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UserspaceEmulator: Honor the read/write/execute bits in mmap regions

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UE will now correctly crash when accessing an mmap memory region in
some way it's not supposed to be accessed.
This commit is contained in:
Andreas Kling 2020-11-14 15:13:50 +01:00
parent ef9ac8a8a2
commit d4509647d8
5 changed files with 72 additions and 5 deletions
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12
DevTools/UserspaceEmulator/Emulator.cpp
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@ -920,9 +920,17 @@ u32 Emulator::virt$unveil(u32)
return 0;
}
u32 Emulator::virt$mprotect(FlatPtr, size_t, int)
u32 Emulator::virt$mprotect(FlatPtr base, size_t size, int prot)
{
return 0;
if (auto* region = mmu().find_region({ m_cpu.ds(), base })) {
if (!region->is_mmap())
return -EINVAL;
ASSERT(region->size() == size);
auto& mmap_region = *(MmapRegion*)region;
mmap_region.set_prot(prot);
return 0;
}
return -EINVAL;
}
u32 Emulator::virt$madvise(FlatPtr, size_t, int)