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Save/Restore shadow GS too while scheduling tasks

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This commit is contained in:
Alex 2023-05-04 22:39:37 +03:00
parent 7abbc51d99
commit 533b945e84
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
4 changed files with 19 additions and 2 deletions
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15
SystemCalls/Native.cpp
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@ -372,9 +372,22 @@ static int sys_fork(SyscallsFrame *Frame)
strncpy(NewThread->Name, Thread->Name, sizeof(Thread->Name));
NewThread->Info = Thread->Info;
NewThread->ShadowGSBase = Thread->ShadowGSBase;
NewThread->GSBase = Thread->GSBase;
NewThread->FSBase = Thread->FSBase;
TaskManager->Sleep(10); /* Re-schedule */
CriticalSection cs;
static int RetChild = 0;
#if defined(a86)
asmv("int $0x30"); /* This will trigger the IRQ16 instantly so we won't execute the next instruction */
#elif defined(aa64)
asmv("svc #0x30"); /* This will trigger the IRQ16 instantly so we won't execute the next instruction */
#endif
if (RetChild--)
return 0;
RetChild = 1;
NewThread->Registers = Thread->Registers;
debug("Forked thread \"%s\"(%d) from process \"%s\"(%d)", NewThread->Name, NewThread->ID, NewProcess->Name, NewProcess->ID);

2
Tasking/Scheduler.cpp
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@ -522,6 +522,7 @@ namespace Tasking
{
CurrentCPU->CurrentThread->Registers = *Frame;
CPU::x64::fxsave(CurrentCPU->CurrentThread->FPU);
CurrentCPU->CurrentThread->ShadowGSBase = CPU::x64::rdmsr(CPU::x64::MSR_SHADOW_GS_BASE);
CurrentCPU->CurrentThread->GSBase = CPU::x64::rdmsr(CPU::x64::MSR_GS_BASE);
CurrentCPU->CurrentThread->FSBase = CPU::x64::rdmsr(CPU::x64::MSR_FS_BASE);
@ -604,6 +605,7 @@ namespace Tasking
asmv("movq %cr3, %rax");
asmv("movq %rax, %cr3");
CPU::x64::fxrstor(CurrentCPU->CurrentThread->FPU);
CPU::x64::wrmsr(CPU::x64::MSR_SHADOW_GS_BASE, CurrentCPU->CurrentThread->ShadowGSBase);
CPU::x64::wrmsr(CPU::x64::MSR_GS_BASE, CurrentCPU->CurrentThread->GSBase);
CPU::x64::wrmsr(CPU::x64::MSR_FS_BASE, CurrentCPU->CurrentThread->FSBase);

2
Tasking/Task.cpp
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@ -429,6 +429,7 @@ namespace Tasking
Thread->Stack = new Memory::StackGuard(false, Parent->PageTable);
#if defined(a64)
SecurityManager.TrustToken(Thread->Security.UniqueToken, TTL::TrustedByKernel);
Thread->ShadowGSBase = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_SHADOW_GS_BASE);
Thread->GSBase = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_GS_BASE);
Thread->FSBase = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_FS_BASE);
Thread->Registers.cs = GDT_KERNEL_CODE;
@ -448,6 +449,7 @@ namespace Tasking
Thread->Stack = new Memory::StackGuard(true, Parent->PageTable);
#if defined(a64)
SecurityManager.TrustToken(Thread->Security.UniqueToken, TTL::Untrusted);
Thread->ShadowGSBase = CPU::x64::rdmsr(CPU::x64::MSRID::MSR_SHADOW_GS_BASE);
Thread->GSBase = 0;
Thread->FSBase = 0;
Thread->Registers.cs = GDT_USER_CODE;

2
include/task.hpp
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@ -120,7 +120,7 @@ namespace Tasking
TaskStatus Status;
#if defined(a64)
CPU::x64::TrapFrame Registers;
uint64_t GSBase, FSBase;
uint64_t ShadowGSBase, GSBase, FSBase;
#elif defined(a32)
CPU::x32::TrapFrame Registers; // TODO
uint64_t GSBase, FSBase;