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https://github.com/RGBCube/serenity
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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
76 lines
1.9 KiB
C++
76 lines
1.9 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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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$yield()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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Thread::current()->yield_and_release_relock_big_lock();
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return 0;
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}
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KResultOr<FlatPtr> Process::sys$sched_setparam(int pid, Userspace<const struct sched_param*> user_param)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(proc);
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struct sched_param desired_param;
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if (!copy_from_user(&desired_param, user_param))
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return EFAULT;
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if (desired_param.sched_priority < THREAD_PRIORITY_MIN || desired_param.sched_priority > THREAD_PRIORITY_MAX)
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return EINVAL;
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auto* peer = Thread::current();
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ScopedSpinLock lock(g_scheduler_lock);
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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() && euid() != peer->process().uid() && uid() != peer->process().uid())
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return EPERM;
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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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KResultOr<FlatPtr> Process::sys$sched_getparam(pid_t pid, Userspace<struct sched_param*> user_param)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(proc);
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int priority;
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{
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auto* peer = Thread::current();
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ScopedSpinLock lock(g_scheduler_lock);
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if (pid != 0) {
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// FIXME: PID/TID BUG
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// The entire process is supposed to be affected.
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peer = Thread::from_tid(pid);
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}
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if (!peer)
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return ESRCH;
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if (!is_superuser() && euid() != peer->process().uid() && uid() != peer->process().uid())
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return EPERM;
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priority = (int)peer->priority();
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}
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struct sched_param param {
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priority
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};
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if (!copy_to_user(user_param, ¶m))
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return EFAULT;
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return 0;
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}
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}
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