1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
// Copyright 2021 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.
// TODO: switch syz-verifier to use syz-fuzzer.
//go:build ignore
package main
import (
"errors"
"net"
"os"
"sync"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/rpctype"
)
// RPCServer is a wrapper around the rpc.Server. It communicates with Runners,
// generates programs and sends complete Results for verification.
type RPCServer struct {
vrf *Verifier
port int
// protects next variables
mu sync.Mutex
// used to count the pools w/o UnsupportedCalls result
notChecked int
// vmTasks store the per-VM currently assigned tasks Ids
vmTasksInProgress map[int]map[int64]bool
}
func startRPCServer(vrf *Verifier) (*RPCServer, error) {
srv := &RPCServer{
vrf: vrf,
notChecked: len(vrf.pools),
}
s, err := rpctype.NewRPCServer(vrf.addr, "Verifier", srv)
if err != nil {
return nil, err
}
log.Logf(0, "serving rpc on tcp://%v", s.Addr())
srv.port = s.Addr().(*net.TCPAddr).Port
go s.Serve()
return srv, nil
}
// Connect notifies the RPCServer that a new Runner was started.
func (srv *RPCServer) Connect(a *rpctype.RunnerConnectArgs, r *rpctype.RunnerConnectRes) error {
r.CheckUnsupportedCalls = !srv.vrf.pools[a.Pool].checked
return nil
}
// UpdateUnsupported communicates to the server the list of system calls not
// supported by the kernel corresponding to this pool and updates the list of
// enabled system calls. This function is called once for each kernel.
// When all kernels have reported the list of unsupported system calls, the
// choice table will be created using only the system calls supported by all
// kernels.
func (srv *RPCServer) UpdateUnsupported(a *rpctype.UpdateUnsupportedArgs, r *int) error {
srv.mu.Lock()
defer srv.mu.Unlock()
if srv.vrf.pools[a.Pool].checked {
return nil
}
srv.vrf.pools[a.Pool].checked = true
vrf := srv.vrf
for _, unsupported := range a.UnsupportedCalls {
if c := vrf.target.Syscalls[unsupported.ID]; vrf.calls[c] {
vrf.reasons[c] = unsupported.Reason
}
}
srv.notChecked--
if srv.notChecked == 0 {
vrf.finalizeCallSet(os.Stdout)
vrf.stats.SetSyscallMask(vrf.calls)
vrf.SetPrintStatAtSIGINT()
vrf.choiceTable = vrf.target.BuildChoiceTable(nil, vrf.calls)
vrf.progGeneratorInit.Done()
}
return nil
}
// NextExchange is called when a Runner requests a new program to execute and,
// potentially, wants to send a new Result to the RPCServer.
func (srv *RPCServer) NextExchange(a *rpctype.NextExchangeArgs, r *rpctype.NextExchangeRes) error {
if a.Info.Calls != nil {
srv.stopWaitResult(a.Pool, a.VM, a.ExecTaskID)
srv.vrf.PutExecResult(&ExecResult{
Pool: a.Pool,
Hanged: a.Hanged,
Info: a.Info,
ExecTaskID: a.ExecTaskID,
})
}
// TODO: NewEnvironment is the currently hardcoded logic. Relax it.
task := srv.vrf.GetRunnerTask(a.Pool, NewEnvironment)
srv.startWaitResult(a.Pool, a.VM, task.ID)
r.ExecTask = *task
return nil
}
func vmTasksKey(poolID, vmID int) int {
return poolID*1000 + vmID
}
func (srv *RPCServer) startWaitResult(poolID, vmID int, taskID int64) {
srv.mu.Lock()
defer srv.mu.Unlock()
if srv.vmTasksInProgress == nil {
srv.vmTasksInProgress = make(map[int]map[int64]bool)
}
if srv.vmTasksInProgress[vmTasksKey(poolID, vmID)] == nil {
srv.vmTasksInProgress[vmTasksKey(poolID, vmID)] =
make(map[int64]bool)
}
srv.vmTasksInProgress[vmTasksKey(poolID, vmID)][taskID] = true
}
func (srv *RPCServer) stopWaitResult(poolID, vmID int, taskID int64) {
srv.mu.Lock()
defer srv.mu.Unlock()
delete(srv.vmTasksInProgress[vmTasksKey(poolID, vmID)], taskID)
}
// cleanup is called when a vm.Instance crashes.
func (srv *RPCServer) cleanup(poolID, vmID int) {
srv.mu.Lock()
defer srv.mu.Unlock()
// Signal error for every VM related task and let upper level logic to process it.
for taskID := range srv.vmTasksInProgress[vmTasksKey(poolID, vmID)] {
srv.vrf.PutExecResult(&ExecResult{
Pool: poolID,
ExecTaskID: taskID,
Crashed: true,
Error: errors.New("VM crashed during the task execution"),
})
}
delete(srv.vmTasksInProgress, vmTasksKey(poolID, vmID))
}
|
