Split the intra-thread functionality from kill(2) into its own syscall

thrkill(2), rolling the kill(2) syscall number with the ABI change to
avoid breaking binaries during during the transition.  thrkill(2) includes
a 'tcb' argument that eliminates the need for locking in pthread_kill()
and simplifies pthread_cancel().  Switch __stack_smash_handler() to use
thrkill(2) and explicitly unblock SIGABRT.

Minor bump to both libc and libpthread: make sure you install a new kernel!

ok semarie@

1 files changed, 4 insertions, 5 deletions

diff --git a/lib/libc/sys/stack_protector.c b/lib/libc/sys/stack_protector.c
index 75c7ef83d79..e61a5f2f82f 100644
--- a/lib/libc/sys/stack_protector.c
+++ b/lib/libc/sys/stack_protector.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: stack_protector.c,v 1.18 2015/11/10 04:14:03 guenther Exp $	*/
+/*	$OpenBSD: stack_protector.c,v 1.19 2015/11/10 04:30:59 guenther Exp $	*/
 
 /*
  * Copyright (c) 2002 Hiroaki Etoh, Federico G. Schwindt, and Miodrag Vallat.
@@ -57,18 +57,17 @@ __stack_smash_handler(const char func[], int damaged)
 	/* Immediately block all signal handlers from running code */
 	sigfillset(&mask);
 	sigdelset(&mask, SIGABRT);
-	sigprocmask(SIG_BLOCK, &mask, NULL);
+	sigprocmask(SIG_SETMASK, &mask, NULL);
 
-	/* This may fail on a chroot jail... */
 	syslog_r(LOG_CRIT, &sdata, message, func);
 
-	bzero(&sa, sizeof(struct sigaction));
+	memset(&sa, 0, sizeof(sa));
 	sigemptyset(&sa.sa_mask);
 	sa.sa_flags = 0;
 	sa.sa_handler = SIG_DFL;
 	sigaction(SIGABRT, &sa, NULL);
 
-	kill(getpid(), SIGABRT);
+	thrkill(0, SIGABRT, NULL);
 
 	_exit(127);
 }