72 lines
2.3 KiB
Go
72 lines
2.3 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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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/kernel"
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"gvisor.dev/gvisor/pkg/syserror"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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// CopyInSigSet copies in a sigset_t, checks its size, and ensures that KILL and
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// STOP are clear.
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//
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// TODO(gvisor.dev/issue/1624): This is only exported because
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// syscalls/vfs2/signal.go depends on it. Once vfs1 is deleted and the vfs2
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// syscalls are moved into this package, then they can be unexported.
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func CopyInSigSet(t *kernel.Task, sigSetAddr usermem.Addr, size uint) (linux.SignalSet, error) {
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if size != linux.SignalSetSize {
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return 0, syserror.EINVAL
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}
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b := t.CopyScratchBuffer(8)
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if _, err := t.CopyInBytes(sigSetAddr, b); err != nil {
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return 0, err
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}
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mask := usermem.ByteOrder.Uint64(b[:])
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return linux.SignalSet(mask) &^ kernel.UnblockableSignals, nil
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}
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// copyOutSigSet copies out a sigset_t.
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func copyOutSigSet(t *kernel.Task, sigSetAddr usermem.Addr, mask linux.SignalSet) error {
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b := t.CopyScratchBuffer(8)
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usermem.ByteOrder.PutUint64(b, uint64(mask))
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_, err := t.CopyOutBytes(sigSetAddr, b)
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return err
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}
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// copyInSigSetWithSize copies in a structure as below
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//
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// struct {
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// sigset_t* sigset_addr;
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// size_t sizeof_sigset;
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// };
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//
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// and returns sigset_addr and size.
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func copyInSigSetWithSize(t *kernel.Task, addr usermem.Addr) (usermem.Addr, uint, error) {
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switch t.Arch().Width() {
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case 8:
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in := t.CopyScratchBuffer(16)
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if _, err := t.CopyInBytes(addr, in); err != nil {
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return 0, 0, err
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}
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maskAddr := usermem.Addr(usermem.ByteOrder.Uint64(in[0:]))
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maskSize := uint(usermem.ByteOrder.Uint64(in[8:]))
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return maskAddr, maskSize, nil
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default:
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return 0, 0, syserror.ENOSYS
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}
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}
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