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Add fuzzer for core helper functions #1153

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merged 2 commits into from Jun 10, 2022
Merged

Add fuzzer for core helper functions #1153

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d292184
WIP: core helper fuzzer scaffolding
dthaler May 25, 2022
6b69c4a
Fix bug in _find_lpm_map_entry() hit by fuzzer
dthaler Jun 9, 2022
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15 changes: 14 additions & 1 deletion .github/workflows/cicd.yml
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Expand Up @@ -58,7 +58,7 @@ jobs:
build_artifact: Build-x64-fuzzer
cxx_flags: /fsanitize-coverage=inline-bool-flag /fsanitize-coverage=edge /fsanitize-coverage=trace-cmp /fsanitize-coverage=trace-div /ZH:SHA_256
ld_flags: '"clang_rt.fuzzer_MD-x86_64.lib" "libsancov.lib"'
build_options: /p:Fuzzer='True' /t:tests\libfuzzer\execution_context_fuzzer /t:tests\libfuzzer\bpf2c_fuzzer /t:tests\libfuzzer\verifier_fuzzer
build_options: /p:Fuzzer='True' /t:tests\libfuzzer\execution_context_fuzzer /t:tests\libfuzzer\bpf2c_fuzzer /t:tests\libfuzzer\verifier_fuzzer /t:tests\libfuzzer\core_helper_fuzzer

# Run the unit tests in GitHub.
unit_tests:
Expand Down Expand Up @@ -179,6 +179,19 @@ jobs:
code_coverage: false
gather_dumps: true

core_helper_fuzzer:
needs: libfuzzer
# Always run this job.
if: github.event_name == 'schedule' || github.event_name == 'pull_request'
uses: ./.github/workflows/reusable-test.yml
with:
name: core_helper_fuzzer
test_command: core_helper_fuzzer core_helper_corpus -max_len=139 -runs=1000 -use_value_profile=1 -artifact_prefix=Artifacts\
build_artifact: Build-x64-fuzzer
environment: windows-2019
code_coverage: false
gather_dumps: true

# Run Cilium regression tests in GitHub.
cilium_tests:
needs: regular
Expand Down
23 changes: 23 additions & 0 deletions ebpf-for-windows.sln
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Expand Up @@ -160,6 +160,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "bpf2c_fuzzer", "tests\libfu
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "verifier_fuzzer", "tests\libfuzzer\verifier\verifier_fuzzer.vcxproj", "{DCF12929-B975-4874-A80F-9EAF1CC5A5A0}"
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "core_helper_fuzzer", "tests\libfuzzer\core_helper_fuzzer\core_helper_fuzzer.vcxproj", "{88A3E85F-669F-4CEA-8207-2E1545528D62}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|ARM = Debug|ARM
Expand Down Expand Up @@ -1511,6 +1513,26 @@ Global
{DCF12929-B975-4874-A80F-9EAF1CC5A5A0}.RelWithDebInfo|x64.Build.0 = Release|x64
{DCF12929-B975-4874-A80F-9EAF1CC5A5A0}.RelWithDebInfo|x86.ActiveCfg = Debug|x64
{DCF12929-B975-4874-A80F-9EAF1CC5A5A0}.RelWithDebInfo|x86.Build.0 = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Debug|ARM.ActiveCfg = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Debug|ARM64.ActiveCfg = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Debug|x64.ActiveCfg = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Debug|x64.Build.0 = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Debug|x86.ActiveCfg = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.MinSizeRel|ARM.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.MinSizeRel|ARM64.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.MinSizeRel|x64.ActiveCfg = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.MinSizeRel|x64.Build.0 = Debug|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.MinSizeRel|x86.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Release|ARM.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Release|ARM64.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Release|x64.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Release|x64.Build.0 = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.Release|x86.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.RelWithDebInfo|ARM.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.RelWithDebInfo|ARM64.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.RelWithDebInfo|x64.ActiveCfg = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.RelWithDebInfo|x64.Build.0 = Release|x64
{88A3E85F-669F-4CEA-8207-2E1545528D62}.RelWithDebInfo|x86.ActiveCfg = Release|x64
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
Expand Down Expand Up @@ -1565,6 +1587,7 @@ Global
{6116AE11-5296-4DE9-8A8E-5380B789907E} = {E184CBC2-4B62-499F-8A4A-F15A5A182259}
{A0A0D663-DCF7-4BB1-9DDB-7964C3C31603} = {E184CBC2-4B62-499F-8A4A-F15A5A182259}
{DCF12929-B975-4874-A80F-9EAF1CC5A5A0} = {E184CBC2-4B62-499F-8A4A-F15A5A182259}
{88A3E85F-669F-4CEA-8207-2E1545528D62} = {E184CBC2-4B62-499F-8A4A-F15A5A182259}
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {3D5F862D-74C6-4357-9F95-0B152E33B7B8}
Expand Down
11 changes: 6 additions & 5 deletions libs/execution_context/ebpf_maps.c
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Expand Up @@ -280,7 +280,7 @@ _delete_array_map(_In_ _Post_invalid_ ebpf_core_map_t* map)

static ebpf_result_t
_find_array_map_entry(
_In_ ebpf_core_map_t* map, _In_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
_In_ ebpf_core_map_t* map, _In_opt_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
{
uint32_t key_value;
if (!map || !key || delete_on_success)
Expand Down Expand Up @@ -929,7 +929,7 @@ _delete_hash_map_entry(_In_ ebpf_core_map_t* map, _In_ const uint8_t* key);

static ebpf_result_t
_find_hash_map_entry(
_In_ ebpf_core_map_t* map, _In_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
_In_ ebpf_core_map_t* map, _In_opt_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
{
uint8_t* value = NULL;
if (!map || !key)
Expand Down Expand Up @@ -1254,14 +1254,15 @@ _create_lpm_map(

static ebpf_result_t
_find_lpm_map_entry(
_In_ ebpf_core_map_t* map, _In_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
_In_ ebpf_core_map_t* map, _In_opt_ const uint8_t* key, _In_ bool delete_on_success, _Outptr_ uint8_t** data)
{
if (!map || !key || delete_on_success)
return EBPF_INVALID_ARGUMENT;

uint32_t* prefix_length = (uint32_t*)key;
uint32_t original_prefix_length = *prefix_length;
uint8_t* value = NULL;
ebpf_core_lpm_map_t* trie_map = EBPF_FROM_FIELD(ebpf_core_lpm_map_t, core_map, map);
if (!map || !key || delete_on_success)
return EBPF_INVALID_ARGUMENT;

ebpf_bitmap_cursor_t cursor;
ebpf_bitmap_start_reverse_search((ebpf_bitmap_t*)trie_map->data, &cursor);
Expand Down
9 changes: 9 additions & 0 deletions scripts/create_core_helper_corpus.bat
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@@ -0,0 +1,9 @@
@echo off
rem Copyright (c) Microsoft Corporation
rem SPDX-License-Identifier: MIT
rem
rem Usage: create_core_helper_corpus.bat <solution_path> <output_directory>

set SOLUTIONPATH=%1
set OUTPUTPATH=%2
xcopy /d /i /y "%SOLUTIONPATH%\tests\libfuzzer\core_helper_fuzzer\corpus" "%OUTPUTPATH%"
2 changes: 1 addition & 1 deletion tests/libfuzzer/README.md
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Expand Up @@ -15,7 +15,7 @@ There are now four libFuzzer-based binaries:
1) Copy the libFuzzer binary and existing corpus to a test machine (currently only Windows 10 and Server 2019 are supported).
2) Start the libFuzzer binary, pass the path to the corpus folder, and maximum time to run:
* `bpf2c_fuzzer.exe bpf2c_fuzzer_corpus -use_value_profile=1 -max_total_time=1800`
* `core_helper_fuzzer.exe core_helper_fuzzer core_helper_corpus -max_len=139 -runs=3000 -use_value_profile=1`
* `core_helper_fuzzer.exe core_helper_fuzzer core_helper_corpus -max_len=139 -runs=2000 -use_value_profile=1`
* `execution_context_fuzzer.exe execution_context_fuzzer_corpus -use_value_profile=1 -max_total_time=1800`
* `verifier_fuzzer.exe verifier_corpus -use_value_profile=1 -max_total_time=1800`
3) If the fuzzer hits an issue, it will display the stack trace and create a file containing the input that triggered the crash.
Expand Down
102 changes: 102 additions & 0 deletions tests/libfuzzer/core_helper_fuzzer/core_helper_fuzzer.vcxproj
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<?xml version="1.0" encoding="utf-8"?>
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<!--
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31 changes: 31 additions & 0 deletions tests/libfuzzer/core_helper_fuzzer/core_helper_fuzzer.vcxproj.filters
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2 changes: 2 additions & 0 deletions tests/libfuzzer/core_helper_fuzzer/corpus/bpf_csum_diff
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��������������������
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