[git commit 0_9_30] make sure to block all signals when calling daemon() to prevent delivery while the parent is sharing the stack

[Mike Frysinger]

commit: http://git.uclibc.org/uClibc/commit/?id=d755276ed25623feeb593dc3c0f34c3e52983efd
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/0_9_30

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
---
 libc/unistd/daemon.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/libc/unistd/daemon.c b/libc/unistd/daemon.c
index ed6c381..ac9143a 100644
--- a/libc/unistd/daemon.c
+++ b/libc/unistd/daemon.c
@@ -44,6 +44,7 @@
 #include <features.h>
 #include <fcntl.h>
 #include <paths.h>
+#include <signal.h>
 #include <unistd.h>
 
 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
@@ -61,7 +62,7 @@ libc_hidden_proto(fork)
 /* use clone() to get fork() like behavior here -- we just want to disassociate
  * from the controlling terminal
  */
-static inline pid_t fork_parent(void)
+static inline pid_t _fork_parent(void)
 {
 	register unsigned long ret = INTERNAL_SYSCALL(clone, wtf, 2, CLONE_VM, 0);
 	if (ret != -1 && ret != 0)
@@ -69,6 +70,17 @@ static inline pid_t fork_parent(void)
 		INTERNAL_SYSCALL(exit, wtf, 0);
 	return ret;
 }
+static inline pid_t fork_parent(void)
+{
+	/* Block all signals to keep the parent from using the stack */
+	pid_t ret;
+	sigset_t new_set, old_set;
+	sigfillset(&new_set);
+	sigprocmask(SIG_BLOCK, &new_set, &old_set);
+	ret = _fork_parent();
+	sigprocmask(SIG_SETMASK, &old_set, NULL);
+	return ret;
+}
 #else
 static inline pid_t fork_parent(void)
 {
-- 
1.6.3.3