[kirkstone] go: fix CVE-2022-2879 and CVE-2022-41720

Backport appropriate patches to fix CVE-2022-2879 and CVE-2022-41720.

Modified the original fix for CVE-2022-2879 to remove a testdata tarball
and any references to it since git binary diffs are not supported in quilt.

Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
---
 meta/recipes-devtools/go/go-1.17.13.inc       |  36 +-
 ...01-archive-tar-limit-size-of-headers.patch | 177 ++++++
 ...d-escapes-from-os.DirFS-and-http.Dir.patch | 514 ++++++++++++++++++
 3 files changed, 710 insertions(+), 17 deletions(-)
 create mode 100644 meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
 create mode 100644 meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch

On 2023-03-20 16:09, Sakib Sajal via lists.openembedded.org wrote:
> Backport appropriate patches to fix CVE-2022-2879 and CVE-2022-41720.
>
> Modified the original fix for CVE-2022-2879 to remove a testdata tarball
> and any references to it since git binary diffs are not supported in quilt.
>
> Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
> ---
>   meta/recipes-devtools/go/go-1.17.13.inc       |  36 +-
>   ...01-archive-tar-limit-size-of-headers.patch | 177 ++++++
>   ...d-escapes-from-os.DirFS-and-http.Dir.patch | 514 ++++++++++++++++++
>   3 files changed, 710 insertions(+), 17 deletions(-)
>   create mode 100644 meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
>   create mode 100644 meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
>
> diff --git a/meta/recipes-devtools/go/go-1.17.13.inc b/meta/recipes-devtools/go/go-1.17.13.inc
> index 99662bd298..f5cf192361 100644
> --- a/meta/recipes-devtools/go/go-1.17.13.inc
> +++ b/meta/recipes-devtools/go/go-1.17.13.inc
> @@ -4,23 +4,25 @@ FILESEXTRAPATHS:prepend := "${FILE_DIRNAME}/go-1.18:"
>   
>   LIC_FILES_CHKSUM ="file://LICENSE;md5=5d4950ecb7b26d2c5e4e7b4e0dd74707"
>   
> -SRC_URI += "\
> -file://0001-allow-CC-and-CXX-to-have-multiple-words.patch  \
> -file://0002-cmd-go-make-content-based-hash-generation-less-pedan.patch  \
> -file://0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch  \
> -file://0004-ld-add-soname-to-shareable-objects.patch  \
> -file://0005-make.bash-override-CC-when-building-dist-and-go_boot.patch  \
> -file://0006-cmd-dist-separate-host-and-target-builds.patch  \
> -file://0007-cmd-go-make-GOROOT-precious-by-default.patch  \
> -file://0008-use-GOBUILDMODE-to-set-buildmode.patch  \
> -file://0009-Revert-cmd-go-make-sure-CC-and-CXX-are-absolute.patch  \
> -file://0001-exec.go-do-not-write-linker-flags-into-buildids.patch  \
> -file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch  \
> -file://CVE-2022-27664.patch  \
> -file://0001-net-http-httputil-avoid-query-parameter-smuggling.patch  \
> -file://CVE-2022-41715.patch  \
> -file://CVE-2022-41717.patch  \
> -"
> +SRC_URI = "https://golang.org/dl/go${PV}.src.tar.gz;name=main \


Nack.


Sakib,

You said this works for you but if you look at:

❯ cat meta/recipes-devtools/go/go-1.17.13.inc
require go-common.inc

FILESEXTRAPATHS:prepend := "${FILE_DIRNAME}/go-1.18:"

LIC_FILES_CHKSUM = "file://LICENSE;md5=5d4950ecb7b26d2c5e4e7b4e0dd74707"

SRC_URI += "\
  ...

and then

❯ grep SRC_URI meta/recipes-devtools/go/go-common.inc
SRC_URI = "https://golang.org/dl/go${PV}.src.tar.gz;name=main"

You see that you should stick with the += operator.

I think you said that devtool changed that , right?

If so, and if we can learn why this change even built for you,
then consider opening a bug against devtool.

../Randy


> +file://0001-allow-CC-and-CXX-to-have-multiple-words.patch  \
> +file://0002-cmd-go-make-content-based-hash-generation-less-pedan.patch  \
> +file://0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch  \
> +file://0004-ld-add-soname-to-shareable-objects.patch  \
> +file://0005-make.bash-override-CC-when-building-dist-and-go_boot.patch  \
> +file://0006-cmd-dist-separate-host-and-target-builds.patch  \
> +file://0007-cmd-go-make-GOROOT-precious-by-default.patch  \
> +file://0008-use-GOBUILDMODE-to-set-buildmode.patch  \
> +file://0009-Revert-cmd-go-make-sure-CC-and-CXX-are-absolute.patch  \
> +file://0001-exec.go-do-not-write-linker-flags-into-buildids.patch  \
> +file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch  \
> +file://CVE-2022-27664.patch  \
> +file://0001-net-http-httputil-avoid-query-parameter-smuggling.patch  \
> +file://CVE-2022-41715.patch  \
> +file://CVE-2022-41717.patch  \
> +file://0001-archive-tar-limit-size-of-headers.patch  \
> +file://0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch  \
> +           "
>   SRC_URI[main.sha256sum] = "a1a48b23afb206f95e7bbaa9b898d965f90826f6f1d1fc0c1d784ada0cd300fd"
>   
>   # Upstream don't believe it is a signifiant real world issue and will only
> diff --git a/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch b/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
> new file mode 100644
> index 0000000000..0315e1a3ee
> --- /dev/null
> +++ b/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
> @@ -0,0 +1,177 @@
> +From d064ed520a7cc6b480f9565e30751e695d394f4e Mon Sep 17 00:00:00 2001
> +From: Damien Neil<dneil@google.com>
> +Date: Fri, 2 Sep 2022 20:45:18 -0700
> +Subject: [PATCH] archive/tar: limit size of headers
> +
> +Set a 1MiB limit on special file blocks (PAX headers, GNU long names,
> +GNU link names), to avoid reading arbitrarily large amounts of data
> +into memory.
> +
> +Thanks to Adam Korczynski (ADA Logics) and OSS-Fuzz for reporting
> +this issue.
> +
> +Fixes CVE-2022-2879
> +Updates #54853
> +Fixes #55925
> +
> +Change-Id: I85136d6ff1e0af101a112190e027987ab4335680
> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1565555
> +Reviewed-by: Tatiana Bradley<tatianabradley@google.com>
> +Run-TryBot: Roland Shoemaker<bracewell@google.com>
> +Reviewed-by: Roland Shoemaker<bracewell@google.com>
> +(cherry picked from commit 6ee768cef6b82adf7a90dcf367a1699ef694f3b2)
> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1590622
> +Reviewed-by: Damien Neil<dneil@google.com>
> +Reviewed-by: Julie Qiu<julieqiu@google.com>
> +Reviewed-on:https://go-review.googlesource.com/c/go/+/438500
> +Reviewed-by: Dmitri Shuralyov<dmitshur@golang.org>
> +Reviewed-by: Carlos Amedee<carlos@golang.org>
> +Reviewed-by: Dmitri Shuralyov<dmitshur@google.com>
> +Run-TryBot: Carlos Amedee<carlos@golang.org>
> +TryBot-Result: Gopher Robot<gobot@golang.org>
> +
> +CVE: CVE-2022-2879
> +Upstream-Status: Backport [0a723816cd205576945fa57fbdde7e6532d59d08]
> +Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
> +---
> + src/archive/tar/format.go      |  4 ++++
> + src/archive/tar/reader.go      | 14 ++++++++++++--
> + src/archive/tar/reader_test.go |  8 +++++++-
> + src/archive/tar/writer.go      |  3 +++
> + src/archive/tar/writer_test.go | 27 +++++++++++++++++++++++++++
> + 5 files changed, 53 insertions(+), 3 deletions(-)
> +
> +diff --git a/src/archive/tar/format.go b/src/archive/tar/format.go
> +index cfe24a5..6642364 100644
> +--- a/src/archive/tar/format.go
> ++++ b/src/archive/tar/format.go
> +@@ -143,6 +143,10 @@ const (
> + 	blockSize  = 512 // Size of each block in a tar stream
> + 	nameSize   = 100 // Max length of the name field in USTAR format
> + 	prefixSize = 155 // Max length of the prefix field in USTAR format
> ++
> ++	// Max length of a special file (PAX header, GNU long name or link).
> ++	// This matches the limit used by libarchive.
> ++	maxSpecialFileSize = 1 << 20
> + )
> +
> + // blockPadding computes the number of bytes needed to pad offset up to the
> +diff --git a/src/archive/tar/reader.go b/src/archive/tar/reader.go
> +index 1b1d5b4..f645af8 100644
> +--- a/src/archive/tar/reader.go
> ++++ b/src/archive/tar/reader.go
> +@@ -103,7 +103,7 @@ func (tr *Reader) next() (*Header, error) {
> + 			continue // This is a meta header affecting the next header
> + 		case TypeGNULongName, TypeGNULongLink:
> + 			format.mayOnlyBe(FormatGNU)
> +-			realname, err := io.ReadAll(tr)
> ++			realname, err := readSpecialFile(tr)
> + 			if err != nil {
> + 				return nil, err
> + 			}
> +@@ -293,7 +293,7 @@ func mergePAX(hdr *Header, paxHdrs map[string]string) (err error) {
> + // parsePAX parses PAX headers.
> + // If an extended header (type 'x') is invalid, ErrHeader is returned
> + func parsePAX(r io.Reader) (map[string]string, error) {
> +-	buf, err := io.ReadAll(r)
> ++	buf, err := readSpecialFile(r)
> + 	if err != nil {
> + 		return nil, err
> + 	}
> +@@ -826,6 +826,16 @@ func tryReadFull(r io.Reader, b []byte) (n int, err error) {
> + 	return n, err
> + }
> +
> ++// readSpecialFile is like io.ReadAll except it returns
> ++// ErrFieldTooLong if more than maxSpecialFileSize is read.
> ++func readSpecialFile(r io.Reader) ([]byte, error) {
> ++	buf, err := io.ReadAll(io.LimitReader(r, maxSpecialFileSize+1))
> ++	if len(buf) > maxSpecialFileSize {
> ++		return nil, ErrFieldTooLong
> ++	}
> ++	return buf, err
> ++}
> ++
> + // discard skips n bytes in r, reporting an error if unable to do so.
> + func discard(r io.Reader, n int64) error {
> + 	// If possible, Seek to the last byte before the end of the data section.
> +diff --git a/src/archive/tar/reader_test.go b/src/archive/tar/reader_test.go
> +index 789ddc1..926dc3d 100644
> +--- a/src/archive/tar/reader_test.go
> ++++ b/src/archive/tar/reader_test.go
> +@@ -6,6 +6,7 @@ package tar
> +
> + import (
> + 	"bytes"
> ++	"compress/bzip2"
> + 	"crypto/md5"
> + 	"errors"
> + 	"fmt" +@@ -625,9 +626,14 @@ func TestReader(t *testing.T) { + } + defer 
> f.Close() + ++ var fr io.Reader = f ++ if strings.HasSuffix(v.file, ".bz2") {
> ++				fr = bzip2.NewReader(fr)
> ++			}
> ++
> + 			// Capture all headers and checksums.
> + 			var (
> +-				tr      = NewReader(f)
> ++				tr      = NewReader(fr)
> + 				hdrs    []*Header
> + 				chksums []string
> + 				rdbuf   = make([]byte, 8)
> +diff --git a/src/archive/tar/writer.go b/src/archive/tar/writer.go
> +index e80498d..893eac0 100644
> +--- a/src/archive/tar/writer.go
> ++++ b/src/archive/tar/writer.go
> +@@ -199,6 +199,9 @@ func (tw *Writer) writePAXHeader(hdr *Header, paxHdrs map[string]string) error {
> + 			flag = TypeXHeader
> + 		}
> + 		data := buf.String()
> ++		if len(data) > maxSpecialFileSize {
> ++			return ErrFieldTooLong
> ++		}
> + 		if err := tw.writeRawFile(name, data, flag, FormatPAX); err != nil || isGlobal {
> + 			return err // Global headers return here
> + 		}
> +diff --git a/src/archive/tar/writer_test.go b/src/archive/tar/writer_test.go
> +index a00f02d..4e709e5 100644
> +--- a/src/archive/tar/writer_test.go
> ++++ b/src/archive/tar/writer_test.go
> +@@ -1006,6 +1006,33 @@ func TestIssue12594(t *testing.T) {
> + 	}
> + }
> +
> ++func TestWriteLongHeader(t *testing.T) {
> ++	for _, test := range []struct {
> ++		name string
> ++		h    *Header
> ++	}{{
> ++		name: "name too long",
> ++		h:    &Header{Name: strings.Repeat("a", maxSpecialFileSize)},
> ++	}, {
> ++		name: "linkname too long",
> ++		h:    &Header{Linkname: strings.Repeat("a", maxSpecialFileSize)},
> ++	}, {
> ++		name: "uname too long",
> ++		h:    &Header{Uname: strings.Repeat("a", maxSpecialFileSize)},
> ++	}, {
> ++		name: "gname too long",
> ++		h:    &Header{Gname: strings.Repeat("a", maxSpecialFileSize)},
> ++	}, {
> ++		name: "PAX header too long",
> ++		h:    &Header{PAXRecords: map[string]string{"GOLANG.x": strings.Repeat("a", maxSpecialFileSize)}},
> ++	}} {
> ++		w := NewWriter(io.Discard)
> ++		if err := w.WriteHeader(test.h); err != ErrFieldTooLong {
> ++			t.Errorf("%v: w.WriteHeader() = %v, want ErrFieldTooLong", test.name, err)
> ++		}
> ++	}
> ++}
> ++
> + // testNonEmptyWriter wraps an io.Writer and ensures that
> + // Write is never called with an empty buffer.
> + type testNonEmptyWriter struct{ io.Writer }
> diff --git a/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch b/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
> new file mode 100644
> index 0000000000..6c2e8804b3
> --- /dev/null
> +++ b/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
> @@ -0,0 +1,514 @@
> +From f8896a97a0630b0f2f8c488310147f7f20b3ec7d Mon Sep 17 00:00:00 2001
> +From: Damien Neil<dneil@google.com>
> +Date: Thu, 10 Nov 2022 12:16:27 -0800
> +Subject: [PATCH] os, net/http: avoid escapes from os.DirFS and http.Dir on
> + Windows
> +
> +Do not permit access to Windows reserved device names (NUL, COM1, etc.)
> +via os.DirFS and http.Dir filesystems.
> +
> +Avoid escapes from os.DirFS(`\`) on Windows. DirFS would join the
> +the root to the relative path with a path separator, making
> +os.DirFS(`\`).Open(`/foo/bar`) open the path `\\foo\bar`, which is
> +a UNC name. Not only does this not open the intended file, but permits
> +reference to any file on the system rather than only files on the
> +current drive.
> +
> +Make os.DirFS("") invalid, with all file access failing. Previously,
> +a root of "" was interpreted as "/", which is surprising and probably
> +unintentional.
> +
> +Fixes CVE-2022-41720.
> +Fixes #56694.
> +
> +Change-Id: I275b5fa391e6ad7404309ea98ccc97405942e0f0
> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1663832
> +Reviewed-by: Julie Qiu<julieqiu@google.com>
> +Reviewed-by: Tatiana Bradley<tatianabradley@google.com>
> +Reviewed-on:https://go-review.googlesource.com/c/go/+/455360
> +Reviewed-by: Michael Pratt<mpratt@google.com>
> +TryBot-Result: Gopher Robot<gobot@golang.org>
> +Run-TryBot: Jenny Rakoczy<jenny@golang.org>
> +
> +CVE: CVE-2022-41720
> +Upstream-Status: Backport [7013a4f5f816af62033ad63dd06b77c30d7a62a7]
> +Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
> +---
> + src/go/build/deps_test.go                 |  1 +
> + src/internal/safefilepath/path.go         | 21 +++++
> + src/internal/safefilepath/path_other.go   | 23 ++++++
> + src/internal/safefilepath/path_test.go    | 88 +++++++++++++++++++++
> + src/internal/safefilepath/path_windows.go | 95 +++++++++++++++++++++++
> + src/net/http/fs.go                        |  8 +-
> + src/net/http/fs_test.go                   | 28 +++++++
> + src/os/file.go                            | 36 +++++++--
> + src/os/os_test.go                         | 38 +++++++++
> + 9 files changed, 328 insertions(+), 10 deletions(-)
> + create mode 100644 src/internal/safefilepath/path.go
> + create mode 100644 src/internal/safefilepath/path_other.go
> + create mode 100644 src/internal/safefilepath/path_test.go
> + create mode 100644 src/internal/safefilepath/path_windows.go
> +
> +diff --git a/src/go/build/deps_test.go b/src/go/build/deps_test.go
> +index 45e2f25..dc3bb8c 100644
> +--- a/src/go/build/deps_test.go
> ++++ b/src/go/build/deps_test.go
> +@@ -165,6 +165,7 @@ var depsRules = `
> + 	io/fs
> + 	< internal/testlog
> + 	< internal/poll
> ++	< internal/safefilepath
> + 	< os
> + 	< os/signal;
> +
> +diff --git a/src/internal/safefilepath/path.go b/src/internal/safefilepath/path.go
> +new file mode 100644
> +index 0000000..0f0a270
> +--- /dev/null
> ++++ b/src/internal/safefilepath/path.go
> +@@ -0,0 +1,21 @@
> ++// Copyright 2022 The Go Authors. All rights reserved.
> ++// Use of this source code is governed by a BSD-style
> ++// license that can be found in the LICENSE file.
> ++
> ++// Package safefilepath manipulates operating-system file paths.
> ++package safefilepath
> ++
> ++import (
> ++	"errors"
> ++)
> ++
> ++var errInvalidPath = errors.New("invalid path")
> ++
> ++// FromFS converts a slash-separated path into an operating-system path.
> ++//
> ++// FromFS returns an error if the path cannot be represented by the operating
> ++// system. For example, paths containing '\' and ':' characters are rejected
> ++// on Windows.
> ++func FromFS(path string) (string, error) {
> ++	return fromFS(path)
> ++}
> +diff --git a/src/internal/safefilepath/path_other.go b/src/internal/safefilepath/path_other.go
> +new file mode 100644
> +index 0000000..f93da18
> +--- /dev/null
> ++++ b/src/internal/safefilepath/path_other.go
> +@@ -0,0 +1,23 @@
> ++// Copyright 2022 The Go Authors. All rights reserved.
> ++// Use of this source code is governed by a BSD-style
> ++// license that can be found in the LICENSE file.
> ++
> ++//go:build !windows
> ++
> ++package safefilepath
> ++
> ++import "runtime"
> ++
> ++func fromFS(path string) (string, error) {
> ++	if runtime.GOOS == "plan9" {
> ++		if len(path) > 0 && path[0] == '#' {
> ++			return path, errInvalidPath
> ++		}
> ++	}
> ++	for i := range path {
> ++		if path[i] == 0 {
> ++			return "", errInvalidPath
> ++		}
> ++	}
> ++	return path, nil
> ++}
> +diff --git a/src/internal/safefilepath/path_test.go b/src/internal/safefilepath/path_test.go
> +new file mode 100644
> +index 0000000..dc662c1
> +--- /dev/null
> ++++ b/src/internal/safefilepath/path_test.go
> +@@ -0,0 +1,88 @@
> ++// Copyright 2022 The Go Authors. All rights reserved.
> ++// Use of this source code is governed by a BSD-style
> ++// license that can be found in the LICENSE file.
> ++
> ++package safefilepath_test
> ++
> ++import (
> ++	"internal/safefilepath"
> ++	"os"
> ++	"path/filepath"
> ++	"runtime"
> ++	"testing"
> ++)
> ++
> ++type PathTest struct {
> ++	path, result string
> ++}
> ++
> ++const invalid = ""
> ++
> ++var fspathtests = []PathTest{
> ++	{".", "."},
> ++	{"/a/b/c", "/a/b/c"},
> ++	{"a\x00b", invalid},
> ++}
> ++
> ++var winreservedpathtests = []PathTest{
> ++	{`a\b`, `a\b`},
> ++	{`a:b`, `a:b`},
> ++	{`a/b:c`, `a/b:c`},
> ++	{`NUL`, `NUL`},
> ++	{`./com1`, `./com1`},
> ++	{`a/nul/b`, `a/nul/b`},
> ++}
> ++
> ++// Whether a reserved name with an extension is reserved or not varies by
> ++// Windows version.
> ++var winreservedextpathtests = []PathTest{
> ++	{"nul.txt", "nul.txt"},
> ++	{"a/nul.txt/b", "a/nul.txt/b"},
> ++}
> ++
> ++var plan9reservedpathtests = []PathTest{
> ++	{`#c`, `#c`},
> ++}
> ++
> ++func TestFromFS(t *testing.T) {
> ++	switch runtime.GOOS {
> ++	case "windows":
> ++		if canWriteFile(t, "NUL") {
> ++			t.Errorf("can unexpectedly write a file named NUL on Windows")
> ++		}
> ++		if canWriteFile(t, "nul.txt") {
> ++			fspathtests = append(fspathtests, winreservedextpathtests...)
> ++		} else {
> ++			winreservedpathtests = append(winreservedpathtests, winreservedextpathtests...)
> ++		}
> ++		for i := range winreservedpathtests {
> ++			winreservedpathtests[i].result = invalid
> ++		}
> ++		for i := range fspathtests {
> ++			fspathtests[i].result = filepath.FromSlash(fspathtests[i].result)
> ++		}
> ++	case "plan9":
> ++		for i := range plan9reservedpathtests {
> ++			plan9reservedpathtests[i].result = invalid
> ++		}
> ++	}
> ++	tests := fspathtests
> ++	tests = append(tests, winreservedpathtests...)
> ++	tests = append(tests, plan9reservedpathtests...)
> ++	for _, test := range tests {
> ++		got, err := safefilepath.FromFS(test.path)
> ++		if (got == "") != (err != nil) {
> ++			t.Errorf(`FromFS(%q) = %q, %v; want "" only if err != nil`, test.path, got, err)
> ++		}
> ++		if got != test.result {
> ++			t.Errorf("FromFS(%q) = %q, %v; want %q", test.path, got, err, test.result)
> ++		}
> ++	}
> ++}
> ++
> ++func canWriteFile(t *testing.T, name string) bool {
> ++	path := filepath.Join(t.TempDir(), name)
> ++	os.WriteFile(path, []byte("ok"), 0666)
> ++	b, _ := os.ReadFile(path)
> ++	return string(b) == "ok"
> ++}
> +diff --git a/src/internal/safefilepath/path_windows.go b/src/internal/safefilepath/path_windows.go
> +new file mode 100644
> +index 0000000..909c150
> +--- /dev/null
> ++++ b/src/internal/safefilepath/path_windows.go
> +@@ -0,0 +1,95 @@
> ++// Copyright 2022 The Go Authors. All rights reserved.
> ++// Use of this source code is governed by a BSD-style
> ++// license that can be found in the LICENSE file.
> ++
> ++package safefilepath
> ++
> ++import (
> ++	"syscall"
> ++	"unicode/utf8"
> ++)
> ++
> ++func fromFS(path string) (string, error) {
> ++	if !utf8.ValidString(path) {
> ++		return "", errInvalidPath
> ++	}
> ++	for len(path) > 1 && path[0] == '/' && path[1] == '/' {
> ++		path = path[1:]
> ++	}
> ++	containsSlash := false
> ++	for p := path; p != ""; {
> ++		// Find the next path element.
> ++		i := 0
> ++		dot := -1
> ++		for i < len(p) && p[i] != '/' {
> ++			switch p[i] {
> ++			case 0, '\\', ':':
> ++				return "", errInvalidPath
> ++			case '.':
> ++				if dot < 0 {
> ++					dot = i
> ++				}
> ++			}
> ++			i++
> ++		}
> ++		part := p[:i]
> ++		if i < len(p) {
> ++			containsSlash = true
> ++			p = p[i+1:]
> ++		} else {
> ++			p = ""
> ++		}
> ++		// Trim the extension and look for a reserved name.
> ++		base := part
> ++		if dot >= 0 {
> ++			base = part[:dot]
> ++		}
> ++		if isReservedName(base) {
> ++			if dot < 0 {
> ++				return "", errInvalidPath
> ++			}
> ++			// The path element is a reserved name with an extension.
> ++			// Some Windows versions consider this a reserved name,
> ++			// while others do not. Use FullPath to see if the name is
> ++			// reserved.
> ++			if p, _ := syscall.FullPath(part); len(p) >= 4 && p[:4] == `\\.\` {
> ++				return "", errInvalidPath
> ++			}
> ++		}
> ++	}
> ++	if containsSlash {
> ++		// We can't depend on strings, so substitute \ for / manually.
> ++		buf := []byte(path)
> ++		for i, b := range buf {
> ++			if b == '/' {
> ++				buf[i] = '\\'
> ++			}
> ++		}
> ++		path = string(buf)
> ++	}
> ++	return path, nil
> ++}
> ++
> ++// isReservedName reports if name is a Windows reserved device name.
> ++// It does not detect names with an extension, which are also reserved on some Windows versions.
> ++//
> ++// For details, search for PRN in
> ++//https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file.
> ++func isReservedName(name string) bool {
> ++	if 3 <= len(name) && len(name) <= 4 {
> ++		switch string([]byte{toUpper(name[0]), toUpper(name[1]), toUpper(name[2])}) {
> ++		case "CON", "PRN", "AUX", "NUL":
> ++			return len(name) == 3
> ++		case "COM", "LPT":
> ++			return len(name) == 4 && '1' <= name[3] && name[3] <= '9'
> ++		}
> ++	}
> ++	return false
> ++}
> ++
> ++func toUpper(c byte) byte {
> ++	if 'a' <= c && c <= 'z' {
> ++		return c - ('a' - 'A')
> ++	}
> ++	return c
> ++}
> +diff --git a/src/net/http/fs.go b/src/net/http/fs.go
> +index 57e731e..43ee4b5 100644
> +--- a/src/net/http/fs.go
> ++++ b/src/net/http/fs.go
> +@@ -9,6 +9,7 @@ package http
> + import (
> + 	"errors"
> + 	"fmt"
> ++	"internal/safefilepath"
> + 	"io"
> + 	"io/fs"
> + 	"mime" +@@ -69,14 +70,15 @@ func mapDirOpenError(originalErr error, name 
> string) error { + // Open implements FileSystem using os.Open, opening 
> files for reading rooted + // and relative to the directory d. + func 
> (d Dir) Open(name string) (File, error) { +- if filepath.Separator != 
> '/' && strings.ContainsRune(name, filepath.Separator) { +- return nil, 
> errors.New("http: invalid character in file path")
> ++	path, err := safefilepath.FromFS(path.Clean("/" + name))
> ++	if err != nil {
> ++		return nil, errors.New("http: invalid or unsafe file path")
> + 	}
> + 	dir := string(d)
> + 	if dir == "" {
> + 		dir = "."
> + 	}
> +-	fullName := filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name)))
> ++	fullName := filepath.Join(dir, path)
> + 	f, err := os.Open(fullName)
> + 	if err != nil {
> + 		return nil, mapDirOpenError(err, fullName)
> +diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
> +index b42ade1..941448a 100644
> +--- a/src/net/http/fs_test.go
> ++++ b/src/net/http/fs_test.go
> +@@ -648,6 +648,34 @@ func TestFileServerZeroByte(t *testing.T) {
> + 	}
> + }
> +
> ++func TestFileServerNamesEscape(t *testing.T) {
> ++	t.Run("h1", func(t *testing.T) {
> ++		testFileServerNamesEscape(t, h1Mode)
> ++	})
> ++	t.Run("h2", func(t *testing.T) {
> ++		testFileServerNamesEscape(t, h2Mode)
> ++	})
> ++}
> ++func testFileServerNamesEscape(t *testing.T, h2 bool) {
> ++	defer afterTest(t)
> ++	ts := newClientServerTest(t, h2, FileServer(Dir("testdata"))).ts
> ++	defer ts.Close()
> ++	for _, path := range []string{
> ++		"/../testdata/file",
> ++		"/NUL", // don't read from device files on Windows
> ++	} {
> ++		res, err := ts.Client().Get(ts.URL + path)
> ++		if err != nil {
> ++			t.Fatal(err)
> ++		}
> ++		res.Body.Close()
> ++		if res.StatusCode < 400 || res.StatusCode > 599 {
> ++			t.Errorf("Get(%q): got status %v, want 4xx or 5xx", path, res.StatusCode)
> ++		}
> ++
> ++	}
> ++}
> ++
> + type fakeFileInfo struct {
> + 	dir      bool
> + 	basename string
> +diff --git a/src/os/file.go b/src/os/file.go
> +index e717f17..cb87158 100644
> +--- a/src/os/file.go
> ++++ b/src/os/file.go
> +@@ -37,12 +37,12 @@
> + // Note: The maximum number of concurrent operations on a File may be limited by
> + // the OS or the system. The number should be high, but exceeding it may degrade
> + // performance or cause other issues.
> +-//
> + package os
> +
> + import (
> + 	"errors"
> + 	"internal/poll"
> ++	"internal/safefilepath"
> + 	"internal/testlog"
> + 	"internal/unsafeheader"
> + 	"io" +@@ -623,6 +623,8 @@ func isWindowsNulName(name string) bool { + // 
> the /prefix tree, then using DirFS does not stop the access any more 
> than using + // os.Open does. DirFS is therefore not a general 
> substitute for a chroot-style security + // mechanism when the 
> directory tree contains arbitrary content. ++// ++// The directory dir 
> must not be "".
> + func DirFS(dir string) fs.FS {
> + 	return dirFS(dir)
> + }
> +@@ -641,10 +643,11 @@ func containsAny(s, chars string) bool {
> + type dirFS string
> +
> + func (dir dirFS) Open(name string) (fs.File, error) {
> +-	if !fs.ValidPath(name) || runtime.GOOS == "windows" && containsAny(name, `\:`) {
> +-		return nil, &PathError{Op: "open", Path: name, Err: ErrInvalid}
> ++	fullname, err := dir.join(name)
> ++	if err != nil {
> ++		return nil, &PathError{Op: "stat", Path: name, Err: err}
> + 	}
> +-	f, err := Open(string(dir) + "/" + name)
> ++	f, err := Open(fullname)
> + 	if err != nil {
> + 		return nil, err // nil fs.File
> + 	}
> +@@ -652,16 +655,35 @@ func (dir dirFS) Open(name string) (fs.File, error) {
> + }
> +
> + func (dir dirFS) Stat(name string) (fs.FileInfo, error) {
> +-	if !fs.ValidPath(name) || runtime.GOOS == "windows" && containsAny(name, `\:`) {
> +-		return nil, &PathError{Op: "stat", Path: name, Err: ErrInvalid}
> ++	fullname, err := dir.join(name)
> ++	if err != nil {
> ++		return nil, &PathError{Op: "stat", Path: name, Err: err}
> + 	}
> +-	f, err := Stat(string(dir) + "/" + name)
> ++	f, err := Stat(fullname)
> + 	if err != nil {
> + 		return nil, err
> + 	}
> + 	return f, nil
> + }
> +
> ++// join returns the path for name in dir.
> ++func (dir dirFS) join(name string) (string, error) {
> ++	if dir == "" {
> ++		return "", errors.New("os: DirFS with empty root")
> ++	}
> ++	if !fs.ValidPath(name) {
> ++		return "", ErrInvalid
> ++	}
> ++	name, err := safefilepath.FromFS(name)
> ++	if err != nil {
> ++		return "", ErrInvalid
> ++	}
> ++	if IsPathSeparator(dir[len(dir)-1]) {
> ++		return string(dir) + name, nil
> ++	}
> ++	return string(dir) + string(PathSeparator) + name, nil
> ++}
> ++
> + // ReadFile reads the named file and returns the contents.
> + // A successful call returns err == nil, not err == EOF.
> + // Because ReadFile reads the whole file, it does not treat an EOF from Read
> +diff --git a/src/os/os_test.go b/src/os/os_test.go
> +index 506f1fb..be269bb 100644
> +--- a/src/os/os_test.go
> ++++ b/src/os/os_test.go
> +@@ -2702,6 +2702,44 @@ func TestDirFS(t *testing.T) {
> + 	if err == nil {
> + 		t.Fatalf(`Open testdata\dirfs succeeded`)
> + 	}
> ++
> ++	// Test that Open does not open Windows device files.
> ++	_, err = d.Open(`NUL`)
> ++	if err == nil {
> ++		t.Errorf(`Open NUL succeeded`)
> ++	}
> ++}
> ++
> ++func TestDirFSRootDir(t *testing.T) {
> ++	cwd, err := os.Getwd()
> ++	if err != nil {
> ++		t.Fatal(err)
> ++	}
> ++	cwd = cwd[len(filepath.VolumeName(cwd)):] // trim volume prefix (C:) on Windows
> ++	cwd = filepath.ToSlash(cwd)               // convert \ to /
> ++	cwd = strings.TrimPrefix(cwd, "/")        // trim leading /
> ++
> ++	// Test that Open can open a path starting at /.
> ++	d := DirFS("/")
> ++	f, err := d.Open(cwd + "/testdata/dirfs/a")
> ++	if err != nil {
> ++		t.Fatal(err)
> ++	}
> ++	f.Close()
> ++}
> ++
> ++func TestDirFSEmptyDir(t *testing.T) {
> ++	d := DirFS("")
> ++	cwd, _ := os.Getwd()
> ++	for _, path := range []string{
> ++		"testdata/dirfs/a",                          // not DirFS(".")
> ++		filepath.ToSlash(cwd) + "/testdata/dirfs/a", // not DirFS("/")
> ++	} {
> ++		_, err := d.Open(path)
> ++		if err == nil {
> ++			t.Fatalf(`DirFS("").Open(%q) succeeded`, path)
> ++		}
> ++	}
> + }
> +
> + func TestDirFSPathsValid(t *testing.T) {
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#178840):https://lists.openembedded.org/g/openembedded-core/message/178840
> Mute This Topic:https://lists.openembedded.org/mt/97740601/3616765
> Group Owner:openembedded-core+owner@lists.openembedded.org
> Unsubscribe:https://lists.openembedded.org/g/openembedded-core/unsub  [randy.macleod@windriver.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>

On 2023-03-20 17:05, Randy MacLeod wrote:
> On 2023-03-20 16:09, Sakib Sajal via lists.openembedded.org wrote:
>> Backport appropriate patches to fix CVE-2022-2879 and CVE-2022-41720.
>>
>> Modified the original fix for CVE-2022-2879 to remove a testdata tarball
>> and any references to it since git binary diffs are not supported in quilt.
>>
>> Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
>> ---
>>   meta/recipes-devtools/go/go-1.17.13.inc       |  36 +-
>>   ...01-archive-tar-limit-size-of-headers.patch | 177 ++++++
>>   ...d-escapes-from-os.DirFS-and-http.Dir.patch | 514 ++++++++++++++++++
>>   3 files changed, 710 insertions(+), 17 deletions(-)
>>   create mode 100644 meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
>>   create mode 100644 meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
>>
>> diff --git a/meta/recipes-devtools/go/go-1.17.13.inc b/meta/recipes-devtools/go/go-1.17.13.inc
>> index 99662bd298..f5cf192361 100644
>> --- a/meta/recipes-devtools/go/go-1.17.13.inc
>> +++ b/meta/recipes-devtools/go/go-1.17.13.inc
>> @@ -4,23 +4,25 @@ FILESEXTRAPATHS:prepend := "${FILE_DIRNAME}/go-1.18:"
>>   
>>   LIC_FILES_CHKSUM ="file://LICENSE;md5=5d4950ecb7b26d2c5e4e7b4e0dd74707"
>>   
>> -SRC_URI += "\
>> -file://0001-allow-CC-and-CXX-to-have-multiple-words.patch  \
>> -file://0002-cmd-go-make-content-based-hash-generation-less-pedan.patch  \
>> -file://0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch  \
>> -file://0004-ld-add-soname-to-shareable-objects.patch  \
>> -file://0005-make.bash-override-CC-when-building-dist-and-go_boot.patch  \
>> -file://0006-cmd-dist-separate-host-and-target-builds.patch  \
>> -file://0007-cmd-go-make-GOROOT-precious-by-default.patch  \
>> -file://0008-use-GOBUILDMODE-to-set-buildmode.patch  \
>> -file://0009-Revert-cmd-go-make-sure-CC-and-CXX-are-absolute.patch  \
>> -file://0001-exec.go-do-not-write-linker-flags-into-buildids.patch  \
>> -file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch  \
>> -file://CVE-2022-27664.patch  \
>> -file://0001-net-http-httputil-avoid-query-parameter-smuggling.patch  \
>> -file://CVE-2022-41715.patch  \
>> -file://CVE-2022-41717.patch  \
>> -"
>> +SRC_URI = "https://golang.org/dl/go${PV}.src.tar.gz;name=main \
>
>
> Nack.
>
>
> Sakib,
>
> You said this works for you but if you look at:
>
> ❯ cat meta/recipes-devtools/go/go-1.17.13.inc
> require go-common.inc
>
> FILESEXTRAPATHS:prepend := "${FILE_DIRNAME}/go-1.18:"
>
> LIC_FILES_CHKSUM = "file://LICENSE;md5=5d4950ecb7b26d2c5e4e7b4e0dd74707"
>
> SRC_URI += "\
>  ...
>
> and then
>
> ❯ grep SRC_URI meta/recipes-devtools/go/go-common.inc
> SRC_URI = "https://golang.org/dl/go${PV}.src.tar.gz;name=main"
>
> You see that you should stick with the += operator.
>
> I think you said that devtool changed that , right?
>
> If so, and if we can learn why this change even built for you,
> then consider opening a bug against devtool.
>
> ../Randy
>
>
Yes, this change was done by "devtool update-recipe go"

I do not think what devtool did is wrong. go-common.inc is included only 
by go-1.17.13.inc and the SRC_URI from go-common.inc is included in the 
SRC_URI for go-1.17.13.inc, in the correct order too, so technically you 
do not need the += in go-1.17.13.inc file.

Regardless SRC_URI change should not be part of CVE fix, sending a v2 by 
updating the recipe manually.

Sakib


>> +file://0001-allow-CC-and-CXX-to-have-multiple-words.patch  \
>> +file://0002-cmd-go-make-content-based-hash-generation-less-pedan.patch  \
>> +file://0003-allow-GOTOOLDIR-to-be-overridden-in-the-environment.patch  \
>> +file://0004-ld-add-soname-to-shareable-objects.patch  \
>> +file://0005-make.bash-override-CC-when-building-dist-and-go_boot.patch  \
>> +file://0006-cmd-dist-separate-host-and-target-builds.patch  \
>> +file://0007-cmd-go-make-GOROOT-precious-by-default.patch  \
>> +file://0008-use-GOBUILDMODE-to-set-buildmode.patch  \
>> +file://0009-Revert-cmd-go-make-sure-CC-and-CXX-are-absolute.patch  \
>> +file://0001-exec.go-do-not-write-linker-flags-into-buildids.patch  \
>> +file://0001-src-cmd-dist-buildgo.go-do-not-hardcode-host-compile.patch  \
>> +file://CVE-2022-27664.patch  \
>> +file://0001-net-http-httputil-avoid-query-parameter-smuggling.patch  \
>> +file://CVE-2022-41715.patch  \
>> +file://CVE-2022-41717.patch  \
>> +file://0001-archive-tar-limit-size-of-headers.patch  \
>> +file://0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch  \
>> +           "
>>   SRC_URI[main.sha256sum] = "a1a48b23afb206f95e7bbaa9b898d965f90826f6f1d1fc0c1d784ada0cd300fd"
>>   
>>   # Upstream don't believe it is a signifiant real world issue and will only
>> diff --git a/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch b/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
>> new file mode 100644
>> index 0000000000..0315e1a3ee
>> --- /dev/null
>> +++ b/meta/recipes-devtools/go/go-1.18/0001-archive-tar-limit-size-of-headers.patch
>> @@ -0,0 +1,177 @@
>> +From d064ed520a7cc6b480f9565e30751e695d394f4e Mon Sep 17 00:00:00 2001
>> +From: Damien Neil<dneil@google.com>
>> +Date: Fri, 2 Sep 2022 20:45:18 -0700
>> +Subject: [PATCH] archive/tar: limit size of headers
>> +
>> +Set a 1MiB limit on special file blocks (PAX headers, GNU long names,
>> +GNU link names), to avoid reading arbitrarily large amounts of data
>> +into memory.
>> +
>> +Thanks to Adam Korczynski (ADA Logics) and OSS-Fuzz for reporting
>> +this issue.
>> +
>> +Fixes CVE-2022-2879
>> +Updates #54853
>> +Fixes #55925
>> +
>> +Change-Id: I85136d6ff1e0af101a112190e027987ab4335680
>> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1565555
>> +Reviewed-by: Tatiana Bradley<tatianabradley@google.com>
>> +Run-TryBot: Roland Shoemaker<bracewell@google.com>
>> +Reviewed-by: Roland Shoemaker<bracewell@google.com>
>> +(cherry picked from commit 6ee768cef6b82adf7a90dcf367a1699ef694f3b2)
>> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1590622
>> +Reviewed-by: Damien Neil<dneil@google.com>
>> +Reviewed-by: Julie Qiu<julieqiu@google.com>
>> +Reviewed-on:https://go-review.googlesource.com/c/go/+/438500
>> +Reviewed-by: Dmitri Shuralyov<dmitshur@golang.org>
>> +Reviewed-by: Carlos Amedee<carlos@golang.org>
>> +Reviewed-by: Dmitri Shuralyov<dmitshur@google.com>
>> +Run-TryBot: Carlos Amedee<carlos@golang.org>
>> +TryBot-Result: Gopher Robot<gobot@golang.org>
>> +
>> +CVE: CVE-2022-2879
>> +Upstream-Status: Backport [0a723816cd205576945fa57fbdde7e6532d59d08]
>> +Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
>> +---
>> + src/archive/tar/format.go      |  4 ++++
>> + src/archive/tar/reader.go      | 14 ++++++++++++--
>> + src/archive/tar/reader_test.go |  8 +++++++-
>> + src/archive/tar/writer.go      |  3 +++
>> + src/archive/tar/writer_test.go | 27 +++++++++++++++++++++++++++
>> + 5 files changed, 53 insertions(+), 3 deletions(-)
>> +
>> +diff --git a/src/archive/tar/format.go b/src/archive/tar/format.go
>> +index cfe24a5..6642364 100644
>> +--- a/src/archive/tar/format.go
>> ++++ b/src/archive/tar/format.go
>> +@@ -143,6 +143,10 @@ const (
>> + 	blockSize  = 512 // Size of each block in a tar stream
>> + 	nameSize   = 100 // Max length of the name field in USTAR format
>> + 	prefixSize = 155 // Max length of the prefix field in USTAR format
>> ++
>> ++	// Max length of a special file (PAX header, GNU long name or link).
>> ++	// This matches the limit used by libarchive.
>> ++	maxSpecialFileSize = 1 << 20
>> + )
>> +
>> + // blockPadding computes the number of bytes needed to pad offset up to the
>> +diff --git a/src/archive/tar/reader.go b/src/archive/tar/reader.go
>> +index 1b1d5b4..f645af8 100644
>> +--- a/src/archive/tar/reader.go
>> ++++ b/src/archive/tar/reader.go
>> +@@ -103,7 +103,7 @@ func (tr *Reader) next() (*Header, error) {
>> + 			continue // This is a meta header affecting the next header
>> + 		case TypeGNULongName, TypeGNULongLink:
>> + 			format.mayOnlyBe(FormatGNU)
>> +-			realname, err := io.ReadAll(tr)
>> ++			realname, err := readSpecialFile(tr)
>> + 			if err != nil {
>> + 				return nil, err
>> + 			}
>> +@@ -293,7 +293,7 @@ func mergePAX(hdr *Header, paxHdrs map[string]string) (err error) {
>> + // parsePAX parses PAX headers.
>> + // If an extended header (type 'x') is invalid, ErrHeader is returned
>> + func parsePAX(r io.Reader) (map[string]string, error) {
>> +-	buf, err := io.ReadAll(r)
>> ++	buf, err := readSpecialFile(r)
>> + 	if err != nil {
>> + 		return nil, err
>> + 	}
>> +@@ -826,6 +826,16 @@ func tryReadFull(r io.Reader, b []byte) (n int, err error) {
>> + 	return n, err
>> + }
>> +
>> ++// readSpecialFile is like io.ReadAll except it returns
>> ++// ErrFieldTooLong if more than maxSpecialFileSize is read.
>> ++func readSpecialFile(r io.Reader) ([]byte, error) {
>> ++	buf, err := io.ReadAll(io.LimitReader(r, maxSpecialFileSize+1))
>> ++	if len(buf) > maxSpecialFileSize {
>> ++		return nil, ErrFieldTooLong
>> ++	}
>> ++	return buf, err
>> ++}
>> ++
>> + // discard skips n bytes in r, reporting an error if unable to do so.
>> + func discard(r io.Reader, n int64) error {
>> + 	// If possible, Seek to the last byte before the end of the data section.
>> +diff --git a/src/archive/tar/reader_test.go b/src/archive/tar/reader_test.go
>> +index 789ddc1..926dc3d 100644
>> +--- a/src/archive/tar/reader_test.go
>> ++++ b/src/archive/tar/reader_test.go
>> +@@ -6,6 +6,7 @@ package tar
>> +
>> + import (
>> + 	"bytes"
>> ++	"compress/bzip2"
>> + 	"crypto/md5"
>> + 	"errors"
>> + 	"fmt" +@@ -625,9 +626,14 @@ func TestReader(t *testing.T) { + } + defer 
>> f.Close() + ++ var fr io.Reader = f ++ if strings.HasSuffix(v.file, ".bz2") {
>> ++				fr = bzip2.NewReader(fr)
>> ++			}
>> ++
>> + 			// Capture all headers and checksums.
>> + 			var (
>> +-				tr      = NewReader(f)
>> ++				tr      = NewReader(fr)
>> + 				hdrs    []*Header
>> + 				chksums []string
>> + 				rdbuf   = make([]byte, 8)
>> +diff --git a/src/archive/tar/writer.go b/src/archive/tar/writer.go
>> +index e80498d..893eac0 100644
>> +--- a/src/archive/tar/writer.go
>> ++++ b/src/archive/tar/writer.go
>> +@@ -199,6 +199,9 @@ func (tw *Writer) writePAXHeader(hdr *Header, paxHdrs map[string]string) error {
>> + 			flag = TypeXHeader
>> + 		}
>> + 		data := buf.String()
>> ++		if len(data) > maxSpecialFileSize {
>> ++			return ErrFieldTooLong
>> ++		}
>> + 		if err := tw.writeRawFile(name, data, flag, FormatPAX); err != nil || isGlobal {
>> + 			return err // Global headers return here
>> + 		}
>> +diff --git a/src/archive/tar/writer_test.go b/src/archive/tar/writer_test.go
>> +index a00f02d..4e709e5 100644
>> +--- a/src/archive/tar/writer_test.go
>> ++++ b/src/archive/tar/writer_test.go
>> +@@ -1006,6 +1006,33 @@ func TestIssue12594(t *testing.T) {
>> + 	}
>> + }
>> +
>> ++func TestWriteLongHeader(t *testing.T) {
>> ++	for _, test := range []struct {
>> ++		name string
>> ++		h    *Header
>> ++	}{{
>> ++		name: "name too long",
>> ++		h:    &Header{Name: strings.Repeat("a", maxSpecialFileSize)},
>> ++	}, {
>> ++		name: "linkname too long",
>> ++		h:    &Header{Linkname: strings.Repeat("a", maxSpecialFileSize)},
>> ++	}, {
>> ++		name: "uname too long",
>> ++		h:    &Header{Uname: strings.Repeat("a", maxSpecialFileSize)},
>> ++	}, {
>> ++		name: "gname too long",
>> ++		h:    &Header{Gname: strings.Repeat("a", maxSpecialFileSize)},
>> ++	}, {
>> ++		name: "PAX header too long",
>> ++		h:    &Header{PAXRecords: map[string]string{"GOLANG.x": strings.Repeat("a", maxSpecialFileSize)}},
>> ++	}} {
>> ++		w := NewWriter(io.Discard)
>> ++		if err := w.WriteHeader(test.h); err != ErrFieldTooLong {
>> ++			t.Errorf("%v: w.WriteHeader() = %v, want ErrFieldTooLong", test.name, err)
>> ++		}
>> ++	}
>> ++}
>> ++
>> + // testNonEmptyWriter wraps an io.Writer and ensures that
>> + // Write is never called with an empty buffer.
>> + type testNonEmptyWriter struct{ io.Writer }
>> diff --git a/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch b/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
>> new file mode 100644
>> index 0000000000..6c2e8804b3
>> --- /dev/null
>> +++ b/meta/recipes-devtools/go/go-1.18/0002-os-net-http-avoid-escapes-from-os.DirFS-and-http.Dir.patch
>> @@ -0,0 +1,514 @@
>> +From f8896a97a0630b0f2f8c488310147f7f20b3ec7d Mon Sep 17 00:00:00 2001
>> +From: Damien Neil<dneil@google.com>
>> +Date: Thu, 10 Nov 2022 12:16:27 -0800
>> +Subject: [PATCH] os, net/http: avoid escapes from os.DirFS and http.Dir on
>> + Windows
>> +
>> +Do not permit access to Windows reserved device names (NUL, COM1, etc.)
>> +via os.DirFS and http.Dir filesystems.
>> +
>> +Avoid escapes from os.DirFS(`\`) on Windows. DirFS would join the
>> +the root to the relative path with a path separator, making
>> +os.DirFS(`\`).Open(`/foo/bar`) open the path `\\foo\bar`, which is
>> +a UNC name. Not only does this not open the intended file, but permits
>> +reference to any file on the system rather than only files on the
>> +current drive.
>> +
>> +Make os.DirFS("") invalid, with all file access failing. Previously,
>> +a root of "" was interpreted as "/", which is surprising and probably
>> +unintentional.
>> +
>> +Fixes CVE-2022-41720.
>> +Fixes #56694.
>> +
>> +Change-Id: I275b5fa391e6ad7404309ea98ccc97405942e0f0
>> +Reviewed-on:https://team-review.git.corp.google.com/c/golang/go-private/+/1663832
>> +Reviewed-by: Julie Qiu<julieqiu@google.com>
>> +Reviewed-by: Tatiana Bradley<tatianabradley@google.com>
>> +Reviewed-on:https://go-review.googlesource.com/c/go/+/455360
>> +Reviewed-by: Michael Pratt<mpratt@google.com>
>> +TryBot-Result: Gopher Robot<gobot@golang.org>
>> +Run-TryBot: Jenny Rakoczy<jenny@golang.org>
>> +
>> +CVE: CVE-2022-41720
>> +Upstream-Status: Backport [7013a4f5f816af62033ad63dd06b77c30d7a62a7]
>> +Signed-off-by: Sakib Sajal<sakib.sajal@windriver.com>
>> +---
>> + src/go/build/deps_test.go                 |  1 +
>> + src/internal/safefilepath/path.go         | 21 +++++
>> + src/internal/safefilepath/path_other.go   | 23 ++++++
>> + src/internal/safefilepath/path_test.go    | 88 +++++++++++++++++++++
>> + src/internal/safefilepath/path_windows.go | 95 +++++++++++++++++++++++
>> + src/net/http/fs.go                        |  8 +-
>> + src/net/http/fs_test.go                   | 28 +++++++
>> + src/os/file.go                            | 36 +++++++--
>> + src/os/os_test.go                         | 38 +++++++++
>> + 9 files changed, 328 insertions(+), 10 deletions(-)
>> + create mode 100644 src/internal/safefilepath/path.go
>> + create mode 100644 src/internal/safefilepath/path_other.go
>> + create mode 100644 src/internal/safefilepath/path_test.go
>> + create mode 100644 src/internal/safefilepath/path_windows.go
>> +
>> +diff --git a/src/go/build/deps_test.go b/src/go/build/deps_test.go
>> +index 45e2f25..dc3bb8c 100644
>> +--- a/src/go/build/deps_test.go
>> ++++ b/src/go/build/deps_test.go
>> +@@ -165,6 +165,7 @@ var depsRules = `
>> + 	io/fs
>> + 	< internal/testlog
>> + 	< internal/poll
>> ++	< internal/safefilepath
>> + 	< os
>> + 	< os/signal;
>> +
>> +diff --git a/src/internal/safefilepath/path.go b/src/internal/safefilepath/path.go
>> +new file mode 100644
>> +index 0000000..0f0a270
>> +--- /dev/null
>> ++++ b/src/internal/safefilepath/path.go
>> +@@ -0,0 +1,21 @@
>> ++// Copyright 2022 The Go Authors. All rights reserved.
>> ++// Use of this source code is governed by a BSD-style
>> ++// license that can be found in the LICENSE file.
>> ++
>> ++// Package safefilepath manipulates operating-system file paths.
>> ++package safefilepath
>> ++
>> ++import (
>> ++	"errors"
>> ++)
>> ++
>> ++var errInvalidPath = errors.New("invalid path")
>> ++
>> ++// FromFS converts a slash-separated path into an operating-system path.
>> ++//
>> ++// FromFS returns an error if the path cannot be represented by the operating
>> ++// system. For example, paths containing '\' and ':' characters are rejected
>> ++// on Windows.
>> ++func FromFS(path string) (string, error) {
>> ++	return fromFS(path)
>> ++}
>> +diff --git a/src/internal/safefilepath/path_other.go b/src/internal/safefilepath/path_other.go
>> +new file mode 100644
>> +index 0000000..f93da18
>> +--- /dev/null
>> ++++ b/src/internal/safefilepath/path_other.go
>> +@@ -0,0 +1,23 @@
>> ++// Copyright 2022 The Go Authors. All rights reserved.
>> ++// Use of this source code is governed by a BSD-style
>> ++// license that can be found in the LICENSE file.
>> ++
>> ++//go:build !windows
>> ++
>> ++package safefilepath
>> ++
>> ++import "runtime"
>> ++
>> ++func fromFS(path string) (string, error) {
>> ++	if runtime.GOOS == "plan9" {
>> ++		if len(path) > 0 && path[0] == '#' {
>> ++			return path, errInvalidPath
>> ++		}
>> ++	}
>> ++	for i := range path {
>> ++		if path[i] == 0 {
>> ++			return "", errInvalidPath
>> ++		}
>> ++	}
>> ++	return path, nil
>> ++}
>> +diff --git a/src/internal/safefilepath/path_test.go b/src/internal/safefilepath/path_test.go
>> +new file mode 100644
>> +index 0000000..dc662c1
>> +--- /dev/null
>> ++++ b/src/internal/safefilepath/path_test.go
>> +@@ -0,0 +1,88 @@
>> ++// Copyright 2022 The Go Authors. All rights reserved.
>> ++// Use of this source code is governed by a BSD-style
>> ++// license that can be found in the LICENSE file.
>> ++
>> ++package safefilepath_test
>> ++
>> ++import (
>> ++	"internal/safefilepath"
>> ++	"os"
>> ++	"path/filepath"
>> ++	"runtime"
>> ++	"testing"
>> ++)
>> ++
>> ++type PathTest struct {
>> ++	path, result string
>> ++}
>> ++
>> ++const invalid = ""
>> ++
>> ++var fspathtests = []PathTest{
>> ++	{".", "."},
>> ++	{"/a/b/c", "/a/b/c"},
>> ++	{"a\x00b", invalid},
>> ++}
>> ++
>> ++var winreservedpathtests = []PathTest{
>> ++	{`a\b`, `a\b`},
>> ++	{`a:b`, `a:b`},
>> ++	{`a/b:c`, `a/b:c`},
>> ++	{`NUL`, `NUL`},
>> ++	{`./com1`, `./com1`},
>> ++	{`a/nul/b`, `a/nul/b`},
>> ++}
>> ++
>> ++// Whether a reserved name with an extension is reserved or not varies by
>> ++// Windows version.
>> ++var winreservedextpathtests = []PathTest{
>> ++	{"nul.txt", "nul.txt"},
>> ++	{"a/nul.txt/b", "a/nul.txt/b"},
>> ++}
>> ++
>> ++var plan9reservedpathtests = []PathTest{
>> ++	{`#c`, `#c`},
>> ++}
>> ++
>> ++func TestFromFS(t *testing.T) {
>> ++	switch runtime.GOOS {
>> ++	case "windows":
>> ++		if canWriteFile(t, "NUL") {
>> ++			t.Errorf("can unexpectedly write a file named NUL on Windows")
>> ++		}
>> ++		if canWriteFile(t, "nul.txt") {
>> ++			fspathtests = append(fspathtests, winreservedextpathtests...)
>> ++		} else {
>> ++			winreservedpathtests = append(winreservedpathtests, winreservedextpathtests...)
>> ++		}
>> ++		for i := range winreservedpathtests {
>> ++			winreservedpathtests[i].result = invalid
>> ++		}
>> ++		for i := range fspathtests {
>> ++			fspathtests[i].result = filepath.FromSlash(fspathtests[i].result)
>> ++		}
>> ++	case "plan9":
>> ++		for i := range plan9reservedpathtests {
>> ++			plan9reservedpathtests[i].result = invalid
>> ++		}
>> ++	}
>> ++	tests := fspathtests
>> ++	tests = append(tests, winreservedpathtests...)
>> ++	tests = append(tests, plan9reservedpathtests...)
>> ++	for _, test := range tests {
>> ++		got, err := safefilepath.FromFS(test.path)
>> ++		if (got == "") != (err != nil) {
>> ++			t.Errorf(`FromFS(%q) = %q, %v; want "" only if err != nil`, test.path, got, err)
>> ++		}
>> ++		if got != test.result {
>> ++			t.Errorf("FromFS(%q) = %q, %v; want %q", test.path, got, err, test.result)
>> ++		}
>> ++	}
>> ++}
>> ++
>> ++func canWriteFile(t *testing.T, name string) bool {
>> ++	path := filepath.Join(t.TempDir(), name)
>> ++	os.WriteFile(path, []byte("ok"), 0666)
>> ++	b, _ := os.ReadFile(path)
>> ++	return string(b) == "ok"
>> ++}
>> +diff --git a/src/internal/safefilepath/path_windows.go b/src/internal/safefilepath/path_windows.go
>> +new file mode 100644
>> +index 0000000..909c150
>> +--- /dev/null
>> ++++ b/src/internal/safefilepath/path_windows.go
>> +@@ -0,0 +1,95 @@
>> ++// Copyright 2022 The Go Authors. All rights reserved.
>> ++// Use of this source code is governed by a BSD-style
>> ++// license that can be found in the LICENSE file.
>> ++
>> ++package safefilepath
>> ++
>> ++import (
>> ++	"syscall"
>> ++	"unicode/utf8"
>> ++)
>> ++
>> ++func fromFS(path string) (string, error) {
>> ++	if !utf8.ValidString(path) {
>> ++		return "", errInvalidPath
>> ++	}
>> ++	for len(path) > 1 && path[0] == '/' && path[1] == '/' {
>> ++		path = path[1:]
>> ++	}
>> ++	containsSlash := false
>> ++	for p := path; p != ""; {
>> ++		// Find the next path element.
>> ++		i := 0
>> ++		dot := -1
>> ++		for i < len(p) && p[i] != '/' {
>> ++			switch p[i] {
>> ++			case 0, '\\', ':':
>> ++				return "", errInvalidPath
>> ++			case '.':
>> ++				if dot < 0 {
>> ++					dot = i
>> ++				}
>> ++			}
>> ++			i++
>> ++		}
>> ++		part := p[:i]
>> ++		if i < len(p) {
>> ++			containsSlash = true
>> ++			p = p[i+1:]
>> ++		} else {
>> ++			p = ""
>> ++		}
>> ++		// Trim the extension and look for a reserved name.
>> ++		base := part
>> ++		if dot >= 0 {
>> ++			base = part[:dot]
>> ++		}
>> ++		if isReservedName(base) {
>> ++			if dot < 0 {
>> ++				return "", errInvalidPath
>> ++			}
>> ++			// The path element is a reserved name with an extension.
>> ++			// Some Windows versions consider this a reserved name,
>> ++			// while others do not. Use FullPath to see if the name is
>> ++			// reserved.
>> ++			if p, _ := syscall.FullPath(part); len(p) >= 4 && p[:4] == `\\.\` {
>> ++				return "", errInvalidPath
>> ++			}
>> ++		}
>> ++	}
>> ++	if containsSlash {
>> ++		// We can't depend on strings, so substitute \ for / manually.
>> ++		buf := []byte(path)
>> ++		for i, b := range buf {
>> ++			if b == '/' {
>> ++				buf[i] = '\\'
>> ++			}
>> ++		}
>> ++		path = string(buf)
>> ++	}
>> ++	return path, nil
>> ++}
>> ++
>> ++// isReservedName reports if name is a Windows reserved device name.
>> ++// It does not detect names with an extension, which are also reserved on some Windows versions.
>> ++//
>> ++// For details, search for PRN in
>> ++//https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file.
>> ++func isReservedName(name string) bool {
>> ++	if 3 <= len(name) && len(name) <= 4 {
>> ++		switch string([]byte{toUpper(name[0]), toUpper(name[1]), toUpper(name[2])}) {
>> ++		case "CON", "PRN", "AUX", "NUL":
>> ++			return len(name) == 3
>> ++		case "COM", "LPT":
>> ++			return len(name) == 4 && '1' <= name[3] && name[3] <= '9'
>> ++		}
>> ++	}
>> ++	return false
>> ++}
>> ++
>> ++func toUpper(c byte) byte {
>> ++	if 'a' <= c && c <= 'z' {
>> ++		return c - ('a' - 'A')
>> ++	}
>> ++	return c
>> ++}
>> +diff --git a/src/net/http/fs.go b/src/net/http/fs.go
>> +index 57e731e..43ee4b5 100644
>> +--- a/src/net/http/fs.go
>> ++++ b/src/net/http/fs.go
>> +@@ -9,6 +9,7 @@ package http
>> + import (
>> + 	"errors"
>> + 	"fmt"
>> ++	"internal/safefilepath"
>> + 	"io"
>> + 	"io/fs"
>> + 	"mime" +@@ -69,14 +70,15 @@ func mapDirOpenError(originalErr error, name 
>> string) error { + // Open implements FileSystem using os.Open, 
>> opening files for reading rooted + // and relative to the directory 
>> d. + func (d Dir) Open(name string) (File, error) { +- if 
>> filepath.Separator != '/' && strings.ContainsRune(name, 
>> filepath.Separator) { +- return nil, errors.New("http: invalid character in file path")
>> ++	path, err := safefilepath.FromFS(path.Clean("/" + name))
>> ++	if err != nil {
>> ++		return nil, errors.New("http: invalid or unsafe file path")
>> + 	}
>> + 	dir := string(d)
>> + 	if dir == "" {
>> + 		dir = "."
>> + 	}
>> +-	fullName := filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name)))
>> ++	fullName := filepath.Join(dir, path)
>> + 	f, err := os.Open(fullName)
>> + 	if err != nil {
>> + 		return nil, mapDirOpenError(err, fullName)
>> +diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
>> +index b42ade1..941448a 100644
>> +--- a/src/net/http/fs_test.go
>> ++++ b/src/net/http/fs_test.go
>> +@@ -648,6 +648,34 @@ func TestFileServerZeroByte(t *testing.T) {
>> + 	}
>> + }
>> +
>> ++func TestFileServerNamesEscape(t *testing.T) {
>> ++	t.Run("h1", func(t *testing.T) {
>> ++		testFileServerNamesEscape(t, h1Mode)
>> ++	})
>> ++	t.Run("h2", func(t *testing.T) {
>> ++		testFileServerNamesEscape(t, h2Mode)
>> ++	})
>> ++}
>> ++func testFileServerNamesEscape(t *testing.T, h2 bool) {
>> ++	defer afterTest(t)
>> ++	ts := newClientServerTest(t, h2, FileServer(Dir("testdata"))).ts
>> ++	defer ts.Close()
>> ++	for _, path := range []string{
>> ++		"/../testdata/file",
>> ++		"/NUL", // don't read from device files on Windows
>> ++	} {
>> ++		res, err := ts.Client().Get(ts.URL + path)
>> ++		if err != nil {
>> ++			t.Fatal(err)
>> ++		}
>> ++		res.Body.Close()
>> ++		if res.StatusCode < 400 || res.StatusCode > 599 {
>> ++			t.Errorf("Get(%q): got status %v, want 4xx or 5xx", path, res.StatusCode)
>> ++		}
>> ++
>> ++	}
>> ++}
>> ++
>> + type fakeFileInfo struct {
>> + 	dir      bool
>> + 	basename string
>> +diff --git a/src/os/file.go b/src/os/file.go
>> +index e717f17..cb87158 100644
>> +--- a/src/os/file.go
>> ++++ b/src/os/file.go
>> +@@ -37,12 +37,12 @@
>> + // Note: The maximum number of concurrent operations on a File may be limited by
>> + // the OS or the system. The number should be high, but exceeding it may degrade
>> + // performance or cause other issues.
>> +-//
>> + package os
>> +
>> + import (
>> + 	"errors"
>> + 	"internal/poll"
>> ++	"internal/safefilepath"
>> + 	"internal/testlog"
>> + 	"internal/unsafeheader"
>> + 	"io" +@@ -623,6 +623,8 @@ func isWindowsNulName(name string) bool { + // 
>> the /prefix tree, then using DirFS does not stop the access any more 
>> than using + // os.Open does. DirFS is therefore not a general 
>> substitute for a chroot-style security + // mechanism when the 
>> directory tree contains arbitrary content. ++// ++// The directory 
>> dir must not be "".
>> + func DirFS(dir string) fs.FS {
>> + 	return dirFS(dir)
>> + }
>> +@@ -641,10 +643,11 @@ func containsAny(s, chars string) bool {
>> + type dirFS string
>> +
>> + func (dir dirFS) Open(name string) (fs.File, error) {
>> +-	if !fs.ValidPath(name) || runtime.GOOS == "windows" && containsAny(name, `\:`) {
>> +-		return nil, &PathError{Op: "open", Path: name, Err: ErrInvalid}
>> ++	fullname, err := dir.join(name)
>> ++	if err != nil {
>> ++		return nil, &PathError{Op: "stat", Path: name, Err: err}
>> + 	}
>> +-	f, err := Open(string(dir) + "/" + name)
>> ++	f, err := Open(fullname)
>> + 	if err != nil {
>> + 		return nil, err // nil fs.File
>> + 	}
>> +@@ -652,16 +655,35 @@ func (dir dirFS) Open(name string) (fs.File, error) {
>> + }
>> +
>> + func (dir dirFS) Stat(name string) (fs.FileInfo, error) {
>> +-	if !fs.ValidPath(name) || runtime.GOOS == "windows" && containsAny(name, `\:`) {
>> +-		return nil, &PathError{Op: "stat", Path: name, Err: ErrInvalid}
>> ++	fullname, err := dir.join(name)
>> ++	if err != nil {
>> ++		return nil, &PathError{Op: "stat", Path: name, Err: err}
>> + 	}
>> +-	f, err := Stat(string(dir) + "/" + name)
>> ++	f, err := Stat(fullname)
>> + 	if err != nil {
>> + 		return nil, err
>> + 	}
>> + 	return f, nil
>> + }
>> +
>> ++// join returns the path for name in dir.
>> ++func (dir dirFS) join(name string) (string, error) {
>> ++	if dir == "" {
>> ++		return "", errors.New("os: DirFS with empty root")
>> ++	}
>> ++	if !fs.ValidPath(name) {
>> ++		return "", ErrInvalid
>> ++	}
>> ++	name, err := safefilepath.FromFS(name)
>> ++	if err != nil {
>> ++		return "", ErrInvalid
>> ++	}
>> ++	if IsPathSeparator(dir[len(dir)-1]) {
>> ++		return string(dir) + name, nil
>> ++	}
>> ++	return string(dir) + string(PathSeparator) + name, nil
>> ++}
>> ++
>> + // ReadFile reads the named file and returns the contents.
>> + // A successful call returns err == nil, not err == EOF.
>> + // Because ReadFile reads the whole file, it does not treat an EOF from Read
>> +diff --git a/src/os/os_test.go b/src/os/os_test.go
>> +index 506f1fb..be269bb 100644
>> +--- a/src/os/os_test.go
>> ++++ b/src/os/os_test.go
>> +@@ -2702,6 +2702,44 @@ func TestDirFS(t *testing.T) {
>> + 	if err == nil {
>> + 		t.Fatalf(`Open testdata\dirfs succeeded`)
>> + 	}
>> ++
>> ++	// Test that Open does not open Windows device files.
>> ++	_, err = d.Open(`NUL`)
>> ++	if err == nil {
>> ++		t.Errorf(`Open NUL succeeded`)
>> ++	}
>> ++}
>> ++
>> ++func TestDirFSRootDir(t *testing.T) {
>> ++	cwd, err := os.Getwd()
>> ++	if err != nil {
>> ++		t.Fatal(err)
>> ++	}
>> ++	cwd = cwd[len(filepath.VolumeName(cwd)):] // trim volume prefix (C:) on Windows
>> ++	cwd = filepath.ToSlash(cwd)               // convert \ to /
>> ++	cwd = strings.TrimPrefix(cwd, "/")        // trim leading /
>> ++
>> ++	// Test that Open can open a path starting at /.
>> ++	d := DirFS("/")
>> ++	f, err := d.Open(cwd + "/testdata/dirfs/a")
>> ++	if err != nil {
>> ++		t.Fatal(err)
>> ++	}
>> ++	f.Close()
>> ++}
>> ++
>> ++func TestDirFSEmptyDir(t *testing.T) {
>> ++	d := DirFS("")
>> ++	cwd, _ := os.Getwd()
>> ++	for _, path := range []string{
>> ++		"testdata/dirfs/a",                          // not DirFS(".")
>> ++		filepath.ToSlash(cwd) + "/testdata/dirfs/a", // not DirFS("/")
>> ++	} {
>> ++		_, err := d.Open(path)
>> ++		if err == nil {
>> ++			t.Fatalf(`DirFS("").Open(%q) succeeded`, path)
>> ++		}
>> ++	}
>> + }
>> +
>> + func TestDirFSPathsValid(t *testing.T) {
>>
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>
> -- 
> # Randy MacLeod
> # Wind River Linux