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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Process.h>
namespace Kernel {
KResult Process::do_kill(Process& process, int signal)
{
// FIXME: Allow sending SIGCONT to everyone in the process group.
// FIXME: Should setuid processes have some special treatment here?
if (!is_superuser() && m_euid != process.m_uid && m_uid != process.m_uid)
return KResult(-EPERM);
if (process.is_ring0() && signal == SIGKILL) {
klog() << "attempted to send SIGKILL to ring 0 process " << process.name().characters() << "(" << process.pid() << ")";
return KResult(-EPERM);
}
if (signal != 0)
return process.send_signal(signal, this);
return KSuccess;
}
KResult Process::do_killpg(pid_t pgrp, int signal)
{
InterruptDisabler disabler;
ASSERT(pgrp >= 0);
// Send the signal to all processes in the given group.
if (pgrp == 0) {
// Send the signal to our own pgrp.
pgrp = pgid();
}
bool group_was_empty = true;
bool any_succeeded = false;
KResult error = KSuccess;
Process::for_each_in_pgrp(pgrp, [&](auto& process) {
group_was_empty = false;
KResult res = do_kill(process, signal);
if (res.is_success())
any_succeeded = true;
else
error = res;
return IterationDecision::Continue;
});
if (group_was_empty)
return KResult(-ESRCH);
if (any_succeeded)
return KSuccess;
return error;
}
KResult Process::do_killall(int signal)
{
InterruptDisabler disabler;
bool any_succeeded = false;
KResult error = KSuccess;
// Send the signal to all processes we have access to for.
ScopedSpinLock lock(g_processes_lock);
for (auto& process : *g_processes) {
KResult res = KSuccess;
if (process.pid() == m_pid)
res = do_killself(signal);
else
res = do_kill(process, signal);
if (res.is_success())
any_succeeded = true;
else
error = res;
}
if (any_succeeded)
return KSuccess;
return error;
}
KResult Process::do_killself(int signal)
{
if (signal == 0)
return KSuccess;
auto current_thread = Thread::current();
if (!current_thread->should_ignore_signal(signal)) {
current_thread->send_signal(signal, this);
(void)current_thread->block<Thread::SemiPermanentBlocker>(Thread::SemiPermanentBlocker::Reason::Signal);
}
return KSuccess;
}
int Process::sys$kill(pid_t pid, int signal)
{
if (pid == m_pid)
REQUIRE_PROMISE(stdio);
else
REQUIRE_PROMISE(proc);
if (signal < 0 || signal >= 32)
return -EINVAL;
if (pid < -1) {
if (pid == NumericLimits<i32>::min())
return -EINVAL;
return do_killpg(-pid, signal);
}
if (pid == -1)
return do_killall(signal);
if (pid == m_pid) {
return do_killself(signal);
}
ScopedSpinLock lock(g_processes_lock);
auto* peer = Process::from_pid(pid);
if (!peer)
return -ESRCH;
return do_kill(*peer, signal);
}
int Process::sys$killpg(int pgrp, int signum)
{
REQUIRE_PROMISE(proc);
if (signum < 1 || signum >= 32)
return -EINVAL;
if (pgrp < 0)
return -EINVAL;
return do_killpg(pgrp, signum);
}
}
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