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Fix classic alignment mistake

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momo5502
2024-08-31 16:40:55 +02:00
parent 9427520390
commit e36ed03720
1 changed files with 11 additions and 5 deletions
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16
src/windows_emulator/syscalls.cpp
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@@ -770,16 +770,22 @@ namespace
return STATUS_NOT_SUPPORTED;
}
const auto address = page_align_down(base_address.read());
base_address.write(address);
const auto orig_start = base_address.read();
const auto orig_length = bytes_to_protect.read();
const auto size = page_align_up(bytes_to_protect.read());
bytes_to_protect.write(static_cast<uint32_t>(size));
const auto aligned_start = page_align_down(orig_start);
const auto aligned_length = page_align_up(orig_start + orig_length) - aligned_start;
base_address.write(aligned_start);
bytes_to_protect.write(static_cast<uint32_t>(aligned_length));
const auto requested_protection = map_nt_to_emulator_protection(protection);
printf("Changing protection at %llX-%llX to %s\n", aligned_start, aligned_start + aligned_length,
get_permission_string(requested_protection).c_str());
memory_permission old_protection_value{};
c.emu.protect_memory(address, size, requested_protection, &old_protection_value);
c.emu.protect_memory(aligned_start, aligned_length, requested_protection, &old_protection_value);
const auto current_protection = map_emulator_to_nt_protection(old_protection_value);
old_protection.write(current_protection);