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48325e2959
This syscall doesn't touch any intra-process shared resources and already holds the global kernel RNG lock so there's no reason to hold the big lock.
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
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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KResultOr<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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auto result = data_buffer.value().write_buffered<1024>(buffer_size, [&](u8* buffer, size_t buffer_bytes) {
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get_good_random_bytes(buffer, buffer_bytes);
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return buffer_bytes;
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});
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if (result.is_error())
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return result.error();
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else
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return result.release_value();
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}
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}
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