From: William Lallemand <wlallemand@haproxy.com>
Date: Thu, 7 Jun 2018 07:49:04 +0000 (+0200)
Subject: BUG/MINOR: don't ignore SIG{BUS,FPE,ILL,SEGV} during signal processing
X-Git-Tag: v1.9-dev1~207
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=933642c6ef7c3015222cba84c20f13a1ca0eafd6;p=thirdparty%2Fhaproxy.git

BUG/MINOR: don't ignore SIG{BUS,FPE,ILL,SEGV} during signal processing

We don't have any reason of blocking those signals.

If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while they are blocked, the
result is undefined, unless the signal was generated by kill(2), sigqueue(3), or
raise(3).

This should be backported to 1.8.
---

diff --git a/src/signal.c b/src/signal.c
index f1f6821883..0dadd762c1 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -120,6 +120,14 @@ int signal_init()
 
 	sigfillset(&blocked_sig);
 	sigdelset(&blocked_sig, SIGPROF);
+	/* man sigprocmask: If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are
+	   generated while they are blocked, the result is undefined, unless
+	   the signal was generated by kill(2),
+	   sigqueue(3), or raise(3) */
+	sigdelset(&blocked_sig, SIGBUS);
+	sigdelset(&blocked_sig, SIGFPE);
+	sigdelset(&blocked_sig, SIGILL);
+	sigdelset(&blocked_sig, SIGSEGV);
 	for (sig = 0; sig < MAX_SIGNAL; sig++)
 		LIST_INIT(&signal_state[sig].handlers);