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-rw-r--r--pkg/sentry/vfs/file_description.go49
-rw-r--r--pkg/sentry/vfs/file_description_impl_util.go25
-rw-r--r--pkg/sentry/vfs/filesystem.go16
-rw-r--r--pkg/sentry/vfs/options.go14
-rw-r--r--pkg/sentry/vfs/testutil.go20
-rw-r--r--pkg/sentry/vfs/vfs.go87
6 files changed, 209 insertions, 2 deletions
diff --git a/pkg/sentry/vfs/file_description.go b/pkg/sentry/vfs/file_description.go
index 6575afd16..c5a9adca3 100644
--- a/pkg/sentry/vfs/file_description.go
+++ b/pkg/sentry/vfs/file_description.go
@@ -22,6 +22,7 @@ import (
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/memmap"
"gvisor.dev/gvisor/pkg/sentry/usermem"
+ "gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/waiter"
)
@@ -212,7 +213,21 @@ type FileDescriptionImpl interface {
// Ioctl implements the ioctl(2) syscall.
Ioctl(ctx context.Context, uio usermem.IO, args arch.SyscallArguments) (uintptr, error)
- // TODO: extended attributes; file locking
+ // Listxattr returns all extended attribute names for the file.
+ Listxattr(ctx context.Context) ([]string, error)
+
+ // Getxattr returns the value associated with the given extended attribute
+ // for the file.
+ Getxattr(ctx context.Context, name string) (string, error)
+
+ // Setxattr changes the value associated with the given extended attribute
+ // for the file.
+ Setxattr(ctx context.Context, opts SetxattrOptions) error
+
+ // Removexattr removes the given extended attribute from the file.
+ Removexattr(ctx context.Context, name string) error
+
+ // TODO: file locking
}
// Dirent holds the information contained in struct linux_dirent64.
@@ -329,6 +344,38 @@ func (fd *FileDescription) Ioctl(ctx context.Context, uio usermem.IO, args arch.
return fd.impl.Ioctl(ctx, uio, args)
}
+// Listxattr returns all extended attribute names for the file represented by
+// fd.
+func (fd *FileDescription) Listxattr(ctx context.Context) ([]string, error) {
+ names, err := fd.impl.Listxattr(ctx)
+ if err == syserror.ENOTSUP {
+ // Linux doesn't actually return ENOTSUP in this case; instead,
+ // fs/xattr.c:vfs_listxattr() falls back to allowing the security
+ // subsystem to return security extended attributes, which by default
+ // don't exist.
+ return nil, nil
+ }
+ return names, err
+}
+
+// Getxattr returns the value associated with the given extended attribute for
+// the file represented by fd.
+func (fd *FileDescription) Getxattr(ctx context.Context, name string) (string, error) {
+ return fd.impl.Getxattr(ctx, name)
+}
+
+// Setxattr changes the value associated with the given extended attribute for
+// the file represented by fd.
+func (fd *FileDescription) Setxattr(ctx context.Context, opts SetxattrOptions) error {
+ return fd.impl.Setxattr(ctx, opts)
+}
+
+// Removexattr removes the given extended attribute from the file represented
+// by fd.
+func (fd *FileDescription) Removexattr(ctx context.Context, name string) error {
+ return fd.impl.Removexattr(ctx, name)
+}
+
// SyncFS instructs the filesystem containing fd to execute the semantics of
// syncfs(2).
func (fd *FileDescription) SyncFS(ctx context.Context) error {
diff --git a/pkg/sentry/vfs/file_description_impl_util.go b/pkg/sentry/vfs/file_description_impl_util.go
index aae023254..3df49991c 100644
--- a/pkg/sentry/vfs/file_description_impl_util.go
+++ b/pkg/sentry/vfs/file_description_impl_util.go
@@ -127,6 +127,31 @@ func (FileDescriptionDefaultImpl) Ioctl(ctx context.Context, uio usermem.IO, arg
return 0, syserror.ENOTTY
}
+// Listxattr implements FileDescriptionImpl.Listxattr analogously to
+// inode_operations::listxattr == NULL in Linux.
+func (FileDescriptionDefaultImpl) Listxattr(ctx context.Context) ([]string, error) {
+ // This isn't exactly accurate; see FileDescription.Listxattr.
+ return nil, syserror.ENOTSUP
+}
+
+// Getxattr implements FileDescriptionImpl.Getxattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Getxattr(ctx context.Context, name string) (string, error) {
+ return "", syserror.ENOTSUP
+}
+
+// Setxattr implements FileDescriptionImpl.Setxattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Setxattr(ctx context.Context, opts SetxattrOptions) error {
+ return syserror.ENOTSUP
+}
+
+// Removexattr implements FileDescriptionImpl.Removexattr analogously to
+// inode::i_opflags & IOP_XATTR == 0 in Linux.
+func (FileDescriptionDefaultImpl) Removexattr(ctx context.Context, name string) error {
+ return syserror.ENOTSUP
+}
+
// DirectoryFileDescriptionDefaultImpl may be embedded by implementations of
// FileDescriptionImpl that always represent directories to obtain
// implementations of non-directory I/O methods that return EISDIR.
diff --git a/pkg/sentry/vfs/filesystem.go b/pkg/sentry/vfs/filesystem.go
index 8011eba3f..b766614e7 100644
--- a/pkg/sentry/vfs/filesystem.go
+++ b/pkg/sentry/vfs/filesystem.go
@@ -186,6 +186,20 @@ type FilesystemImpl interface {
// UnlinkAt removes the non-directory file at rp.
UnlinkAt(ctx context.Context, rp *ResolvingPath) error
+ // ListxattrAt returns all extended attribute names for the file at rp.
+ ListxattrAt(ctx context.Context, rp *ResolvingPath) ([]string, error)
+
+ // GetxattrAt returns the value associated with the given extended
+ // attribute for the file at rp.
+ GetxattrAt(ctx context.Context, rp *ResolvingPath, name string) (string, error)
+
+ // SetxattrAt changes the value associated with the given extended
+ // attribute for the file at rp.
+ SetxattrAt(ctx context.Context, rp *ResolvingPath, opts SetxattrOptions) error
+
+ // RemovexattrAt removes the given extended attribute from the file at rp.
+ RemovexattrAt(ctx context.Context, rp *ResolvingPath, name string) error
+
// PrependPath prepends a path from vd to vd.Mount().Root() to b.
//
// If vfsroot.Ok(), it is the contextual VFS root; if it is encountered
@@ -208,7 +222,7 @@ type FilesystemImpl interface {
// Preconditions: vd.Mount().Filesystem().Impl() == this FilesystemImpl.
PrependPath(ctx context.Context, vfsroot, vd VirtualDentry, b *fspath.Builder) error
- // TODO: extended attributes; inotify_add_watch(); bind()
+ // TODO: inotify_add_watch(); bind()
}
// PrependPathAtVFSRootError is returned by implementations of
diff --git a/pkg/sentry/vfs/options.go b/pkg/sentry/vfs/options.go
index 3ecbc8fc1..97ee4a446 100644
--- a/pkg/sentry/vfs/options.go
+++ b/pkg/sentry/vfs/options.go
@@ -101,6 +101,20 @@ type SetStatOptions struct {
Stat linux.Statx
}
+// SetxattrOptions contains options to VirtualFilesystem.SetxattrAt(),
+// FilesystemImpl.SetxattrAt(), FileDescription.Setxattr(), and
+// FileDescriptionImpl.Setxattr().
+type SetxattrOptions struct {
+ // Name is the name of the extended attribute being mutated.
+ Name string
+
+ // Value is the extended attribute's new value.
+ Value string
+
+ // Flags contains flags as specified for setxattr/lsetxattr/fsetxattr(2).
+ Flags uint32
+}
+
// StatOptions contains options to VirtualFilesystem.StatAt(),
// FilesystemImpl.StatAt(), FileDescription.Stat(), and
// FileDescriptionImpl.Stat().
diff --git a/pkg/sentry/vfs/testutil.go b/pkg/sentry/vfs/testutil.go
index 7a1d9e383..d94117bce 100644
--- a/pkg/sentry/vfs/testutil.go
+++ b/pkg/sentry/vfs/testutil.go
@@ -117,6 +117,26 @@ func (fs *FDTestFilesystem) UnlinkAt(ctx context.Context, rp *ResolvingPath) err
return syserror.EPERM
}
+// ListxattrAt implements FilesystemImpl.ListxattrAt.
+func (fs *FDTestFilesystem) ListxattrAt(ctx context.Context, rp *ResolvingPath) ([]string, error) {
+ return nil, syserror.EPERM
+}
+
+// GetxattrAt implements FilesystemImpl.GetxattrAt.
+func (fs *FDTestFilesystem) GetxattrAt(ctx context.Context, rp *ResolvingPath, name string) (string, error) {
+ return "", syserror.EPERM
+}
+
+// SetxattrAt implements FilesystemImpl.SetxattrAt.
+func (fs *FDTestFilesystem) SetxattrAt(ctx context.Context, rp *ResolvingPath, opts SetxattrOptions) error {
+ return syserror.EPERM
+}
+
+// RemovexattrAt implements FilesystemImpl.RemovexattrAt.
+func (fs *FDTestFilesystem) RemovexattrAt(ctx context.Context, rp *ResolvingPath, name string) error {
+ return syserror.EPERM
+}
+
// PrependPath implements FilesystemImpl.PrependPath.
func (fs *FDTestFilesystem) PrependPath(ctx context.Context, vfsroot, vd VirtualDentry, b *fspath.Builder) error {
b.PrependComponent(fmt.Sprintf("vfs.fdTestDentry:%p", vd.dentry.impl.(*fdTestDentry)))
diff --git a/pkg/sentry/vfs/vfs.go b/pkg/sentry/vfs/vfs.go
index 7262b0d0a..e60898d7c 100644
--- a/pkg/sentry/vfs/vfs.go
+++ b/pkg/sentry/vfs/vfs.go
@@ -440,6 +440,93 @@ func (vfs *VirtualFilesystem) UnlinkAt(ctx context.Context, creds *auth.Credenti
}
}
+// ListxattrAt returns all extended attribute names for the file at the given
+// path.
+func (vfs *VirtualFilesystem) ListxattrAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation) ([]string, error) {
+ rp, err := vfs.getResolvingPath(creds, pop)
+ if err != nil {
+ return nil, err
+ }
+ for {
+ names, err := rp.mount.fs.impl.ListxattrAt(ctx, rp)
+ if err == nil {
+ vfs.putResolvingPath(rp)
+ return names, nil
+ }
+ if err == syserror.ENOTSUP {
+ // Linux doesn't actually return ENOTSUP in this case; instead,
+ // fs/xattr.c:vfs_listxattr() falls back to allowing the security
+ // subsystem to return security extended attributes, which by
+ // default don't exist.
+ vfs.putResolvingPath(rp)
+ return nil, nil
+ }
+ if !rp.handleError(err) {
+ vfs.putResolvingPath(rp)
+ return nil, err
+ }
+ }
+}
+
+// GetxattrAt returns the value associated with the given extended attribute
+// for the file at the given path.
+func (vfs *VirtualFilesystem) GetxattrAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation, name string) (string, error) {
+ rp, err := vfs.getResolvingPath(creds, pop)
+ if err != nil {
+ return "", err
+ }
+ for {
+ val, err := rp.mount.fs.impl.GetxattrAt(ctx, rp, name)
+ if err == nil {
+ vfs.putResolvingPath(rp)
+ return val, nil
+ }
+ if !rp.handleError(err) {
+ vfs.putResolvingPath(rp)
+ return "", err
+ }
+ }
+}
+
+// SetxattrAt changes the value associated with the given extended attribute
+// for the file at the given path.
+func (vfs *VirtualFilesystem) SetxattrAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation, opts *SetxattrOptions) error {
+ rp, err := vfs.getResolvingPath(creds, pop)
+ if err != nil {
+ return err
+ }
+ for {
+ err := rp.mount.fs.impl.SetxattrAt(ctx, rp, *opts)
+ if err == nil {
+ vfs.putResolvingPath(rp)
+ return nil
+ }
+ if !rp.handleError(err) {
+ vfs.putResolvingPath(rp)
+ return err
+ }
+ }
+}
+
+// RemovexattrAt removes the given extended attribute from the file at rp.
+func (vfs *VirtualFilesystem) RemovexattrAt(ctx context.Context, creds *auth.Credentials, pop *PathOperation, name string) error {
+ rp, err := vfs.getResolvingPath(creds, pop)
+ if err != nil {
+ return err
+ }
+ for {
+ err := rp.mount.fs.impl.RemovexattrAt(ctx, rp, name)
+ if err == nil {
+ vfs.putResolvingPath(rp)
+ return nil
+ }
+ if !rp.handleError(err) {
+ vfs.putResolvingPath(rp)
+ return err
+ }
+ }
+}
+
// SyncAllFilesystems has the semantics of Linux's sync(2).
func (vfs *VirtualFilesystem) SyncAllFilesystems(ctx context.Context) error {
fss := make(map[*Filesystem]struct{})
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 22:55:27 +0000