all: basic building on netbsd

This just makes make TARGETOS=netbsd succeed.
We don't yet have prog target for netbsd.

executor/executor_bsd.cc

@@ -0,0 +1,174 @@
+// Copyright 2017 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+// +build
+
+#define SYZ_EXECUTOR
+#include "common_freebsd.h"
+
+#include "executor_posix.h"
+
+#include "executor.h"
+
+#include "syscalls_freebsd.h"
+
+#include <signal.h>
+#include <sys/mman.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+const int kInFd = 3;
+const int kOutFd = 4;
+
+uint32_t* output_data;
+uint32_t* output_pos;
+
+int main(int argc, char** argv)
+{
+	if (argc == 2 && strcmp(argv[1], "version") == 0) {
+		puts(GOOS " " GOARCH " " SYZ_REVISION " " GIT_REVISION);
+		return 0;
+	}
+
+	if (mmap(&input_data[0], kMaxInput, PROT_READ, MAP_PRIVATE | MAP_FIXED, kInFd, 0) != &input_data[0])
+		fail("mmap of input file failed");
+	// The output region is the only thing in executor process for which consistency matters.
+	// If it is corrupted ipc package will fail to parse its contents and panic.
+	// But fuzzer constantly invents new ways of how to currupt the region,
+	// so we map the region at a (hopefully) hard to guess address surrounded by unmapped pages.
+	void* const kOutputDataAddr = (void*)0x1ddbc20000;
+	output_data = (uint32_t*)mmap(kOutputDataAddr, kMaxOutput, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, kOutFd, 0);
+	if (output_data != kOutputDataAddr)
+		fail("mmap of output file failed");
+	// Prevent random programs to mess with these fds.
+	// Due to races in collider mode, a program can e.g. ftruncate one of these fds,
+	// which will cause fuzzer to crash.
+	// That's also the reason why we close kInPipeFd/kOutPipeFd below.
+	close(kInFd);
+	close(kOutFd);
+
+	// Some minimal sandboxing.
+	struct rlimit rlim;
+	rlim.rlim_cur = rlim.rlim_max = 128 << 20;
+	setrlimit(RLIMIT_AS, &rlim);
+	rlim.rlim_cur = rlim.rlim_max = 8 << 20;
+	setrlimit(RLIMIT_MEMLOCK, &rlim);
+	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
+	setrlimit(RLIMIT_FSIZE, &rlim);
+	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
+	setrlimit(RLIMIT_STACK, &rlim);
+	rlim.rlim_cur = rlim.rlim_max = 0;
+	setrlimit(RLIMIT_CORE, &rlim);
+
+	install_segv_handler();
+	setup_control_pipes();
+	receive_handshake();
+	reply_handshake();
+	cover_open();
+
+	for (;;) {
+		receive_execute(false);
+		char cwdbuf[128] = "/syz-tmpXXXXXX";
+		if (mkdtemp(cwdbuf))
+			fail("mkdtemp failed");
+		int pid = fork();
+		if (pid < 0)
+			fail("fork failed");
+		if (pid == 0) {
+			close(kInPipeFd);
+			close(kOutPipeFd);
+			if (chdir(cwdbuf))
+				fail("chdir failed");
+			output_pos = output_data;
+			execute_one();
+			doexit(0);
+		}
+		int status = 0;
+		uint64_t start = current_time_ms();
+		uint64_t last_executed = start;
+		uint32_t executed_calls = __atomic_load_n(output_data, __ATOMIC_RELAXED);
+		for (;;) {
+			int res = waitpid(pid, &status, WNOHANG);
+			if (res == pid)
+				break;
+			sleep_ms(1);
+			uint64_t now = current_time_ms();
+			uint32_t now_executed = __atomic_load_n(output_data, __ATOMIC_RELAXED);
+			if (executed_calls != now_executed) {
+				executed_calls = now_executed;
+				last_executed = now;
+			}
+			if ((now - start < 3 * 1000) && (now - last_executed < 500))
+				continue;
+			kill(pid, SIGKILL);
+			while (waitpid(pid, &status, 0) != pid) {
+			}
+			break;
+		}
+		status = WEXITSTATUS(status);
+		if (status == kFailStatus)
+			fail("child failed");
+		if (status == kErrorStatus)
+			error("child errored");
+		remove_dir(cwdbuf);
+		reply_execute(0);
+	}
+	return 0;
+}
+
+long execute_syscall(call_t* c, long a0, long a1, long a2, long a3, long a4, long a5, long a6, long a7, long a8)
+{
+	if (c->call)
+		return c->call(a0, a1, a2, a3, a4, a5, a6, a7, a8);
+	return syscall(c->sys_nr, a0, a1, a2, a3, a4, a5);
+}
+
+void cover_open()
+{
+	if (!flag_cover)
+		return;
+	for (int i = 0; i < kMaxThreads; i++) {
+		thread_t* th = &threads[i];
+		th->cover_data = &th->cover_buffer[0];
+	}
+}
+
+void cover_enable(thread_t* th)
+{
+}
+
+void cover_reset(thread_t* th)
+{
+}
+
+uint64_t read_cover_size(thread_t* th)
+{
+	if (!flag_cover)
+		return 0;
+	// Fallback coverage since we have no real coverage available.
+	// We use syscall number or-ed with returned errno value as signal.
+	// At least this gives us all combinations of syscall+errno.
+	th->cover_data[0] = (th->call_num << 16) | ((th->res == -1 ? th->reserrno : 0) & 0x3ff);
+	return 1;
+}
+
+uint32_t* write_output(uint32_t v)
+{
+	if (collide)
+		return 0;
+	if (output_pos < output_data || (char*)output_pos >= (char*)output_data + kMaxOutput)
+		fail("output overflow");
+	*output_pos = v;
+	return output_pos++;
+}
+
+void write_completed(uint32_t completed)
+{
+	__atomic_store_n(output_data, completed, __ATOMIC_RELEASE);
+}
+
+bool kcov_comparison_t::ignore() const
+{
+	return false;
+}

executor/executor_freebsd.cc

@@ -0,0 +1 @@
+executor_bsd.cc

executor/executor_netbsd.cc

@@ -0,0 +1 @@
+executor_bsd.cc

pkg/host/host_netbsd.go

@@ -0,0 +1,21 @@
+// Copyright 2017 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package host
+
+import (
+	"github.com/google/syzkaller/prog"
+)
+
+// DetectSupportedSyscalls returns list on supported syscalls on host.
+func DetectSupportedSyscalls(target *prog.Target) (map[*prog.Syscall]bool, error) {
+	supported := make(map[*prog.Syscall]bool)
+	for _, c := range target.Syscalls {
+		supported[c] = true
+	}
+	return supported, nil
+}
+
+func EnableFaultInjection() error {
+	return nil
+}

pkg/osutil/osutil_freebsd.go → pkg/osutil/osutil_bsd.go

@@ -1,6 +1,8 @@
 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
+// +build freebsd netbsd
+
 package osutil
 
 import (

pkg/osutil/osutil_unix.go

@@ -1,7 +1,7 @@
 // Copyright 2017 syzkaller project authors. All rights reserved.
 // Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
 
-// +build freebsd,!appengine linux,!appengine darwin,!appengine
+// +build freebsd,!appengine netbsd,!appengine linux,!appengine darwin,!appengine
 
 package osutil