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Merge pull request 'updated ptrguard to use system_info for minimum calculations' (#144) from clr-fix-attempt into 2.0.3

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Reviewed-on: #144
This commit was merged in pull request #144.
This commit is contained in:
cake
2026-01-20 16:09:57 +00:00
parent e6df37bcca 995e11371a
commit d83ca98008
2 changed files with 44 additions and 9 deletions
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34
LightlessSync/Utils/PtrGuard.cs
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@@ -5,19 +5,35 @@ namespace LightlessSync.Utils
{
public static partial class PtrGuard
{
private const ulong _minLikelyPtr = 0x0000_0001_0000_0000UL;
private const ulong _maxUserPtr = 0x0000_7FFF_FFFF_FFFFUL;
private const ulong _aligmentPtr = 0x7UL;
private static readonly nuint _minAppAddr = (nuint)GetMinAppAddr();
private static readonly nuint _maxAppAddr = (nuint)GetMaxAppAddr();
public static bool LooksLikePtr(nint p)
private static nint GetMinAppAddr()
{
if (p == 0) return false;
var u = (ulong)p;
if (u < _minLikelyPtr) return false;
if (u > _maxUserPtr) return false;
if ((u & _aligmentPtr) != 0) return false;
return true;
GetSystemInfo(out var si);
return si.lpMinimumApplicationAddress;
}
private static nint GetMaxAppAddr()
{
GetSystemInfo(out var si);
return si.lpMaximumApplicationAddress;
}
public static bool LooksLikePtr(nint p)
{
if (p == 0) return false;
nuint u = (nuint)p;
if (u < _minAppAddr) return false;
if (u > _maxAppAddr) return false;
if ((u & _aligmentPtr) != 0) return false;
if ((uint)u == 0x12345679u) return false;
return true;
}
public static bool TryReadIntPtr(nint addr, out nint value)
{
value = 0;

19
LightlessSync/Utils/PtrGuardMemory.cs
View File

@@ -32,5 +32,24 @@ namespace LightlessSync.Utils
[DllImport("kernel32.dll")]
internal static extern nint GetCurrentProcess();
[DllImport("kernel32.dll")]
internal static extern void GetSystemInfo(out SYSTEM_INFO lpSystemInfo);
[StructLayout(LayoutKind.Sequential)]
internal struct SYSTEM_INFO
{
public ushort wProcessorArchitecture;
public ushort wReserved;
public uint dwPageSize;
public nint lpMinimumApplicationAddress;
public nint lpMaximumApplicationAddress;
public nint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public ushort wProcessorLevel;
public ushort wProcessorRevision;
}
}
}