Add mandatory OpenBSD bits (#689)

all: add openbsd support

squash of the following commits:

* openbsd: add mandatory bits
* report: add OpenBSD support
* executor: skip building kvm on OpenBSD
* executor: add OpenBSD support
Linking against libutil is necessary due to usage of openpty(3).
* executor: fix typo in fail() message
* fixup! report: add OpenBSD support
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! report: add OpenBSD support
* gometalinter: skip sys/openbsd

1 files changed, 31 insertions, 0 deletions

diff --git a/executor/common_bsd.h b/executor/common_bsd.h
index b678dd968..004009861 100644
--- a/executor/common_bsd.h
+++ b/executor/common_bsd.h
@@ -18,3 +18,34 @@ static int do_sandbox_none(void)
 #define do_sandbox_setuid() 0
 #define do_sandbox_namespace() 0
 #endif
+
+#if GOOS_openbsd
+
+#define __syscall syscall
+
+#if SYZ_EXECUTOR || __NR_syz_open_pts
+
+#if defined(__OpenBSD__)
+#include <termios.h>
+#include <util.h>
+#else
+// Needed when compiling on Linux.
+#include <pty.h>
+#endif
+
+static uintptr_t syz_open_pts(void)
+{
+	int master, slave;
+
+	if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
+		return -1;
+	// Move the master fd up in order to reduce the chances of the fuzzer
+	// generating a call to close(2) with the same fd.
+	if (dup2(master, master + 100) != -1)
+		close(master);
+	return slave;
+}
+
+#endif
+
+#endif