mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Etienne Perot
44e2d0fcfe
This will be used to plumb the syscall number through to a counter metric that exports the number of times an unimplemented syscall has been called. Plenty of syscall implementations call `EmitUnimplementedEvent` for flags and settings that are not implemented. With `sysno` available, they will be able to plumb that bit of information through. PiperOrigin-RevId: 518635831
49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
// Copyright 2019 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 linux
|
|
|
|
import (
|
|
"gvisor.dev/gvisor/pkg/abi/linux"
|
|
"gvisor.dev/gvisor/pkg/errors/linuxerr"
|
|
"gvisor.dev/gvisor/pkg/sentry/arch"
|
|
"gvisor.dev/gvisor/pkg/sentry/kernel"
|
|
)
|
|
|
|
// RSeq implements syscall rseq(2).
|
|
func RSeq(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
|
|
addr := args[0].Pointer()
|
|
length := args[1].Uint()
|
|
flags := args[2].Int()
|
|
signature := args[3].Uint()
|
|
|
|
if !t.RSeqAvailable() {
|
|
// Event for applications that want rseq on a configuration
|
|
// that doesn't support them.
|
|
t.Kernel().EmitUnimplementedEvent(t, sysno)
|
|
return 0, nil, linuxerr.ENOSYS
|
|
}
|
|
|
|
switch flags {
|
|
case 0:
|
|
// Register.
|
|
return 0, nil, t.SetRSeq(addr, length, signature)
|
|
case linux.RSEQ_FLAG_UNREGISTER:
|
|
return 0, nil, t.ClearRSeq(addr, length, signature)
|
|
default:
|
|
// Unknown flag.
|
|
return 0, nil, linuxerr.EINVAL
|
|
}
|
|
}
|