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Kernel: Figure out why a program is misbehaving

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apio 2022-11-06 18:12:25 +01:00
parent c6ce7a5358
commit 5d94525c7a
3 changed files with 32 additions and 0 deletions
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4
kernel/include/utils/PageFaultReason.h Normal file
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@ -0,0 +1,4 @@
#pragma once
#include <stdint.h>
void determine_user_page_fault_reason(uintptr_t faulting_address);

8
kernel/src/interrupts/Entry.cpp
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@ -5,6 +5,7 @@
#include "interrupts/Interrupts.h" #include "interrupts/Interrupts.h"
#include "io/Serial.h" #include "io/Serial.h"
#include "log/Log.h" #include "log/Log.h"
#include "memory/VMM.h"
#include "misc/hang.h" #include "misc/hang.h"
#include "panic/Panic.h" #include "panic/Panic.h"
#include "std/assert.h" #include "std/assert.h"
@ -12,6 +13,7 @@
#include "sys/Syscall.h" #include "sys/Syscall.h"
#include "thread/Scheduler.h" #include "thread/Scheduler.h"
#include "trace/StackTracer.h" #include "trace/StackTracer.h"
#include "utils/PageFaultReason.h"
extern "C" void common_handler(Context* context) extern "C" void common_handler(Context* context)
{ {
@ -28,6 +30,8 @@ extern "C" void common_handler(Context* context)
if (context->cs == 0x8) { int_panic(context, "GPF in kernel task"); } if (context->cs == 0x8) { int_panic(context, "GPF in kernel task"); }
else else
{ {
VMM::enter_syscall_context();
kerrorln("General protection fault at RIP %lx, cs %ld, ss %ld, RSP %lx, error code %ld", context->rip, kerrorln("General protection fault at RIP %lx, cs %ld, ss %ld, RSP %lx, error code %ld", context->rip,
context->cs, context->ss, context->rsp, context->error_code); context->cs, context->ss, context->rsp, context->error_code);
kinfoln("Stack trace:"); kinfoln("Stack trace:");
@ -44,6 +48,8 @@ extern "C" void common_handler(Context* context)
if (context->cs == 0x8) { int_panic(context, "Page fault in kernel task"); } if (context->cs == 0x8) { int_panic(context, "Page fault in kernel task"); }
else else
{ {
VMM::enter_syscall_context();
kerrorln("Page fault in ring 3 (RIP %lx), while trying to access %lx, error code %ld", context->rip, kerrorln("Page fault in ring 3 (RIP %lx), while trying to access %lx, error code %ld", context->rip,
context->cr2, context->error_code); context->cr2, context->error_code);
kinfoln("Stack trace:"); kinfoln("Stack trace:");
@ -51,6 +57,8 @@ extern "C" void common_handler(Context* context)
StackTracer tracer(context->rbp); StackTracer tracer(context->rbp);
tracer.trace_with_ip(context->rip); tracer.trace_with_ip(context->rip);
determine_user_page_fault_reason(context->cr2);
Scheduler::task_misbehave(context, -3); Scheduler::task_misbehave(context, -3);
} }
} }

20
kernel/src/utils/PageFaultReason.cpp Normal file
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@ -0,0 +1,20 @@
#define MODULE "mem"
#include "utils/PageFaultReason.h"
#include "log/Log.h"
#define PROGRAM_STACK_BOTTOM 0x100000
void determine_user_page_fault_reason(uintptr_t faulting_address)
{
if (faulting_address < 0x1000)
{
kinfoln("Address 0x%lx looks like a nullptr dereference", faulting_address);
return;
}
if (faulting_address < PROGRAM_STACK_BOTTOM && (PROGRAM_STACK_BOTTOM - faulting_address) < 0x1000)
{
kinfoln("Address 0x%lx looks like a stack overflow", faulting_address);
return;
}
}