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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
33 lines
1,014 B
C++
33 lines
1,014 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Random.h>
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#include <Kernel/UserOrKernelBuffer.h>
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namespace Kernel {
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// We don't use the flag yet, but we could use it for distinguishing
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// random source like Linux, unlike the OpenBSD equivalent. However, if we
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// do, we should be able of the caveats that Linux has dealt with.
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ErrorOr<FlatPtr> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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REQUIRE_PROMISE(stdio);
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if (buffer_size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto data_buffer = UserOrKernelBuffer::for_user_buffer(buffer, buffer_size);
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if (!data_buffer.has_value())
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return EFAULT;
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return TRY(data_buffer.value().write_buffered<1024>(buffer_size, [&](Bytes bytes) {
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get_good_random_bytes(bytes);
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return bytes.size();
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}));
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}
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}
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