54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2018 Google Inc.
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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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//+build amd64
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package linux
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import (
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"syscall"
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"gvisor.googlesource.com/gvisor/pkg/abi/linux"
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"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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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, 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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_, err := t.CopyOut(addr, &t.Arch().StateData().Regs.Fs_base)
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if err != nil {
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return 0, nil, err
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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 _, ok := t.MemoryManager().CheckIORange(usermem.Addr(fsbase), 0); !ok {
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return 0, nil, syscall.EPERM
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}
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regs := &t.Arch().StateData().Regs
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regs.Fs = 0
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regs.Fs_base = fsbase
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default:
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return 0, nil, syscall.EINVAL
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}
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return 0, nil, nil
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}
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