mirror of
https://github.com/RGBCube/serenity
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f86b671de2
Move away from using the group ID/user ID helpers in the process to allow for us to take advantage of the immutable credentials instead.
79 lines
2.2 KiB
C++
79 lines
2.2 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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#include <Kernel/Scheduler.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$yield()
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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Thread::current()->yield_without_releasing_big_lock();
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$sched_setparam(int pid, Userspace<const struct sched_param*> user_param)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(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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auto credentials = this->credentials();
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auto peer_credentials = peer->process().credentials();
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if (!credentials->is_superuser() && credentials->euid() != peer_credentials->uid() && credentials->uid() != peer_credentials->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_NO_PROCESS_BIG_LOCK(this);
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TRY(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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auto credentials = this->credentials();
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auto peer_credentials = peer->process().credentials();
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if (!credentials->is_superuser() && credentials->euid() != peer_credentials->uid() && credentials->uid() != peer_credentials->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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