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Add static tests for __clone_internal

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Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu 2021-05-14 15:23:46 -07:00
parent 24c78e2c75
commit 84d40d702f
6 changed files with 509 additions and 0 deletions
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9
sysdeps/unix/sysv/linux/Makefile
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@ -139,6 +139,15 @@ tests-time64 += \
tst-sigtimedwait-time64 \
tst-timerfd-time64 \
tests-clone-internal = \
tst-align-clone-internal \
tst-clone2-internal \
tst-clone3-internal \
tst-getpid1-internal \
tst-misalign-clone-internal
tests-internal += $(tests-clone-internal)
tests-static += $(tests-clone-internal)
CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables
# Generate the list of SYS_* macros for the system calls (__NR_*

68
sysdeps/unix/sysv/linux/tst-align-clone-internal.c Normal file
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@ -0,0 +1,68 @@
/* Verify that the clone child stack is properly aligned.
Copyright (C) 2021 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 <sched.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <tst-stack-align.h>
#include <clone_internal.h>
#include <support/xunistd.h>
#include <support/check.h>
static int
f (void *arg)
{
puts ("in f");
return TEST_STACK_ALIGN () ? 1 : 0;
}
static int
do_test (void)
{
puts ("in main");
if (TEST_STACK_ALIGN ())
FAIL_EXIT1 ("stack alignment failed");
#ifdef __ia64__
# define STACK_SIZE 256 * 1024
#else
# define STACK_SIZE 128 * 1024
#endif
char st[STACK_SIZE] __attribute__ ((aligned));
struct clone_args clone_args =
{
.stack = (uintptr_t) st,
.stack_size = sizeof (st),
};
pid_t p = __clone_internal (&clone_args, f, 0);
TEST_VERIFY (p != -1);
int e;
xwaitpid (p, &e, __WCLONE);
TEST_VERIFY (WIFEXITED (e));
TEST_COMPARE (WEXITSTATUS (e), 0);
return 0;
}
#include <support/test-driver.c>

126
sysdeps/unix/sysv/linux/tst-clone2-internal.c Normal file
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@ -0,0 +1,126 @@
/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
Copyright (C) 2021 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 <sched.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <clone_internal.h>
#include <support/xunistd.h>
#include <support/check.h>
static int sig;
static int pipefd[2];
static int
f (void *a)
{
close (pipefd[0]);
pid_t ppid = getppid ();
pid_t pid = getpid ();
pid_t tid = gettid ();
if (write (pipefd[1], &ppid, sizeof ppid) != sizeof (ppid))
FAIL_EXIT1 ("write ppid failed\n");
if (write (pipefd[1], &pid, sizeof pid) != sizeof (pid))
FAIL_EXIT1 ("write pid failed\n");
if (write (pipefd[1], &tid, sizeof tid) != sizeof (tid))
FAIL_EXIT1 ("write tid failed\n");
return 0;
}
static int
do_test (void)
{
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
FAIL_EXIT1 ("sigprocmask failed: %m");
if (pipe2 (pipefd, O_CLOEXEC))
FAIL_EXIT1 ("pipe failed: %m");
#ifdef __ia64__
# define STACK_SIZE 256 * 1024
#else
# define STACK_SIZE 128 * 1024
#endif
char st[STACK_SIZE] __attribute__ ((aligned));
struct clone_args clone_args =
{
.stack = (uintptr_t) st,
.stack_size = sizeof (st),
};
pid_t p = __clone_internal (&clone_args, f, 0);
close (pipefd[1]);
if (p == -1)
FAIL_EXIT1("clone failed: %m");
pid_t ppid, pid, tid;
if (read (pipefd[0], &ppid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read ppid failed: %m");
}
if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read pid failed: %m");
}
if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
{
kill (p, SIGKILL);
FAIL_EXIT1 ("read tid failed: %m");
}
close (pipefd[0]);
pid_t own_pid = getpid ();
pid_t own_tid = syscall (__NR_gettid);
/* Some sanity checks for clone syscall: returned ppid should be current
pid and both returned tid/pid should be different from current one. */
if ((ppid != own_pid) || (pid == own_pid) || (tid == own_tid))
FAIL_RET ("ppid=%i pid=%i tid=%i | own_pid=%i own_tid=%i",
(int)ppid, (int)pid, (int)tid, (int)own_pid, (int)own_tid);
int e;
xwaitpid (p, &e, __WCLONE);
TEST_VERIFY (WIFEXITED (e));
TEST_COMPARE (WEXITSTATUS (e), 0);
return 0;
}
#include <support/test-driver.c>

99
sysdeps/unix/sysv/linux/tst-clone3-internal.c Normal file
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@ -0,0 +1,99 @@
/* Check if clone (CLONE_THREAD) does not call exit_group (BZ #21512)
Copyright (C) 2021 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 <string.h>
#include <sched.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <linux/futex.h>
#include <support/check.h>
#include <stdatomic.h>
#include <clone_internal.h>
/* Test if clone call with CLONE_THREAD does not call exit_group. The 'f'
function returns '1', which will be used by clone thread to call the
'exit' syscall directly. If _exit is used instead, exit_group will be
used and thus the thread group will finish with return value of '1'
(where '2' from main thread is expected.). */
static int
f (void *a)
{
return 1;
}
/* Futex wait for TID argument, similar to pthread_join internal
implementation. */
#define wait_tid(ctid_ptr, ctid_val) \
do { \
__typeof (*(ctid_ptr)) __tid; \
/* We need acquire MO here so that we synchronize with the \
kernel's store to 0 when the clone terminates. */ \
while ((__tid = atomic_load_explicit (ctid_ptr, \
memory_order_acquire)) != 0) \
futex_wait (ctid_ptr, ctid_val); \
} while (0)
static inline int
futex_wait (int *futexp, int val)
{
#ifdef __NR_futex
return syscall (__NR_futex, futexp, FUTEX_WAIT, val);
#else
return syscall (__NR_futex_time64, futexp, FUTEX_WAIT, val);
#endif
}
static int
do_test (void)
{
char st[1024] __attribute__ ((aligned));
int clone_flags = CLONE_THREAD;
/* Minimum required flags to used along with CLONE_THREAD. */
clone_flags |= CLONE_VM | CLONE_SIGHAND;
/* We will used ctid to call on futex to wait for thread exit. */
clone_flags |= CLONE_CHILD_CLEARTID;
/* Initialize with a known value. ctid is set to zero by the kernel after the
cloned thread has exited. */
#define CTID_INIT_VAL 1
pid_t ctid = CTID_INIT_VAL;
pid_t tid;
struct clone_args clone_args =
{
.flags = clone_flags & ~CSIGNAL,
.exit_signal = clone_flags & CSIGNAL,
.stack = (uintptr_t) st,
.stack_size = sizeof (st),
.child_tid = (uintptr_t) &ctid,
};
tid = __clone_internal (&clone_args, f, NULL);
if (tid == -1)
FAIL_EXIT1 ("clone failed: %m");
wait_tid (&ctid, CTID_INIT_VAL);
return 2;
}
#define EXPECTED_STATUS 2
#include <support/test-driver.c>

133
sysdeps/unix/sysv/linux/tst-getpid1-internal.c Normal file
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@ -0,0 +1,133 @@
/* Verify that the parent pid is unchanged by __clone_internal.
Copyright (C) 2021 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 <sched.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <clone_internal.h>
#include <support/xunistd.h>
#ifndef TEST_CLONE_FLAGS
#define TEST_CLONE_FLAGS 0
#endif
static int sig;
static int
f (void *a)
{
puts ("in f");
union sigval sival;
sival.sival_int = getpid ();
printf ("pid = %d\n", sival.sival_int);
if (sigqueue (getppid (), sig, sival) != 0)
return 1;
return 0;
}
static int
do_test (void)
{
int mypid = getpid ();
sig = SIGRTMIN;
sigset_t ss;
sigemptyset (&ss);
sigaddset (&ss, sig);
if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
{
printf ("sigprocmask failed: %m\n");
return 1;
}
#ifdef __ia64__
# define STACK_SIZE 256 * 1024
#else
# define STACK_SIZE 128 * 1024
#endif
char st[STACK_SIZE] __attribute__ ((aligned));
struct clone_args clone_args =
{
.flags = TEST_CLONE_FLAGS & ~CSIGNAL,
.exit_signal = TEST_CLONE_FLAGS & CSIGNAL,
.stack = (uintptr_t) st,
.stack_size = sizeof (st),
};
pid_t p = __clone_internal (&clone_args, f, 0);
if (p == -1)
{
printf("clone failed: %m\n");
return 1;
}
printf ("new thread: %d\n", (int) p);
siginfo_t si;
do
if (sigwaitinfo (&ss, &si) < 0)
{
printf("sigwaitinfo failed: %m\n");
kill (p, SIGKILL);
return 1;
}
while (si.si_signo != sig || si.si_code != SI_QUEUE);
int e;
xwaitpid (p, &e, __WCLONE);
if (!WIFEXITED (e))
{
if (WIFSIGNALED (e))
printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
else
puts ("did not terminate correctly");
return 1;
}
if (WEXITSTATUS (e) != 0)
{
printf ("exit code %d\n", WEXITSTATUS (e));
return 1;
}
if (si.si_int != (int) p)
{
printf ("expected PID %d, got si_int %d\n", (int) p, si.si_int);
kill (p, SIGKILL);
return 1;
}
if (si.si_pid != p)
{
printf ("expected PID %d, got si_pid %d\n", (int) p, (int) si.si_pid);
kill (p, SIGKILL);
return 1;
}
if (getpid () != mypid)
{
puts ("my PID changed");
return 1;
}
return 0;
}
#include <support/test-driver.c>

74
sysdeps/unix/sysv/linux/tst-misalign-clone-internal.c Normal file
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@ -0,0 +1,74 @@
/* Verify that __clone_internal properly aligns the child stack.
Copyright (C) 2021 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 <sched.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <libc-pointer-arith.h>
#include <tst-stack-align.h>
#include <clone_internal.h>
#include <support/xunistd.h>
#include <support/check.h>
static int
check_stack_alignment (void *arg)
{
puts ("in f");
return TEST_STACK_ALIGN () ? 1 : 0;
}
static int
do_test (void)
{
puts ("in do_test");
if (TEST_STACK_ALIGN ())
FAIL_EXIT1 ("stack isn't aligned\n");
#ifdef __ia64__
# define STACK_SIZE (256 * 1024)
#else
# define STACK_SIZE (128 * 1024)
#endif
char st[STACK_SIZE + 1];
/* NB: Align child stack to 1 byte. */
char *stack = PTR_ALIGN_UP (&st[0], 2) + 1;
struct clone_args clone_args =
{
.stack = (uintptr_t) stack,
.stack_size = STACK_SIZE,
};
pid_t p = __clone_internal (&clone_args, check_stack_alignment, 0);
/* Clone must not fail. */
TEST_VERIFY_EXIT (p != -1);
int e;
xwaitpid (p, &e, __WCLONE);
TEST_VERIFY (WIFEXITED (e));
TEST_COMPARE (WEXITSTATUS (e), 0);
return 0;
}
#include <support/test-driver.c>