diff options
Diffstat (limited to 'main/busybox/busybox-1.18.3-klogd.patch')
| -rw-r--r-- | main/busybox/busybox-1.18.3-klogd.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/main/busybox/busybox-1.18.3-klogd.patch b/main/busybox/busybox-1.18.3-klogd.patch new file mode 100644 index 0000000000..2272cd0030 --- /dev/null +++ b/main/busybox/busybox-1.18.3-klogd.patch @@ -0,0 +1,45 @@ +--- busybox-1.18.3/sysklogd/klogd.c ++++ busybox-1.18.3-klogd/sysklogd/klogd.c +@@ -150,12 +150,41 @@ int klogd_main(int argc UNUSED_PARAM, ch + */ + klogd_open(); + openlog("kernel", 0, LOG_KERN); ++ /* ++ * glibc problem: for some reason, glibc changes LOG_KERN to LOG_USER ++ * above. The logic behind this is that standard ++ * http://pubs.opengroup.org/onlinepubs/9699919799/functions/syslog.html ++ * says the following about openlog and syslog: ++ * "LOG_USER ++ * Messages generated by arbitrary processes. ++ * This is the default facility identifier if none is specified." ++ * ++ * I believe glibc misinterpreted this text as "if openlog's ++ * third parameter is 0 (=LOG_KERN), treat it as LOG_USER". ++ * Whereas it was meant to say "if *syslog* is called with facility ++ * 0 in its 1st parameter without prior call to openlog, then perform ++ * implicit openlog(LOG_USER)". ++ * ++ * As a result of this, eh, feature, standard klogd was forced ++ * to open-code its own openlog and syslog implementation (!). ++ * ++ * Note that prohibiting openlog(LOG_KERN) on libc level does not ++ * add any security: any process can open a socket to "/dev/log" ++ * and write a string "<0>Voila, a LOG_KERN + LOG_EMERG message" ++ * ++ * Google code search tells me there is no widespread use of ++ * openlog("foo", 0, 0), thus fixing glibc won't break userspace. ++ * ++ * The bug against glibc was filed: ++ * bugzilla.redhat.com/show_bug.cgi?id=547000 ++ */ + + if (i) + klogd_setloglevel(i); + +- bb_signals(BB_FATAL_SIGS, record_signo); + signal(SIGHUP, SIG_IGN); ++ /* We want klogd_read to not be restarted, thus _norestart: */ ++ bb_signals_recursive_norestart(BB_FATAL_SIGS, record_signo); + + syslog(LOG_NOTICE, "klogd started: %s", bb_banner); + |