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1#!/bin/bash -eu
2# Copyright 2018 Google Inc.
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15#
16################################################################################
17
18pushd $SRC/Python-2.7.15/
19patch -p1 <<'EOF'
20Index: v2_7_unstable/Python/pymath.c
21===================================================================
22--- v2_7_unstable.orig/Python/pymath.c
23+++ v2_7_unstable/Python/pymath.c
24@@ -18,6 +18,7 @@ double _Py_force_double(double x)
25 /* inline assembly for getting and setting the 387 FPU control word on
26    gcc/x86 */
27
28+__attribute__((no_sanitize_memory))
29 unsigned short _Py_get_387controlword(void) {
30     unsigned short cw;
31     __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
32Index: v2_7_unstable/Modules/_ctypes/callproc.c
33===================================================================
34--- v2_7_unstable.orig/Modules/_ctypes/callproc.c
35+++ v2_7_unstable/Modules/_ctypes/callproc.c
36@@ -1166,6 +1166,10 @@ PyObject *_ctypes_callproc(PPROC pProc,
37
38     rtype = _ctypes_get_ffi_type(restype);
39     resbuf = alloca(max(rtype->size, sizeof(ffi_arg)));
40+    /* ffi_call actually initializes resbuf, but from asm, which
41+     * MemorySanitizer can't detect. Avoid false positives from MSan. */
42+    if (resbuf != NULL)
43+        memset(resbuf, 0, max(rtype->size, sizeof(ffi_arg)));
44
45     avalues = (void **)alloca(sizeof(void *) * argcount);
46     atypes = (ffi_type **)alloca(sizeof(ffi_type *) * argcount);
47EOF
48
49if [ -e $OUT/sanpy/cflags -a "$(cat $OUT/sanpy/cflags)" = "${CFLAGS}" ] ; then
50    echo 'Python cflags unchanged, no need to rebuild'
51else
52    rm -rf $OUT/sanpy
53    ASAN_OPTIONS=detect_leaks=0 ./configure --without-pymalloc \
54                --prefix=$OUT/sanpy CFLAGS="${CFLAGS}" LINKCC="${CXX}" \
55                LDFLAGS="${CXXFLAGS}"
56    grep -v HAVE_GETC_UNLOCKED < pyconfig.h > tmp && mv tmp pyconfig.h
57    ASAN_OPTIONS=detect_leaks=0 make && make install
58    echo "${CFLAGS}" > $OUT/sanpy/cflags
59fi
60popd
61
62cd contrib/fuzz
63make clean oss-fuzz
64