76 lines
2.9 KiB
Go
76 lines
2.9 KiB
Go
// Copyright 2020 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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//+build amd64
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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/binary"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/usermem"
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)
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// copyOutStat copies the attributes (sattr, uattr) to the struct stat at
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// address dst in t's address space. It encodes the stat struct to bytes
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// manually, as stat() is a very common syscall for many applications, and
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// t.CopyObjectOut has noticeable performance impact due to its many slice
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// allocations and use of reflection.
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func copyOutStat(t *kernel.Task, dst usermem.Addr, sattr fs.StableAttr, uattr fs.UnstableAttr) error {
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b := t.CopyScratchBuffer(int(linux.SizeOfStat))[:0]
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// Dev (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(sattr.DeviceID))
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// Ino (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(sattr.InodeID))
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// Nlink (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uattr.Links)
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// Mode (uint32)
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b = binary.AppendUint32(b, usermem.ByteOrder, sattr.Type.LinuxType()|uint32(uattr.Perms.LinuxMode()))
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// UID (uint32)
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b = binary.AppendUint32(b, usermem.ByteOrder, uint32(uattr.Owner.UID.In(t.UserNamespace()).OrOverflow()))
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// GID (uint32)
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b = binary.AppendUint32(b, usermem.ByteOrder, uint32(uattr.Owner.GID.In(t.UserNamespace()).OrOverflow()))
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// Padding (uint32)
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b = binary.AppendUint32(b, usermem.ByteOrder, 0)
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// Rdev (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(linux.MakeDeviceID(sattr.DeviceFileMajor, sattr.DeviceFileMinor)))
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// Size (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(uattr.Size))
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// Blksize (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(sattr.BlockSize))
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// Blocks (uint64)
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(uattr.Usage/512))
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// ATime
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atime := uattr.AccessTime.Timespec()
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(atime.Sec))
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(atime.Nsec))
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// MTime
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mtime := uattr.ModificationTime.Timespec()
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(mtime.Sec))
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(mtime.Nsec))
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// CTime
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ctime := uattr.StatusChangeTime.Timespec()
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(ctime.Sec))
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b = binary.AppendUint64(b, usermem.ByteOrder, uint64(ctime.Nsec))
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_, err := t.CopyOutBytes(dst, b)
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return err
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}
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