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Fix the fuzzy test #26402

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Merged
TravisEz13 merged 3 commits into from
Nov 7, 2025
Merged

Fix the fuzzy test #26402

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0f24fc7
Fix the fuzzy test
daxian-dbw Nov 6, 2025
707cba7
A bit more cleanup
daxian-dbw Nov 6, 2025
057dcb4
A bit more cleanup (2)
daxian-dbw Nov 6, 2025
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6 changes: 2 additions & 4 deletions test/fuzzing/FuzzingApp/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,7 @@
// Licensed under the MIT License.

using System;
using System.Text;
using SharpFuzz;
using System.Management.Automation.Remoting;

namespace FuzzTests
{
Expand All @@ -27,7 +25,7 @@ public static void FuzzTargetMethod(string[] args)
{
Fuzzer.LibFuzzer.Run(Target.ExtractToken);
}
catch (System.ArgumentNullException nex)
catch (ArgumentNullException nex)
{
Console.WriteLine($"ArgumentNullException in main: {nex.Message}");
Console.WriteLine($"Stack Trace: {nex.StackTrace}");
Expand All @@ -41,5 +39,5 @@ public static void FuzzTargetMethod(string[] args)
Environment.Exit(1);
}
}
}
}
}
3 changes: 0 additions & 3 deletions test/fuzzing/FuzzingApp/Target.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,6 @@
// Licensed under the MIT License.

using System;
using System.Text;
using SharpFuzz;
using System.Management.Automation.Remoting;

namespace FuzzTests
Expand All @@ -16,4 +14,3 @@ public static void ExtractToken(ReadOnlySpan<byte> tokenResponse)
}
}
}

8 changes: 2 additions & 6 deletions test/fuzzing/FuzzingApp/powershell-fuzz-tests.csproj
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Original file line number Diff line number Diff line change
@@ -1,15 +1,11 @@
<Project Sdk="Microsoft.NET.Sdk">

<Import Project="..\..\Test.Common.props"/>

<PropertyGroup>
<Description>PowerShell Fuzzing</Description>
<AssemblyName>powershell-fuzz-tests</AssemblyName>
</PropertyGroup>

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

<PropertyGroup>
Expand Down
80 changes: 35 additions & 45 deletions test/fuzzing/runFuzzer.ps1
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@@ -1,75 +1,65 @@
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.

<#
1. libfuzzer-dotnet-windows.exe can be installed from https://github.com/Metalnem/libfuzzer-dotnet/releases

2. sharpfuzz can be installed with dotnet-tool:
> dotnet tool install --global SharpFuzz.CommandLine --version 2.2.0

Usage: sharpfuzz [path-to-assembly] [prefix ...]

path-to-assembly:
The path to an assembly .dll file to instrument.

prefix:
The class or the namespace to instrument.
If not present, all types in the assembly will be instrumented.
At least one prefix is required when instrumenting System.Private.CoreLib.

Examples:
sharpfuzz Newtonsoft.Json.dll
sharpfuzz System.Private.CoreLib.dll System.Number
sharpfuzz System.Private.CoreLib.dll System.DateTimeFormat System.DateTimeParse
#>

param (
[string]$libFuzzer = ".\libfuzzer-dotnet-windows.exe",
[string]$project = ".\FuzzingApp\powershell-fuzz-tests.csproj",
[Parameter(Mandatory=$true)]
[string]$corpus,
[string]$libFuzzer = "$PSScriptRoot\libfuzzer-dotnet-windows.exe",
[string]$project = "$PSScriptRoot\FuzzingApp\powershell-fuzz-tests.csproj",
[string]$corpus = "$PSScriptRoot\inputs",
[string]$command = "sharpfuzz.exe"
)

Set-StrictMode -Version Latest

$outputDir = "out"
$outputDir = "$PSScriptRoot\out"

if (Test-Path $outputDir) {
Remove-Item -Recurse -Force $outputDir
}

Write-Host "dotnet publish $project -c release -o $outputDir"
dotnet publish $project -c release -o $outputDir
Write-Host "dotnet publish $project -c Debug -o $outputDir"
dotnet publish $project -c Debug -o $outputDir
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Write-Host "build completed"

$projectName = (Get-Item $project).BaseName
$projectDll = "$projectName.dll"
$project = Join-Path $outputDir $projectDll
$smaDllPath = Join-Path $outputDir "System.Management.Automation.dll"

$exclusions = @(
"dnlib.dll",
"SharpFuzz.dll",
"SharpFuzz.Common.dll"
)

$exclusions += $projectDll

## Instrument the specific class within the test assembly.
Write-Host "instrumenting: $project"
& $command $project Target
## !NOTE! If you instrument the class that defines "Main", it will fail.
& $command $project "FuzzTests.Target"
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Write-Host "done instrumenting $project"

$fuzzingTargets = Get-ChildItem $outputDir -Filter *.dll `
| Where-Object { $_.Name -notin $exclusions } `
| Where-Object { $_.Name -notlike "System.*.dll" }
| Where-Object { $_.Name -notlike "Newtonsoft.*.dll" }
| Where-Object { $_.Name -notlike "Microsoft.*.dll" }

foreach ($fuzzingTarget in $fuzzingTargets) {
Write-Output "Instrumenting $fuzzingTarget"
& $command $fuzzingTarget.FullName

if ($LastExitCode -ne 0) {
Write-Error "An error occurred while instrumenting $fuzzingTarget"
exit 1
}
}

$smaDllPath = Join-Path $outputDir "System.Management.Automation.dll"

## Instrument any other assemblies that need to be tested.
Write-Host "instrumenting: $smaDllPath"
& $command $smaDllPath Remoting
& $command $smaDllPath "System.Management.Automation.Remoting.RemoteSessionHyperVSocketClient"
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Write-Host "done instrumenting: $smaDllPath"

$fuzzingTargets += $projectDll
$fuzzingTargets += $smaDllPath

if (($fuzzingTargets | Measure-Object).Count -eq 0) {
Write-Error "No fuzzing targets found"
exit 1
}

$outputPath = Join-Path $outputDir "output.txt"

Write-Host "launching fuzzer on $project"
Write-Host "$libFuzzer --target_path=dotnet --target_arg=$project $corpus"
& $libFuzzer --target_path=dotnet --target_arg=$project $corpus -max_len=1024 2>&1 `
| Tee-Object -FilePath $outputPath
& $libFuzzer --target_path=dotnet --target_arg=$project $corpus -max_len=1024 2>&1 | Tee-Object -FilePath $outputPath
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