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new dfc5d176c9 fuzzer: improve documentation
dfc5d176c9 is described below
commit dfc5d176c9fd2ce5bf1b40603c8fe2f87f13d0a9
Author: Pierre-Anthony Lemieux <[email protected]>
AuthorDate: Mon Mar 9 22:33:20 2026 -0700
Commit: Pierre-Anthony Lemieux <[email protected]>
CommitDate: Sat Mar 14 21:36:58 2026 +0000
fuzzer: improve documentation
---
tools/target_dec_fuzzer.c | 23 +++++++++--------------
1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index 594f04f48b..dff354545a 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -20,22 +20,17 @@
compile-time flags.
INSTRUCTIONS:
- * Get the very fresh clang, e.g. see http://libfuzzer.info#versions
- * Get and build libFuzzer:
- svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
- ./Fuzzer/build.sh
- * build ffmpeg for fuzzing:
- FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g"
CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure --disable-x86asm
+ * Get clang > 6.0 (https://llvm.org/docs/LibFuzzer.html)
+ * Build ffmpeg for fuzzing:
+ ./configure --enable-debug --toolchain=clang-asan-ubsan-fuzz
--enable-ossfuzz
make clean && make -j
* build the fuzz target.
- Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
- choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
- clang -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp
tools/target_dec_fuzzer.c -o target_dec_fuzzer -I.
-DFFMPEG_CODEC=AV_CODEC_ID_MPEG1VIDEO -DFUZZ_FFMPEG_VIDEO
../../libfuzzer/libFuzzer.a -Llibavcodec -Llibavdevice -Llibavfilter
-Llibavformat -Llibavutil -Llibpostproc -Llibswscale -Llibswresample
-Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common
-Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil
-la [...]
- * create a corpus directory and put some samples there (empty dir is ok too):
- mkdir CORPUS && cp some-files CORPUS
-
- * Run fuzzing:
- ./target_dec_fuzzer -max_len=100000 CORPUS
+ make tools/target_dec_<codec>_fuzzer # e.g.
tools/target_dec_jpeg2000_fuzzer
+ * Run fuzzing with a corpus directory:
+ mkdir CORPUS && cp some-files CORPUS # (empty corpus dir is ok too)
+ ./tools/target_dec_<codec>_fuzzer -max_len=100000 CORPUS
+ * Run a test case:
+ ./tools/target_dec_<codec>_fuzzer <testcase>
More info:
http://libfuzzer.info
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