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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package strace
import (
"fmt"
"strings"
"gvisor.dev/gvisor/pkg/abi"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/hostarch"
)
// signalNames contains the names of all named signals.
var signalNames = abi.ValueSet{
uint64(linux.SIGABRT): "SIGABRT",
uint64(linux.SIGALRM): "SIGALRM",
uint64(linux.SIGBUS): "SIGBUS",
uint64(linux.SIGCHLD): "SIGCHLD",
uint64(linux.SIGCONT): "SIGCONT",
uint64(linux.SIGFPE): "SIGFPE",
uint64(linux.SIGHUP): "SIGHUP",
uint64(linux.SIGILL): "SIGILL",
uint64(linux.SIGINT): "SIGINT",
uint64(linux.SIGIO): "SIGIO",
uint64(linux.SIGKILL): "SIGKILL",
uint64(linux.SIGPIPE): "SIGPIPE",
uint64(linux.SIGPROF): "SIGPROF",
uint64(linux.SIGPWR): "SIGPWR",
uint64(linux.SIGQUIT): "SIGQUIT",
uint64(linux.SIGSEGV): "SIGSEGV",
uint64(linux.SIGSTKFLT): "SIGSTKFLT",
uint64(linux.SIGSTOP): "SIGSTOP",
uint64(linux.SIGSYS): "SIGSYS",
uint64(linux.SIGTERM): "SIGTERM",
uint64(linux.SIGTRAP): "SIGTRAP",
uint64(linux.SIGTSTP): "SIGTSTP",
uint64(linux.SIGTTIN): "SIGTTIN",
uint64(linux.SIGTTOU): "SIGTTOU",
uint64(linux.SIGURG): "SIGURG",
uint64(linux.SIGUSR1): "SIGUSR1",
uint64(linux.SIGUSR2): "SIGUSR2",
uint64(linux.SIGVTALRM): "SIGVTALRM",
uint64(linux.SIGWINCH): "SIGWINCH",
uint64(linux.SIGXCPU): "SIGXCPU",
uint64(linux.SIGXFSZ): "SIGXFSZ",
}
var signalMaskActions = abi.ValueSet{
linux.SIG_BLOCK: "SIG_BLOCK",
linux.SIG_UNBLOCK: "SIG_UNBLOCK",
linux.SIG_SETMASK: "SIG_SETMASK",
}
var sigActionFlags = abi.FlagSet{
{
Flag: linux.SA_NOCLDSTOP,
Name: "SA_NOCLDSTOP",
},
{
Flag: linux.SA_NOCLDWAIT,
Name: "SA_NOCLDWAIT",
},
{
Flag: linux.SA_SIGINFO,
Name: "SA_SIGINFO",
},
{
Flag: linux.SA_RESTORER,
Name: "SA_RESTORER",
},
{
Flag: linux.SA_ONSTACK,
Name: "SA_ONSTACK",
},
{
Flag: linux.SA_RESTART,
Name: "SA_RESTART",
},
{
Flag: linux.SA_NODEFER,
Name: "SA_NODEFER",
},
{
Flag: linux.SA_RESETHAND,
Name: "SA_RESETHAND",
},
}
func sigSet(t *kernel.Task, addr hostarch.Addr) string {
if addr == 0 {
return "null"
}
var b [linux.SignalSetSize]byte
if _, err := t.CopyInBytes(addr, b[:]); err != nil {
return fmt.Sprintf("%#x (error copying sigset: %v)", addr, err)
}
set := linux.SignalSet(hostarch.ByteOrder.Uint64(b[:]))
return fmt.Sprintf("%#x %s", addr, formatSigSet(set))
}
func formatSigSet(set linux.SignalSet) string {
var signals []string
linux.ForEachSignal(set, func(sig linux.Signal) {
signals = append(signals, signalNames.ParseDecimal(uint64(sig)))
})
return fmt.Sprintf("[%v]", strings.Join(signals, " "))
}
func sigAction(t *kernel.Task, addr hostarch.Addr) string {
if addr == 0 {
return "null"
}
var sa linux.SigAction
if _, err := sa.CopyIn(t, addr); err != nil {
return fmt.Sprintf("%#x (error copying sigaction: %v)", addr, err)
}
var handler string
switch sa.Handler {
case linux.SIG_IGN:
handler = "SIG_IGN"
case linux.SIG_DFL:
handler = "SIG_DFL"
default:
handler = fmt.Sprintf("%#x", sa.Handler)
}
return fmt.Sprintf("%#x {Handler: %s, Flags: %s, Restorer: %#x, Mask: %s}", addr, handler, sigActionFlags.Parse(sa.Flags), sa.Restorer, formatSigSet(sa.Mask))
}
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