#ifdef TST_SPAWN_PIDFD
/* The sparing file descriptor will be returned as the pid descriptor,
otherwise clone fail with EMFILE. */
nfiles - 1;
#else
nfiles;
#endif
for (int i=0; i<maxnfiles; i++)
TEST_COMPARE (posix_spawn_file_actions_addclose (&a, files[i]), 0);
char *spawn_argv[] = { (char *) _PATH_BSHELL, (char *) "-c",
(char *) "echo $$", NULL };
pid_t pid;
if ((ret = posix_spawn (&pid, _PATH_BSHELL, &a, NULL, spawn_argv, NULL))
!= 0)
PID_T_TYPE pid;
{
errno = ret;
FAIL_EXIT1 ("posix_spawn: %m");
int r = POSIX_SPAWN (&pid, _PATH_BSHELL, &a, NULL, spawn_argv, NULL);
if (r == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support CLONE_PIDFD clone flag");
#ifdef TST_SPAWN_PIDFD
TEST_COMPARE (r, EMFILE);
/* Free up one file descriptor, so posix_spawn_pidfd_ex can return it. */
xclose (files[nfiles-1]);
nfiles--;
r = POSIX_SPAWN (&pid, _PATH_BSHELL, &a, NULL, spawn_argv, NULL);
#endif
TEST_COMPARE (r, 0);
}
int status;
int err = waitpid (pid, &status, 0);
if (err != pid)
FAIL_EXIT1 ("waitpid: %m");
siginfo_t sinfo;
TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
/* Close the temporary files descriptor so it can check posix_spawn
output. */
for (int i=0; i<nfiles; i++)
{
if (close (files[i]))
FAIL_EXIT1 ("close: %m");
}
xclose (files[i]);
int pidfd = open (pidfile, O_RDONLY);
if (pidfd == -1)
FAIL_EXIT1 ("open: %m");
int pidfd = xopen (pidfile, O_RDONLY, 0);
char buf[64];
ssize_t n;
if ((n = read (pidfd, buf, sizeof (buf))) < 0)
FAIL_EXIT1 ("read: %m");
char buf[INT_BUFSIZE_BOUND (pid_t)];
ssize_t n = read (pidfd, buf, sizeof (buf));
TEST_VERIFY (n < sizeof buf && n >= 0);
unlink (pidfile);
xunlink (pidfile);
/* We only expect to read the PID. */
char *endp;
long int rpid = strtol (buf, &endp, 10);
if (*endp != '\n')
FAIL_EXIT1 ("*endp != \'n\'");
if (endp == buf)
FAIL_EXIT1 ("read empty line");
TEST_VERIFY (*endp == '\n' && endp != buf);
if (rpid != pid)
FAIL_EXIT1 ("found \"%s\", expected pid %ld\n", buf, (long int) pid);
TEST_COMPARE (rpid, sinfo.si_pid);
return 0;
}

7
posix/tst-spawn4.c
View File

@ -24,6 +24,7 @@
#include <support/xunistd.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <tst-spawn.h>
static int
do_test (void)
@ -38,15 +39,15 @@ do_test (void)
TEST_VERIFY_EXIT (chmod (scriptname, 0x775) == 0);
pid_t pid;
PID_T_TYPE pid;
int status;
/* Check if scripts without shebang are correctly not executed. */
status = posix_spawn (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
status = POSIX_SPAWN (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
(char *[]) { 0 });
TEST_VERIFY_EXIT (status == ENOEXEC);
status = posix_spawnp (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
status = POSIX_SPAWNP (&pid, scriptname, NULL, NULL, (char *[]) { 0 },
(char *[]) { 0 });
TEST_VERIFY_EXIT (status == ENOEXEC);

14
posix/tst-spawn5.c
View File

@ -33,6 +33,7 @@
#include <arch-fd_to_filename.h>
#include <array_length.h>
#include <tst-spawn.h>
/* Nonzero if the program gets called via `exec'. */
static int restart;
@ -161,14 +162,13 @@ spawn_closefrom_test (posix_spawn_file_actions_t *fa, int lowfd, int highfd,
args[argc] = NULL;
TEST_VERIFY (argc < argv_size);
pid_t pid;
int status;
PID_T_TYPE pid;
siginfo_t sinfo;
TEST_COMPARE (posix_spawn (&pid, args[0], fa, NULL, args, environ), 0);
TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
TEST_COMPARE (POSIX_SPAWN (&pid, args[0], fa, NULL, args, environ), 0);
TEST_COMPARE (WAITID (P_PID, pid, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
}
static void

13
posix/tst-spawn6.c
View File

@ -32,6 +32,7 @@
#include <sys/ioctl.h>
#include <stdlib.h>
#include <termios.h>
#include <tst-spawn.h>
#ifndef PATH_MAX
# define PATH_MAX 1024
@ -108,17 +109,15 @@ run_subprogram (int argc, char *argv[], const posix_spawnattr_t *attr,
spargv[i] = NULL;
pid_t pid;
TEST_COMPARE (posix_spawn (&pid, argv[1], actions, attr, spargv, environ),
TEST_COMPARE (POSIX_SPAWN (&pid, argv[1], actions, attr, spargv, environ),
exp_err);
if (exp_err != 0)
return;
int status;
TEST_COMPARE (xwaitpid (pid, &status, WUNTRACED), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSTOPPED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
siginfo_t sinfo;
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
}
static int

13
posix/tst-spawn7.c
View File

@ -24,7 +24,9 @@
#include <support/check.h>
#include <support/xsignal.h>
#include <support/xunistd.h>
#include <sys/wait.h>
#include <unistd.h>
#include <tst-spawn.h>
/* Nonzero if the program gets called via `exec'. */
#define CMDLINE_OPTIONS \
@ -81,14 +83,13 @@ spawn_signal_test (const char *type, const posix_spawnattr_t *attr)
{
spargs[check_type_argc] = (char*) type;
pid_t pid;
int status;
PID_T_TYPE pid;
siginfo_t sinfo;
TEST_COMPARE (posix_spawn (&pid, spargs[0], NULL, attr, spargs, environ), 0);
TEST_COMPARE (xwaitpid (pid, &status, 0), pid);
TEST_VERIFY (WIFEXITED (status));
TEST_VERIFY (!WIFSIGNALED (status));
TEST_COMPARE (WEXITSTATUS (status), 0);
TEST_COMPARE (WAITID (P_ALL, 0, &sinfo, WEXITED), 0);
TEST_COMPARE (sinfo.si_code, CLD_EXITED);
TEST_COMPARE (sinfo.si_status, 0);
}
static void

18
sysdeps/unix/sysv/linux/Makefile
View File

@ -62,6 +62,7 @@ sysdep_routines += \
clock_adjtime \
clone \
clone-internal \
clone-pidfd-support \
clone3 \
closefrom_fallback \
convert_scm_timestamps \
@ -492,6 +493,8 @@ sysdep_headers += \
sysdep_routines += \
getcpu \
oldglob \
pidfd_spawn \
pidfd_spawnp \
sched_getcpu \
spawnattr_getcgroup_np \
spawnattr_setcgroup_np \
@ -500,7 +503,16 @@ sysdep_routines += \
tests += \
tst-affinity \
tst-affinity-pid \
tst-posix_spawn-setsid-pidfd \
tst-spawn-cgroup \
tst-spawn-chdir-pidfd \
tst-spawn-pidfd \
tst-spawn2-pidfd \
tst-spawn3-pidfd \
tst-spawn4-pidfd \
tst-spawn5-pidfd \
tst-spawn6-pidfd \
tst-spawn7-pidfd \
# tests
tests-static += \
@ -514,8 +526,14 @@ tests += \
CFLAGS-fork.c = $(libio-mtsafe)
CFLAGS-getpid.o = -fomit-frame-pointer
CFLAGS-getpid.os = -fomit-frame-pointer
CFLAGS-tst-spawn3-pidfd.c += -DOBJPFX=\"$(objpfx)\"
tst-spawn-cgroup-ARGS = -- $(host-test-program-cmd)
tst-spawn-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn5-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn6-pidfd-ARGS = -- $(host-test-program-cmd)
tst-spawn7-pidfd-ARGS = -- $(host-test-program-cmd)
tst-posix_spawn-setsid-pidfd-ARGS = -- $(host-test-program-cmd)
endif
ifeq ($(subdir),inet)

2
sysdeps/unix/sysv/linux/Versions
View File

@ -322,6 +322,8 @@ libc {
%endif
}
GLIBC_2.39 {
pidfd_spawn;
pidfd_spawnp;
posix_spawnattr_getcgroup_np;
posix_spawnattr_setcgroup_np;
}

2
sysdeps/unix/sysv/linux/aarch64/libc.abilist
View File

@ -2673,5 +2673,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/alpha/libc.abilist
View File

@ -2782,6 +2782,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/arc/libc.abilist
View File

@ -2434,5 +2434,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/arm/be/libc.abilist
View File

@ -554,6 +554,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _Exit F

2
sysdeps/unix/sysv/linux/arm/le/libc.abilist
View File

@ -551,6 +551,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _Exit F

27
sysdeps/unix/sysv/linux/bits/spawn_ext.h
View File

@ -35,6 +35,33 @@ extern int posix_spawnattr_setcgroup_np (posix_spawnattr_t *__attr,
int __cgroup)
__THROW __nonnull ((1));
/* Spawn a new process executing PATH with the attributes describes in *ATTRP.
Before running the process perform the actions described in FACTS. Return
a PID file descriptor in PIDFD if process creation was successful and the
argument is non-null.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern int pidfd_spawn (int *__restrict __pidfd,
const char *__restrict __path,
const posix_spawn_file_actions_t *__restrict __facts,
const posix_spawnattr_t *__restrict __attrp,
char *const __argv[__restrict_arr],
char *const __envp[__restrict_arr])
__nonnull ((2, 5));
/* Similar to `pidfd_spawn' but search for FILE in the PATH.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern int pidfd_spawnp (int *__restrict __pidfd,
const char *__restrict __file,
const posix_spawn_file_actions_t *__restrict __facts,
const posix_spawnattr_t *__restrict __attrp,
char *const __argv[__restrict_arr],
char *const __envp[__restrict_arr])
__nonnull ((1, 2, 5));
#endif /* __USE_MISC */
__END_DECLS

60
sysdeps/unix/sysv/linux/clone-pidfd-support.c Normal file
View File

@ -0,0 +1,60 @@
/* Check if kernel supports PID file descriptors.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <atomic.h>
#include <sys/wait.h>
#include <sysdep.h>
/* The PID file descriptors was added during multiple releases:
- Linux 5.2 added CLONE_PIDFD support for clone and __clone_pidfd_supported
syscall.
- Linux 5.3 added support for poll and CLONE_PIDFD for clone3.
- Linux 5.4 added P_PIDFD support on waitid.
For internal usage on spawn and fork, it only make sense to return a file
descriptor if caller can actually waitid on it. */
static int __waitid_pidfd_supported = 0;
bool
__clone_pidfd_supported (void)
{
int state = atomic_load_relaxed (&__waitid_pidfd_supported);
if (state == 0)
{
/* Linux define the maximum allocated file descriptor value as
0x7fffffc0 (from fs/file.c):
#define __const_min(x, y) ((x) < (y) ? (x) : (y))
unsigned int sysctl_nr_open_max =
__const_min(INT_MAX, ~(size_t)0/sizeof(void *)) & -BITS_PER_LONG;
So we can detect whether kernel supports all pidfd interfaces by
using a valid but never allocated file descriptor: if is not
supported waitid will return EINVAL, otherwise EBADF.
Also the waitid is a cancellation entrypoint, so issue the syscall
directly. */
int r = INTERNAL_SYSCALL_CALL (waitid, P_PIDFD, INT_MAX, NULL,
WEXITED | WNOHANG);
state = r == -EBADF ? 1 : -1;
atomic_store_relaxed (&__waitid_pidfd_supported, state);
}
return state > 0;
}

2
sysdeps/unix/sysv/linux/csky/libc.abilist
View File

@ -2710,5 +2710,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/hppa/libc.abilist
View File

@ -2659,6 +2659,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/i386/libc.abilist
View File

@ -2843,6 +2843,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/ia64/libc.abilist
View File

@ -2608,6 +2608,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist
View File

@ -2194,5 +2194,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
View File

@ -555,6 +555,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _Exit F

2
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
View File

@ -2786,6 +2786,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
View File

@ -2759,5 +2759,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
View File

@ -2756,5 +2756,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
View File

@ -2751,6 +2751,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
View File

@ -2749,6 +2749,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
View File

@ -2757,6 +2757,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
View File

@ -2659,6 +2659,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/nios2/libc.abilist
View File

@ -2798,5 +2798,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/or1k/libc.abilist
View File

@ -2180,5 +2180,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

30
sysdeps/unix/sysv/linux/pidfd_spawn.c Normal file
View File

@ -0,0 +1,30 @@
/* pidfd_spawn - Spawn a process and return a PID file descriptor.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <spawn.h>
#include "spawn_int.h"
int
pidfd_spawn (int *pidfd, const char *path,
const posix_spawn_file_actions_t *file_actions,
const posix_spawnattr_t *attrp, char *const argv[],
char *const envp[])
{
return __spawni (pidfd, path, file_actions, attrp, argv, envp,
SPAWN_XFLAGS_RET_PIDFD);
}

30
sysdeps/unix/sysv/linux/pidfd_spawnp.c Normal file
View File

@ -0,0 +1,30 @@
/* pidfd_spawnp - Spawn a process and return a PID file descriptor.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <spawn.h>
#include "spawn_int.h"
int
pidfd_spawnp (int *pidfd, const char *path,
const posix_spawn_file_actions_t *file_actions,
const posix_spawnattr_t *attrp, char *const argv[],
char *const envp[])
{
return __spawni (pidfd, path, file_actions, attrp, argv, envp,
SPAWN_XFLAGS_USE_PATH | SPAWN_XFLAGS_RET_PIDFD);
}

2
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
View File

@ -2825,6 +2825,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
View File

@ -2858,6 +2858,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
View File

@ -2579,6 +2579,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
View File

@ -2893,5 +2893,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
View File

@ -2436,5 +2436,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
View File

@ -2636,5 +2636,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F

2
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
View File

@ -2823,6 +2823,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
View File

@ -2616,6 +2616,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/sh/be/libc.abilist
View File

@ -2666,6 +2666,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/sh/le/libc.abilist
View File

@ -2663,6 +2663,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
View File

@ -2818,6 +2818,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 _IO_fprintf F

2
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
View File

@ -2631,6 +2631,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

24
sysdeps/unix/sysv/linux/spawni.c
View File

@ -68,6 +68,7 @@ struct posix_spawn_args
int xflags;
bool use_clone3;
int err;
int pidfd;
};
/* Older version requires that shell script without shebang definition
@ -309,7 +310,7 @@ fail:
/* Spawn a new process executing PATH with the attributes describes in *ATTRP.
Before running the process perform the actions described in FILE-ACTIONS. */
static int
__spawnix (pid_t * pid, const char *file,
__spawnix (int *pid, const char *file,
const posix_spawn_file_actions_t * file_actions,
const posix_spawnattr_t * attrp, char *const argv[],
char *const envp[], int xflags,
@ -319,6 +320,17 @@ __spawnix (pid_t * pid, const char *file,
struct posix_spawn_args args;
int ec;
bool use_pidfd = xflags & SPAWN_XFLAGS_RET_PIDFD;
/* For CLONE_PIDFD, older kernels might not fail with unsupported flags or
some versions might not support waitid (P_PIDFD). So to avoid the need
to handle the error on the helper process, check for full pidfd
support.
ENOSYS is returned because without proper waitid support, pidfd_spawn
can not be used proporly independently of its arguments. */
if (use_pidfd && !__clone_pidfd_supported ())
return ENOSYS;
/* To avoid imposing hard limits on posix_spawn{p} the total number of
arguments is first calculated to allocate a mmap to hold all possible
values. */
@ -368,6 +380,7 @@ __spawnix (pid_t * pid, const char *file,
args.argv = argv;
args.argc = argc;
args.envp = envp;
args.pidfd = 0;
args.xflags = xflags;
internal_signal_block_all (&args.oldmask);
@ -386,13 +399,18 @@ __spawnix (pid_t * pid, const char *file,
/* Unsupported flags like CLONE_CLEAR_SIGHAND will be cleared up by
__clone_internal_fallback. */
.flags = (set_cgroup ? CLONE_INTO_CGROUP : 0)
| (use_pidfd ? CLONE_PIDFD : 0)
| CLONE_CLEAR_SIGHAND
| CLONE_VM
| CLONE_VFORK,
.exit_signal = SIGCHLD,
.stack = (uintptr_t) stack,
.stack_size = stack_size,
.cgroup = (set_cgroup ? attrp->__cgroup : 0)
.cgroup = (set_cgroup ? attrp->__cgroup : 0),
.pidfd = use_pidfd ? (uintptr_t) &args.pidfd : 0,
/* This is require for clone fallback, where pidfd is returned
on parent_tid. */
.parent_tid = use_pidfd ? (uintptr_t) &args.pidfd : 0,
};
#ifdef HAVE_CLONE3_WRAPPER
args.use_clone3 = true;
@ -445,7 +463,7 @@ __spawnix (pid_t * pid, const char *file,
__munmap (stack, stack_size);
if ((ec == 0) && (pid != NULL))
*pid = new_pid;
*pid = use_pidfd ? args.pidfd : new_pid;
internal_signal_restore_set (&args.oldmask);

20
sysdeps/unix/sysv/linux/tst-posix_spawn-setsid-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-posix_spawn-setsid.c>

20
sysdeps/unix/sysv/linux/tst-spawn-chdir-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn-chdir.c>

20
sysdeps/unix/sysv/linux/tst-spawn-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn.c>

63
sysdeps/unix/sysv/linux/tst-spawn-pidfd.h Normal file
View File

@ -0,0 +1,63 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <spawn.h>
#include <support/check.h>
#define PID_T_TYPE int
/* Call posix_spawn with POSIX_SPAWN_PIDFD set. */
static inline int
pidfd_spawn_check (int *pidfd, const char *path,
const posix_spawn_file_actions_t *fa,
const posix_spawnattr_t *attr, char *const argv[],
char *const envp[])
{
int r = pidfd_spawn (pidfd, path, fa, attr, argv, envp);
if (r == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support CLONE_PIDFD clone flag");
return r;
}
#define POSIX_SPAWN(__pidfd, __path, __actions, __attr, __argv, __envp) \
pidfd_spawn_check (__pidfd, __path, __actions, __attr, __argv, __envp)
static inline int
pidfd_spawnp_check (int *pidfd, const char *file,
const posix_spawn_file_actions_t *fa,
const posix_spawnattr_t *attr,
char *const argv[], char *const envp[])
{
int r = pidfd_spawnp (pidfd, file, fa, attr, argv, envp);
if (r == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support CLONE_PIDFD clone flag");
return r;
}
#define POSIX_SPAWNP(__child, __path, __actions, __attr, __argv, __envp) \
pidfd_spawnp_check (__child, __path, __actions, __attr, __argv, __envp)
#define WAITID(__idtype, __id, __info, __opts) \
({ \
__typeof (__idtype) __new_idtype = __idtype == P_PID \
? P_PIDFD : __idtype; \
waitid (__new_idtype, __id, __info, __opts); \
})
#define TST_SPAWN_PIDFD 1

20
sysdeps/unix/sysv/linux/tst-spawn2-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn2.c>

20
sysdeps/unix/sysv/linux/tst-spawn3-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Check posix_spawn add file actions.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn3.c>

20
sysdeps/unix/sysv/linux/tst-spawn4-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn4.c>

20
sysdeps/unix/sysv/linux/tst-spawn5-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn5.c>

20
sysdeps/unix/sysv/linux/tst-spawn6-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn6.c>

20
sysdeps/unix/sysv/linux/tst-spawn7-pidfd.c Normal file
View File

@ -0,0 +1,20 @@
/* Tests for spawn pidfd extension.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <tst-spawn-pidfd.h>
#include <posix/tst-spawn7.c>

2
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
View File

@ -2582,6 +2582,8 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F
GLIBC_2.4 __confstr_chk F

2
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
View File

@ -2688,5 +2688,7 @@ GLIBC_2.38 strlcat F
GLIBC_2.38 strlcpy F
GLIBC_2.38 wcslcat F
GLIBC_2.38 wcslcpy F
GLIBC_2.39 pidfd_spawn F
GLIBC_2.39 pidfd_spawnp F
GLIBC_2.39 posix_spawnattr_getcgroup_np F
GLIBC_2.39 posix_spawnattr_setcgroup_np F