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Minor changes to stack guard

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This commit is contained in:
Adrien Bourmault 2020-01-07 16:56:46 +01:00
parent f882e16db7
commit 74d0508b67
3 changed files with 18 additions and 18 deletions
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16
kaleid/kernel/ke/idt.c
View File

@ -341,20 +341,6 @@ static void EarlyExceptionHandler(ISRFrame_t *regs)
// //
static void DoubleFaultHandler(ISRFrame_t *regs) static void DoubleFaultHandler(ISRFrame_t *regs)
{ {
ulong StackGuardTwo = (ulong)MmGetStackGuards(1);
if (regs->rsp <= StackGuardTwo + 4*KB && (regs->rsp - 4*KB <= regs->cr2)) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Overflow\n\n"
" Double Fault Error code : %#x (%b)\n"
" Stack Guard bypassed : %#x",
VGA_COLOR_LIGHT_RED,
regs->ErrorCode,
regs->ErrorCode,
StackGuardTwo
);
} else {
bprintf(BStdOut, bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Double Fault Abort\n\n" "\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Double Fault Abort\n\n"
" Error code : 0x%x (%b)", " Error code : 0x%x (%b)",
@ -364,8 +350,6 @@ static void DoubleFaultHandler(ISRFrame_t *regs)
regs->ErrorCode regs->ErrorCode
); );
}
KeBrkDumpRegisters(regs); KeBrkDumpRegisters(regs);
BStdOut->flusher(BStdOut); BStdOut->flusher(BStdOut);

4
kaleid/kernel/mm/gdt.c
View File

@ -45,6 +45,10 @@ void MmInitGdt(void)
gdt[1].access = 0x98; gdt[1].access = 0x98;
gdt[1].flags = 0x20; gdt[1].flags = 0x20;
gdt[2].lowLimit = 0xFFFF;
gdt[2].access = 0x98;
gdt[2].flags = 0x20;
tssDesc.access = 0x89; tssDesc.access = 0x89;
tssDesc.flags = 0x40; tssDesc.flags = 0x40;
tssDesc.lowBase = (ulong)&tss & 0xFFFF; tssDesc.lowBase = (ulong)&tss & 0xFFFF;

14
kaleid/kernel/mm/paging.c
View File

@ -142,7 +142,8 @@ void *MmTranslateKPageToAddr(void *rank)
static void PagingHandler(ISRFrame_t *regs) static void PagingHandler(ISRFrame_t *regs)
{ {
ulong StackGuardOne = (ulong)MmGetStackGuards(0); ulong StackGuardOne = (ulong)MmGetStackGuards(0);
if (regs->cr2 >= StackGuardOne && (regs->rsp + 4*KB >= regs->cr2)) { ulong StackGuardTwo = (ulong)MmGetStackGuards(1);
if ((regs->cr2 >= StackGuardOne) && (regs->cr2 <= StackGuardOne + 4*KB) && (regs->rsp <= regs->cr2)) {
bprintf(BStdOut, bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Underflow\n\n" "\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Underflow\n\n"
" Double Fault Error code : %#x (%b)\n" " Double Fault Error code : %#x (%b)\n"
@ -153,6 +154,17 @@ static void PagingHandler(ISRFrame_t *regs)
regs->ErrorCode, regs->ErrorCode,
StackGuardOne StackGuardOne
); );
} else if ((regs->cr2 >= StackGuardTwo) && (regs->cr2 <= StackGuardTwo + 4*KB) && (regs->rsp >= regs->cr2)) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Overflow\n\n"
" Double Fault Error code : %#x (%b)\n"
" Stack Guard bypassed : %#x",
VGA_COLOR_LIGHT_RED,
regs->ErrorCode,
regs->ErrorCode,
StackGuardTwo
);
} else { } else {
//XXX page fault //XXX page fault
bprintf(BStdOut, "\n\n%CPANIC\n[ISR 0x%x] Irrecoverable Kernel Page Fault at %p\n\n" bprintf(BStdOut, "\n\n%CPANIC\n[ISR 0x%x] Irrecoverable Kernel Page Fault at %p\n\n"