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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
120 lines
3.5 KiB
C++
120 lines
3.5 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 <AK/Time.h>
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#include <Kernel/Process.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$map_time_page()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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require_promise(Pledge::stdio);
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auto& vmobject = TimeManagement::the().time_page_vmobject();
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auto range = TRY(address_space().page_directory().range_allocator().try_allocate_randomized(PAGE_SIZE, PAGE_SIZE));
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auto* region = TRY(address_space().allocate_region_with_vmobject(range, vmobject, 0, "Kernel time page"sv, PROT_READ, true));
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return region->vaddr().get();
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}
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ErrorOr<FlatPtr> Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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require_promise(Pledge::stdio);
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if (!TimeManagement::is_valid_clock_id(clock_id))
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return EINVAL;
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auto ts = TimeManagement::the().current_time(clock_id).to_timespec();
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TRY(copy_to_user(user_ts, &ts));
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$clock_settime(clockid_t clock_id, Userspace<const timespec*> user_ts)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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require_promise(Pledge::settime);
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if (!is_superuser())
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return EPERM;
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auto time = TRY(copy_time_from_user(user_ts));
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switch (clock_id) {
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case CLOCK_REALTIME:
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TimeManagement::the().set_epoch_time(time);
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break;
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default:
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return EINVAL;
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}
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$clock_nanosleep(Userspace<const Syscall::SC_clock_nanosleep_params*> user_params)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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require_promise(Pledge::stdio);
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auto params = TRY(copy_typed_from_user(user_params));
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auto requested_sleep = TRY(copy_time_from_user(params.requested_sleep));
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bool is_absolute;
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switch (params.flags) {
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case 0:
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is_absolute = false;
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break;
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case TIMER_ABSTIME:
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is_absolute = true;
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break;
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default:
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return EINVAL;
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}
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if (!TimeManagement::is_valid_clock_id(params.clock_id))
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return EINVAL;
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bool was_interrupted;
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if (is_absolute) {
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was_interrupted = Thread::current()->sleep_until(params.clock_id, requested_sleep).was_interrupted();
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} else {
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Time remaining_sleep;
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was_interrupted = Thread::current()->sleep(params.clock_id, requested_sleep, &remaining_sleep).was_interrupted();
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timespec remaining_sleep_ts = remaining_sleep.to_timespec();
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if (was_interrupted && params.remaining_sleep) {
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TRY(copy_to_user(params.remaining_sleep, &remaining_sleep_ts));
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}
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}
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if (was_interrupted)
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return EINTR;
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$adjtime(Userspace<const timeval*> user_delta, Userspace<timeval*> user_old_delta)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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if (user_old_delta) {
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timespec old_delta_ts = TimeManagement::the().remaining_epoch_time_adjustment();
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timeval old_delta;
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timespec_to_timeval(old_delta_ts, old_delta);
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TRY(copy_to_user(user_old_delta, &old_delta));
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}
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if (user_delta) {
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require_promise(Pledge::settime);
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if (!is_superuser())
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return EPERM;
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auto delta = TRY(copy_time_from_user(user_delta));
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// FIXME: Should use AK::Time internally
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TimeManagement::the().set_remaining_epoch_time_adjustment(delta.to_timespec());
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}
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return 0;
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}
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}
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