deps: update to github.com/cyphar/filepath-securejoin@v0.2.3

The main change is the switch to Go 1.13-style "%w" error wrapping,
dropping one of the github.com/pkg/errors dependencies we have left.

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

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/cilium/ebpf v0.6.1
 	github.com/containerd/console v1.0.2
 	github.com/coreos/go-systemd/v22 v22.3.2
-	github.com/cyphar/filepath-securejoin v0.2.2
+	github.com/cyphar/filepath-securejoin v0.2.3
 	github.com/docker/go-units v0.4.0
 	github.com/godbus/dbus/v5 v5.0.4
 	github.com/moby/sys/mountinfo v0.4.1

go.sum

@@ -11,8 +11,8 @@ github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzA
 github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/cyphar/filepath-securejoin v0.2.2 h1:jCwT2GTP+PY5nBz3c/YL5PAIbusElVrPujOBSCj8xRg=
-github.com/cyphar/filepath-securejoin v0.2.2/go.mod h1:FpkQEhXnPnOthhzymB7CGsFk2G9VLXONKD9G7QGMM+4=
+github.com/cyphar/filepath-securejoin v0.2.3 h1:YX6ebbZCZP7VkM3scTTokDgBL2TY741X51MTk3ycuNI=
+github.com/cyphar/filepath-securejoin v0.2.3/go.mod h1:aPGpWjXOXUn2NCNjFvBE6aRxGGx79pTxQpKOJNYHHl4=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=

vendor/github.com/cyphar/filepath-securejoin/.travis.yml

@@ -4,10 +4,12 @@
 
 language: go
 go:
-    - 1.7.x
-    - 1.8.x
+    - 1.13.x
+    - 1.16.x
     - tip
-
+arch:
+    - AMD64
+    - ppc64le
 os:
     - linux
     - osx

vendor/github.com/cyphar/filepath-securejoin/README.md

@@ -7,6 +7,19 @@ standard library][go#20126]. The purpose of this function is to be a "secure"
 alternative to `filepath.Join`, and in particular it provides certain
 guarantees that are not provided by `filepath.Join`.
 
+> **NOTE**: This code is *only* safe if you are not at risk of other processes
+> modifying path components after you've used `SecureJoin`. If it is possible
+> for a malicious process to modify path components of the resolved path, then
+> you will be vulnerable to some fairly trivial TOCTOU race conditions. [There
+> are some Linux kernel patches I'm working on which might allow for a better
+> solution.][lwn-obeneath]
+>
+> In addition, with a slightly modified API it might be possible to use
+> `O_PATH` and verify that the opened path is actually the resolved one -- but
+> I have not done that yet. I might add it in the future as a helper function
+> to help users verify the path (we can't just return `/proc/self/fd/<foo>`
+> because that doesn't always work transparently for all users).
+
 This is the function prototype:
 
 ```go
@@ -16,8 +29,8 @@ func SecureJoin(root, unsafePath string) (string, error)
 This library **guarantees** the following:
 
 * If no error is set, the resulting string **must** be a child path of
-  `SecureJoin` and will not contain any symlink path components (they will all
-  be expanded).
+  `root` and will not contain any symlink path components (they will all be
+  expanded).
 
 * When expanding symlinks, all symlink path components **must** be resolved
   relative to the provided root. In particular, this can be considered a
@@ -25,7 +38,7 @@ This library **guarantees** the following:
   these symlinks will **not** be expanded lexically (`filepath.Clean` is not
   called on the input before processing).
 
-* Non-existant path components are unaffected by `SecureJoin` (similar to
+* Non-existent path components are unaffected by `SecureJoin` (similar to
   `filepath.EvalSymlinks`'s semantics).
 
 * The returned path will always be `filepath.Clean`ed and thus not contain any
@@ -57,6 +70,7 @@ func SecureJoin(root, unsafePath string) (string, error) {
 }
 ```
 
+[lwn-obeneath]: https://lwn.net/Articles/767547/
 [go#20126]: https://github.com/golang/go/issues/20126
 
 ### License ###

vendor/github.com/cyphar/filepath-securejoin/VERSION

@@ -1 +1 @@
-0.2.2
+0.2.3

vendor/github.com/cyphar/filepath-securejoin/go.mod

@@ -0,0 +1,3 @@
+module github.com/cyphar/filepath-securejoin
+
+go 1.13

vendor/github.com/cyphar/filepath-securejoin/join.go

@@ -12,39 +12,20 @@ package securejoin
 
 import (
 	"bytes"
+	"errors"
 	"os"
 	"path/filepath"
 	"strings"
 	"syscall"
-
-	"github.com/pkg/errors"
 )
 
-// ErrSymlinkLoop is returned by SecureJoinVFS when too many symlinks have been
-// evaluated in attempting to securely join the two given paths.
-var ErrSymlinkLoop = errors.Wrap(syscall.ELOOP, "secure join")
-
 // IsNotExist tells you if err is an error that implies that either the path
 // accessed does not exist (or path components don't exist). This is
 // effectively a more broad version of os.IsNotExist.
 func IsNotExist(err error) bool {
-	// If it's a bone-fide ENOENT just bail.
-	if os.IsNotExist(errors.Cause(err)) {
-		return true
-	}
-
 	// Check that it's not actually an ENOTDIR, which in some cases is a more
 	// convoluted case of ENOENT (usually involving weird paths).
-	var errno error
-	switch err := errors.Cause(err).(type) {
-	case *os.PathError:
-		errno = err.Err
-	case *os.LinkError:
-		errno = err.Err
-	case *os.SyscallError:
-		errno = err.Err
-	}
-	return errno == syscall.ENOTDIR || errno == syscall.ENOENT
+	return errors.Is(err, os.ErrNotExist) || errors.Is(err, syscall.ENOTDIR) || errors.Is(err, syscall.ENOENT)
 }
 
 // SecureJoinVFS joins the two given path components (similar to Join) except
@@ -68,7 +49,7 @@ func SecureJoinVFS(root, unsafePath string, vfs VFS) (string, error) {
 	n := 0
 	for unsafePath != "" {
 		if n > 255 {
-			return "", ErrSymlinkLoop
+			return "", &os.PathError{Op: "SecureJoin", Path: root + "/" + unsafePath, Err: syscall.ELOOP}
 		}
 
 		// Next path component, p.

vendor/github.com/cyphar/filepath-securejoin/vendor.conf

@@ -1 +0,0 @@
-github.com/pkg/errors v0.8.0

vendor/modules.txt

@@ -17,7 +17,7 @@ github.com/coreos/go-systemd/v22/activation
 github.com/coreos/go-systemd/v22/dbus
 # github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
 github.com/cpuguy83/go-md2man/v2/md2man
-# github.com/cyphar/filepath-securejoin v0.2.2
+# github.com/cyphar/filepath-securejoin v0.2.3
 github.com/cyphar/filepath-securejoin
 # github.com/docker/go-units v0.4.0
 github.com/docker/go-units