python3: fix CVE-2019-20907

 - move fixing patch for CVE-2020-8492 to the right location

(From OE-Core rev: f7e7378ea7099af8555de809787cf8e2cb5208fd)

Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 45 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/files/0001-bpo-39503-CVE-2020-8492-Fix-AbstractBasicAuthHandler.patch b/meta/recipes-devtools/python/python3/0001-bpo-39503-CVE-2020-8492-Fix-AbstractBasicAuthHandler.patch
index e16b99bcb9..e16b99bcb9 100644
--- a/meta/recipes-devtools/python/files/0001-bpo-39503-CVE-2020-8492-Fix-AbstractBasicAuthHandler.patch
+++ b/meta/recipes-devtools/python/python3/0001-bpo-39503-CVE-2020-8492-Fix-AbstractBasicAuthHandler.patch
diff --git a/meta/recipes-devtools/python/python3/CVE-2019-20907.patch b/meta/recipes-devtools/python/python3/CVE-2019-20907.patch
new file mode 100644
index 0000000000..a2e72372dd
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/CVE-2019-20907.patch
@@ -0,0 +1,44 @@
+From a06a6bf4e67a50561f6d6fb33534df1d3035ea34 Mon Sep 17 00:00:00 2001
+From: Rishi <rishi_devan@mail.com>
+Date: Wed, 15 Jul 2020 13:51:00 +0200
+Subject: [PATCH] bpo-39017: Avoid infinite loop in the tarfile module
+ (GH-21454)
+
+Avoid infinite loop when reading specially crafted TAR files using the tarfile module
+(CVE-2019-20907).
+(cherry picked from commit 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4)
+
+Co-authored-by: Rishi <rishi_devan@mail.com>
+
+Removed testing 'recursion.tar' tar file due to binary data
+
+Upstream-Status: Backport [https://github.com/python/cpython/commit/c55479556db015f48fc8bbca17f64d3e65598559]
+CVE: CVE-2019-20907
+Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
+---
+ Lib/tarfile.py                                    |   2 ++
+ .../2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst      |   1 +
+ 4 files changed, 10 insertions(+)
+ create mode 100644 Lib/test/recursion.tar
+ create mode 100644 Misc/NEWS.d/next/Library/2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst
+
+diff --git a/Lib/tarfile.py b/Lib/tarfile.py
+index d31b9cbb51d65..7a69e1b1aa544 100755
+--- a/Lib/tarfile.py
++++ b/Lib/tarfile.py
+@@ -1241,6 +1241,8 @@ def _proc_pax(self, tarfile):
+ 
+             length, keyword = match.groups()
+             length = int(length)
++            if length == 0:
++                raise InvalidHeaderError("invalid header")
+             value = buf[match.end(2) + 1:match.start(1) + length - 1]
+ 
+             # Normally, we could just use "utf-8" as the encoding and "strict"
+diff --git a/Misc/NEWS.d/next/Library/2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst b/Misc/NEWS.d/next/Library/2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst
+new file mode 100644
+index 0000000000000..ad26676f8b856
+--- /dev/null
++++ b/Misc/NEWS.d/next/Library/2020-07-12-22-16-58.bpo-39017.x3Cg-9.rst
+@@ -0,0 +1 @@
++Avoid infinite loop when reading specially crafted TAR files using the tarfile module (CVE-2019-20907).
diff --git a/meta/recipes-devtools/python/python3_3.8.2.bb b/meta/recipes-devtools/python/python3_3.8.2.bb
index b4cce88e87..9eddad4ad4 100644
--- a/meta/recipes-devtools/python/python3_3.8.2.bb
+++ b/meta/recipes-devtools/python/python3_3.8.2.bb
@@ -33,6 +33,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
            file://0001-python3-Do-not-hardcode-lib-for-distutils.patch \
            file://0020-configure.ac-setup.py-do-not-add-a-curses-include-pa.patch \
            file://0001-bpo-39503-CVE-2020-8492-Fix-AbstractBasicAuthHandler.patch \
+           file://CVE-2019-20907.patch \
            file://CVE-2020-14422.patch \
            file://CVE-2020-26116.patch \
            file://CVE-2020-27619.patch \