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linux: Implement vfork() syscall

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This commit is contained in:
EnderIce2 2024-10-20 03:02:09 +03:00
parent 0edd84c8a8
commit 8b442d14e3
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 109 additions and 10 deletions
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119
syscalls/linux.cpp
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@ -1495,8 +1495,89 @@ static pid_t linux_fork(SysFrm *sf)
static pid_t linux_vfork(SysFrm *sf)
{
stub;
return -linux_ENOSYS;
TCB *Thread = thisThread;
PCB *Parent = Thread->Parent;
PCB *NewProcess =
TaskManager->CreateProcess(Parent, Parent->Name,
Parent->Security.ExecutionMode,
true);
if (unlikely(!NewProcess))
{
error("Failed to create process for vfork");
return -linux_EAGAIN;
}
NewProcess->Security.ProcessGroupID = Parent->Security.ProcessGroupID;
NewProcess->Security.SessionID = Parent->Security.SessionID;
NewProcess->PageTable = Parent->PageTable;
delete NewProcess->vma;
NewProcess->vma = Parent->vma;
delete NewProcess->ProgramBreak;
NewProcess->ProgramBreak = NewProcess->ProgramBreak;
NewProcess->FileDescriptors->Fork(Parent->FileDescriptors);
NewProcess->Executable = Parent->Executable;
NewProcess->CWD = Parent->CWD;
NewProcess->FileCreationMask = Parent->FileCreationMask;
TCB *NewThread =
TaskManager->CreateThread(NewProcess,
0,
nullptr,
nullptr,
std::vector<AuxiliaryVector>(),
Thread->Info.Architecture,
Thread->Info.Compatibility,
true);
if (!NewThread)
{
error("Failed to create thread for fork");
delete NewProcess;
return -linux_EAGAIN;
}
NewThread->Rename(Thread->Name);
TaskManager->UpdateFrame();
NewThread->FPU = Thread->FPU;
delete NewThread->Stack;
NewThread->Stack = Thread->Stack;
NewThread->Info.Architecture = Thread->Info.Architecture;
NewThread->Info.Compatibility = Thread->Info.Compatibility;
NewThread->Security.IsCritical = Thread->Security.IsCritical;
NewThread->Registers = Thread->Registers;
#if defined(a64)
NewThread->Registers.rip = (uintptr_t)__LinuxForkReturn;
/* For sysretq */
NewThread->Registers.rdi = (uintptr_t)NewProcess->PageTable;
NewThread->Registers.rcx = sf->ReturnAddress;
NewThread->Registers.r8 = sf->StackPointer;
#else
#warning "sys_fork not implemented for other platforms"
#endif
#ifdef a86
NewThread->GSBase = NewThread->ShadowGSBase;
NewThread->ShadowGSBase = Thread->ShadowGSBase;
NewThread->FSBase = Thread->FSBase;
#endif
debug("ret addr: %#lx, stack: %#lx ip: %#lx", sf->ReturnAddress,
sf->StackPointer, (uintptr_t)__LinuxForkReturn);
debug("Forked thread \"%s\"(%d) to \"%s\"(%d)",
Thread->Name, Thread->ID,
NewThread->Name, NewThread->ID);
{
CriticalSection cs;
Thread->SetState(Tasking::Frozen);
NewProcess->Linux.vforked = true;
NewProcess->Linux.CallingThread = Thread;
NewThread->SetState(Tasking::Ready);
}
Parent->GetContext()->Yield();
return (int)NewProcess->ID;
}
__no_sanitize("undefined") static int linux_execve(SysFrm *sf, const char *pathname,
@ -1505,7 +1586,8 @@ __no_sanitize("undefined") static int linux_execve(SysFrm *sf, const char *pathn
{
/* FIXME: exec doesn't follow the UNIX standard
The pid, open files, etc. should be preserved */
PCB *pcb = thisProcess;
TCB *tcb = thisThread;
PCB *pcb = tcb->Parent;
Memory::VirtualMemoryArea *vma = pcb->vma;
auto pPathname = vma->UserCheckAndGetAddress(pathname, PAGE_SIZE);
@ -1651,6 +1733,19 @@ __no_sanitize("undefined") static int linux_execve(SysFrm *sf, const char *pathn
(char *const *)safeEnvp));
}
if (pcb->Linux.vforked)
{
CriticalSection cs;
pcb->Linux.CallingThread->SetState(Tasking::Ready);
pcb->Linux.vforked = false;
pcb->PageTable = KernelPageTable->Fork();
pcb->vma = new Memory::VirtualMemoryArea(pcb->PageTable);
pcb->ProgramBreak = new Memory::ProgramBreak(pcb->PageTable, pcb->vma);
// tcb->Stack = new Memory::StackGuard(true, pcb->vma);
}
int ret = Execute::Spawn((char *)pPathname,
(const char **)safeArgv,
(const char **)safeEnvp,
@ -1682,14 +1777,18 @@ __no_sanitize("undefined") static int linux_execve(SysFrm *sf, const char *pathn
static __noreturn void linux_exit(SysFrm *, int status)
{
TCB *t = thisThread;
{
CriticalSection cs;
trace("Userspace thread %s(%d) exited with code %d (%#x)",
t->Name,
t->ID, status,
status < 0 ? -status : status);
trace("Userspace thread %s(%d) exited with code %d (%#x)",
t->Name,
t->ID, status,
status < 0 ? -status : status);
t->SetState(Tasking::Zombie);
t->SetExitCode(status);
t->SetState(Tasking::Zombie);
t->SetExitCode(status);
if (t->Parent->Linux.vforked)
t->Parent->Linux.CallingThread->SetState(Tasking::Ready);
}
while (true)
t->GetContext()->Yield();
__builtin_unreachable();