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Kernel: Enable SMAP protection on IRQ and exception entry

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It would be nice to do this in the assembly code, but we have to check
if the feature is available before doing a CLAC, so I've put this in
the C++ code for now.
This commit is contained in:
Andreas Kling 2020-01-08 07:27:37 +01:00
parent fe9680f0a4
commit 372f9e9a11
Notes: sideshowbarker 2024-07-19 10:16:53 +09:00
2 changed files with 6 additions and 0 deletions
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5
Kernel/Arch/i386/CPU.cpp
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@ -189,18 +189,21 @@ void handle_crash(RegisterDump& regs, const char* description, int signal)
EH_ENTRY_NO_CODE(6, illegal_instruction);
void illegal_instruction_handler(RegisterDump regs)
{
clac();
handle_crash(regs, "Illegal instruction", SIGILL);
}
EH_ENTRY_NO_CODE(0, divide_error);
void divide_error_handler(RegisterDump regs)
{
clac();
handle_crash(regs, "Divide error", SIGFPE);
}
EH_ENTRY(13, general_protection_fault);
void general_protection_fault_handler(RegisterDump regs)
{
clac();
handle_crash(regs, "General protection fault", SIGSEGV);
}
@ -217,6 +220,7 @@ void fpu_exception_handler(RegisterDump)
EH_ENTRY(14, page_fault);
void page_fault_handler(RegisterDump regs)
{
clac();
ASSERT(current);
u32 fault_address;
@ -491,6 +495,7 @@ void load_task_register(u16 selector)
void handle_irq(RegisterDump regs)
{
clac();
ASSERT(regs.isr_number >= 0x50 && regs.isr_number <= 0x5f);
u8 irq = (u8)(regs.isr_number - 0x50);
if (s_irq_handler[irq])

1
Kernel/Arch/i386/PIT.cpp
View file

@ -38,6 +38,7 @@ static u32 s_seconds_since_boot;
void timer_interrupt_handler(RegisterDump regs)
{
clac();
IRQHandlerScope scope(IRQ_TIMER);
if (++s_ticks_this_second >= TICKS_PER_SECOND) {
// FIXME: Synchronize with the RTC somehow to prevent drifting apart.