1 files changed, 60 insertions, 0 deletions

diff --git a/meta-python/recipes-devtools/python/python3-pillow/0001-Restrict-builtins-for-ImageMath.eval.patch b/meta-python/recipes-devtools/python/python3-pillow/0001-Restrict-builtins-for-ImageMath.eval.patch
new file mode 100644
index 000000000..4c266cc41
--- /dev/null
+++ b/meta-python/recipes-devtools/python/python3-pillow/0001-Restrict-builtins-for-ImageMath.eval.patch
@@ -0,0 +1,60 @@
+From 8531b01d6cdf0b70f256f93092caa2a5d91afc11 Mon Sep 17 00:00:00 2001
+From: Andrew Murray <radarhere@users.noreply.github.com>
+Date: Sun, 2 Jan 2022 17:23:49 +1100
+Subject: [PATCH] Restrict builtins for ImageMath.eval
+
+CVE: CVE-2022-22817
+
+Upstream-Status: Backport
+(https://github.com/python-pillow/Pillow/pull/5923/commits/8531b01d6cdf0b70f256f93092caa2a5d91afc11)
+
+Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
+
+---
+ Tests/test_imagemath.py     | 7 +++++++
+ src/PIL/ImageMath.py        | 7 ++++++-
+ 2 files changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/Tests/test_imagemath.py b/Tests/test_imagemath.py
+index e7afd1ab..25811aa8 100644
+--- a/Tests/test_imagemath.py
++++ b/Tests/test_imagemath.py
+@@ -1,3 +1,5 @@
++import pytest
++
+ from PIL import Image, ImageMath
+ 
+ 
+@@ -50,6 +52,11 @@ def test_ops():
+     assert pixel(ImageMath.eval("float(B)**33", images)) == "F 8589934592.0"
+ 
+ 
++def test_prevent_exec():
++    with pytest.raises(ValueError):
++        ImageMath.eval("exec('pass')")
++
++
+ def test_logical():
+     assert pixel(ImageMath.eval("not A", images)) == 0
+     assert pixel(ImageMath.eval("A and B", images)) == "L 2"
+diff --git a/src/PIL/ImageMath.py b/src/PIL/ImageMath.py
+index 7f9c88e1..06bea800 100644
+--- a/src/PIL/ImageMath.py
++++ b/src/PIL/ImageMath.py
+@@ -246,7 +246,12 @@ def eval(expression, _dict={}, **kw):
+         if hasattr(v, "im"):
+             args[k] = _Operand(v)
+ 
+-    out = builtins.eval(expression, args)
++    code = compile(expression, "<string>", "eval")
++    for name in code.co_names:
++        if name not in args and name != "abs":
++            raise ValueError(f"'{name}' not allowed")
++
++    out = builtins.eval(expression, {"__builtins": {"abs": abs}}, args)
+     try:
+         return out.im
+     except AttributeError:
+-- 
+2.33.0
+