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-rw-r--r--sysdeps/unix/sysv/linux/tst-clone2.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-clone2.c b/sysdeps/unix/sysv/linux/tst-clone2.c
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index 0000000000..68a7e6d6e2
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+++ b/sysdeps/unix/sysv/linux/tst-clone2.c
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+/* Test if CLONE_VM does not change pthread pid/tid field (BZ #19957)
+   Copyright (C) 2016 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 <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 <sys/types.h>
+#include <sys/wait.h>
+
+#include <tls.h> /* for THREAD_* macros.  */
+
+static int sig;
+static int pipefd[2];
+
+static int
+f (void *a)
+{
+  close (pipefd[0]);
+
+  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
+  pid_t tid = THREAD_GETMEM (THREAD_SELF, tid);
+
+  while (write (pipefd[1], &pid, sizeof pid) < 0)
+    continue;
+  while (write (pipefd[1], &tid, sizeof tid) < 0)
+    continue;
+
+  return 0;
+}
+
+
+static int
+clone_test (int clone_flags)
+{
+  sig = SIGRTMIN;
+  sigset_t ss;
+  sigemptyset (&ss);
+  sigaddset (&ss, sig);
+  if (sigprocmask (SIG_BLOCK, &ss, NULL) != 0)
+    {
+      printf ("sigprocmask failed: %m\n");
+      return 1;
+    }
+
+  if (pipe2 (pipefd, O_CLOEXEC))
+    {
+      printf ("sigprocmask failed: %m\n");
+      return 1;
+    }
+
+  pid_t ppid = getpid ();
+
+#ifdef __ia64__
+  extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
+		       size_t __child_stack_size, int __flags,
+		       void *__arg, ...);
+  char st[256 * 1024] __attribute__ ((aligned));
+  pid_t p = __clone2 (f, st, sizeof (st), clone_flags, 0);
+#else
+  char st[128 * 1024] __attribute__ ((aligned));
+#if _STACK_GROWS_DOWN
+  pid_t p = clone (f, st + sizeof (st), clone_flags, 0);
+#elif _STACK_GROWS_UP
+  pid_t p = clone (f, st, clone_flags, 0);
+#else
+#error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
+#endif
+#endif
+  close (pipefd[1]);
+
+  if (p == -1)
+    {
+      printf ("clone failed: %m\n");
+      return 1;
+    }
+
+  pid_t pid, tid;
+  if (read (pipefd[0], &pid, sizeof pid) != sizeof pid)
+    {
+      printf ("read pid failed: %m\n");
+      kill (p, SIGKILL);
+      return 1;
+    }
+  if (read (pipefd[0], &tid, sizeof tid) != sizeof tid)
+    {
+      printf ("read pid failed: %m\n");
+      kill (p, SIGKILL);
+      return 1;
+    }
+
+  close (pipefd[0]);
+
+  int ret = 0;
+
+  /* For CLONE_VM glibc clone implementation does not change the pthread
+     pid/tid field.  */
+  if ((clone_flags & CLONE_VM) == CLONE_VM)
+    {
+      if ((ppid != pid) || (ppid != tid))
+	{
+	  printf ("parent pid (%i) != received pid/tid (%i/%i)\n",
+		  (int)ppid, (int)pid, (int)tid);
+	  ret = 1;
+	}
+    }
+  /* For any other flag clone updates the new pthread pid and tid with
+     the clone return value.  */
+  else
+    {
+      if ((p != pid) || (p != tid))
+	{
+	  printf ("child pid (%i) != received pid/tid (%i/%i)\n",
+		  (int)p, (int)pid, (int)tid);
+	  ret = 1;
+	}
+    }
+
+  int e;
+  if (waitpid (p, &e, __WCLONE) != p)
+    {
+      puts ("waitpid failed");
+      kill (p, SIGKILL);
+      return 1;
+    }
+  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;
+    }
+
+  return ret;
+}
+
+int
+do_test (void)
+{
+  /* First, check that the clone implementation, without any flag, updates
+     the struct pthread to contain the new PID and TID.  */
+  int ret = clone_test (0);
+  /* Second, check that with CLONE_VM the struct pthread PID and TID fields
+     remain unmodified after the clone.  Any modifications would cause problem
+     for the parent as described in bug 19957.  */
+  ret += clone_test (CLONE_VM);
+  return ret;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"