blob: a07b3022e871e6b66ba0ed1080c42b5d026f3b82 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
#!/bin/sh -e
#
# OSS-Fuzz build script. See:
# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh
#
# The file is consumed by:
# https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles
#
# This code is licensed under the GPL version 2 or later. See
# the COPYING file in the top-level directory.
#
# build project
# e.g.
# ./autogen.sh
# ./configure
# make -j$(nproc) all
# build fuzzers
# e.g.
# $CXX $CXXFLAGS -std=c++11 -Iinclude \
# /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \
# $LIB_FUZZING_ENGINE /path/to/library.a
fatal () {
echo "Error : ${*}, exiting."
exit 1
}
OSS_FUZZ_BUILD_DIR="./build-oss-fuzz/"
# There seems to be a bug in clang-11 (used for builds on oss-fuzz) :
# accel/tcg/cputlb.o: In function `load_memop':
# accel/tcg/cputlb.c:1505: undefined reference to `qemu_build_not_reached'
#
# When building with optimization, the compiler is expected to prove that the
# statement cannot be reached, and remove it. For some reason clang-11 doesn't
# remove it, resulting in an unresolved reference to qemu_build_not_reached
# Undefine the __OPTIMIZE__ macro which compiler.h relies on to choose whether
# to " #define qemu_build_not_reached() g_assert_not_reached() "
EXTRA_CFLAGS="$CFLAGS -U __OPTIMIZE__"
if ! { [ -e "./COPYING" ] &&
[ -e "./MAINTAINERS" ] &&
[ -e "./Makefile" ] &&
[ -e "./docs" ] &&
[ -e "./VERSION" ] &&
[ -e "./linux-user" ] &&
[ -e "./softmmu" ];} ; then
fatal "Please run the script from the top of the QEMU tree"
fi
mkdir -p $OSS_FUZZ_BUILD_DIR || fatal "mkdir $OSS_FUZZ_BUILD_DIR failed"
cd $OSS_FUZZ_BUILD_DIR || fatal "cd $OSS_FUZZ_BUILD_DIR failed"
if [ -z ${LIB_FUZZING_ENGINE+x} ]; then
LIB_FUZZING_ENGINE="-fsanitize=fuzzer"
fi
if [ -z ${OUT+x} ]; then
DEST_DIR=$(realpath "./DEST_DIR")
else
DEST_DIR=$OUT
fi
mkdir -p "$DEST_DIR/lib/" # Copy the shared libraries here
# Build once to get the list of dynamic lib paths, and copy them over
../configure --disable-werror --cc="$CC" --cxx="$CXX" \
--extra-cflags="$EXTRA_CFLAGS" --target-list="i386-softmmu"
if ! make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" \
i386-softmmu/fuzz; then
fatal "Build failed. Please specify a compiler with fuzzing support"\
"using the \$CC and \$CXX environemnt variables, or specify a"\
"\$LIB_FUZZING_ENGINE compatible with your compiler"\
"\nFor example: CC=clang CXX=clang++ $0"
fi
for i in $(ldd ./i386-softmmu/qemu-fuzz-i386 | cut -f3 -d' '); do
cp "$i" "$DEST_DIR/lib/"
done
rm ./i386-softmmu/qemu-fuzz-i386
# Build a second time to build the final binary with correct rpath
../configure --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" --disable-werror \
--cc="$CC" --cxx="$CXX" --extra-cflags="$EXTRA_CFLAGS" \
--extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'"
make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" i386-softmmu/fuzz
# Copy over the datadir
cp -r ../pc-bios/ "$DEST_DIR/pc-bios"
# Run the fuzzer with no arguments, to print the help-string and get the list
# of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according
# to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using
# executable name)
for target in $(./i386-softmmu/qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}');
do
cp ./i386-softmmu/qemu-fuzz-i386 "$DEST_DIR/qemu-fuzz-i386-target-$target"
done
echo "Done. The fuzzers are located in $DEST_DIR"
exit 0
|
