pkg/host: move from host

2 files changed, 0 insertions, 238 deletions

diff --git a/host/host.go b/host/host.go
deleted file mode 100644
index 4e634f1aa..000000000
--- a/host/host.go
+++ /dev/null
@@ -1,164 +0,0 @@
-// Copyright 2015 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 (
-	"bytes"
-	"io/ioutil"
-	"runtime"
-	"strconv"
-	"strings"
-	"syscall"
-
-	"github.com/google/syzkaller/pkg/osutil"
-	"github.com/google/syzkaller/sys"
-)
-
-// DetectSupportedSyscalls returns list on supported syscalls on host.
-func DetectSupportedSyscalls() (map[*sys.Call]bool, error) {
-	// There are 3 possible strategies:
-	// 1. Executes all syscalls with presumably invalid arguments and check for ENOSYS.
-	//    But not all syscalls are safe to execute. For example, pause will hang,
-	//    while setpgrp will push the process into own process group.
-	// 2. Check presence of /sys/kernel/debug/tracing/events/syscalls/sys_enter_* files.
-	//    This requires root and CONFIG_FTRACE_SYSCALLS. Also it lies for some syscalls.
-	//    For example, on x86_64 it says that sendfile is not present (only sendfile64).
-	// 3. Check sys_syscallname in /proc/kallsyms.
-	//    Requires CONFIG_KALLSYMS. Seems to be the most reliable. That's what we use here.
-
-	kallsyms, _ := ioutil.ReadFile("/proc/kallsyms")
-	supported := make(map[*sys.Call]bool)
-	for _, c := range sys.Calls {
-		if isSupported(kallsyms, c) {
-			supported[c] = true
-		}
-	}
-	return supported, nil
-}
-
-func isSupported(kallsyms []byte, c *sys.Call) bool {
-	if c.NR == -1 {
-		return false // don't even have a syscall number
-	}
-	if strings.HasPrefix(c.CallName, "syz_") {
-		return isSupportedSyzkall(c)
-	}
-	if strings.HasPrefix(c.Name, "socket$") {
-		return isSupportedSocket(c)
-	}
-	if strings.HasPrefix(c.Name, "open$") {
-		return isSupportedOpen(c)
-	}
-	if strings.HasPrefix(c.Name, "openat$") {
-		return isSupportedOpenAt(c)
-	}
-	if len(kallsyms) == 0 {
-		return true
-	}
-	return bytes.Index(kallsyms, []byte(" T sys_"+c.CallName+"\n")) != -1
-}
-
-func isSupportedSyzkall(c *sys.Call) bool {
-	switch c.CallName {
-	case "syz_test":
-		return false
-	case "syz_open_dev":
-		if _, ok := c.Args[0].(*sys.ConstType); ok {
-			// This is for syz_open_dev$char/block.
-			// They are currently commented out, but in case one enables them.
-			return true
-		}
-		fname, ok := extractStringConst(c.Args[0])
-		if !ok {
-			panic("first open arg is not a pointer to string const")
-		}
-		if syscall.Getuid() != 0 {
-			return false
-		}
-		var check func(dev string) bool
-		check = func(dev string) bool {
-			if !strings.Contains(dev, "#") {
-				return osutil.IsExist(dev)
-			}
-			for i := 0; i < 10; i++ {
-				if check(strings.Replace(dev, "#", strconv.Itoa(i), 1)) {
-					return true
-				}
-			}
-			return false
-		}
-		return check(fname)
-	case "syz_open_pts":
-		return true
-	case "syz_fuse_mount":
-		return osutil.IsExist("/dev/fuse")
-	case "syz_fuseblk_mount":
-		return osutil.IsExist("/dev/fuse") && syscall.Getuid() == 0
-	case "syz_emit_ethernet", "syz_extract_tcp_res":
-		fd, err := syscall.Open("/dev/net/tun", syscall.O_RDWR, 0)
-		if err == nil {
-			syscall.Close(fd)
-		}
-		return err == nil && syscall.Getuid() == 0
-	case "syz_kvm_setup_cpu":
-		switch c.Name {
-		case "syz_kvm_setup_cpu$x86":
-			return runtime.GOARCH == "amd64" || runtime.GOARCH == "386"
-		case "syz_kvm_setup_cpu$arm64":
-			return runtime.GOARCH == "arm64"
-		}
-	}
-	panic("unknown syzkall: " + c.Name)
-}
-
-func isSupportedSocket(c *sys.Call) bool {
-	af, ok := c.Args[0].(*sys.ConstType)
-	if !ok {
-		println(c.Name)
-		panic("socket family is not const")
-	}
-	fd, err := syscall.Socket(int(af.Val), 0, 0)
-	if fd != -1 {
-		syscall.Close(fd)
-	}
-	return err != syscall.ENOSYS && err != syscall.EAFNOSUPPORT
-}
-
-func isSupportedOpen(c *sys.Call) bool {
-	fname, ok := extractStringConst(c.Args[0])
-	if !ok {
-		return true
-	}
-	fd, err := syscall.Open(fname, syscall.O_RDONLY, 0)
-	if fd != -1 {
-		syscall.Close(fd)
-	}
-	return err == nil
-}
-
-func isSupportedOpenAt(c *sys.Call) bool {
-	fname, ok := extractStringConst(c.Args[1])
-	if !ok {
-		return true
-	}
-	fd, err := syscall.Open(fname, syscall.O_RDONLY, 0)
-	if fd != -1 {
-		syscall.Close(fd)
-	}
-	return err == nil
-}
-
-func extractStringConst(typ sys.Type) (string, bool) {
-	ptr, ok := typ.(*sys.PtrType)
-	if !ok {
-		panic("first open arg is not a pointer to string const")
-	}
-	str, ok := ptr.Type.(*sys.BufferType)
-	if !ok || str.Kind != sys.BufferString || len(str.Values) != 1 {
-		return "", false
-	}
-	v := str.Values[0]
-	v = v[:len(v)-1] // string terminating \x00
-	return v, true
-}
diff --git a/host/host_test.go b/host/host_test.go
deleted file mode 100644
index 9b44d8e36..000000000
--- a/host/host_test.go
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2015 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 (
-	"syscall"
-	"testing"
-
-	"github.com/google/syzkaller/sys"
-)
-
-func TestLog(t *testing.T) {
-	t.Parallel()
-	// Dump for manual inspection.
-	supp, err := DetectSupportedSyscalls()
-	if err != nil {
-		t.Skipf("skipping: %v", err)
-	}
-	t.Logf("unsupported:")
-	for _, c := range sys.Calls {
-		s, ok := supp[c]
-		if ok && !s {
-			t.Fatalf("map contains false value")
-		}
-		if !s {
-			t.Logf("\t%v", c.Name)
-		}
-	}
-	trans := sys.TransitivelyEnabledCalls(supp)
-	t.Logf("transitively unsupported:")
-	for _, c := range sys.Calls {
-		s, ok := trans[c]
-		if ok && !s {
-			t.Fatalf("map contains false value")
-		}
-		if !s && supp[c] {
-			t.Logf("\t%v", c.Name)
-		}
-	}
-}
-
-func TestSupportedSyscalls(t *testing.T) {
-	t.Parallel()
-	supp, err := DetectSupportedSyscalls()
-	if err != nil {
-		t.Skipf("skipping: %v", err)
-	}
-	// These are safe to execute with invalid arguments.
-	safe := []string{
-		"memfd_create",
-		"sendfile",
-		"bpf$MAP_CREATE",
-		"open",
-		"openat",
-		"read",
-		"write",
-		"stat",
-	}
-	for _, name := range safe {
-		c := sys.CallMap[name]
-		if c == nil {
-			t.Fatalf("can't find syscall '%v'", name)
-		}
-		a := ^uintptr(0) - 4097 // hopefully invalid
-		_, _, err := syscall.Syscall6(uintptr(c.NR), a, a, a, a, a, a)
-		if err == 0 {
-			t.Fatalf("%v did not fail", name)
-		}
-		if ok := err != syscall.ENOSYS; ok != supp[c] {
-			t.Fatalf("syscall %v: perse=%v kallsyms=%v", name, ok, supp[c])
-		}
-	}
-}