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// Copyright 2018 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/hostarch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
)
// CopyInSigSet copies in a sigset_t, checks its size, and ensures that KILL and
// STOP are clear.
//
// TODO(gvisor.dev/issue/1624): This is only exported because
// syscalls/vfs2/signal.go depends on it. Once vfs1 is deleted and the vfs2
// syscalls are moved into this package, then they can be unexported.
func CopyInSigSet(t *kernel.Task, sigSetAddr hostarch.Addr, size uint) (linux.SignalSet, error) {
if size != linux.SignalSetSize {
return 0, linuxerr.EINVAL
}
b := t.CopyScratchBuffer(8)
if _, err := t.CopyInBytes(sigSetAddr, b); err != nil {
return 0, err
}
mask := hostarch.ByteOrder.Uint64(b[:])
return linux.SignalSet(mask) &^ kernel.UnblockableSignals, nil
}
// copyOutSigSet copies out a sigset_t.
func copyOutSigSet(t *kernel.Task, sigSetAddr hostarch.Addr, mask linux.SignalSet) error {
b := t.CopyScratchBuffer(8)
hostarch.ByteOrder.PutUint64(b, uint64(mask))
_, err := t.CopyOutBytes(sigSetAddr, b)
return err
}
// copyInSigSetWithSize copies in a structure as below
//
// struct {
// sigset_t* sigset_addr;
// size_t sizeof_sigset;
// };
//
// and returns sigset_addr and size.
func copyInSigSetWithSize(t *kernel.Task, addr hostarch.Addr) (hostarch.Addr, uint, error) {
switch t.Arch().Width() {
case 8:
in := t.CopyScratchBuffer(16)
if _, err := t.CopyInBytes(addr, in); err != nil {
return 0, 0, err
}
maskAddr := hostarch.Addr(hostarch.ByteOrder.Uint64(in[0:]))
maskSize := uint(hostarch.ByteOrder.Uint64(in[8:]))
return maskAddr, maskSize, nil
default:
return 0, 0, linuxerr.ENOSYS
}
}
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