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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
4 changed files with 19 additions and 2 deletions
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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;