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-rw-r--r--pkg/sentry/fsimpl/ext/filesystem.go2
-rw-r--r--pkg/sentry/fsimpl/ext/inode.go12
-rw-r--r--pkg/sentry/fsimpl/gofer/filesystem.go24
-rw-r--r--pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go4
-rw-r--r--pkg/sentry/fsimpl/kernfs/fd_impl_util.go6
-rw-r--r--pkg/sentry/fsimpl/kernfs/filesystem.go10
-rw-r--r--pkg/sentry/fsimpl/kernfs/inode_impl_util.go6
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs.go2
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs_test.go8
-rw-r--r--pkg/sentry/fsimpl/proc/subtasks.go4
-rw-r--r--pkg/sentry/fsimpl/proc/task.go4
-rw-r--r--pkg/sentry/fsimpl/proc/tasks.go4
-rw-r--r--pkg/sentry/fsimpl/sys/sys.go4
-rw-r--r--pkg/sentry/fsimpl/tmpfs/filesystem.go2
-rw-r--r--pkg/sentry/vfs/options.go5
-rw-r--r--pkg/sentry/vfs/permissions.go19
-rw-r--r--pkg/sentry/vfs/vfs.go19
17 files changed, 82 insertions, 53 deletions
diff --git a/pkg/sentry/fsimpl/ext/filesystem.go b/pkg/sentry/fsimpl/ext/filesystem.go
index 07bf58953..e05429d41 100644
--- a/pkg/sentry/fsimpl/ext/filesystem.go
+++ b/pkg/sentry/fsimpl/ext/filesystem.go
@@ -296,7 +296,7 @@ func (fs *filesystem) OpenAt(ctx context.Context, rp *vfs.ResolvingPath, opts vf
if vfs.MayWriteFileWithOpenFlags(opts.Flags) || opts.Flags&(linux.O_CREAT|linux.O_EXCL|linux.O_TMPFILE) != 0 {
return nil, syserror.EROFS
}
- return inode.open(rp, vfsd, opts.Flags)
+ return inode.open(rp, vfsd, &opts)
}
// ReadlinkAt implements vfs.FilesystemImpl.ReadlinkAt.
diff --git a/pkg/sentry/fsimpl/ext/inode.go b/pkg/sentry/fsimpl/ext/inode.go
index 191b39970..6962083f5 100644
--- a/pkg/sentry/fsimpl/ext/inode.go
+++ b/pkg/sentry/fsimpl/ext/inode.go
@@ -148,8 +148,8 @@ func newInode(fs *filesystem, inodeNum uint32) (*inode, error) {
}
// open creates and returns a file description for the dentry passed in.
-func (in *inode) open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
- ats := vfs.AccessTypesForOpenFlags(flags)
+func (in *inode) open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts *vfs.OpenOptions) (*vfs.FileDescription, error) {
+ ats := vfs.AccessTypesForOpenFlags(opts)
if err := in.checkPermissions(rp.Credentials(), ats); err != nil {
return nil, err
}
@@ -157,7 +157,7 @@ func (in *inode) open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*v
switch in.impl.(type) {
case *regularFile:
var fd regularFileFD
- if err := fd.vfsfd.Init(&fd, flags, mnt, vfsd, &vfs.FileDescriptionOptions{}); err != nil {
+ if err := fd.vfsfd.Init(&fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{}); err != nil {
return nil, err
}
return &fd.vfsfd, nil
@@ -168,17 +168,17 @@ func (in *inode) open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*v
return nil, syserror.EISDIR
}
var fd directoryFD
- if err := fd.vfsfd.Init(&fd, flags, mnt, vfsd, &vfs.FileDescriptionOptions{}); err != nil {
+ if err := fd.vfsfd.Init(&fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{}); err != nil {
return nil, err
}
return &fd.vfsfd, nil
case *symlink:
- if flags&linux.O_PATH == 0 {
+ if opts.Flags&linux.O_PATH == 0 {
// Can't open symlinks without O_PATH.
return nil, syserror.ELOOP
}
var fd symlinkFD
- fd.vfsfd.Init(&fd, flags, mnt, vfsd, &vfs.FileDescriptionOptions{})
+ fd.vfsfd.Init(&fd, opts.Flags, mnt, vfsd, &vfs.FileDescriptionOptions{})
return &fd.vfsfd, nil
default:
panic(fmt.Sprintf("unknown inode type: %T", in.impl))
diff --git a/pkg/sentry/fsimpl/gofer/filesystem.go b/pkg/sentry/fsimpl/gofer/filesystem.go
index 8eb61debf..138adb9f7 100644
--- a/pkg/sentry/fsimpl/gofer/filesystem.go
+++ b/pkg/sentry/fsimpl/gofer/filesystem.go
@@ -593,7 +593,7 @@ func (fs *filesystem) OpenAt(ctx context.Context, rp *vfs.ResolvingPath, opts vf
}
}
if rp.Done() {
- return start.openLocked(ctx, rp, opts.Flags)
+ return start.openLocked(ctx, rp, &opts)
}
afterTrailingSymlink:
@@ -633,12 +633,12 @@ afterTrailingSymlink:
start = parent
goto afterTrailingSymlink
}
- return child.openLocked(ctx, rp, opts.Flags)
+ return child.openLocked(ctx, rp, &opts)
}
// Preconditions: fs.renameMu must be locked.
-func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, flags uint32) (*vfs.FileDescription, error) {
- ats := vfs.AccessTypesForOpenFlags(flags)
+func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, opts *vfs.OpenOptions) (*vfs.FileDescription, error) {
+ ats := vfs.AccessTypesForOpenFlags(opts)
if err := d.checkPermissions(rp.Credentials(), ats, d.isDir()); err != nil {
return nil, err
}
@@ -646,11 +646,11 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, flags ui
filetype := d.fileType()
switch {
case filetype == linux.S_IFREG && !d.fs.opts.regularFilesUseSpecialFileFD:
- if err := d.ensureSharedHandle(ctx, ats&vfs.MayRead != 0, ats&vfs.MayWrite != 0, flags&linux.O_TRUNC != 0); err != nil {
+ if err := d.ensureSharedHandle(ctx, ats&vfs.MayRead != 0, ats&vfs.MayWrite != 0, opts.Flags&linux.O_TRUNC != 0); err != nil {
return nil, err
}
fd := &regularFileFD{}
- if err := fd.vfsfd.Init(fd, flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{
+ if err := fd.vfsfd.Init(fd, opts.Flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{
AllowDirectIO: true,
}); err != nil {
return nil, err
@@ -658,21 +658,21 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, flags ui
return &fd.vfsfd, nil
case filetype == linux.S_IFDIR:
// Can't open directories with O_CREAT.
- if flags&linux.O_CREAT != 0 {
+ if opts.Flags&linux.O_CREAT != 0 {
return nil, syserror.EISDIR
}
// Can't open directories writably.
if ats&vfs.MayWrite != 0 {
return nil, syserror.EISDIR
}
- if flags&linux.O_DIRECT != 0 {
+ if opts.Flags&linux.O_DIRECT != 0 {
return nil, syserror.EINVAL
}
if err := d.ensureSharedHandle(ctx, ats&vfs.MayRead != 0, false /* write */, false /* trunc */); err != nil {
return nil, err
}
fd := &directoryFD{}
- if err := fd.vfsfd.Init(fd, flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{}); err != nil {
+ if err := fd.vfsfd.Init(fd, opts.Flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{}); err != nil {
return nil, err
}
return &fd.vfsfd, nil
@@ -680,17 +680,17 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, flags ui
// Can't open symlinks without O_PATH (which is unimplemented).
return nil, syserror.ELOOP
default:
- if flags&linux.O_DIRECT != 0 {
+ if opts.Flags&linux.O_DIRECT != 0 {
return nil, syserror.EINVAL
}
- h, err := openHandle(ctx, d.file, ats&vfs.MayRead != 0, ats&vfs.MayWrite != 0, flags&linux.O_TRUNC != 0)
+ h, err := openHandle(ctx, d.file, ats&vfs.MayRead != 0, ats&vfs.MayWrite != 0, opts.Flags&linux.O_TRUNC != 0)
if err != nil {
return nil, err
}
fd := &specialFileFD{
handle: h,
}
- if err := fd.vfsfd.Init(fd, flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{}); err != nil {
+ if err := fd.vfsfd.Init(fd, opts.Flags, mnt, &d.vfsd, &vfs.FileDescriptionOptions{}); err != nil {
h.close(ctx)
return nil, err
}
diff --git a/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go b/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
index 733792c78..d092ccb2a 100644
--- a/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
+++ b/pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go
@@ -53,9 +53,9 @@ func (f *DynamicBytesFile) Init(creds *auth.Credentials, ino uint64, data vfs.Dy
}
// Open implements Inode.Open.
-func (f *DynamicBytesFile) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (f *DynamicBytesFile) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &DynamicBytesFD{}
- if err := fd.Init(rp.Mount(), vfsd, f.data, flags); err != nil {
+ if err := fd.Init(rp.Mount(), vfsd, f.data, opts.Flags); err != nil {
return nil, err
}
return &fd.vfsfd, nil
diff --git a/pkg/sentry/fsimpl/kernfs/fd_impl_util.go b/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
index 6104751c8..eda781155 100644
--- a/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
+++ b/pkg/sentry/fsimpl/kernfs/fd_impl_util.go
@@ -43,12 +43,12 @@ type GenericDirectoryFD struct {
}
// Init initializes a GenericDirectoryFD.
-func (fd *GenericDirectoryFD) Init(m *vfs.Mount, d *vfs.Dentry, children *OrderedChildren, flags uint32) error {
- if vfs.AccessTypesForOpenFlags(flags)&vfs.MayWrite != 0 {
+func (fd *GenericDirectoryFD) Init(m *vfs.Mount, d *vfs.Dentry, children *OrderedChildren, opts *vfs.OpenOptions) error {
+ if vfs.AccessTypesForOpenFlags(opts)&vfs.MayWrite != 0 {
// Can't open directories for writing.
return syserror.EISDIR
}
- if err := fd.vfsfd.Init(fd, flags, m, d, &vfs.FileDescriptionOptions{}); err != nil {
+ if err := fd.vfsfd.Init(fd, opts.Flags, m, d, &vfs.FileDescriptionOptions{}); err != nil {
return err
}
fd.children = children
diff --git a/pkg/sentry/fsimpl/kernfs/filesystem.go b/pkg/sentry/fsimpl/kernfs/filesystem.go
index e49303c26..ee98eb66a 100644
--- a/pkg/sentry/fsimpl/kernfs/filesystem.go
+++ b/pkg/sentry/fsimpl/kernfs/filesystem.go
@@ -365,7 +365,7 @@ func (fs *Filesystem) OpenAt(ctx context.Context, rp *vfs.ResolvingPath, opts vf
// appropriate bits in rp), but are returned by
// FileDescriptionImpl.StatusFlags().
opts.Flags &= linux.O_ACCMODE | linux.O_CREAT | linux.O_EXCL | linux.O_TRUNC | linux.O_DIRECTORY | linux.O_NOFOLLOW
- ats := vfs.AccessTypesForOpenFlags(opts.Flags)
+ ats := vfs.AccessTypesForOpenFlags(&opts)
// Do not create new file.
if opts.Flags&linux.O_CREAT == 0 {
@@ -379,7 +379,7 @@ func (fs *Filesystem) OpenAt(ctx context.Context, rp *vfs.ResolvingPath, opts vf
if err := inode.CheckPermissions(ctx, rp.Credentials(), ats); err != nil {
return nil, err
}
- return inode.Open(rp, vfsd, opts.Flags)
+ return inode.Open(rp, vfsd, opts)
}
// May create new file.
@@ -398,7 +398,7 @@ func (fs *Filesystem) OpenAt(ctx context.Context, rp *vfs.ResolvingPath, opts vf
if err := inode.CheckPermissions(ctx, rp.Credentials(), ats); err != nil {
return nil, err
}
- return inode.Open(rp, vfsd, opts.Flags)
+ return inode.Open(rp, vfsd, opts)
}
afterTrailingSymlink:
parentVFSD, parentInode, err := fs.walkParentDirLocked(ctx, rp)
@@ -438,7 +438,7 @@ afterTrailingSymlink:
return nil, err
}
parentVFSD.Impl().(*Dentry).InsertChild(pc, child)
- return child.Impl().(*Dentry).inode.Open(rp, child, opts.Flags)
+ return child.Impl().(*Dentry).inode.Open(rp, child, opts)
}
// Open existing file or follow symlink.
if mustCreate {
@@ -463,7 +463,7 @@ afterTrailingSymlink:
if err := childInode.CheckPermissions(ctx, rp.Credentials(), ats); err != nil {
return nil, err
}
- return childInode.Open(rp, childVFSD, opts.Flags)
+ return childInode.Open(rp, childVFSD, opts)
}
// ReadlinkAt implements vfs.FilesystemImpl.ReadlinkAt.
diff --git a/pkg/sentry/fsimpl/kernfs/inode_impl_util.go b/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
index adca2313f..099d70a16 100644
--- a/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
+++ b/pkg/sentry/fsimpl/kernfs/inode_impl_util.go
@@ -507,7 +507,7 @@ type InodeSymlink struct {
}
// Open implements Inode.Open.
-func (InodeSymlink) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (InodeSymlink) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
return nil, syserror.ELOOP
}
@@ -549,8 +549,8 @@ func (s *StaticDirectory) Init(creds *auth.Credentials, ino uint64, perm linux.F
}
// Open implements kernfs.Inode.
-func (s *StaticDirectory) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (s *StaticDirectory) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &s.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &s.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs.go b/pkg/sentry/fsimpl/kernfs/kernfs.go
index 79ebea8a5..c74fa999b 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs.go
@@ -303,7 +303,7 @@ type Inode interface {
// inode for its lifetime.
//
// Precondition: !rp.Done(). vfsd.Impl() must be a kernfs Dentry.
- Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error)
+ Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error)
}
type inodeRefs interface {
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index ee65cf491..96a16e654 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -113,9 +113,9 @@ func (fs *filesystem) newReadonlyDir(creds *auth.Credentials, mode linux.FileMod
return &dir.dentry
}
-func (d *readonlyDir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (d *readonlyDir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- if err := fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, flags); err != nil {
+ if err := fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, &opts); err != nil {
return nil, err
}
return fd.VFSFileDescription(), nil
@@ -143,9 +143,9 @@ func (fs *filesystem) newDir(creds *auth.Credentials, mode linux.FileMode, conte
return &dir.dentry
}
-func (d *dir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (d *dir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/proc/subtasks.go b/pkg/sentry/fsimpl/proc/subtasks.go
index 353e37195..102af0e93 100644
--- a/pkg/sentry/fsimpl/proc/subtasks.go
+++ b/pkg/sentry/fsimpl/proc/subtasks.go
@@ -114,9 +114,9 @@ func (i *subtasksInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallb
}
// Open implements kernfs.Inode.
-func (i *subtasksInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (i *subtasksInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/proc/task.go b/pkg/sentry/fsimpl/proc/task.go
index eb5bc62c0..2d814668a 100644
--- a/pkg/sentry/fsimpl/proc/task.go
+++ b/pkg/sentry/fsimpl/proc/task.go
@@ -98,9 +98,9 @@ func (i *taskInode) Valid(ctx context.Context) bool {
}
// Open implements kernfs.Inode.
-func (i *taskInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (i *taskInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/proc/tasks.go b/pkg/sentry/fsimpl/proc/tasks.go
index 14bd334e8..ebe21630c 100644
--- a/pkg/sentry/fsimpl/proc/tasks.go
+++ b/pkg/sentry/fsimpl/proc/tasks.go
@@ -205,9 +205,9 @@ func (i *tasksInode) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback
}
// Open implements kernfs.Inode.
-func (i *tasksInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (i *tasksInode) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &i.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go
index e35d52d17..d693fceae 100644
--- a/pkg/sentry/fsimpl/sys/sys.go
+++ b/pkg/sentry/fsimpl/sys/sys.go
@@ -97,9 +97,9 @@ func (d *dir) SetStat(fs *vfs.Filesystem, opts vfs.SetStatOptions) error {
}
// Open implements kernfs.Inode.Open.
-func (d *dir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, flags uint32) (*vfs.FileDescription, error) {
+func (d *dir) Open(rp *vfs.ResolvingPath, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
fd := &kernfs.GenericDirectoryFD{}
- fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, flags)
+ fd.Init(rp.Mount(), vfsd, &d.OrderedChildren, &opts)
return fd.VFSFileDescription(), nil
}
diff --git a/pkg/sentry/fsimpl/tmpfs/filesystem.go b/pkg/sentry/fsimpl/tmpfs/filesystem.go
index 72bc15264..8785452b6 100644
--- a/pkg/sentry/fsimpl/tmpfs/filesystem.go
+++ b/pkg/sentry/fsimpl/tmpfs/filesystem.go
@@ -334,7 +334,7 @@ afterTrailingSymlink:
}
func (d *dentry) open(ctx context.Context, rp *vfs.ResolvingPath, opts *vfs.OpenOptions, afterCreate bool) (*vfs.FileDescription, error) {
- ats := vfs.AccessTypesForOpenFlags(opts.Flags)
+ ats := vfs.AccessTypesForOpenFlags(opts)
if !afterCreate {
if err := d.inode.checkPermissions(rp.Credentials(), ats, d.inode.isDir()); err != nil {
return nil, err
diff --git a/pkg/sentry/vfs/options.go b/pkg/sentry/vfs/options.go
index b7774bf28..fdf8be157 100644
--- a/pkg/sentry/vfs/options.go
+++ b/pkg/sentry/vfs/options.go
@@ -72,6 +72,11 @@ type OpenOptions struct {
// If FilesystemImpl.OpenAt() creates a file, Mode is the file mode for the
// created file.
Mode linux.FileMode
+
+ // FileExec is set when the file is being opened to be executed.
+ // VirtualFilesystem.OpenAt() checks that the caller has execute permissions
+ // on the file, and that the file is a regular file.
+ FileExec bool
}
// ReadOptions contains options to FileDescription.PRead(),
diff --git a/pkg/sentry/vfs/permissions.go b/pkg/sentry/vfs/permissions.go
index f664581f4..8e250998a 100644
--- a/pkg/sentry/vfs/permissions.go
+++ b/pkg/sentry/vfs/permissions.go
@@ -103,17 +103,22 @@ func GenericCheckPermissions(creds *auth.Credentials, ats AccessTypes, isDir boo
// AccessTypesForOpenFlags returns MayRead|MayWrite in this case.
//
// Use May{Read,Write}FileWithOpenFlags() for these checks instead.
-func AccessTypesForOpenFlags(flags uint32) AccessTypes {
- switch flags & linux.O_ACCMODE {
+func AccessTypesForOpenFlags(opts *OpenOptions) AccessTypes {
+ ats := AccessTypes(0)
+ if opts.FileExec {
+ ats |= MayExec
+ }
+
+ switch opts.Flags & linux.O_ACCMODE {
case linux.O_RDONLY:
- if flags&linux.O_TRUNC != 0 {
- return MayRead | MayWrite
+ if opts.Flags&linux.O_TRUNC != 0 {
+ return ats | MayRead | MayWrite
}
- return MayRead
+ return ats | MayRead
case linux.O_WRONLY:
- return MayWrite
+ return ats | MayWrite
default:
- return MayRead | MayWrite
+ return ats | MayRead | MayWrite
}
}
diff --git a/pkg/sentry/vfs/vfs.go b/pkg/sentry/vfs/vfs.go
index 908c69f91..9629afee9 100644
--- a/pkg/sentry/vfs/vfs.go
+++ b/pkg/sentry/vfs/vfs.go
@@ -379,6 +379,25 @@ func (vfs *VirtualFilesystem) OpenAt(ctx context.Context, creds *auth.Credential
fd, err := rp.mount.fs.impl.OpenAt(ctx, rp, *opts)
if err == nil {
vfs.putResolvingPath(rp)
+
+ // TODO(gvisor.dev/issue/1193): Move inside fsimpl to avoid another call
+ // to FileDescription.Stat().
+ if opts.FileExec {
+ // Only a regular file can be executed.
+ stat, err := fd.Stat(ctx, StatOptions{Mask: linux.STATX_TYPE})
+ if err != nil {
+ return nil, err
+ }
+ if stat.Mask&linux.STATX_TYPE != 0 {
+ // This shouldn't happen, but if type can't be retrieved, file can't
+ // be executed.
+ return nil, syserror.EACCES
+ }
+ if linux.FileMode(stat.Mode).FileType() != linux.ModeRegular {
+ return nil, syserror.EACCES
+ }
+ }
+
return fd, nil
}
if !rp.handleError(err) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 20:45:14 +0000