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Scheduler: Use copy_to_user in a few system calls

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This commit is contained in:
apio 2022-11-09 15:20:53 +01:00
parent 46e4d37098
commit ea94b331fb
1 changed files with 23 additions and 64 deletions
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87
kernel/src/thread/Scheduler.cpp
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@ -492,23 +492,11 @@ void sys_waitpid(Context* context, long pid, int* wstatus,
context->rax = 0; // No child has exited, let's return 0.
return;
}
int* kwstatus;
if (wstatus)
{
kwstatus = obtain_user_ref(wstatus);
if (!kwstatus)
{
context->rax = -EFAULT;
return;
}
}
kdbgln("blocking wait on any child");
sched_current_task->state = sched_current_task->Blocking;
sched_current_task->block_reason = BlockReason::Waiting;
sched_current_task->blocking_wait_info.pid = -1;
if (wstatus) sched_current_task->blocking_wait_info.wstatus = kwstatus;
else
sched_current_task->blocking_wait_info.wstatus = nullptr;
sched_current_task->blocking_wait_info.wstatus = wstatus;
return Scheduler::task_yield(context);
}
}
@ -534,42 +522,19 @@ void sys_waitpid(Context* context, long pid, int* wstatus,
context->rax = 0; // No child has exited, let's return 0.
return;
}
int* kwstatus;
if (wstatus)
{
kwstatus = obtain_user_ref(wstatus);
if (!kwstatus)
{
context->rax = -EFAULT;
return;
}
}
sched_current_task->state = sched_current_task->Blocking;
sched_current_task->block_reason = BlockReason::Waiting;
sched_current_task->blocking_wait_info.pid = pid;
if (wstatus) sched_current_task->blocking_wait_info.wstatus = kwstatus;
else
sched_current_task->blocking_wait_info.wstatus = nullptr;
sched_current_task->blocking_wait_info.wstatus = wstatus;
return Scheduler::task_yield(context);
}
if (wstatus)
{
int* kwstatus = obtain_user_ref(wstatus);
if (kwstatus)
{
*kwstatus = (int)(child->exit_status & 0xff);
release_user_ref(kwstatus);
}
else
{
kinfoln("wstatus ptr is invalid: %p", (void*)wstatus);
child->state = child->Exited;
context->rax = -EFAULT;
return;
}
}
child->state = child->Exited;
context->rax = (long)child->id;
if (wstatus)
{
int status = (int)(child->exit_status & 0xff);
if (!copy_to_user(wstatus, &status, sizeof(int))) context->rax = -EFAULT;
}
}
bool Task::is_wait_still_blocking()
@ -610,14 +575,14 @@ void Task::resume_wait()
Task* child = Scheduler::find_by_pid(blocking_wait_info.pid);
ensure(child); // This should also already have been validated.
if (blocking_wait_info.wstatus)
{
*blocking_wait_info.wstatus = (int)(child->exit_status & 0xff);
release_user_ref(blocking_wait_info.wstatus);
}
child->state = child->Exited;
regs.rax = (long)child->id;
if (blocking_wait_info.wstatus)
{
int wstatus = (int)(child->exit_status & 0xff);
if (!copy_to_user(blocking_wait_info.wstatus, &wstatus, sizeof(int))) regs.rax = -EFAULT;
}
}
struct pstat
@ -649,23 +614,17 @@ void sys_pstat(Context* context, long pid, struct pstat* buf)
context->rax = -ESRCH;
return;
}
context->rax = task->id;
if (buf)
{
struct pstat* kpstat = obtain_user_ref(buf);
if (!kpstat)
{
context->rax = -EFAULT;
return;
}
kpstat->pt_pid = task->id;
kpstat->pt_ppid = task->ppid;
kpstat->pt_state = (int)task->state;
kpstat->pt_time = (long)task->cpu_time;
kpstat->pt_uid = task->uid;
kpstat->pt_gid = task->gid;
strlcpy(kpstat->pt_name, task->name, sizeof(kpstat->pt_name));
release_user_ref(kpstat);
struct pstat stat;
stat.pt_pid = task->id;
stat.pt_ppid = task->ppid;
stat.pt_state = (int)task->state;
stat.pt_time = (long)task->cpu_time;
stat.pt_uid = task->uid;
stat.pt_gid = task->gid;
strlcpy(stat.pt_name, task->name, sizeof(stat.pt_name));
if (!copy_to_user(buf, &stat, sizeof(struct pstat))) context->rax = -EFAULT;
}
context->rax = task->id;
return;
}