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211635b3 AB |
1 | #!/bin/sh -e |
2 | # | |
3 | # OSS-Fuzz build script. See: | |
4 | # https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh | |
5 | # | |
6 | # The file is consumed by: | |
7 | # https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles | |
8 | # | |
9 | # This code is licensed under the GPL version 2 or later. See | |
10 | # the COPYING file in the top-level directory. | |
11 | # | |
12 | ||
13 | # build project | |
14 | # e.g. | |
15 | # ./autogen.sh | |
16 | # ./configure | |
17 | # make -j$(nproc) all | |
18 | ||
19 | # build fuzzers | |
20 | # e.g. | |
21 | # $CXX $CXXFLAGS -std=c++11 -Iinclude \ | |
22 | # /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \ | |
23 | # $LIB_FUZZING_ENGINE /path/to/library.a | |
24 | ||
25 | fatal () { | |
26 | echo "Error : ${*}, exiting." | |
27 | exit 1 | |
28 | } | |
29 | ||
30 | OSS_FUZZ_BUILD_DIR="./build-oss-fuzz/" | |
31 | ||
32 | # There seems to be a bug in clang-11 (used for builds on oss-fuzz) : | |
33 | # accel/tcg/cputlb.o: In function `load_memop': | |
34 | # accel/tcg/cputlb.c:1505: undefined reference to `qemu_build_not_reached' | |
35 | # | |
36 | # When building with optimization, the compiler is expected to prove that the | |
37 | # statement cannot be reached, and remove it. For some reason clang-11 doesn't | |
38 | # remove it, resulting in an unresolved reference to qemu_build_not_reached | |
39 | # Undefine the __OPTIMIZE__ macro which compiler.h relies on to choose whether | |
40 | # to " #define qemu_build_not_reached() g_assert_not_reached() " | |
41 | EXTRA_CFLAGS="$CFLAGS -U __OPTIMIZE__" | |
42 | ||
43 | if ! { [ -e "./COPYING" ] && | |
44 | [ -e "./MAINTAINERS" ] && | |
45 | [ -e "./Makefile" ] && | |
46 | [ -e "./docs" ] && | |
47 | [ -e "./VERSION" ] && | |
48 | [ -e "./linux-user" ] && | |
49 | [ -e "./softmmu" ];} ; then | |
50 | fatal "Please run the script from the top of the QEMU tree" | |
51 | fi | |
52 | ||
53 | mkdir -p $OSS_FUZZ_BUILD_DIR || fatal "mkdir $OSS_FUZZ_BUILD_DIR failed" | |
54 | cd $OSS_FUZZ_BUILD_DIR || fatal "cd $OSS_FUZZ_BUILD_DIR failed" | |
55 | ||
56 | ||
57 | if [ -z ${LIB_FUZZING_ENGINE+x} ]; then | |
58 | LIB_FUZZING_ENGINE="-fsanitize=fuzzer" | |
59 | fi | |
60 | ||
61 | if [ -z ${OUT+x} ]; then | |
62 | DEST_DIR=$(realpath "./DEST_DIR") | |
63 | else | |
64 | DEST_DIR=$OUT | |
65 | fi | |
66 | ||
67 | mkdir -p "$DEST_DIR/lib/" # Copy the shared libraries here | |
68 | ||
69 | # Build once to get the list of dynamic lib paths, and copy them over | |
70 | ../configure --disable-werror --cc="$CC" --cxx="$CXX" \ | |
71 | --extra-cflags="$EXTRA_CFLAGS" | |
72 | ||
73 | if ! make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" \ | |
74 | i386-softmmu/fuzz; then | |
75 | fatal "Build failed. Please specify a compiler with fuzzing support"\ | |
76 | "using the \$CC and \$CXX environemnt variables, or specify a"\ | |
77 | "\$LIB_FUZZING_ENGINE compatible with your compiler"\ | |
78 | "\nFor example: CC=clang CXX=clang++ $0" | |
79 | fi | |
80 | ||
81 | for i in $(ldd ./i386-softmmu/qemu-fuzz-i386 | cut -f3 -d' '); do | |
82 | cp "$i" "$DEST_DIR/lib/" | |
83 | done | |
84 | rm ./i386-softmmu/qemu-fuzz-i386 | |
85 | ||
86 | # Build a second time to build the final binary with correct rpath | |
87 | ../configure --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" --disable-werror \ | |
88 | --cc="$CC" --cxx="$CXX" --extra-cflags="$EXTRA_CFLAGS" \ | |
89 | --extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'" | |
90 | make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" i386-softmmu/fuzz | |
91 | ||
92 | # Copy over the datadir | |
93 | cp -r ../pc-bios/ "$DEST_DIR/pc-bios" | |
94 | ||
95 | # Run the fuzzer with no arguments, to print the help-string and get the list | |
96 | # of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according | |
97 | # to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using | |
98 | # executable name) | |
99 | for target in $(./i386-softmmu/qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}'); | |
100 | do | |
101 | cp ./i386-softmmu/qemu-fuzz-i386 "$DEST_DIR/qemu-fuzz-i386-target-$target" | |
102 | done | |
103 | ||
104 | echo "Done. The fuzzers are located in $DEST_DIR" | |
105 | exit 0 |