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538b985487
By making the Process class RefCounted we don't really need ProcessInspectionHandle anymore. This also fixes some race conditions where a Process may be deleted while still being used by ProcFS. Also make sure to acquire the Process' lock when accessing regions. Last but not least, there's no reason why a thread can't be scheduled while being inspected, though in practice it won't happen anyway because the scheduler lock is held at the same time.
133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$yield()
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{
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REQUIRE_PROMISE(stdio);
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Thread::current()->yield_without_holding_big_lock();
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return 0;
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}
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int Process::sys$donate(int tid)
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{
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REQUIRE_PROMISE(stdio);
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if (tid < 0)
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return -EINVAL;
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InterruptDisabler disabler;
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auto* thread = Thread::from_tid(tid);
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if (!thread || thread->pid() != pid())
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return -ESRCH;
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Scheduler::donate_to(thread, "sys$donate");
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return 0;
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}
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int Process::sys$sched_setparam(int tid, Userspace<const struct sched_param*> user_param)
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{
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REQUIRE_PROMISE(proc);
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if (!validate_read_typed(user_param))
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return -EFAULT;
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struct sched_param desired_param;
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copy_from_user(&desired_param, user_param);
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InterruptDisabler disabler;
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auto* peer = Thread::current();
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if (tid != 0)
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peer = Thread::from_tid(tid);
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if (!peer)
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return -ESRCH;
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if (!is_superuser() && m_euid != peer->process().m_uid && m_uid != peer->process().m_uid)
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return -EPERM;
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if (desired_param.sched_priority < THREAD_PRIORITY_MIN ||
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desired_param.sched_priority > THREAD_PRIORITY_MAX)
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return -EINVAL;
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peer->set_priority((u32)desired_param.sched_priority);
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return 0;
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}
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int Process::sys$sched_getparam(pid_t pid, struct sched_param* param)
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{
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REQUIRE_PROMISE(proc);
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if (!validate_write_typed(param))
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return -EFAULT;
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InterruptDisabler disabler;
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auto* peer = Thread::current();
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if (pid != 0)
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peer = Thread::from_tid(pid);
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if (!peer)
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return -ESRCH;
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if (!is_superuser() && m_euid != peer->process().m_uid && m_uid != peer->process().m_uid)
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return -EPERM;
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int priority = peer->priority();
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copy_to_user(¶m->sched_priority, &priority);
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return 0;
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}
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int Process::sys$set_thread_boost(int tid, int amount)
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{
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REQUIRE_PROMISE(proc);
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if (amount < 0 || amount > 20)
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return -EINVAL;
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InterruptDisabler disabler;
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auto* thread = Thread::from_tid(tid);
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if (!thread)
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return -ESRCH;
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if (thread->state() == Thread::State::Dead || thread->state() == Thread::State::Dying)
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return -ESRCH;
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if (!is_superuser() && thread->process().uid() != euid())
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return -EPERM;
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thread->set_priority_boost(amount);
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return 0;
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}
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int Process::sys$set_process_boost(pid_t pid, int amount)
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{
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REQUIRE_PROMISE(proc);
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if (amount < 0 || amount > 20)
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return -EINVAL;
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ScopedSpinLock lock(g_processes_lock);
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auto process = Process::from_pid(pid);
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if (!process || process->is_dead())
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return -ESRCH;
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if (!is_superuser() && process->uid() != euid())
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return -EPERM;
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process->m_priority_boost = amount;
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return 0;
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}
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}
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