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Fix virtual address overflow near ulong limit (#2044)
* Fix virtual address overflow near ulong limit * Fix comments * Improve overflow checking for large size values * Add overflow checking to AddressSpaceManager class * Add overflow protection to read and write functions
This commit is contained in:
Caian Benedicto
GitHub
parent
fd9d16c3b3
commit
f7b2daf5ec
2 changed files with 134 additions and 32 deletions
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@ -83,6 +83,8 @@ namespace Ryujinx.Cpu
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/// <param name="size">Size to be mapped</param>
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public void Map(ulong va, ulong pa, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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ulong remainingSize = size;
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ulong oVa = va;
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ulong oPa = pa;
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@ -110,6 +112,8 @@ namespace Ryujinx.Cpu
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return;
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}
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AssertValidAddressAndSize(va, size);
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UnmapEvent?.Invoke(va, size);
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ulong remainingSize = size;
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@ -214,6 +218,8 @@ namespace Ryujinx.Cpu
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{
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try
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{
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AssertValidAddressAndSize(va, (ulong)data.Length);
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if (IsContiguousAndMapped(va, data.Length))
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{
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data.CopyTo(_backingMemory.GetSpan(GetPhysicalAddressInternal(va), data.Length));
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@ -345,6 +351,23 @@ namespace Ryujinx.Cpu
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return ref _backingMemory.GetRef<T>(GetPhysicalAddressInternal(va));
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}
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/// <summary>
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/// Computes the number of pages in a virtual address range.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range</param>
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/// <param name="startVa">The virtual address of the beginning of the first page</param>
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/// <remarks>This function does not differentiate between allocated and unallocated pages.</remarks>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetPagesCount(ulong va, uint size, out ulong startVa)
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{
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// WARNING: Always check if ulong does not overflow during the operations.
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startVa = va & ~(ulong)PageMask;
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ulong vaSpan = (va - startVa + size + PageMask) & ~(ulong)PageMask;
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return (int)(vaSpan / PageSize);
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}
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private void ThrowMemoryNotContiguous() => throw new MemoryNotContiguousException();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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@ -353,16 +376,12 @@ namespace Ryujinx.Cpu
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private bool IsContiguous(ulong va, int size)
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{
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if (!ValidateAddress(va))
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if (!ValidateAddress(va) || !ValidateAddressAndSize(va, (ulong)size))
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{
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return false;
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}
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ulong endVa = (va + (ulong)size + PageMask) & ~(ulong)PageMask;
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va &= ~(ulong)PageMask;
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int pages = (int)((endVa - va) / PageSize);
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int pages = GetPagesCount(va, (uint)size, out va);
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for (int page = 0; page < pages - 1; page++)
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{
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@ -391,16 +410,12 @@ namespace Ryujinx.Cpu
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/// <returns>Array of physical regions</returns>
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public (ulong address, ulong size)[] GetPhysicalRegions(ulong va, ulong size)
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{
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if (!ValidateAddress(va))
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if (!ValidateAddress(va) || !ValidateAddressAndSize(va, size))
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{
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return null;
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}
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ulong endVa = (va + size + PageMask) & ~(ulong)PageMask;
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va &= ~(ulong)PageMask;
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int pages = (int)((endVa - va) / PageSize);
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int pages = GetPagesCount(va, (uint)size, out va);
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List<(ulong, ulong)> regions = new List<(ulong, ulong)>();
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@ -441,6 +456,8 @@ namespace Ryujinx.Cpu
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try
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{
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AssertValidAddressAndSize(va, (ulong)data.Length);
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int offset = 0, size;
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if ((va & PageMask) != 0)
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@ -485,11 +502,14 @@ namespace Ryujinx.Cpu
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return true;
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}
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ulong endVa = (va + size + PageMask) & ~(ulong)PageMask;
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if (!ValidateAddressAndSize(va, size))
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{
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return false;
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}
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va &= ~(ulong)PageMask;
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int pages = GetPagesCount(va, (uint)size, out va);
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while (va < endVa)
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for (int page = 0; page < pages; page++)
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{
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if (!IsMapped(va))
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{
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@ -523,6 +543,32 @@ namespace Ryujinx.Cpu
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return va < _addressSpaceSize;
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}
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/// <summary>
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/// Checks if the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <returns>True if the combination of virtual address and size is part of the addressable space</returns>
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private bool ValidateAddressAndSize(ulong va, ulong size)
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{
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ulong endVa = va + size;
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return endVa >= va && endVa >= size && endVa <= _addressSpaceSize;
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}
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/// <summary>
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/// Ensures the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified outside the addressable space</exception>
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private void AssertValidAddressAndSize(ulong va, ulong size)
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{
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if (!ValidateAddressAndSize(va, size))
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{
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throw new InvalidMemoryRegionException($"va=0x{va:X16}, size=0x{size:X16}");
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}
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}
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/// <summary>
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/// Performs address translation of the address inside a CPU mapped memory range.
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/// </summary>
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@ -555,6 +601,8 @@ namespace Ryujinx.Cpu
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/// <param name="protection">Memory protection to set</param>
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public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
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{
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AssertValidAddressAndSize(va, size);
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// Protection is inverted on software pages, since the default value is 0.
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protection = (~protection) & MemoryPermission.ReadAndWrite;
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@ -565,12 +613,13 @@ namespace Ryujinx.Cpu
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_ => 3L << PointerTagBit
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};
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ulong endVa = (va + size + PageMask) & ~(ulong)PageMask;
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int pages = GetPagesCount(va, (uint)size, out va);
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ulong pageStart = va >> PageBits;
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long invTagMask = ~(0xffffL << 48);
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while (va < endVa)
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for (int page = 0; page < pages; page++)
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{
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ref long pageRef = ref _pageTable.GetRef<long>((va >> PageBits) * PteSize);
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ref long pageRef = ref _pageTable.GetRef<long>(pageStart * PteSize);
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long pte;
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@ -580,7 +629,7 @@ namespace Ryujinx.Cpu
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}
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while (Interlocked.CompareExchange(ref pageRef, (pte & invTagMask) | tag, pte) != pte);
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va += PageSize;
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pageStart++;
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}
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}
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@ -627,17 +676,20 @@ namespace Ryujinx.Cpu
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/// <param name="size">Size of the region</param>
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public void SignalMemoryTracking(ulong va, ulong size, bool write)
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{
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AssertValidAddressAndSize(va, size);
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// We emulate guard pages for software memory access. This makes for an easy transition to
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// tracking using host guard pages in future, but also supporting platforms where this is not possible.
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// Write tag includes read protection, since we don't have any read actions that aren't performed before write too.
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long tag = (write ? 3L : 1L) << PointerTagBit;
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ulong endVa = (va + size + PageMask) & ~(ulong)PageMask;
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int pages = GetPagesCount(va, (uint)size, out va);
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ulong pageStart = va >> PageBits;
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while (va < endVa)
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for (int page = 0; page < pages; page++)
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{
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ref long pageRef = ref _pageTable.GetRef<long>((va >> PageBits) * PteSize);
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ref long pageRef = ref _pageTable.GetRef<long>(pageStart * PteSize);
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long pte;
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@ -649,7 +701,7 @@ namespace Ryujinx.Cpu
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break;
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}
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va += PageSize;
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pageStart++;
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}
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}
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@ -64,6 +64,8 @@ namespace Ryujinx.Memory
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/// <param name="size">Size to be mapped</param>
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public void Map(ulong va, ulong pa, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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while (size != 0)
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{
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PtMap(va, pa);
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@ -81,6 +83,8 @@ namespace Ryujinx.Memory
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/// <param name="size">Size of the range to be unmapped</param>
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public void Unmap(ulong va, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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while (size != 0)
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{
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PtUnmap(va);
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@ -138,6 +142,8 @@ namespace Ryujinx.Memory
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return;
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}
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AssertValidAddressAndSize(va, (ulong)data.Length);
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if (IsContiguousAndMapped(va, data.Length))
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{
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data.CopyTo(_backingMemory.GetSpan(GetPhysicalAddressInternal(va), data.Length));
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@ -254,6 +260,23 @@ namespace Ryujinx.Memory
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return ref _backingMemory.GetRef<T>(GetPhysicalAddressInternal(va));
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}
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/// <summary>
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/// Computes the number of pages in a virtual address range.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range</param>
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/// <param name="startVa">The virtual address of the beginning of the first page</param>
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/// <remarks>This function does not differentiate between allocated and unallocated pages.</remarks>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetPagesCount(ulong va, uint size, out ulong startVa)
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{
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// WARNING: Always check if ulong does not overflow during the operations.
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startVa = va & ~(ulong)PageMask;
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ulong vaSpan = (va - startVa + size + PageMask) & ~(ulong)PageMask;
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return (int)(vaSpan / PageSize);
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}
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private void ThrowMemoryNotContiguous() => throw new MemoryNotContiguousException();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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@ -262,16 +285,12 @@ namespace Ryujinx.Memory
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private bool IsContiguous(ulong va, int size)
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{
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if (!ValidateAddress(va))
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if (!ValidateAddress(va) || !ValidateAddressAndSize(va, (ulong)size))
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{
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return false;
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}
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ulong endVa = (va + (ulong)size + PageMask) & ~(ulong)PageMask;
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va &= ~(ulong)PageMask;
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int pages = (int)((endVa - va) / PageSize);
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int pages = GetPagesCount(va, (uint)size, out va);
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for (int page = 0; page < pages - 1; page++)
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{
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@ -310,6 +329,8 @@ namespace Ryujinx.Memory
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return;
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}
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AssertValidAddressAndSize(va, (ulong)data.Length);
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int offset = 0, size;
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if ((va & PageMask) != 0)
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@ -362,11 +383,14 @@ namespace Ryujinx.Memory
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return true;
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}
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ulong endVa = (va + size + PageMask) & ~(ulong)PageMask;
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if (!ValidateAddressAndSize(va, size))
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{
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return false;
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}
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va &= ~(ulong)PageMask;
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int pages = GetPagesCount(va, (uint)size, out va);
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while (va < endVa)
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for (int page = 0; page < pages; page++)
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{
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if (!IsMapped(va))
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{
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@ -384,6 +408,32 @@ namespace Ryujinx.Memory
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return va < _addressSpaceSize;
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}
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/// <summary>
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/// Checks if the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <returns>True if the combination of virtual address and size is part of the addressable space</returns>
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private bool ValidateAddressAndSize(ulong va, ulong size)
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{
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ulong endVa = va + size;
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return endVa >= va && endVa >= size && endVa <= _addressSpaceSize;
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}
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/// <summary>
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/// Ensures the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified outside the addressable space</exception>
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private void AssertValidAddressAndSize(ulong va, ulong size)
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{
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if (!ValidateAddressAndSize(va, size))
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{
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throw new InvalidMemoryRegionException($"va=0x{va:X16}, size=0x{size:X16}");
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}
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}
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/// <summary>
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/// Performs address translation of the address inside a mapped memory range.
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/// </summary>
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