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Kernel/LibC: Implement sched_* functionality to set/get process priority

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Right now, we allow anything inside a user to raise or lower any other process's
priority. This feels simple enough to me. Linux disallows raising, but
that's annoying in practice.
This commit is contained in:
Robin Burchell 2019-05-29 23:20:51 +02:00 • committed by Andreas Kling
parent b160677e9e
commit 9cd0f6ffac
8 changed files with 103 additions and 1 deletions
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43
Kernel/Process.cpp
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@ -2282,6 +2282,49 @@ int Process::sys$getpeername(int sockfd, sockaddr* addr, socklen_t* addrlen)
return 0;
}
int Process::sys$sched_setparam(pid_t pid, const struct sched_param* param)
{
if (!validate_read_typed(param))
return -EFAULT;
InterruptDisabler disabler;
auto* peer = this;
if (pid != 0)
peer = Process::from_pid(pid);
if (!peer)
return -ESRCH;
if (!is_superuser() && m_euid != peer->m_uid && m_uid != peer->m_uid)
return -EPERM;
if (param->sched_priority < Process::FirstPriority || param->sched_priority > Process::LastPriority)
return -EINVAL;
peer->set_priority(Priority(param->sched_priority));
return 0;
}
int Process::sys$sched_getparam(pid_t pid, struct sched_param* param)
{
if (!validate_read_typed(param))
return -EFAULT;
InterruptDisabler disabler;
auto* peer = this;
if (pid != 0)
peer = Process::from_pid(pid);
if (!peer)
return -ESRCH;
if (!is_superuser() && m_euid != peer->m_uid && m_uid != peer->m_uid)
return -EPERM;
param->sched_priority = peer->priority();
return 0;
}
int Process::sys$getsockopt(const Syscall::SC_getsockopt_params* params)
{
if (!validate_read_typed(params))