fix fd leak prevention (#455450)

xsane-0.995-close-fds.patch

@@ -1,29 +1,80 @@
 diff -up xsane-0.995/src/xsane.c.close-fds xsane-0.995/src/xsane.c
 --- xsane-0.995/src/xsane.c.close-fds	2007-09-28 17:24:56.000000000 +0200
-+++ xsane-0.995/src/xsane.c	2008-07-15 17:48:17.000000000 +0200
++++ xsane-0.995/src/xsane.c	2008-07-18 16:10:30.000000000 +0200
-@@ -3681,6 +3681,8 @@ static void xsane_show_doc_via_nsr(GtkWi
+@@ -48,6 +48,8 @@
-  char *arg[5];
+ 
-  struct stat st;
+ #include <sys/wait.h>
-  char netscape_lock_path[PATH_MAX];
+ 
++#include <stdarg.h>
++
+ /* ---------------------------------------------------------------------------------------------------------------------- */
+ 
+ struct option long_options[] =
+@@ -3673,6 +3675,41 @@ static void xsane_show_gpl(GtkWidget *wi
+ 
+ /* ---------------------------------------------------------------------------------------------------------------------- */
+ 
++static void xsane_close_fds_for_exec(signed int first_fd_to_leave_open, ...)
++{
 + int open_max;
-+ int i;
++ signed int i;
- 
++
-   DBG(DBG_proc, "xsane_show_doc_via_nsr(%s)\n", name);
++ va_list ap;
- 
++ unsigned char *close_fds;
-@@ -3725,6 +3727,17 @@ static void xsane_show_doc_via_nsr(GtkWi
++
++  open_max = (int) sysconf (_SC_OPEN_MAX);
++
++  close_fds = malloc (open_max);
++
++  memset (close_fds, 1, open_max);
++
++  va_start (ap, first_fd_to_leave_open);
++
++  for (i = first_fd_to_leave_open; i >= 0; i = va_arg (ap, signed int)) {
++    if (i < open_max)
++      close_fds[i] = 0;
++  }
++
++  va_end (ap);
++
++  DBG(DBG_info, "closing unneeded file descriptors\n");
++
++  for (i = 0; i < open_max; i++) {
++    if (close_fds[i])
++      close (i);
++  }
++
++  free (close_fds);
++}
++
++/* ---------------------------------------------------------------------------------------------------------------------- */
++
+ static void xsane_show_doc_via_nsr(GtkWidget *widget, gpointer data) /* show via netscape remote */
+ {
+  char *name = (char *) data;
+@@ -3725,6 +3762,8 @@ static void xsane_show_doc_via_nsr(GtkWi
          ipc_file = fdopen(xsane.ipc_pipefd[1], "w");
        }
  
-+      open_max = (int) sysconf (_SC_OPEN_MAX);
++      xsane_close_fds_for_exec (1, 2, xsane.ipc_pipefd[1], -1);
-+
++
-+      DBG(DBG_info, "closing unneeded file descriptors\n");
+       DBG(DBG_info, "trying to change user id for new subprocess:\n");
-+
+       DBG(DBG_info, "old effective uid = %d\n", (int) geteuid());
-+      /* leave stdin, stdout, stderr alone */
+       setuid(getuid());
-+      for (i = 3; i < open_max; i++) {
+@@ -3767,6 +3806,8 @@ static void xsane_show_doc_via_nsr(GtkWi
-+          /* xsane.ipc_pipefd[0] is closed by now */
+         ipc_file = fdopen(xsane.ipc_pipefd[1], "w");
-+          if (i != xsane.ipc_pipefd[1])
+       }
-+              close (i);
+ 
-+      }
++      xsane_close_fds_for_exec (1, 2, xsane.ipc_pipefd[1], -1);
++
+       DBG(DBG_info, "trying to change user id for new subprocess:\n");
+       DBG(DBG_info, "old effective uid = %d\n", (int) geteuid());
+       setuid(getuid());
+@@ -3888,6 +3929,8 @@ static void xsane_show_doc(GtkWidget *wi
+         ipc_file = fdopen(xsane.ipc_pipefd[1], "w");
+       }
+ 
++      xsane_close_fds_for_exec (1, 2, xsane.ipc_pipefd[1], -1);
 +
        DBG(DBG_info, "trying to change user id for new subprocess:\n");
        DBG(DBG_info, "old effective uid = %d\n", (int) geteuid());

xsane.spec

@@ -3,7 +3,7 @@
 Name: xsane
 Summary: X Window System front-end for the SANE scanner interface
 Version: 0.995
-Release: 4%{?dist}
+Release: 5%{?dist}
 Source0: http://www.xsane.org/download/%{name}-%{version}.tar.gz
 Source1: xsane.desktop
 Source2: xsane.conf.in
@@ -107,6 +107,9 @@ fi
 %config(noreplace) %{_sysconfdir}/gimp/plugins.d/xsane.conf
 
 %changelog
+* Fri Jul 18 2008 Nils Philippsen <nphilipp@redhat.com> - 0.995-5
+- fix fd leak prevention (#455450)
+
 * Tue Jul 15 2008 Nils Philippsen <nphilipp@redhat.com> - 0.995-4
 - don't leak file descriptors to help browser process (#455450)