commit 7264278fbbdc1dc6c30fedc902d1337594aa6ff6
Author: Lennart Poettering <lennart@poettering.net>
Date:   Wed Mar 21 23:47:44 2012 +0100

    journal: PAGE_SIZE is not known on ppc and other archs
    
    Let's use NAME_MAX, as suggested by Dan Walsh

Index: b/src/journal/journald.c
===================================================================
--- a/src/journal/journald.c
+++ b/src/journal/journald.c
@@ -29,7 +29,6 @@
 #include <sys/ioctl.h>
 #include <linux/sockios.h>
 #include <sys/statvfs.h>
-#include <sys/user.h>
 
 #include <systemd/sd-journal.h>
 #include <systemd/sd-login.h>
@@ -2141,10 +2140,20 @@
                         size_t label_len = 0;
                         union {
                                 struct cmsghdr cmsghdr;
+
+                                /* We use NAME_MAX space for the
+                                 * SELinux label here. The kernel
+                                 * currently enforces no limit, but
+                                 * according to suggestions from the
+                                 * SELinux people this will change and
+                                 * it will probably be identical to
+                                 * NAME_MAX. For now we use that, but
+                                 * this should be updated one day when
+                                 * the final limit is known.*/
                                 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
                                             CMSG_SPACE(sizeof(struct timeval)) +
-                                            CMSG_SPACE(sizeof(int)) +
-                                            CMSG_SPACE(PAGE_SIZE)]; /* selinux label */
+                                            CMSG_SPACE(sizeof(int)) + /* fd */
+                                            CMSG_SPACE(NAME_MAX)]; /* selinux label */
                         } control;
                         ssize_t n;
                         int v;