Introduce fuzzing for payjoin #1153

benalleng · 2025-10-07T19:27:36Z

This adds fuzzing infrastructure for payjoin with the inclusion
of three engine options, cargo-fuzz (libfuzzer-sys), afl++, and honggfuzz. These
two were chosen as they come with seperate tradeoffs in regards to speed
and error handling.

Because these two fuzzers are setup as mutually exclusive fuzzers within
the same target file fuzzing cannot reasonably be built with
--all-features.

In addition honggfuzz and afl are seemingly broken on nix so I don't think it is reasonably
possible at this time to nixify our fuzzing crate.

The readme for reading pleasure https://github.com/benalleng/rust-payjoin/blob/fuzzing/fuzz/README.md

NB The tests that I have written are not guaranteed as good fuzzing targets and that I my hope for the mob coding session on Wednesday 1/14 next week to shore up before this is merge-able

Pull Request Checklist

Please confirm the following before requesting review:

I have disclosed my use of
AI
in the body of this PR.
I have read CONTRIBUTING.md and rebased my branch to produce hygienic commits.

coveralls · 2025-10-07T19:31:36Z

Pull Request Test Coverage Report for Build 21079319823

Details

0 of 0 changed or added relevant lines in 0 files are covered.
No unchanged relevant lines lost coverage.
Overall coverage remained the same at 83.058%

Totals
Change from base Build 21044982881:	0.0%
Covered Lines:	9771
Relevant Lines:	11764

💛 - Coveralls

benalleng · 2025-11-24T17:20:58Z

Following the summit I thought it would be a good idea to try and follow the way that rust-lightning builds their fuzz infra https://github.com/lightningdevkit/rust-lightning/tree/main/fuzz with multiple fuzz suites, however I cannot get honggfuzz running on my machine for the life of me, maybe a personal nix problem but I also found this comment rust-fuzz/honggfuzz-rs#106 so I am not totally sure if there is a larger issue with hongfuzz at the moment.

benalleng · 2026-01-06T23:06:11Z

I excluded fuzzing from linting as the crate does not follow --all-features namely looking for a user to choose the fuzzing engine with a specific feature flag

benalleng · 2026-01-15T16:05:09Z

I have added these 2 pre-configurations to the fuzz shells as it seems easier for most people to simply skip these optimizations but if we want to have a more efficient we probably need to address these.

Your system is configured to send core dump notifications to an
    external utility. This will cause issues: there will be an extended delay
    between stumbling upon a crash and having this information relayed to the
    fuzzer via the standard waitpid() API.
    If you're just experimenting, set 'AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES=1'.

    To avoid having crashes misinterpreted as timeouts, please 
    temporarily modify /proc/sys/kernel/core_pattern, like so:

    echo core | sudo tee /proc/sys/kernel/core_pattern

and

Whoops, your system uses on-demand CPU frequency scaling, adjusted
    between 1075 and 5139 MHz. Unfortunately, the scaling algorithm in the
    kernel is imperfect and can miss the short-lived processes spawned by
    afl-fuzz. To keep things moving, run these commands as root:

    cd /sys/devices/system/cpu
    echo performance | sudo tee cpu*/cpufreq/scaling_governor

    You can later go back to the original state by replacing 'performance'
    with 'ondemand' or 'powersave'. If you don't want to change the settings,
    set AFL_SKIP_CPUFREQ to make afl-fuzz skip this check - but expect some
    performance drop.

[-] PROGRAM ABORT : Suboptimal CPU scaling governor
         Location : check_cpu_governor(), src/afl-fuzz-init.c:2753

Again I don't these are critical for CI fuzzing or just running the ./fuzz.sh script but I do believe that if we want say a long-running fuzzer these could result in significant performace holdups.

The docs are less helpful than I would hope https://afl-1.readthedocs.io/en/latest/user_guide.html#settings-for-afl-fuzz

If you are Jakub, you may need AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES. Others need not apply.

Edit: Maybe just a readme step telling users to follow those 2 steps as setup for afl is sufficient

nothingmuch

these changes partially fix:

cargo-honggfuzz package name
applying the overlay instead of only re-exporting it as an output of our flake
adding this package to the environment
crate & honggfuzz version mismatch

however, bash fuzz.sh hfuzz still fails to build, due to a C compilation error:

we should probably copy fedimint's homework here

error: failed to run custom build command for `honggfuzz v0.5.58`

Caused by:
  process didn't exit successfully: `/home/user/code/github.com/payjoin/rust-payjoin/fuzz/hfuzz_target/release/build/honggfuzz-a4afbd6c254bbc3c/build-script-build` (exit status: 101)
  --- stdout
  make: Entering directory '/home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/honggfuzz-0.5.58/honggfuzz'
  rm -f -r core Makefile.bak cmdline.o display.o fuzz.o honggfuzz.o input.o mangle.o report.o sanitizers.o socketfuzzer.o subproc.o linux/arch.o linux/bfd.o linux/perf.o linux/pt.o linux/trace.o linux/unwind.o honggfuzz hfuzz_cc/hfuzz-cc libhfuzz/libhfuzz.a libhfuzz/libhfuzz.so libhfuzz/fetch.o libhfuzz/instrument.o libhfuzz/linux.o libhfuzz/memorycmp.o libhfuzz/performance.o libhfuzz/persistent.o libhfcommon/libhfcommon.a libhfcommon/files.o libhfcommon/log.o libhfcommon/ns.o libhfcommon/util.o libhfnetdriver/libhfnetdriver.a libhfnetdriver/netdriver.o  obj libs ./*.o ./*~ ./core ./*.a ./*.dSYM ./*.la ./*.so ./*.dylib linux/*.o linux/*~ linux/core linux/*.a linux/*.dSYM linux/*.la linux/*.so linux/*.dylib mac/*.o mac/*~ mac/core mac/*.a mac/*.dSYM mac/*.la mac/*.so mac/*.dylib netbsd/*.o netbsd/*~ netbsd/core netbsd/*.a netbsd/*.dSYM netbsd/*.la netbsd/*.so netbsd/*.dylib posix/*.o posix/*~ posix/core posix/*.a posix/*.dSYM posix/*.la posix/*.so posix/*.dylib libhfuzz/*.o libhfuzz/*~ libhfuzz/core libhfuzz/*.a libhfuzz/*.dSYM libhfuzz/*.la libhfuzz/*.so libhfuzz/*.dylib libhfcommon/*.o libhfcommon/*~ libhfcommon/core libhfcommon/*.a libhfcommon/*.dSYM libhfcommon/*.la libhfcommon/*.so libhfcommon/*.dylib libhfnetdriver/*.o libhfnetdriver/*~ libhfnetdriver/core libhfnetdriver/*.a libhfnetdriver/*.dSYM libhfnetdriver/*.la libhfnetdriver/*.so libhfnetdriver/*.dylib
  make: Leaving directory '/home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/honggfuzz-0.5.58/honggfuzz'
  make: Entering directory '/home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/honggfuzz-0.5.58/honggfuzz'
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o cmdline.o cmdline.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o display.o display.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o fuzz.o fuzz.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o honggfuzz.o honggfuzz.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o input.o input.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o mangle.o mangle.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o report.o report.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o sanitizers.o sanitizers.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o socketfuzzer.o socketfuzzer.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o subproc.o subproc.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/arch.o linux/arch.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/bfd.o linux/bfd.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/perf.o linux/perf.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/pt.o linux/pt.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/trace.o linux/trace.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3  -o linux/unwind.o linux/unwind.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfcommon/files.o libhfcommon/files.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfcommon/log.o libhfcommon/log.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfcommon/ns.o libhfcommon/ns.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfcommon/util.o libhfcommon/util.c
  ar rcs libhfcommon/libhfcommon.a libhfcommon/files.o libhfcommon/log.o libhfcommon/ns.o libhfcommon/util.o
  gcc -o honggfuzz cmdline.o display.o fuzz.o honggfuzz.o input.o mangle.o report.o sanitizers.o socketfuzzer.o subproc.o linux/arch.o linux/bfd.o linux/perf.o linux/pt.o linux/trace.o linux/unwind.o libhfcommon/libhfcommon.a -pthread -L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib -lm -L/usr/local/include -lunwind-ptrace -lunwind-generic -lunwind  -llzma -lopcodes -lbfd -lrt -ldl -lm -latomic -g -ggdb -g3
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfuzz/fetch.o libhfuzz/fetch.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfuzz/instrument.o libhfuzz/instrument.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfuzz/linux.o libhfuzz/linux.c
  gcc -c -O3 -mtune=native -funroll-loops -std=c11 -I/usr/local/include -D_GNU_SOURCE -Wall -Wextra -Werror -Wno-format-truncation -Wno-override-init -I. -D_FILE_OFFSET_BITS=64 -finline-limit=4000 -D_HF_ARCH_LINUX -D_HF_ARCH_LINUX -g -ggdb -g3 -fPIC -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0   -o libhfuzz/memorycmp.o libhfuzz/memorycmp.c
  make: Leaving directory '/home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/honggfuzz-0.5.58/honggfuzz'

  --- stderr

... ellided someredundant warnings

  warning: Skipping impure flag -mtune=native because NIX_ENFORCE_NO_NATIVE is set
  In file included from /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/features.h:511,
                   from /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/ctype.h:25,
                   from libhfuzz/memorycmp.c:1:
  /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/string_fortified.h:77:1: error: 'strcpy' defined both normally and as 'alias' attribute
     77 | __NTH (strcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
        | ^~~~~
  /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/string_fortified.h:136:1: error: 'strcat' defined both normally and as 'alias' attribute
    136 | __NTH (strcat (__fortify_clang_overload_arg (char *, __restrict, __dest),
        | ^~~~~
  /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/string_fortified.h:161:1: error: 'strlcpy' defined both normally and as 'alias' attribute
    161 | __NTH (strlcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
        | ^~~~~
  /nix/store/gi4cz4ir3zlwhf1azqfgxqdnczfrwsr7-glibc-2.40-66-dev/include/bits/string_fortified.h:179:1: error: 'strlcat' defined both normally and as 'alias' attribute
    179 | __NTH (strlcat (__fortify_clang_overload_arg (char *, __restrict, __dest),
        | ^~~~~
  make: *** [Makefile:311: libhfuzz/memorycmp.o] Error 1

  thread 'main' (1564888) panicked at /home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/honggfuzz-0.5.58/build.rs:63:5:
  assertion failed: status.success()
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

fuzz/fuzz.sh

nix/overlays/cargo-honggfuzz.nix

flake.nix

nix/pkgs/cargo-honggfuzz.nix

spacebear21 · 2026-01-15T20:44:52Z

I should've asked this on yesterday's call but time ran out and I needed to hop off. Are there other areas of the codebase that you have in mind for fuzz testing candidates in follow-ups? PSBT and uri parsing are nice as an introduction for fuzzing but aren't directly payjoin related. Maybe the payjoin directory/service since it might accept arbitrary inputs from the Internet? It would be nice to document and track fuzz candidates in an issue.

This commit adds fuzzing infrastructure for payjoin with the inclusion of three engine options, cargo-fuzz (libfuzzer-sys), afl++, and honggfuzz. These two were chosen as they come with seperate tradeoffs in regards to speed and error handling. Because these two fuzzers are setup as mutually exclusive fuzzers within the same target file fuzzing cannot reasonably be built with `--all-features`. In addition honggfuzz and afl are seemingly broken on nix so I don't think it is reasonably possible at this time to nixify our fuzzing crate.

benalleng force-pushed the fuzzing branch from dbe7d8a to 8b2e141 Compare October 7, 2025 19:28

benalleng force-pushed the fuzzing branch from 7129464 to 3093e33 Compare November 20, 2025 19:14

benalleng force-pushed the fuzzing branch from 3093e33 to 3656cfe Compare January 6, 2026 17:51

benalleng changed the title ~~[WIP] Create POC for fuzzing payjoin~~ [WIP] Introduce fuzzing for payjoin Jan 6, 2026

benalleng force-pushed the fuzzing branch 10 times, most recently from cfcd3fe to 7cdc884 Compare January 7, 2026 20:44

benalleng changed the title ~~[WIP] Introduce fuzzing for payjoin~~ Introduce fuzzing for payjoin Jan 7, 2026

benalleng requested review from DanGould and spacebear21 January 7, 2026 20:46

benalleng marked this pull request as ready for review January 7, 2026 20:47

benalleng requested a review from nothingmuch January 7, 2026 20:48

benalleng force-pushed the fuzzing branch 5 times, most recently from f7f5b33 to 8655ffd Compare January 15, 2026 15:40

nothingmuch requested changes Jan 15, 2026

View reviewed changes

benalleng force-pushed the fuzzing branch from cb9b302 to 0a9b624 Compare January 15, 2026 18:16

benalleng mentioned this pull request Jan 16, 2026

Tracking fuzzing candidates #1267

Open

5 tasks

benalleng force-pushed the fuzzing branch 4 times, most recently from 00266e7 to f4cc3c1 Compare January 16, 2026 18:10

benalleng and others added 3 commits January 16, 2026 14:39

Add fuzzers to devshell

395d255

Unscrew clang

dab9cde

benalleng force-pushed the fuzzing branch from 2ab78a8 to be6ba33 Compare January 16, 2026 19:39

Use aflplusplus not cargo-afl

87ec279

benalleng force-pushed the fuzzing branch from be6ba33 to 87ec279 Compare January 16, 2026 20:05

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