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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Library/UserOrKernelBuffer.h>
#include <Kernel/Security/Random.h>
#include <Kernel/Tasks/Process.h>
namespace Kernel {
// We don't use the flag yet, but we could use it for distinguishing
// random source like Linux, unlike the OpenBSD equivalent. However, if we
// do, we should be able of the caveats that Linux has dealt with.
ErrorOr<FlatPtr> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::stdio));
if (buffer_size > NumericLimits<ssize_t>::max())
return EINVAL;
auto data_buffer = TRY(UserOrKernelBuffer::for_user_buffer(buffer, buffer_size));
return TRY(data_buffer.write_buffered<1024>(buffer_size, [&](Bytes bytes) {
get_good_random_bytes(bytes);
return bytes.size();
}));
}
}
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