autofs-5.0.4 - allow the automount daemon to dump core

From: Jeff Moyer <jmoyer@redhat.com>

Right now, the automount daemon blocks all signals.  We should at least
unblock those that will cause us to dump core.  Otherwise, I think the
behaviour could be, umm, interesting.

I tested this by sending SIGBUS and SIGSEGV to the automount daemon.

edit - raven
- I changed this a little so that the change to the signals is
  done in one place and added SIGABRT and SIGTRAP to the list
  of signals that aren't blocked.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
---

 CHANGELOG          |    1 +
 daemon/automount.c |   16 ++++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)


diff --git a/CHANGELOG b/CHANGELOG
index 7f27f5e..4b85649 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -57,6 +57,7 @@
 - mannual umount recovery fixes.
 - fix map type info parse error.
 - fix an RPC fd leak.
+- don't block signals we expect to dump core.
 
 4/11/2008 autofs-5.0.4
 -----------------------
diff --git a/daemon/automount.c b/daemon/automount.c
index 44dcdd6..e7f801b 100644
--- a/daemon/automount.c
+++ b/daemon/automount.c
@@ -64,6 +64,8 @@ static int st_stat = 1;
 static int *pst_stat = &st_stat;
 static pthread_t state_mach_thid;
 
+static sigset_t block_sigs;
+
 /* Pre-calculated kernel packet length */
 static size_t kpkt_len;
 
@@ -1321,7 +1323,7 @@ static void *statemachine(void *arg)
 	sigset_t signalset;
 	int sig;
 
-	sigfillset(&signalset);
+	memcpy(&signalset, &block_sigs, sizeof(signalset));
 	sigdelset(&signalset, SIGCHLD);
 	sigdelset(&signalset, SIGCONT);
 
@@ -1817,7 +1819,6 @@ int main(int argc, char *argv[])
 	unsigned foreground, have_global_options;
 	time_t timeout;
 	time_t age = time(NULL);
-	sigset_t allsigs;
 	struct rlimit rlim;
 	static const struct option long_options[] = {
 		{"help", 0, 0, 'h'},
@@ -1837,8 +1838,15 @@ int main(int argc, char *argv[])
 		{0, 0, 0, 0}
 	};
 
-	sigfillset(&allsigs);
-	sigprocmask(SIG_BLOCK, &allsigs, NULL);
+	sigfillset(&block_sigs);
+	/* allow for the dropping of core files */
+	sigdelset(&block_sigs, SIGABRT);
+	sigdelset(&block_sigs, SIGBUS);
+	sigdelset(&block_sigs, SIGSEGV);
+	sigdelset(&block_sigs, SIGILL);
+	sigdelset(&block_sigs, SIGFPE);
+	sigdelset(&block_sigs, SIGTRAP);
+	sigprocmask(SIG_BLOCK, &block_sigs, NULL);
 
 	program = argv[0];