Update.

1998-10-22  H.J. Lu  <hjl@gnu.org>

	* sysdeps/unix/sysv/linux/i386/getgroups.c (__getgroups): Add
	sanity check for n.
	* sysdeps/unix/sysv/linux/i386/setgroups.c (setgroups): Likewise.

	* sysdeps/posix/fpathconf.c (__fpathconf): Set errno to
	EINVAL if errno == ENODEV.  Tested by VSX-PCT.

	* sysdeps/posix/isatty.c (__isatty): Don't reset errno.  Tested
	by VSX-PCT.

	* posix/execvp.c (execvp): Check "".  Tested by VSX-PCT.

4 files changed, 45 insertions, 29 deletions

diff --git a/sysdeps/posix/fpathconf.c b/sysdeps/posix/fpathconf.c
index b73292bef0..94593bccca 100644
--- a/sysdeps/posix/fpathconf.c
+++ b/sysdeps/posix/fpathconf.c
@@ -72,9 +72,12 @@ __fpathconf (fd, name)
 	  {
 	    if (errno == ENOSYS)
 	      {
-		errno = save_errno;
+		__set_errno (save_errno);
 		return NAME_MAX;
 	      }
+	    else if (errno == ENODEV)
+	      __set_errno (EINVAL);
+
 	    return -1;
 	  }
 	else
diff --git a/sysdeps/posix/isatty.c b/sysdeps/posix/isatty.c
index 41d16e400a..d7a14990cc 100644
--- a/sysdeps/posix/isatty.c
+++ b/sysdeps/posix/isatty.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1995, 1996, 1997, 1998 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
@@ -16,7 +16,6 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
-#include <errno.h>
 #include <unistd.h>
 #include <termios.h>
 
@@ -25,15 +24,9 @@ int
 __isatty (fd)
      int fd;
 {
-  int save;
-  int is_tty;
   struct termios term;
 
-  save = errno;
-  is_tty = __tcgetattr (fd, &term) == 0;
-  __set_errno (save);
-
-  return is_tty;
+  return __tcgetattr (fd, &term) == 0;
 }
 
 weak_alias (__isatty, isatty)
diff --git a/sysdeps/unix/sysv/linux/i386/getgroups.c b/sysdeps/unix/sysv/linux/i386/getgroups.c
index c306dd1268..5484f72f1c 100644
--- a/sysdeps/unix/sysv/linux/i386/getgroups.c
+++ b/sysdeps/unix/sysv/linux/i386/getgroups.c
@@ -17,10 +17,13 @@
    Boston, MA 02111-1307, USA.  */
 
 #include <errno.h>
-#include <sys/types.h>
 #include <unistd.h>
+#include <sys/param.h>
+#include <sys/types.h>
 
 #include <sysdep.h>
+#include <sys/syscall.h>
+
 #include <linux/posix_types.h>
 
 extern int __syscall_getgroups __P ((int, __kernel_gid_t *));
@@ -32,14 +35,23 @@ __getgroups (n, groups)
      int n;
      gid_t *groups;
 {
-  int i, ngids;
-  __kernel_gid_t kernel_groups[n];
-
-  ngids = INLINE_SYSCALL (getgroups, 2, n, kernel_groups);
-  if (n != 0 && ngids > 0)
-    for (i = 0; i < ngids; i++)
-      groups[i] = kernel_groups[i];
-  return ngids;
+  if (n < 0)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+  else
+    {
+      int i, ngids;
+      __kernel_gid_t kernel_groups[n = MIN (n, __sysconf (_SC_NGROUPS_MAX))];
+
+      ngids = INLINE_SYSCALL (getgroups, 2, n, kernel_groups);
+      if (n != 0 && ngids > 0)
+	for (i = 0; i < ngids; i++)
+	  groups[i] = kernel_groups[i];
+
+      return ngids;
+    }
 }
 
 weak_alias (__getgroups, getgroups)
diff --git a/sysdeps/unix/sysv/linux/i386/setgroups.c b/sysdeps/unix/sysv/linux/i386/setgroups.c
index ad2a6b5493..67197e6f06 100644
--- a/sysdeps/unix/sysv/linux/i386/setgroups.c
+++ b/sysdeps/unix/sysv/linux/i386/setgroups.c
@@ -36,18 +36,26 @@ setgroups (n, groups)
      size_t n;
      const gid_t *groups;
 {
-  size_t i;
-  __kernel_gid_t kernel_groups[n];
-
-  for (i = 0; i < n; i++)
+  if (n < 0 || n > __sysconf (_SC_NGROUPS_MAX))
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+  else if
     {
-      kernel_groups[i] = groups[i];
-      if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i]))
+      size_t i;
+      __kernel_gid_t kernel_groups[n];
+
+      for (i = 0; i < n; i++)
 	{
-	  __set_errno (EINVAL);
-	  return -1;
+	  kernel_groups[i] = groups[i];
+	  if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i]))
+	    {
+	      __set_errno (EINVAL);
+	      return -1;
+	    }
 	}
-    }
 
-  return INLINE_SYSCALL (setgroups, 2, n, kernel_groups);
+      return INLINE_SYSCALL (setgroups, 2, n, kernel_groups);
+    }
 }