diff -up Linux-PAM-1.0.91/modules/pam_mkhomedir/pam_mkhomedir.c.std-noclose Linux-PAM-1.0.91/modules/pam_mkhomedir/pam_mkhomedir.c
--- Linux-PAM-1.0.91/modules/pam_mkhomedir/pam_mkhomedir.c.std-noclose	2009-03-03 14:56:01.000000000 +0100
+++ Linux-PAM-1.0.91/modules/pam_mkhomedir/pam_mkhomedir.c	2009-03-26 10:02:15.000000000 +0100
@@ -131,13 +131,21 @@ create_homedir (pam_handle_t *pamh, int 
    if (child == 0) {
         int i;
         struct rlimit rlim;
+	int dummyfds[2];
 	static char *envp[] = { NULL };
 	char *args[] = { NULL, NULL, NULL, NULL, NULL };
 
+	/* replace std file descriptors with a dummy pipe */
+	if (pipe(dummyfds) == 0) {
+		dup2(dummyfds[0], STDIN_FILENO);
+		dup2(dummyfds[1], STDOUT_FILENO);
+		dup2(dummyfds[1], STDERR_FILENO);
+	}
+
 	if (getrlimit(RLIMIT_NOFILE, &rlim)==0) {
           if (rlim.rlim_max >= MAX_FD_NO)
                 rlim.rlim_max = MAX_FD_NO;
-	  for (i=0; i < (int)rlim.rlim_max; i++) {
+	  for (i = STDERR_FILENO + 1; i < (int)rlim.rlim_max; i++) {
 	  	close(i);
 	  }
 	}
diff -up Linux-PAM-1.0.91/modules/pam_unix/support.c.std-noclose Linux-PAM-1.0.91/modules/pam_unix/support.c
--- Linux-PAM-1.0.91/modules/pam_unix/support.c.std-noclose	2009-03-03 14:56:01.000000000 +0100
+++ Linux-PAM-1.0.91/modules/pam_unix/support.c	2009-03-26 10:08:59.000000000 +0100
@@ -443,13 +443,16 @@ static int _unix_run_helper_binary(pam_h
 
 	/* reopen stdin as pipe */
 	dup2(fds[0], STDIN_FILENO);
+	/* and replace also the stdout/err as the helper will
+           not write anything there */
+	dup2(fds[1], STDOUT_FILENO);
+	dup2(fds[1], STDERR_FILENO);
 
 	if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
           if (rlim.rlim_max >= MAX_FD_NO)
                 rlim.rlim_max = MAX_FD_NO;
-	  for (i=0; i < (int)rlim.rlim_max; i++) {
-		if (i != STDIN_FILENO)
-	  	   close(i);
+	  for (i = STDERR_FILENO + 1; i < (int)rlim.rlim_max; i++) {
+	  	close(i);
 	  }
 	}
 
diff -up Linux-PAM-1.0.91/modules/pam_unix/pam_unix_passwd.c.std-noclose Linux-PAM-1.0.91/modules/pam_unix/pam_unix_passwd.c
--- Linux-PAM-1.0.91/modules/pam_unix/pam_unix_passwd.c.std-noclose	2009-03-03 14:56:01.000000000 +0100
+++ Linux-PAM-1.0.91/modules/pam_unix/pam_unix_passwd.c	2009-03-26 10:07:06.000000000 +0100
@@ -175,13 +175,16 @@ static int _unix_run_update_binary(pam_h
 
 	/* reopen stdin as pipe */
 	dup2(fds[0], STDIN_FILENO);
+	/* and replace also the stdout/err as the helper will
+           not write anything there */
+	dup2(fds[1], STDOUT_FILENO);
+	dup2(fds[1], STDERR_FILENO);
 
 	if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
 	  if (rlim.rlim_max >= MAX_FD_NO)
 	    rlim.rlim_max = MAX_FD_NO;
-	  for (i=0; i < (int)rlim.rlim_max; i++) {
-	    if (i != STDIN_FILENO)
-	  	   close(i);
+	  for (i = STDERR_FILENO + 1; i < (int)rlim.rlim_max; i++) {
+	    close(i);
 	  }
 	}
 
diff -up Linux-PAM-1.0.91/modules/pam_unix/pam_unix_acct.c.std-noclose Linux-PAM-1.0.91/modules/pam_unix/pam_unix_acct.c
--- Linux-PAM-1.0.91/modules/pam_unix/pam_unix_acct.c.std-noclose	2009-03-03 14:56:01.000000000 +0100
+++ Linux-PAM-1.0.91/modules/pam_unix/pam_unix_acct.c	2009-03-26 10:05:41.000000000 +0100
@@ -100,16 +100,18 @@ int _unix_run_verify_binary(pam_handle_t
 
     /* reopen stdout as pipe */
     dup2(fds[1], STDOUT_FILENO);
+    /* and replace also the stdin, stderr so we do not exec the helper with
+       tty as stdin, it will not read anything from there anyway */
+    dup2(fds[0], STDIN_FILENO);
+    dup2(fds[1], STDERR_FILENO);
 
     /* XXX - should really tidy up PAM here too */
 
     if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
       if (rlim.rlim_max >= MAX_FD_NO)
         rlim.rlim_max = MAX_FD_NO;
-      for (i=0; i < (int)rlim.rlim_max; i++) {
-	if (i != STDOUT_FILENO) {
-	  close(i);
-	}
+      for (i = STDERR_FILENO + 1; i < (int)rlim.rlim_max; i++) {
+	close(i);
       }
     }