49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
// Copyright 2019 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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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/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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// RSeq implements syscall rseq(2).
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func RSeq(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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addr := args[0].Pointer()
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length := args[1].Uint()
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flags := args[2].Int()
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signature := args[3].Uint()
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if !t.RSeqAvailable() {
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// Event for applications that want rseq on a configuration
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// that doesn't support them.
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t.Kernel().EmitUnimplementedEvent(t)
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return 0, nil, syserror.ENOSYS
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}
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switch flags {
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case 0:
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// Register.
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return 0, nil, t.SetRSeq(addr, length, signature)
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case linux.RSEQ_FLAG_UNREGISTER:
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return 0, nil, t.ClearRSeq(addr, length, signature)
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default:
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// Unknown flag.
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return 0, nil, syserror.EINVAL
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}
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}
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