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https://github.com/hanzoai/visor.git
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Etienne PerotandgVisor bot
da6948a692
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
57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build amd64
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// +build amd64
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package linux
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import (
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/errors/linuxerr"
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"gvisor.dev/gvisor/pkg/marshal/primitive"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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)
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// ArchPrctl implements linux syscall arch_prctl(2).
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// It sets architecture-specific process or thread state for t.
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func ArchPrctl(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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switch args[0].Int() {
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case linux.ARCH_GET_FS:
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addr := args[1].Pointer()
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fsbase := t.Arch().TLS()
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switch t.Arch().Width() {
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case 8:
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if _, err := primitive.CopyUint64Out(t, addr, uint64(fsbase)); err != nil {
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return 0, nil, err
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}
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default:
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return 0, nil, linuxerr.ENOSYS
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}
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case linux.ARCH_SET_FS:
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fsbase := args[1].Uint64()
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if !t.Arch().SetTLS(uintptr(fsbase)) {
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return 0, nil, linuxerr.EPERM
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}
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case linux.ARCH_GET_GS, linux.ARCH_SET_GS:
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t.Kernel().EmitUnimplementedEvent(t, sysno)
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fallthrough
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default:
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return 0, nil, linuxerr.EINVAL
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}
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return 0, nil, nil
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}
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