summaryrefslogtreecommitdiffhomepage
path: root/pkg/sentry/fsimpl
diff options
context:
space:
mode:
Diffstat (limited to 'pkg/sentry/fsimpl')
-rw-r--r--pkg/sentry/fsimpl/gofer/time.go3
-rw-r--r--pkg/sentry/fsimpl/tmpfs/device_file.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/directory.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/filesystem.go20
-rw-r--r--pkg/sentry/fsimpl/tmpfs/named_pipe.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/regular_file.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/socket_file.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/symlink.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/tmpfs.go71
9 files changed, 90 insertions, 28 deletions
diff --git a/pkg/sentry/fsimpl/gofer/time.go b/pkg/sentry/fsimpl/gofer/time.go
index 2608e7e1d..1d5aa82dc 100644
--- a/pkg/sentry/fsimpl/gofer/time.go
+++ b/pkg/sentry/fsimpl/gofer/time.go
@@ -38,6 +38,9 @@ func statxTimestampFromDentry(ns int64) linux.StatxTimestamp {
// Preconditions: fs.interop != InteropModeShared.
func (d *dentry) touchAtime(mnt *vfs.Mount) {
+ if mnt.Flags.NoATime {
+ return
+ }
if err := mnt.CheckBeginWrite(); err != nil {
return
}
diff --git a/pkg/sentry/fsimpl/tmpfs/device_file.go b/pkg/sentry/fsimpl/tmpfs/device_file.go
index 83bf885ee..ac54d420d 100644
--- a/pkg/sentry/fsimpl/tmpfs/device_file.go
+++ b/pkg/sentry/fsimpl/tmpfs/device_file.go
@@ -29,7 +29,7 @@ type deviceFile struct {
minor uint32
}
-func (fs *filesystem) newDeviceFile(creds *auth.Credentials, mode linux.FileMode, kind vfs.DeviceKind, major, minor uint32) *inode {
+func (fs *filesystem) newDeviceFile(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode, kind vfs.DeviceKind, major, minor uint32) *inode {
file := &deviceFile{
kind: kind,
major: major,
@@ -43,7 +43,7 @@ func (fs *filesystem) newDeviceFile(creds *auth.Credentials, mode linux.FileMode
default:
panic(fmt.Sprintf("invalid DeviceKind: %v", kind))
}
- file.inode.init(file, fs, creds, mode)
+ file.inode.init(file, fs, kuid, kgid, mode)
file.inode.nlink = 1 // from parent directory
return &file.inode
}
diff --git a/pkg/sentry/fsimpl/tmpfs/directory.go b/pkg/sentry/fsimpl/tmpfs/directory.go
index 70387cb9c..913b8a6c5 100644
--- a/pkg/sentry/fsimpl/tmpfs/directory.go
+++ b/pkg/sentry/fsimpl/tmpfs/directory.go
@@ -48,9 +48,9 @@ type directory struct {
childList dentryList
}
-func (fs *filesystem) newDirectory(creds *auth.Credentials, mode linux.FileMode) *directory {
+func (fs *filesystem) newDirectory(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode) *directory {
dir := &directory{}
- dir.inode.init(dir, fs, creds, linux.S_IFDIR|mode)
+ dir.inode.init(dir, fs, kuid, kgid, linux.S_IFDIR|mode)
dir.inode.nlink = 2 // from "." and parent directory or ".." for root
dir.dentry.inode = &dir.inode
dir.dentry.vfsd.Init(&dir.dentry)
diff --git a/pkg/sentry/fsimpl/tmpfs/filesystem.go b/pkg/sentry/fsimpl/tmpfs/filesystem.go
index 183eb975c..e801680e8 100644
--- a/pkg/sentry/fsimpl/tmpfs/filesystem.go
+++ b/pkg/sentry/fsimpl/tmpfs/filesystem.go
@@ -256,11 +256,12 @@ func (fs *filesystem) LinkAt(ctx context.Context, rp *vfs.ResolvingPath, vd vfs.
// MkdirAt implements vfs.FilesystemImpl.MkdirAt.
func (fs *filesystem) MkdirAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.MkdirOptions) error {
return fs.doCreateAt(rp, true /* dir */, func(parentDir *directory, name string) error {
+ creds := rp.Credentials()
if parentDir.inode.nlink == maxLinks {
return syserror.EMLINK
}
parentDir.inode.incLinksLocked() // from child's ".."
- childDir := fs.newDirectory(rp.Credentials(), opts.Mode)
+ childDir := fs.newDirectory(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode)
parentDir.insertChildLocked(&childDir.dentry, name)
return nil
})
@@ -269,18 +270,19 @@ func (fs *filesystem) MkdirAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
// MknodAt implements vfs.FilesystemImpl.MknodAt.
func (fs *filesystem) MknodAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.MknodOptions) error {
return fs.doCreateAt(rp, false /* dir */, func(parentDir *directory, name string) error {
+ creds := rp.Credentials()
var childInode *inode
switch opts.Mode.FileType() {
case 0, linux.S_IFREG:
- childInode = fs.newRegularFile(rp.Credentials(), opts.Mode)
+ childInode = fs.newRegularFile(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode)
case linux.S_IFIFO:
- childInode = fs.newNamedPipe(rp.Credentials(), opts.Mode)
+ childInode = fs.newNamedPipe(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode)
case linux.S_IFBLK:
- childInode = fs.newDeviceFile(rp.Credentials(), opts.Mode, vfs.BlockDevice, opts.DevMajor, opts.DevMinor)
+ childInode = fs.newDeviceFile(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode, vfs.BlockDevice, opts.DevMajor, opts.DevMinor)
case linux.S_IFCHR:
- childInode = fs.newDeviceFile(rp.Credentials(), opts.Mode, vfs.CharDevice, opts.DevMajor, opts.DevMinor)
+ childInode = fs.newDeviceFile(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode, vfs.CharDevice, opts.DevMajor, opts.DevMinor)
case linux.S_IFSOCK:
- childInode = fs.newSocketFile(rp.Credentials(), opts.Mode, opts.Endpoint)
+ childInode = fs.newSocketFile(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode, opts.Endpoint)
default:
return syserror.EINVAL
}
@@ -355,7 +357,8 @@ afterTrailingSymlink:
}
defer rp.Mount().EndWrite()
// Create and open the child.
- child := fs.newDentry(fs.newRegularFile(rp.Credentials(), opts.Mode))
+ creds := rp.Credentials()
+ child := fs.newDentry(fs.newRegularFile(creds.EffectiveKUID, creds.EffectiveKGID, opts.Mode))
parentDir.insertChildLocked(child, name)
fd, err := child.open(ctx, rp, &opts, true)
if err != nil {
@@ -676,7 +679,8 @@ func (fs *filesystem) StatFSAt(ctx context.Context, rp *vfs.ResolvingPath) (linu
// SymlinkAt implements vfs.FilesystemImpl.SymlinkAt.
func (fs *filesystem) SymlinkAt(ctx context.Context, rp *vfs.ResolvingPath, target string) error {
return fs.doCreateAt(rp, false /* dir */, func(parentDir *directory, name string) error {
- child := fs.newDentry(fs.newSymlink(rp.Credentials(), target))
+ creds := rp.Credentials()
+ child := fs.newDentry(fs.newSymlink(creds.EffectiveKUID, creds.EffectiveKGID, 0777, target))
parentDir.insertChildLocked(child, name)
return nil
})
diff --git a/pkg/sentry/fsimpl/tmpfs/named_pipe.go b/pkg/sentry/fsimpl/tmpfs/named_pipe.go
index 8d77b3fa8..739350cf0 100644
--- a/pkg/sentry/fsimpl/tmpfs/named_pipe.go
+++ b/pkg/sentry/fsimpl/tmpfs/named_pipe.go
@@ -30,9 +30,9 @@ type namedPipe struct {
// Preconditions:
// * fs.mu must be locked.
// * rp.Mount().CheckBeginWrite() has been called successfully.
-func (fs *filesystem) newNamedPipe(creds *auth.Credentials, mode linux.FileMode) *inode {
+func (fs *filesystem) newNamedPipe(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode) *inode {
file := &namedPipe{pipe: pipe.NewVFSPipe(true /* isNamed */, pipe.DefaultPipeSize, usermem.PageSize)}
- file.inode.init(file, fs, creds, linux.S_IFIFO|mode)
+ file.inode.init(file, fs, kuid, kgid, linux.S_IFIFO|mode)
file.inode.nlink = 1 // Only the parent has a link.
return &file.inode
}
diff --git a/pkg/sentry/fsimpl/tmpfs/regular_file.go b/pkg/sentry/fsimpl/tmpfs/regular_file.go
index fee174375..4f2ae04d2 100644
--- a/pkg/sentry/fsimpl/tmpfs/regular_file.go
+++ b/pkg/sentry/fsimpl/tmpfs/regular_file.go
@@ -85,12 +85,12 @@ type regularFile struct {
size uint64
}
-func (fs *filesystem) newRegularFile(creds *auth.Credentials, mode linux.FileMode) *inode {
+func (fs *filesystem) newRegularFile(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode) *inode {
file := &regularFile{
memFile: fs.memFile,
seals: linux.F_SEAL_SEAL,
}
- file.inode.init(file, fs, creds, linux.S_IFREG|mode)
+ file.inode.init(file, fs, kuid, kgid, linux.S_IFREG|mode)
file.inode.nlink = 1 // from parent directory
return &file.inode
}
diff --git a/pkg/sentry/fsimpl/tmpfs/socket_file.go b/pkg/sentry/fsimpl/tmpfs/socket_file.go
index 25c2321af..3ed650474 100644
--- a/pkg/sentry/fsimpl/tmpfs/socket_file.go
+++ b/pkg/sentry/fsimpl/tmpfs/socket_file.go
@@ -26,9 +26,9 @@ type socketFile struct {
ep transport.BoundEndpoint
}
-func (fs *filesystem) newSocketFile(creds *auth.Credentials, mode linux.FileMode, ep transport.BoundEndpoint) *inode {
+func (fs *filesystem) newSocketFile(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode, ep transport.BoundEndpoint) *inode {
file := &socketFile{ep: ep}
- file.inode.init(file, fs, creds, mode)
+ file.inode.init(file, fs, kuid, kgid, mode)
file.inode.nlink = 1 // from parent directory
return &file.inode
}
diff --git a/pkg/sentry/fsimpl/tmpfs/symlink.go b/pkg/sentry/fsimpl/tmpfs/symlink.go
index 47e075ed4..b0de5fabe 100644
--- a/pkg/sentry/fsimpl/tmpfs/symlink.go
+++ b/pkg/sentry/fsimpl/tmpfs/symlink.go
@@ -24,11 +24,11 @@ type symlink struct {
target string // immutable
}
-func (fs *filesystem) newSymlink(creds *auth.Credentials, target string) *inode {
+func (fs *filesystem) newSymlink(kuid auth.KUID, kgid auth.KGID, mode linux.FileMode, target string) *inode {
link := &symlink{
target: target,
}
- link.inode.init(link, fs, creds, linux.S_IFLNK|0777)
+ link.inode.init(link, fs, kuid, kgid, linux.S_IFLNK|mode)
link.inode.nlink = 1 // from parent directory
return &link.inode
}
diff --git a/pkg/sentry/fsimpl/tmpfs/tmpfs.go b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
index f0e098702..7ce1b86c7 100644
--- a/pkg/sentry/fsimpl/tmpfs/tmpfs.go
+++ b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
@@ -30,6 +30,7 @@ package tmpfs
import (
"fmt"
"math"
+ "strconv"
"strings"
"sync/atomic"
@@ -112,6 +113,58 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
}
}
+ mopts := vfs.GenericParseMountOptions(opts.Data)
+ rootMode := linux.FileMode(0777)
+ if rootFileType == linux.S_IFDIR {
+ rootMode = 01777
+ }
+ modeStr, ok := mopts["mode"]
+ if ok {
+ delete(mopts, "mode")
+ mode, err := strconv.ParseUint(modeStr, 8, 32)
+ if err != nil {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: invalid mode: %q", modeStr)
+ return nil, nil, syserror.EINVAL
+ }
+ rootMode = linux.FileMode(mode & 07777)
+ }
+ rootKUID := creds.EffectiveKUID
+ uidStr, ok := mopts["uid"]
+ if ok {
+ delete(mopts, "uid")
+ uid, err := strconv.ParseUint(uidStr, 10, 32)
+ if err != nil {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: invalid uid: %q", uidStr)
+ return nil, nil, syserror.EINVAL
+ }
+ kuid := creds.UserNamespace.MapToKUID(auth.UID(uid))
+ if !kuid.Ok() {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: unmapped uid: %d", uid)
+ return nil, nil, syserror.EINVAL
+ }
+ rootKUID = kuid
+ }
+ rootKGID := creds.EffectiveKGID
+ gidStr, ok := mopts["gid"]
+ if ok {
+ delete(mopts, "gid")
+ gid, err := strconv.ParseUint(gidStr, 10, 32)
+ if err != nil {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: invalid gid: %q", gidStr)
+ return nil, nil, syserror.EINVAL
+ }
+ kgid := creds.UserNamespace.MapToKGID(auth.GID(gid))
+ if !kgid.Ok() {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: unmapped gid: %d", gid)
+ return nil, nil, syserror.EINVAL
+ }
+ rootKGID = kgid
+ }
+ if len(mopts) != 0 {
+ ctx.Warningf("tmpfs.FilesystemType.GetFilesystem: unknown options: %v", mopts)
+ return nil, nil, syserror.EINVAL
+ }
+
devMinor, err := vfsObj.GetAnonBlockDevMinor()
if err != nil {
return nil, nil, err
@@ -127,11 +180,11 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
var root *dentry
switch rootFileType {
case linux.S_IFREG:
- root = fs.newDentry(fs.newRegularFile(creds, 0777))
+ root = fs.newDentry(fs.newRegularFile(rootKUID, rootKGID, rootMode))
case linux.S_IFLNK:
- root = fs.newDentry(fs.newSymlink(creds, tmpfsOpts.RootSymlinkTarget))
+ root = fs.newDentry(fs.newSymlink(rootKUID, rootKGID, rootMode, tmpfsOpts.RootSymlinkTarget))
case linux.S_IFDIR:
- root = &fs.newDirectory(creds, 01777).dentry
+ root = &fs.newDirectory(rootKUID, rootKGID, rootMode).dentry
default:
fs.vfsfs.DecRef()
return nil, nil, fmt.Errorf("invalid tmpfs root file type: %#o", rootFileType)
@@ -269,15 +322,15 @@ type inode struct {
const maxLinks = math.MaxUint32
-func (i *inode) init(impl interface{}, fs *filesystem, creds *auth.Credentials, mode linux.FileMode) {
+func (i *inode) init(impl interface{}, fs *filesystem, kuid auth.KUID, kgid auth.KGID, mode linux.FileMode) {
if mode.FileType() == 0 {
panic("file type is required in FileMode")
}
i.fs = fs
i.refs = 1
i.mode = uint32(mode)
- i.uid = uint32(creds.EffectiveKUID)
- i.gid = uint32(creds.EffectiveKGID)
+ i.uid = uint32(kuid)
+ i.gid = uint32(kgid)
i.ino = atomic.AddUint64(&fs.nextInoMinusOne, 1)
// Tmpfs creation sets atime, ctime, and mtime to current time.
now := fs.clock.Now().Nanoseconds()
@@ -562,6 +615,9 @@ func (i *inode) isDir() bool {
}
func (i *inode) touchAtime(mnt *vfs.Mount) {
+ if mnt.Flags.NoATime {
+ return
+ }
if err := mnt.CheckBeginWrite(); err != nil {
return
}
@@ -731,8 +787,7 @@ func NewMemfd(mount *vfs.Mount, creds *auth.Credentials, allowSeals bool, name s
// Per Linux, mm/shmem.c:__shmem_file_setup(), memfd inodes are set up with
// S_IRWXUGO.
- mode := linux.FileMode(0777)
- inode := fs.newRegularFile(creds, mode)
+ inode := fs.newRegularFile(creds.EffectiveKUID, creds.EffectiveKGID, 0777)
rf := inode.impl.(*regularFile)
if allowSeals {
rf.seals = 0
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 12:27:41 +0000