mirror of
https://github.com/RGBCube/serenity
synced 2025-05-30 21:48:11 +00:00
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.
74 lines
1.8 KiB
C++
74 lines
1.8 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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ErrorOr<FlatPtr> Process::sys$yield()
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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require_promise(Pledge::stdio);
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Thread::current()->yield_without_releasing_big_lock();
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$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(Pledge::proc);
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auto param = TRY(copy_typed_from_user(user_param));
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if (param.sched_priority < THREAD_PRIORITY_MIN || param.sched_priority > THREAD_PRIORITY_MAX)
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return EINVAL;
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auto* peer = Thread::current();
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SpinlockLocker 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)param.sched_priority);
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return 0;
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}
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ErrorOr<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(Pledge::proc);
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int priority;
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{
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auto* peer = Thread::current();
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SpinlockLocker 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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TRY(copy_to_user(user_param, ¶m));
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return 0;
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}
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}
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