From: William Jon McCann <mccann@jhu.edu>
Date: Tue, 15 May 2007 15:15:12 +0000 (-0400)
Subject: a few fixes for getfd suggested by Lennart
X-Git-Url: http://gitweb.freedesktop.org/?p=ConsoleKit.git;a=commitdiff;h=17ff9ceb88e0b7f6dc5a7e6eac5ff98cb4a5cabe

a few fixes for getfd suggested by Lennart

I am currently investigating how to best integrate PulseAudio with
ConsoleKit/PolicyKit. While doing that I had a look on your code, and
found a few issues in getfd.c I'd like to report, before I forget
them. I couldn't find any bugzilla with at consolekit project (neither
fedora, nor fdo, nor gnome?) hence I am mailing you in person.

In getfd.c in open_a_console() a close() is missing if is_a_console is
missing.

The open() in open_a_console() should probably use O_NOCTTY. Otherwise
C-c on the console might end up in a SIGINT to your daemon process!

Also I'd add an isatty() check to is_a_console(), to makes sure that
you're actually talking to a TTY before you issue KDGKBTYPE on
it. ioctl()s are unfortunately not unique, hence i'd recommend that check.

That's it,

Lennart
---

--- a/src/getfd.c
+++ b/src/getfd.c
@@ -30,7 +30,8 @@ is_a_console (int fd)
     char arg;
 
     arg = 0;
-    return (ioctl (fd, KDGKBTYPE, &arg) == 0
+    return (isatty (fd)
+            && ioctl (fd, KDGKBTYPE, &arg) == 0
 	    && ((arg == KB_101) || (arg == KB_84)));
 }
 
@@ -39,11 +40,18 @@ open_a_console (char *fnam)
 {
     int fd;
 
-    fd = open (fnam, O_RDONLY);
+    fd = open (fnam, O_RDONLY | O_NOCTTY);
     if (fd < 0 && errno == EACCES)
-      fd = open(fnam, O_WRONLY);
-    if (fd < 0 || ! is_a_console (fd))
+      fd = open (fnam, O_WRONLY | O_NOCTTY);
+
+    if (fd < 0)
       return -1;
+
+    if (! is_a_console (fd)) {
+      close (fd);
+      fd = -1;
+    }
+
     return fd;
 }