cpython: Fix upstream bugs NixOS#27177 and NixOS#25750

27177 was merged but not backported to 2.7.
There is currently an open PR for 25750.

pkgs/development/interpreters/python/cpython/2.7/default.nix

@@ -60,6 +60,24 @@ let
 
       ./properly-detect-curses.patch
 
+      # Fix python bug #27177 (https://bugs.python.org/issue27177)
+      # The issue is that `match.group` only recognizes python integers
+      # instead of everything that has `__index__`.
+      # This bug was fixed upstream, but not backported to 2.7
+      (fetchpatch {
+        name = "re_match_index.patch";
+        url = "https://bugs.python.org/file43084/re_match_index.patch";
+        sha256 = "0l9rw6r5r90iybdkp3hhl2pf0h0s1izc68h5d3ywrm92pq32wz57";
+      })
+
+      # "`type_getattro()` calls `tp_descr_get(self, obj, type)` without actually owning a reference to "self".
+      # In very rare cases, this can cause a segmentation fault if "self" is deleted by the descriptor."
+      # https://github.com/python/cpython/pull/6118
+      (fetchpatch {
+        name = "type_getattro.patch";
+        url = "https://github.com/python/cpython/pull/6118/commits/8c6da2d7e7e719c40fb539b7f7cb7583cccc5527.patch";
+        sha256 = "11v9yx20hs3jmw0wggzvmw39qs4mxay4kb8iq2qjydwy9ya61nrd";
+      })
     ] ++ optionals (x11Support && stdenv.isDarwin) [
       ./use-correct-tcl-tk-on-darwin.patch
     ] ++ optionals stdenv.isLinux [