github.com/metacubex/gvisor@v0.0.0-20240320004321-933faba989ec/pkg/sentry/fsutil/host_file_mapper_unsafe.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package fsutil
    16  
    17  import (
    18  	"unsafe"
    19  
    20  	"github.com/metacubex/gvisor/pkg/safemem"
    21  )
    22  
    23  func (*HostFileMapper) unsafeBlockFromChunkMapping(addr uintptr) safemem.Block {
    24  	// We don't control the host file's length, so touching its mappings may
    25  	// raise SIGBUS. Thus accesses to it must use safecopy.
    26  	return safemem.BlockFromUnsafePointer((unsafe.Pointer)(addr), chunkSize)
    27  }