cuda.core: validate IPC buffer import size against mapped extent (Glasswing V2.2)#2224
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Andy-Jost wants to merge 1 commit into
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cuda.core: validate IPC buffer import size against mapped extent (Glasswing V2.2)#2224Andy-Jost wants to merge 1 commit into
Andy-Jost wants to merge 1 commit into
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Reject peer-supplied IPCBufferDescriptor sizes larger than the driver-reported allocation extent before storing buf._size, preventing oversized cuMemcpyAsync lengths on imported buffers (Glasswing V2.2).
Andy-Jost
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mdboom
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Jun 15, 2026
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Summary
Addresses Glasswing finding V2.2 (NVBUG 6268889): a peer-supplied
IPCBufferDescriptor.sizewas trusted asbuf._sizeand used as thecuMemcpyAsynclength without checking against the actual mapped allocation extent, enabling an oversized device copy when the receiver imported and copied a forged descriptor.Changes
cuda_core/cuda/core/_memory/_ipc.pyx: afterdeviceptr_import_ipc, queryCU_POINTER_ATTRIBUTE_RANGE_SIZEon the imported pointer and reject descriptors whose advertised size exceeds the mapped extent before callingBuffer_from_deviceptr_handlecuda_core/tests/memory_ipc/test_errors.py:TestImportOversizedBufferDescriptorSize— cross-process harness that forges an oversized size on a valid export payload and asserts import raisesValueErrorTest Coverage
TestImportOversizedBufferDescriptorSize— peer forges oversizedsizeon a valid 64-byte export blob; child import raisesValueError(DeviceMR and PinnedMR parametrizations)Related Work