mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-04 05:20:30 +00:00
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Process.h>
|
|
#include <Kernel/Random.h>
|
|
#include <Kernel/UserOrKernelBuffer.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.
|
|
KResultOr<FlatPtr> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
REQUIRE_PROMISE(stdio);
|
|
if (buffer_size > NumericLimits<ssize_t>::max())
|
|
return EINVAL;
|
|
|
|
auto data_buffer = UserOrKernelBuffer::for_user_buffer(buffer, buffer_size);
|
|
if (!data_buffer.has_value())
|
|
return EFAULT;
|
|
auto result = data_buffer.value().write_buffered<1024>(buffer_size, [&](u8* buffer, size_t buffer_bytes) {
|
|
get_good_random_bytes({ buffer, buffer_bytes });
|
|
return buffer_bytes;
|
|
});
|
|
if (result.is_error())
|
|
return result.error();
|
|
else
|
|
return result.release_value();
|
|
}
|
|
|
|
}
|