Update.

2005-01-20  Ulrich Drepper  <drepper@redhat.com>

	* posix/execl.c: Do not allocate potentially large buffers on the
	stack.
	* posix/execle.c: Likewise.
	* posix/execlp.c: Likewise.
	* posix/execlp.c: Likewise.
	(script_execute): Removed.
	(allocate_scripts_argv): New function.  Called at most once to
	allocate memory, not every time a script is run.  Adjust caller.

	* sysdeps/generic/wordexp.c (exec_comm): Add a few
	TEMP_FAILURE_RETRY.  Reorganize code to avoid multiple calls to
	exec_comm_child.
	(exec_comm_child): Can now be inlined.

	* posix/Makefile: Add -fomit-frame-pointer for a few more files.
	* stdlib/Makefile: Likewise.

5 files changed, 151 insertions, 116 deletions

diff --git a/posix/Makefile b/posix/Makefile
index bdd3e71..1fdb57c 100644
--- a/posix/Makefile
+++ b/posix/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-1999, 2000-2003, 2004 Free Software Foundation, Inc.
+# Copyright (C) 1991-1999, 2000-2003, 2004, 2005 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
@@ -138,17 +138,24 @@ CFLAGS-wait.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-waitid.c = -fexceptions
 CFLAGS-waitpid.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-getopt.c = -fexceptions
-CFLAGS-wordexp.c = -fexceptions
+CFLAGS-wordexp.c = -fexceptions -fomit-frame-pointer
 CFLAGS-sysconf.c = -fexceptions -DGETCONF_DIR='"$(libexecdir)/getconf"'
 CFLAGS-pathconf.c = -fexceptions
 CFLAGS-fpathconf.c = -fexceptions
-CFLAGS-spawn.c = -fexceptions
-CFLAGS-spawnp.c = -fexceptions
-CFLAGS-spawni.c = -fexceptions
+CFLAGS-spawn.c = -fexceptions -fomit-frame-pointer
+CFLAGS-spawnp.c = -fexceptions -fomit-frame-pointer
+CFLAGS-spawni.c = -fexceptions -fomit-frame-pointer
 CFLAGS-pause.c = -fexceptions
 CFLAGS-glob.c = $(uses-callbacks) -fexceptions
 CFLAGS-glob64.c = $(uses-callbacks) -fexceptions
 CFLAGS-getconf.c = -DGETCONF_DIR='"$(libexecdir)/getconf"'
+CFLAGS-execve.c = -fomit-frame-pointer
+CFLAGS-fexecve.c = -fomit-frame-pointer
+CFLAGS-execv.c = -fomit-frame-pointer
+CFLAGS-execle.c = -fomit-frame-pointer
+CFLAGS-execl.c = -fomit-frame-pointer
+CFLAGS-execvp.c = -fomit-frame-pointer
+CFLAGS-execlp.c = -fomit-frame-pointer
 
 tstgetopt-ARGS = -a -b -cfoobar --required foobar --optional=bazbug \
 		--none random --col --color --colour
diff --git a/posix/execl.c b/posix/execl.c
index 62fd45d..12b59f9 100644
--- a/posix/execl.c
+++ b/posix/execl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,92,94,97,98,99,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991,92,94,97,98,99,2002,2005 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
@@ -16,10 +16,10 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <alloca.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <stackinfo.h>
@@ -33,46 +33,44 @@
 int
 execl (const char *path, const char *arg, ...)
 {
-  size_t argv_max = 1024;
-  const char **argv = alloca (argv_max * sizeof (const char *));
-  unsigned int i;
+#define INITIAL_ARGV_MAX 1024
+  size_t argv_max = INITIAL_ARGV_MAX;
+  const char *initial_argv[INITIAL_ARGV_MAX];
+  const char **argv = initial_argv;
   va_list args;
 
   argv[0] = arg;
 
   va_start (args, arg);
-  i = 0;
+  unsigned int i = 0;
   while (argv[i++] != NULL)
     {
       if (i == argv_max)
 	{
-	  const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
-
-#ifndef _STACK_GROWS_UP
-	  if ((char *) nptr + argv_max == (char *) argv)
+	  argv_max *= 2;
+	  const char **nptr = realloc (argv == initial_argv ? NULL : argv,
+				       argv_max * sizeof (const char *));
+	  if (nptr == NULL)
 	    {
-	      /* Stack grows down.  */
-	      argv = (const char **) memcpy (nptr, argv,
-					     i * sizeof (const char *));
-	      argv_max += i;
+	      if (argv != initial_argv)
+		free (argv);
+	      return -1;
 	    }
-	  else
-#endif
-#ifndef _STACK_GROWS_DOWN
-	    if ((char *) argv + i == (char *) nptr)
-	    /* Stack grows up.  */
-	    argv_max += i;
-	  else
-#endif
-	    /* We have a hole in the stack.  */
-	    argv = (const char **) memcpy (nptr, argv,
-					   i * sizeof (const char *));
+	  if (argv == initial_argv)
+	    /* We have to copy the already filled-in data ourselves.  */
+	    memcpy (nptr, argv, i * sizeof (const char *));
+
+	  argv = nptr;
 	}
 
       argv[i] = va_arg (args, const char *);
     }
   va_end (args);
 
-  return __execve (path, (char *const *) argv, __environ);
+  int ret = __execve (path, (char *const *) argv, __environ);
+  if (argv != initial_argv)
+    free (argv);
+
+  return ret;
 }
 libc_hidden_def (execl)
diff --git a/posix/execle.c b/posix/execle.c
index 2199ebe..70522ad 100644
--- a/posix/execle.c
+++ b/posix/execle.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,97,98,99,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991,97,98,99,2002,2005 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
@@ -16,10 +16,10 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <alloca.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <stackinfo.h>
@@ -29,48 +29,45 @@
 int
 execle (const char *path, const char *arg, ...)
 {
-  size_t argv_max = 1024;
-  const char **argv = alloca (argv_max * sizeof (const char *));
-  const char *const *envp;
-  unsigned int i;
+#define INITIAL_ARGV_MAX 1024
+  size_t argv_max = INITIAL_ARGV_MAX;
+  const char *initial_argv[INITIAL_ARGV_MAX];
+  const char **argv = initial_argv;
   va_list args;
   argv[0] = arg;
 
   va_start (args, arg);
-  i = 0;
+  unsigned int i = 0;
   while (argv[i++] != NULL)
     {
       if (i == argv_max)
 	{
-	  const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
-
-#ifndef _STACK_GROWS_UP
-	  if ((char *) nptr + argv_max == (char *) argv)
+	  argv_max *= 2;
+	  const char **nptr = realloc (argv == initial_argv ? NULL : argv,
+				       argv_max * sizeof (const char *));
+	  if (nptr == NULL)
 	    {
-	      /* Stack grows down.  */
-	      argv = (const char **) memcpy (nptr, argv,
-					     i * sizeof (const char *));
-	      argv_max += i;
+	      if (argv != initial_argv)
+		free (argv);
+	      return -1;
 	    }
-	  else
-#endif
-#ifndef _STACK_GROWS_DOWN
-	    if ((char *) argv + i == (char *) nptr)
-	    /* Stack grows up.  */
-	    argv_max += i;
-	  else
-#endif
-	    /* We have a hole in the stack.  */
-	    argv = (const char **) memcpy (nptr, argv,
-					   i * sizeof (const char *));
+	  if (argv == initial_argv)
+	    /* We have to copy the already filled-in data ourselves.  */
+	    memcpy (nptr, argv, i * sizeof (const char *));
+
+	  argv = nptr;
 	}
 
       argv[i] = va_arg (args, const char *);
     }
 
-  envp = va_arg (args, const char *const *);
+  const char *const *envp = va_arg (args, const char *const *);
   va_end (args);
 
-  return __execve (path, (char *const *) argv, (char *const *) envp);
+  int ret = __execve (path, (char *const *) argv, (char *const *) envp);
+  if (argv != initial_argv)
+    free (argv);
+
+  return ret;
 }
 libc_hidden_def (execle)
diff --git a/posix/execlp.c b/posix/execlp.c
index ba8fc74..66996a9 100644
--- a/posix/execlp.c
+++ b/posix/execlp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,93,96,97,98,99,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991,93,96,97,98,99,2002,2005 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
@@ -16,10 +16,10 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <alloca.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <stackinfo.h>
@@ -30,46 +30,44 @@
 int
 execlp (const char *file, const char *arg, ...)
 {
-  size_t argv_max = 1024;
-  const char **argv = alloca (argv_max * sizeof (const char *));
-  unsigned int i;
+#define INITIAL_ARGV_MAX 1024
+  size_t argv_max = INITIAL_ARGV_MAX;
+  const char *initial_argv[INITIAL_ARGV_MAX];
+  const char **argv = initial_argv;
   va_list args;
 
   argv[0] = arg;
 
   va_start (args, arg);
-  i = 0;
+  unsigned int i = 0;
   while (argv[i++] != NULL)
     {
       if (i == argv_max)
 	{
-	  const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
-
-#ifndef _STACK_GROWS_UP
-	  if ((char *) nptr + argv_max == (char *) argv)
+	  argv_max *= 2;
+	  const char **nptr = realloc (argv == initial_argv ? NULL : argv,
+				       argv_max * sizeof (const char *));
+	  if (nptr == NULL)
 	    {
-	      /* Stack grows down.  */
-	      argv = (const char **) memcpy (nptr, argv,
-					     i * sizeof (const char *));
-	      argv_max += i;
+	      if (argv != initial_argv)
+		free (argv);
+	      return -1;
 	    }
-	  else
-#endif
-#ifndef _STACK_GROWS_DOWN
-	    if ((char *) argv + i == (char *) nptr)
-	    /* Stack grows up.  */
-	    argv_max += i;
-	  else
-#endif
-	    /* We have a hole in the stack.  */
-	    argv = (const char **) memcpy (nptr, argv,
-					   i * sizeof (const char *));
+	  if (argv == initial_argv)
+	    /* We have to copy the already filled-in data ourselves.  */
+	    memcpy (nptr, argv, i * sizeof (const char *));
+
+	  argv = nptr;
 	}
 
       argv[i] = va_arg (args, const char *);
     }
   va_end (args);
 
-  return execvp (file, (char *const *) argv);
+  int ret = execvp (file, (char *const *) argv);
+  if (argv != initial_argv)
+    free (argv);
+
+  return ret;
 }
 libc_hidden_def (execlp)
diff --git a/posix/execvp.c b/posix/execvp.c
index d6f60c0..d8dce7a 100644
--- a/posix/execvp.c
+++ b/posix/execvp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,92,1995-99,2002,2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991,92,1995-99,2002,2004,2005 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
@@ -26,9 +26,9 @@
 
 /* The file is accessible but it is not an executable file.  Invoke
    the shell to interpret it as a script.  */
-static void
+static char **
 internal_function
-script_execute (const char *file, char *const argv[])
+allocate_scripts_argv (const char *file, char *const argv[])
 {
   /* Count the arguments.  */
   int argc = 0;
@@ -36,19 +36,19 @@ script_execute (const char *file, char *const argv[])
     ;
 
   /* Construct an argument list for the shell.  */
-  {
-    char *new_argv[argc + 1];
-    new_argv[0] = (char *) _PATH_BSHELL;
-    new_argv[1] = (char *) file;
-    while (argc > 1)
-      {
-	new_argv[argc] = argv[argc - 1];
-	--argc;
-      }
-
-    /* Execute the shell.  */
-    __execve (new_argv[0], new_argv, __environ);
-  }
+  char **new_argv = (char **) malloc ((argc + 1) * sizeof (char *));
+  if (new_argv != NULL)
+    {
+      new_argv[0] = (char *) _PATH_BSHELL;
+      new_argv[1] = (char *) file;
+      while (argc > 1)
+	{
+	  new_argv[argc] = argv[argc - 1];
+	  --argc;
+	}
+    }
+
+  return new_argv;
 }
 
 
@@ -66,42 +66,58 @@ execvp (file, argv)
       return -1;
     }
 
+  char **script_argv = NULL;
+
   if (strchr (file, '/') != NULL)
     {
       /* Don't search when it contains a slash.  */
       __execve (file, argv, __environ);
 
       if (errno == ENOEXEC)
-	script_execute (file, argv);
+	{
+	  script_argv = allocate_scripts_argv (file, argv);
+	  if (script_argv != NULL)
+	    {
+	      __execve (script_argv[0], script_argv, __environ);
+
+	      free (script_argv);
+	    }
+	}
     }
   else
     {
-      int got_eacces = 0;
-      char *path, *p, *name;
-      size_t len;
-      size_t pathlen;
-
-      path = getenv ("PATH");
+      char *path = getenv ("PATH");
+      bool path_malloc = false;
       if (path == NULL)
 	{
 	  /* There is no `PATH' in the environment.
 	     The default search path is the current directory
 	     followed by the path `confstr' returns for `_CS_PATH'.  */
-	  len = confstr (_CS_PATH, (char *) NULL, 0);
-	  path = (char *) __alloca (1 + len);
+	  size_t len = confstr (_CS_PATH, (char *) NULL, 0);
+	  path = (char *) malloc (1 + len);
+	  if (path == NULL)
+	    return -1;
 	  path[0] = ':';
 	  (void) confstr (_CS_PATH, path + 1, len);
+	  path_malloc = true;
 	}
 
-      len = strlen (file) + 1;
-      pathlen = strlen (path);
-      name = __alloca (pathlen + len + 1);
+      size_t len = strlen (file) + 1;
+      size_t pathlen = strlen (path);
+      char *name = malloc (pathlen + len + 1);
+      if (name == NULL)
+	{
+	  if (path_malloc)
+	    free (path);
+	  return -1;
+	}
       /* Copy the file name at the top.  */
       name = (char *) memcpy (name + pathlen + 1, file, len);
       /* And add the slash.  */
       *--name = '/';
 
-      p = path;
+      bool got_eacces = false;
+      char *p = path;
       do
 	{
 	  char *startp;
@@ -120,7 +136,21 @@ execvp (file, argv)
 	  __execve (startp, argv, __environ);
 
 	  if (errno == ENOEXEC)
-	    script_execute (startp, argv);
+	    {
+	      if (script_argv == NULL)
+		{
+		  script_argv = allocate_scripts_argv (file, argv);
+		  if (script_argv == NULL)
+		    {
+		      /* A possible EACCES error is not as important as
+			 the ENOMEM.  */
+		      got_eacces = false;
+		      break;
+		    }
+		}
+
+	      __execve (script_argv[0], script_argv, __environ);
+	    }
 
 	  switch (errno)
 	    {
@@ -128,7 +158,7 @@ execvp (file, argv)
 	      /* Record the we got a `Permission denied' error.  If we end
 		 up finding no executable we can use, we want to diagnose
 		 that we did find one but were denied access.  */
-	      got_eacces = 1;
+	      got_eacces = true;
 	    case ENOENT:
 	    case ESTALE:
 	    case ENOTDIR:
@@ -156,6 +186,11 @@ execvp (file, argv)
 	/* At least one failure was due to permissions, so report that
            error.  */
 	__set_errno (EACCES);
+
+      free (script_argv);
+      free (name);
+      if (path_malloc)
+	free (path);
     }
 
   /* Return the error from the last attempt (probably ENOENT).  */