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[Vulkan/D3D12] Validate upload range bounds before vastcpy

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The D3D12 backend's existing check only validated the last page of the
range. The Vulkan backend had no check at all and did not respect the
gpu_allow_invalid_upload_range cvar. Both now verify start and
end pages are mapped before copying, preventing access violations when
games reference unmapped guest physical memory during transitions.
This commit is contained in:
Herman S.
2026-01-29 15:43:43 +09:00
parent 3e1b0c715a
commit a092551735
2 changed files with 40 additions and 7 deletions
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26
src/xenia/gpu/vulkan/vulkan_shared_memory.cc
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@@ -19,6 +19,8 @@
#include "xenia/gpu/vulkan/vulkan_command_processor.h"
#include "xenia/ui/vulkan/vulkan_util.h"
DECLARE_bool(gpu_allow_invalid_upload_range);
DEFINE_bool(vulkan_sparse_shared_memory, true,
"Enable sparse binding for shared memory emulation. Disabling it "
"increases video memory usage - a 512 MB buffer is created - but "
@@ -405,6 +407,30 @@ bool VulkanSharedMemory::UploadRanges(
uint32_t upload_range_length = upload_page_ranges[i].second;
trace_writer_.WriteMemoryRead(upload_range_start << page_size_log2(),
upload_range_length << page_size_log2());
if (upload_range_length > 0 && !cvars::gpu_allow_invalid_upload_range) {
const uint32_t range_start_addr = upload_range_start << page_size_log2();
const uint32_t upload_range_last_page =
upload_range_start + upload_range_length - 1;
const uint32_t range_end_addr = upload_range_last_page
<< page_size_log2();
const memory::PageAccess start_access =
memory().GetPhysicalHeap()->QueryRangeAccess(range_start_addr,
range_start_addr);
const memory::PageAccess end_access =
memory().GetPhysicalHeap()->QueryRangeAccess(range_end_addr,
range_end_addr);
if (start_access == xe::memory::PageAccess::kNoAccess ||
end_access == xe::memory::PageAccess::kNoAccess) {
XELOGE(
"Vulkan shared memory: Invalid upload range {:08X} length {:08X}",
upload_range_start, upload_range_length);
successful = false;
break;
}
}
while (upload_range_length) {
VkBuffer upload_buffer;
VkDeviceSize upload_buffer_offset, upload_buffer_size;