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add non-x86_64 architecture libfuzzer target support using qemu-user (#600)

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bmc-msft
2021-03-03 19:06:50 -05:00
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parent 92c1d0a7a1
commit 7fc725d012
9 changed files with 493 additions and 5 deletions
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8
.github/workflows/ci.yml vendored
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@ -327,7 +327,7 @@ jobs:
name: release-artifacts name: release-artifacts
path: release-artifacts path: release-artifacts
build-integration-tests-linux: build-integration-tests-linux:
runs-on: ubuntu-latest runs-on: ubuntu-18.04
steps: steps:
- uses: actions/checkout@v2 - uses: actions/checkout@v2
- run: | - run: |
@ -363,6 +363,12 @@ jobs:
export AFL_CC_PATH=$PWD/AFL/afl-clang export AFL_CC_PATH=$PWD/AFL/afl-clang
(cd trivial-crash ; make clean; make CC=$AFL_CC_PATH) (cd trivial-crash ; make clean; make CC=$AFL_CC_PATH)
cp -r trivial-crash/fuzz.exe trivial-crash/seeds artifacts/linux-trivial-crash-afl cp -r trivial-crash/fuzz.exe trivial-crash/seeds artifacts/linux-trivial-crash-afl
# libfuzzer cross-compiled to aarch64
mkdir -p artifacts/linux-libfuzzer-aarch64-crosscompile
(cd libfuzzer-aarch64-crosscompile; make)
cp -r libfuzzer-aarch64-crosscompile/fuzz.exe libfuzzer-aarch64-crosscompile/inputs artifacts/linux-libfuzzer-aarch64-crosscompile
- uses: actions/upload-artifact@v2.2.2 - uses: actions/upload-artifact@v2.2.2
with: with:
name: integration-test-artifacts name: integration-test-artifacts

151
docs/how-to/fuzzing-other-architectures-on-azure.md Normal file
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@ -0,0 +1,151 @@
# Fuzzing non-X86_64 targets on Azure
Fuzzing non-x86_64 targets using libFuzzer on Azure makes use of two Open
Source capabilities:
2. [libFuzzer](https://www.llvm.org/docs/LibFuzzer.html), which performs the fuzzing
3. [qemu-user](https://qemu.readthedocs.io/en/latest/user/main.html), which provides user-space emulation.
TL/DR: check out our [libfuzzer-aarch64-crosscompile example](../../src/integration-tests/libfuzzer-aarch64-crosscompile/)
## Issues using qemu_user based LibFuzzer in OneFuzz
There are a few notable limitations when using `qemu-user` based libFuzzer targets in OneFuzz.
1. Live reproduction of crashes does not work.
2. The `libfuzzer-coverage` task does not work.
3. Only Linux is supported at this time.
4. Only `aarch64` CPU emulation has been tested. PRs are welcome to support other architectures.
5. Custom setup scripts are not supported, though you can provide your own sysroot using `--sysroot`.
As such, a `libfuzzer qemu_user` template is available, which only uses the `libfuzzer_fuzz` and `libfuzzer_crash_report`. As these issues are resolve, the template will be updated to include the additional tasks.
## Example
Let's build a simple `aarch64` target using GCC as a cross-compiler (See [our example](../../src/integration-tests/libfuzzer-aarch64-crosscompile/)).
1. Make sure you have QEMU and the appropriate cross compiler installed:
```bash
sudo apt update
sudo apt install -y qemu-user g++-aarch64-linux-gnu
```
2. Check out the libFuzzer libraries from `compiler-rt`. Note, GCC requires the use of `pc-guard` for instrumentation, which was removed by the `compiler-rt` project. As such, we need an older version of the library:
```
git clone https://github.com/llvm-mirror/compiler-rt
(cd compiler-rt; git checkout daa6759576548a2f3825faddaa6811cabbfb45eb)
```
3. Build the libFuzzer libraries *without* ASAN:
```
mkdir -p fuzz-libs
(cd fuzz-libs; aarch64-linux-gnu-g++ -c ../compiler-rt/lib/fuzzer/*.cpp)
```
4. Build our target:
```
aarch64-linux-gnu-g++ -pthread -lasan -o fuzz.exe fuzz-libs/*.o fuzz.c -fsanitize=address -fsanitize-coverage=trace-pc
```
5. Verify our target built correctly:
```
ASAN_OPTIONS=:detect_leaks=0 qemu-aarch64 -L /usr/aarch64-linux-gnu ./fuzz.exe -help=1
```
> NOTE: `LSAN` does not work in `qemu-user`, so we need to disable that.
Now we're ready to deploy this target to OneFuzz. Note, if we have custom
libraries or want to run on a different version of linux, we'll need to
provide our own sysroot.
7. Now we can fuzz!
Execute our `fuzz.exe` with `qemu-aarch64` our `inputs` directory:
```
ASAN_OPTIONS=:detect_leaks=0 qemu-aarch64 -L /usr/aarch64-linux-gnu ./fuzz.exe ./inputs
```
In a few seconds, you'll see output that looks something like this:
```
INFO: Seed: 113138795
INFO: 1 files found in ./inputs/ INFO: -max_len is not provided; libFuzzer will not generate inputs larger than 4096 bytes
INFO: seed corpus: files: 1 min: 3b max: 3b total: 3b rss: 314Mb
#2 INITED cov: 5 ft: 5 corp: 1/3b lim: 4 exec/s: 0 rss: 317Mb
#3 NEW cov: 5 ft: 9 corp: 2/6b lim: 4 exec/s: 0 rss: 317Mb L: 3/3 MS: 1 ChangeBit-
#4 NEW cov: 5 ft: 13 corp: 3/9b lim: 4 exec/s: 0 rss: 317Mb L: 3/3 MS: 1 ChangeBit-
#8 NEW cov: 10 ft: 21 corp: 4/13b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 4 ShuffleBytes-ChangeBit-ChangeBinInt-CrossOver-
#9 NEW cov: 10 ft: 26 corp: 5/17b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 1 CopyPart-
#10 NEW cov: 10 ft: 31 corp: 6/21b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 1 ChangeBit-
#11 NEW cov: 10 ft: 36 corp: 7/25b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 1 ShuffleBytes-
#12 NEW cov: 10 ft: 37 corp: 8/28b lim: 4 exec/s: 0 rss: 317Mb L: 3/4 MS: 1 EraseBytes-
#16 NEW cov: 10 ft: 45 corp: 9/32b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 4 CopyPart-CopyPart-CrossOver-ShuffleBytes-
#18 NEW cov: 11 ft: 46 corp: 10/36b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 2 CopyPart-ChangeBit-
#19 NEW cov: 11 ft: 47 corp: 11/40b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 1 ShuffleBytes-
#20 REDUCE cov: 11 ft: 47 corp: 11/39b lim: 4 exec/s: 0 rss: 317Mb L: 2/4 MS: 1 EraseBytes-
#30 NEW cov: 11 ft: 52 corp: 12/43b lim: 4 exec/s: 0 rss: 317Mb L: 4/4 MS: 5 ChangeBit-CrossOver-CrossOver-CrossOver-CrossOver-
#32 NEW cov: 11 ft: 56 corp: 13/45b lim: 4 exec/s: 0 rss: 317Mb L: 2/4 MS: 2 CrossOver-ChangeBit-
#38 REDUCE cov: 11 ft: 56 corp: 13/44b lim: 4 exec/s: 0 rss: 317Mb L: 1/4 MS: 1 EraseBytes-
```
## Launching our example in OneFuzz
These commands launches the a qemu-user based libFuzzer job in OneFuzz. Note, we've added the arguments `--wait_for_running --wait_for_files inputs` such that we can monitor our job until we've seen at least one new input found via fuzzing.
```bash
TARGET_PROJECT=AARCH64
TARGET_NAME=Example
TARGET_BUILD=1
FUZZ_POOL=linux
onefuzz template libfuzzer qemu_user ${TARGET_PROJECT} ${TARGET_NAME} ${TARGET_BUILD} ${FUZZ_POOL} --wait_for_running --wait_for_files inputs
```
When we run this, we'll see output similar to:
```
WARNING:onefuzz:qemu_user jobs are a preview feature and may change in the future
INFO:onefuzz:creating job (runtime: 24 hours)
INFO:onefuzz:created job: fa5b7870-a51b-4f79-924f-2ef11a9830a0
INFO:onefuzz:using container: oft-setup-5346d5f33bc35c3d94cbc70f7815b85e
INFO:onefuzz:using container: oft-inputs-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:using container: oft-crashes-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:using container: oft-reports-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:using container: oft-unique-reports-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:using container: oft-no-repro-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:uploading target exe `fuzz.exe`
INFO:onefuzz:uploading /tmp/tmp_9_f9kc3/setup.sh
INFO:onefuzz:uploading /tmp/tmp_9_f9kc3/fuzz.exe-wrapper.sh
INFO:onefuzz:creating libfuzzer_fuzz task
INFO:onefuzz:creating libfuzzer_crash_report task
INFO:onefuzz:done creating tasks
- waiting on: libfuzzer_crash_report:init, libfuzzer_fuzz:init
- waiting on: libfuzzer_crash_report:waiting, libfuzzer_fuzz:scheduled
| waiting on: libfuzzer_crash_report:waiting, libfuzzer_fuzz:setting_up
/ waiting on: libfuzzer_crash_report:waiting
| waiting on: libfuzzer_crash_report:scheduled
\ waiting on: libfuzzer_crash_report:setting_up
INFO:onefuzz:tasks started
\ waiting for new files: oft-inputs-9c31136dc16a5aab8edf7666a614a285
INFO:onefuzz:new files found
{
"config": {
"build": "1",
"duration": 24,
"name": "Example",
"project": "AARCH64"
},
"end_time": "2021-02-27T16:41:24+00:00",
"job_id": "fa5b7870-a51b-4f79-924f-2ef11a9830a0",
"state": "enabled",
"task_info": [
{
"state": "stopped",
"task_id": "15cc52b9-b15b-4cf7-9fa7-669db67c8e0b",
"type": "libfuzzer_fuzz"
},
{
"state": "running",
"task_id": "b3466396-7047-46f5-a58d-a21ada881e97",
"type": "libfuzzer_crash_report"
}
],
"user_info": {
"application_id": "e3b350d1-7863-4bd5-a4c0-83e6436c9c09",
"object_id": "232a2ac6-f8fc-4eb3-b427-0c91bbab7eea",
"upn": "example@contoso.com"
}
}
```
## See Also
* [afl-unicorn](https://github.com/Battelle/afl-unicorn) - AFL-based application fuzzing using [Unicorn](https://www.unicorn-engine.org/)
* [TriforceAFL] (https://github.com/nccgroup/TriforceAFL) - AFL-based full-system fuzzing using a fork of [QEMU](https://qemu.readthedocs.io/)

202
src/cli/onefuzz/templates/libfuzzer.py
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@ -4,6 +4,8 @@
# Licensed under the MIT License. # Licensed under the MIT License.
import os import os
import tempfile
from enum import Enum
from typing import Dict, List, Optional from typing import Dict, List, Optional
from onefuzztypes.enums import OS, ContainerType, TaskDebugFlag, TaskType from onefuzztypes.enums import OS, ContainerType, TaskDebugFlag, TaskType
@ -17,6 +19,10 @@ from . import JobHelper
LIBFUZZER_MAGIC_STRING = b"ERROR: libFuzzer" LIBFUZZER_MAGIC_STRING = b"ERROR: libFuzzer"
class QemuArch(Enum):
aarch64 = "aarch64"
class Libfuzzer(Command): class Libfuzzer(Command):
""" Pre-defined Libfuzzer job """ """ Pre-defined Libfuzzer job """
@ -488,3 +494,199 @@ class Libfuzzer(Command):
self.logger.info("done creating tasks") self.logger.info("done creating tasks")
helper.wait() helper.wait()
return helper.job return helper.job
def qemu_user(
self,
project: str,
name: str,
build: str,
pool_name: PoolName,
*,
arch: QemuArch = QemuArch.aarch64,
target_exe: File = File("fuzz.exe"),
sysroot: Optional[File] = None,
vm_count: int = 1,
inputs: Optional[Directory] = None,
reboot_after_setup: bool = False,
duration: int = 24,
target_workers: Optional[int] = 1,
target_options: Optional[List[str]] = None,
target_env: Optional[Dict[str, str]] = None,
tags: Optional[Dict[str, str]] = None,
wait_for_running: bool = False,
wait_for_files: Optional[List[ContainerType]] = None,
existing_inputs: Optional[Container] = None,
debug: Optional[List[TaskDebugFlag]] = None,
ensemble_sync_delay: Optional[int] = None,
colocate_all_tasks: bool = False,
crash_report_timeout: Optional[int] = 1,
check_retry_count: Optional[int] = 300,
check_fuzzer_help: bool = True,
) -> Optional[Job]:
"""
libfuzzer tasks, wrapped via qemu-user (PREVIEW FEATURE)
"""
self.logger.warning(
"qemu_user jobs are a preview feature and may change in the future"
)
pool = self.onefuzz.pools.get(pool_name)
if pool.os != OS.linux:
raise Exception("libfuzzer qemu-user jobs are only compatible with Linux")
self._check_is_libfuzzer(target_exe)
if target_options is None:
target_options = []
# disable detect_leaks, as this is non-functional on cross-compile targets
if target_env is None:
target_env = {}
target_env["ASAN_OPTIONS"] = (
target_env.get("ASAN_OPTIONS", "") + ":detect_leaks=0"
)
helper = JobHelper(
self.onefuzz,
self.logger,
project,
name,
build,
duration,
pool_name=pool_name,
target_exe=target_exe,
)
helper.add_tags(tags)
helper.define_containers(
ContainerType.setup,
ContainerType.inputs,
ContainerType.crashes,
ContainerType.reports,
ContainerType.unique_reports,
ContainerType.no_repro,
)
if existing_inputs:
self.onefuzz.containers.get(existing_inputs)
helper.containers[ContainerType.inputs] = existing_inputs
else:
helper.define_containers(ContainerType.inputs)
fuzzer_containers = [
(ContainerType.setup, helper.containers[ContainerType.setup]),
(ContainerType.crashes, helper.containers[ContainerType.crashes]),
(ContainerType.inputs, helper.containers[ContainerType.inputs]),
]
helper.create_containers()
target_exe_blob_name = helper.target_exe_blob_name(target_exe, None)
wrapper_name = File(target_exe_blob_name + "-wrapper.sh")
with tempfile.TemporaryDirectory() as tempdir:
if sysroot:
setup_path = File(os.path.join(tempdir, "setup.sh"))
with open(setup_path, "w") as handle:
sysroot_filename = helper.target_exe_blob_name(sysroot, None)
handle.write(
"#!/bin/bash\n"
"set -ex\n"
"sudo apt-get install -y qemu-user g++-aarch64-linux-gnu libasan5-arm64-cross\n"
'cd $(dirname "$(readlink -f "$0")")\n'
"mkdir -p sysroot\n"
"tar -C sysroot -zxvf %s\n" % sysroot_filename
)
wrapper_path = File(os.path.join(tempdir, wrapper_name))
with open(wrapper_path, "w") as handle:
handle.write(
"#!/bin/bash\n"
'SETUP_DIR=$(dirname "$(readlink -f "$0")")\n'
"qemu-%s -L $SETUP_DIR/sysroot $SETUP_DIR/%s $*"
% (arch.name, target_exe_blob_name)
)
upload_files = [setup_path, wrapper_path, sysroot]
else:
setup_path = File(os.path.join(tempdir, "setup.sh"))
with open(setup_path, "w") as handle:
handle.write(
"#!/bin/bash\n"
"set -ex\n"
"sudo apt-get install -y qemu-user g++-aarch64-linux-gnu libasan5-arm64-cross\n"
)
wrapper_path = File(os.path.join(tempdir, wrapper_name))
with open(wrapper_path, "w") as handle:
handle.write(
"#!/bin/bash\n"
'SETUP_DIR=$(dirname "$(readlink -f "$0")")\n'
"qemu-%s -L /usr/%s-linux-gnu $SETUP_DIR/%s $*"
% (arch.name, arch.name, target_exe_blob_name)
)
upload_files = [setup_path, wrapper_path]
helper.upload_setup(None, target_exe, upload_files)
if inputs:
helper.upload_inputs(inputs)
helper.wait_on(wait_for_files, wait_for_running)
self.logger.info("creating libfuzzer_fuzz task")
fuzzer_task = self.onefuzz.tasks.create(
helper.job.job_id,
TaskType.libfuzzer_fuzz,
wrapper_name,
fuzzer_containers,
pool_name=pool_name,
reboot_after_setup=reboot_after_setup,
duration=duration,
vm_count=vm_count,
target_options=target_options,
target_env=target_env,
target_workers=target_workers,
tags=tags,
debug=debug,
ensemble_sync_delay=ensemble_sync_delay,
expect_crash_on_failure=False,
check_fuzzer_help=check_fuzzer_help,
)
report_containers = [
(ContainerType.setup, helper.containers[ContainerType.setup]),
(ContainerType.crashes, helper.containers[ContainerType.crashes]),
(ContainerType.reports, helper.containers[ContainerType.reports]),
(
ContainerType.unique_reports,
helper.containers[ContainerType.unique_reports],
),
(ContainerType.no_repro, helper.containers[ContainerType.no_repro]),
]
self.logger.info("creating libfuzzer_crash_report task")
self.onefuzz.tasks.create(
helper.job.job_id,
TaskType.libfuzzer_crash_report,
wrapper_name,
report_containers,
pool_name=pool_name,
duration=duration,
vm_count=1,
reboot_after_setup=reboot_after_setup,
target_options=target_options,
target_env=target_env,
tags=tags,
prereq_tasks=[fuzzer_task.task_id],
target_timeout=crash_report_timeout,
check_retry_count=check_retry_count,
debug=debug,
colocate=colocate_all_tasks,
expect_crash_on_failure=False,
check_fuzzer_help=check_fuzzer_help,
)
self.logger.info("done creating tasks")
helper.wait()
return helper.job

26
src/integration-tests/integration-test.py
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@ -42,6 +42,7 @@ BUILD = "0"
class TemplateType(Enum): class TemplateType(Enum):
libfuzzer = "libfuzzer" libfuzzer = "libfuzzer"
libfuzzer_dotnet = "libfuzzer_dotnet" libfuzzer_dotnet = "libfuzzer_dotnet"
libfuzzer_qemu_user = "libfuzzer_qemu_user"
afl = "afl" afl = "afl"
radamsa = "radamsa" radamsa = "radamsa"
@ -57,6 +58,7 @@ class Integration(BaseModel):
check_asan_log: Optional[bool] = Field(default=False) check_asan_log: Optional[bool] = Field(default=False)
disable_check_debugger: Optional[bool] = Field(default=False) disable_check_debugger: Optional[bool] = Field(default=False)
reboot_after_setup: Optional[bool] = Field(default=False) reboot_after_setup: Optional[bool] = Field(default=False)
test_repro: Optional[bool] = Field(default=True)
TARGETS: Dict[str, Integration] = { TARGETS: Dict[str, Integration] = {
@ -84,6 +86,15 @@ TARGETS: Dict[str, Integration] = {
use_setup=True, use_setup=True,
wait_for_files=[ContainerType.inputs, ContainerType.crashes], wait_for_files=[ContainerType.inputs, ContainerType.crashes],
), ),
"linux-libfuzzer-aarch64-crosscompile": Integration(
template=TemplateType.libfuzzer_qemu_user,
os=OS.linux,
target_exe="fuzz.exe",
inputs="inputs",
use_setup=True,
wait_for_files=[ContainerType.inputs, ContainerType.crashes],
test_repro=False,
),
"linux-libfuzzer-rust": Integration( "linux-libfuzzer-rust": Integration(
template=TemplateType.libfuzzer, template=TemplateType.libfuzzer,
os=OS.linux, os=OS.linux,
@ -237,6 +248,17 @@ class TestOnefuzz:
duration=1, duration=1,
vm_count=1, vm_count=1,
) )
elif config.template == TemplateType.libfuzzer_qemu_user:
job = self.of.template.libfuzzer.qemu_user(
self.project,
target,
BUILD,
self.pools[config.os].name,
inputs=inputs,
target_exe=target_exe,
duration=1,
vm_count=1,
)
elif config.template == TemplateType.radamsa: elif config.template == TemplateType.radamsa:
job = self.of.template.radamsa.basic( job = self.of.template.radamsa.basic(
self.project, self.project,
@ -407,6 +429,10 @@ class TestOnefuzz:
has_cdb = bool(which("cdb.exe")) has_cdb = bool(which("cdb.exe"))
has_gdb = bool(which("gdb")) has_gdb = bool(which("gdb"))
for job_id in self.successful_jobs: for job_id in self.successful_jobs:
if not TARGETS[self.target_jobs[job_id]].test_repro:
self.logger.info("skipping repro for %s", self.target_jobs[job_id])
continue
if self.job_os[job_id] == OS.linux and not has_gdb: if self.job_os[job_id] == OS.linux and not has_gdb:
self.logger.warning( self.logger.warning(
"missing gdb in path, not launching repro: %s", "missing gdb in path, not launching repro: %s",

3
src/integration-tests/libfuzzer-aarch64-crosscompile/.gitignore vendored Normal file
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@ -0,0 +1,3 @@
compiler-rt
fuzz-libs
fuzz.exe

31
src/integration-tests/libfuzzer-aarch64-crosscompile/Makefile Normal file
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@ -0,0 +1,31 @@
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
all: check
fuzz-libs:
sudo apt update
sudo apt install -y qemu-user g++-aarch64-linux-gnu
git clone https://github.com/llvm-mirror/compiler-rt
# last version that supports pc-guard instrumentation, required by GCC
(cd compiler-rt; git checkout daa6759576548a2f3825faddaa6811cabbfb45eb)
# These *must* be built without ASAN
mkdir -p fuzz-libs
(cd fuzz-libs; aarch64-linux-gnu-g++ -c ../compiler-rt/lib/fuzzer/*.cpp)
fuzz.exe: fuzz-libs fuzz.c
aarch64-linux-gnu-g++ -pthread -lasan -o fuzz.exe fuzz-libs/*.o fuzz.c -fsanitize=address -fsanitize-coverage=trace-pc
check: fuzz.exe
ASAN_OPTIONS=:detect_leaks=0 qemu-aarch64 -L /usr/aarch64-linux-gnu ./fuzz.exe -runs=1
fuzz: check
ASAN_OPTIONS=:detect_leaks=0 qemu-aarch64 -L /usr/aarch64-linux-gnu ./fuzz.exe
.PHONY: check clean fuzz
clean:
rm -rf fuzz.exe fuzz-libs compiler-rt

64
src/integration-tests/libfuzzer-aarch64-crosscompile/fuzz.c Normal file
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@ -0,0 +1,64 @@
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#include <stdlib.h>
extern "C" int LLVMFuzzerTestOneInput(const u_int8_t *data, size_t len) {
int cnt = 0;
if (len < 4) {
return 0;
}
if (data[0] == 'x') { cnt++; }
if (data[1] == 'y') { cnt++; }
if (data[2] == 'z') { cnt++; }
if (cnt >= 3) {
switch (data[3]) {
case '0': {
// segv
int *p = NULL; *p = 123;
break;
}
case '1': {
// stack-buffer-underflow
int* p = &cnt - 32; for (int i = 0; i < 32; i++) { *(p + i) = 0; }
break;
}
case '2': {
// stack-buffer-overflow
int* p = &cnt + 32; for (int i = 0; i < 32; i++) { *(p - i) = 0; }
break;
}
case '3': {
// bad-free
int *p = &cnt; free(p);
break;
}
case '4': {
// double-free
int* p = (int *) malloc(sizeof(int)); free(p); free(p);
break;
}
case '5': {
// heap-use-after-free
int* p = (int *) malloc(sizeof(int)); free(p); *p = 123;
break;
}
case '6': {
// heap-buffer-overflow
int* p = (int *) malloc(8 * sizeof(int)); for (int i = 0; i < 32; i++) { *(p + i) = 0; }
break;
}
case '7': {
// fpe
int x = 0; int y = 123 / x;
break;
}
}
}
return 0;
}

1
src/integration-tests/libfuzzer-aarch64-crosscompile/inputs/hi.txt Normal file
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@ -0,0 +1 @@
hi

12
src/integration-tests/libfuzzer/simple.c
View File

@ -9,7 +9,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t len) {
int cnt = 0; int cnt = 0;
if (len < 4) { if (len < 4) {
return 1; return 0;
} }
if (data[0] == 'x') { cnt++; } if (data[0] == 'x') { cnt++; }
@ -40,17 +40,17 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t len) {
} }
case '4': { case '4': {
// double-free // double-free
int* p = malloc(sizeof(int)); free(p); free(p); int* p = (int *) malloc(sizeof(int)); free(p); free(p);
break; break;
} }
case '5': { case '5': {
// heap-use-after-free // heap-use-after-free
int* p = malloc(sizeof(int)); free(p); *p = 123; int* p = (int *) malloc(sizeof(int)); free(p); *p = 123;
break; break;
} }
case '6': { case '6': {
// heap-buffer-overflow // heap-buffer-overflow
int* p = malloc(8 * sizeof(int)); for (int i = 0; i < 32; i++) { *(p + i) = 0; } int* p = (int *) malloc(8 * sizeof(int)); for (int i = 0; i < 32; i++) { *(p + i) = 0; }
break; break;
} }
case '7': { case '7': {
@ -58,6 +58,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t len) {
int x = 0; int y = 123 / x; int x = 0; int y = 123 / x;
break; break;
} }
case '8': {
abort();
break;
}
} }
} }