libct/utils: remove Deprecated functions

These were all marked for deprecation in runc 1.5.0, so remove them now
to make sure we don't forget.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

libcontainer/utils/utils.go

@@ -7,8 +7,6 @@ import (
 	"strings"
 
 	"golang.org/x/sys/unix"
-
-	"github.com/opencontainers/runc/internal/pathrs"
 )
 
 const (
@@ -67,23 +65,3 @@ func Annotations(labels []string) (bundle string, userAnnotations map[string]str
 	}
 	return bundle, userAnnotations
 }
-
-// CleanPath makes a path safe for use with filepath.Join. This is done by not
-// only cleaning the path, but also (if the path is relative) adding a leading
-// '/' and cleaning it (then removing the leading '/'). This ensures that a
-// path resulting from prepending another path will always resolve to lexically
-// be a subdirectory of the prefixed path. This is all done lexically, so paths
-// that include symlinks won't be safe as a result of using CleanPath.
-//
-// Deprecated: This function has been moved to internal/pathrs and this wrapper
-// will be removed in runc 1.5.
-var CleanPath = pathrs.LexicallyCleanPath
-
-// StripRoot returns the passed path, stripping the root path if it was
-// (lexicially) inside it. Note that both passed paths will always be treated
-// as absolute, and the returned path will also always be absolute. In
-// addition, the paths are cleaned before stripping the root.
-//
-// Deprecated: This function has been moved to internal/pathrs and this wrapper
-// will be removed in runc 1.5.
-var StripRoot = pathrs.LexicallyStripRoot

libcontainer/utils/utils_unix.go

@@ -6,13 +6,11 @@ import (
 	"fmt"
 	"math"
 	"os"
-	"path/filepath"
 	"runtime"
 	"strconv"
 	"sync"
 	_ "unsafe" // for go:linkname
 
-	securejoin "github.com/cyphar/filepath-securejoin"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 
@@ -146,44 +144,6 @@ func NewSockPair(name string) (parent, child *os.File, err error) {
 	return os.NewFile(uintptr(fds[1]), name+"-p"), os.NewFile(uintptr(fds[0]), name+"-c"), nil
 }
 
-// WithProcfd runs the passed closure with a procfd path (/proc/self/fd/...)
-// corresponding to the unsafePath resolved within the root. Before passing the
-// fd, this path is verified to have been inside the root -- so operating on it
-// through the passed fdpath should be safe. Do not access this path through
-// the original path strings, and do not attempt to use the pathname outside of
-// the passed closure (the file handle will be freed once the closure returns).
-//
-// Deprecated: This function is an internal implementation detail of runc and
-// is no longer used. It will be removed in runc 1.5.
-func WithProcfd(root, unsafePath string, fn func(procfd string) error) error {
-	// Remove the root then forcefully resolve inside the root.
-	unsafePath = pathrs.LexicallyStripRoot(root, unsafePath)
-	fullPath, err := securejoin.SecureJoin(root, unsafePath)
-	if err != nil {
-		return fmt.Errorf("resolving path inside rootfs failed: %w", err)
-	}
-
-	procSelfFd, closer := ProcThreadSelf("fd/")
-	defer closer()
-
-	// Open the target path.
-	fh, err := os.OpenFile(fullPath, unix.O_PATH|unix.O_CLOEXEC, 0)
-	if err != nil {
-		return fmt.Errorf("open o_path procfd: %w", err)
-	}
-	defer fh.Close()
-
-	procfd := filepath.Join(procSelfFd, strconv.Itoa(int(fh.Fd())))
-	// Double-check the path is the one we expected.
-	if realpath, err := os.Readlink(procfd); err != nil {
-		return fmt.Errorf("procfd verification failed: %w", err)
-	} else if realpath != fullPath {
-		return fmt.Errorf("possibly malicious path detected -- refusing to operate on %s", realpath)
-	}
-
-	return fn(procfd)
-}
-
 // WithProcfdFile is a very minimal wrapper around [ProcThreadSelfFd]. The
 // caller is responsible for making sure that the provided file handle is
 // actually safe to operate on.