go: Security Fix for CVE-2022-2879

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.

Link: https://github.com/golang/go/commit/0a723816cd2

(From OE-Core rev: a8e2f91edfe2df5204a482c4e53fbdd08f80e878)

Signed-off-by: Sunil Kumar <sukumar@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 112 insertions, 0 deletions

diff --git a/meta/recipes-devtools/go/go-1.14.inc b/meta/recipes-devtools/go/go-1.14.inc
index 3341beb159..e8ff1c4ec9 100644
--- a/meta/recipes-devtools/go/go-1.14.inc
+++ b/meta/recipes-devtools/go/go-1.14.inc
@@ -42,6 +42,7 @@ SRC_URI += "\
     file://0003-CVE-2022-32190.patch \
     file://0004-CVE-2022-32190.patch \
     file://CVE-2022-2880.patch \
+    file://CVE-2022-2879.patch \
 "
 
 SRC_URI_append_libc-musl = " file://0009-ld-replace-glibc-dynamic-linker-with-musl.patch"
diff --git a/meta/recipes-devtools/go/go-1.14/CVE-2022-2879.patch b/meta/recipes-devtools/go/go-1.14/CVE-2022-2879.patch
new file mode 100644
index 0000000000..ea04a82d16
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.14/CVE-2022-2879.patch
@@ -0,0 +1,111 @@
+From 9d339f1d0f53c4116a7cb4acfa895f31a07212ee 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 #55926
+
+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/+/1591053
+Reviewed-by: Julie Qiu <julieqiu@google.com>
+Reviewed-by: Damien Neil <dneil@google.com>
+Reviewed-on: https://go-review.googlesource.com/c/go/+/438498
+TryBot-Result: Gopher Robot <gobot@golang.org>
+Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
+Reviewed-by: Carlos Amedee <carlos@golang.org>
+Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
+Run-TryBot: Carlos Amedee <carlos@golang.org>
+
+Upstream-Status: Backport [https://github.com/golang/go/commit/0a723816cd2]
+CVE: CVE-2022-2879
+Signed-off-by: Sunil Kumar <sukumar@mvista.com>
+---
+ src/archive/tar/format.go |  4 ++++
+ src/archive/tar/reader.go | 14 ++++++++++++--
+ src/archive/tar/writer.go |  3 +++
+ 3 files changed, 19 insertions(+), 2 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 4f9135b..e996595 100644
+--- a/src/archive/tar/reader.go
++++ b/src/archive/tar/reader.go
+@@ -104,7 +104,7 @@ func (tr *Reader) next() (*Header, error) {
+                        continue // This is a meta header affecting the next header
+                case TypeGNULongName, TypeGNULongLink:
+                        format.mayOnlyBe(FormatGNU)
+-                       realname, err := ioutil.ReadAll(tr)
++                       realname, err := readSpecialFile(tr)
+                        if err != nil {
+                                return nil, err
+                        }
+@@ -294,7 +294,7 @@ 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 := ioutil.ReadAll(r)
++       buf, err := readSpecialFile(r)
+        if err != nil {
+                return nil, err
+        }
+@@ -827,6 +827,16 @@ func tryReadFull(r io.Reader, b []byte) (n int, err error) {
+        return n, err
+ }
+
++// readSpecialFile is like ioutil.ReadAll except it returns
++// ErrFieldTooLong if more than maxSpecialFileSize is read.
++func readSpecialFile(r io.Reader) ([]byte, error) {
++       buf, err := ioutil.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/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
+                }
+--
+2.7.4