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Kernel: Print a helpful panic message for READONLY_AFTER_INIT crashes

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This commit is contained in:
Andreas Kling 2021-02-14 17:38:04 +01:00
parent d8013c60bb
commit a10accd48c
1 changed files with 8 additions and 0 deletions
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8
Kernel/Arch/i386/CPU.cpp
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@ -53,6 +53,9 @@
#include <Kernel/VM/ProcessPagingScope.h> #include <Kernel/VM/ProcessPagingScope.h>
#include <LibC/mallocdefs.h> #include <LibC/mallocdefs.h>
extern FlatPtr start_of_ro_after_init;
extern FlatPtr end_of_ro_after_init;
namespace Kernel { namespace Kernel {
static DescriptorTablePointer s_idtr; static DescriptorTablePointer s_idtr;
@ -265,6 +268,11 @@ void page_fault_handler(TrapFrame* trap)
handle_crash(regs, "Bad stack on page fault", SIGSTKFLT); handle_crash(regs, "Bad stack on page fault", SIGSTKFLT);
} }
if (fault_address >= (FlatPtr)&start_of_ro_after_init && fault_address < (FlatPtr)&end_of_ro_after_init) {
dump(regs);
PANIC("Attempt to write into READONLY_AFTER_INIT section");
}
auto response = MM.handle_page_fault(PageFault(regs.exception_code, VirtualAddress(fault_address))); auto response = MM.handle_page_fault(PageFault(regs.exception_code, VirtualAddress(fault_address)));
if (response == PageFaultResponse::ShouldCrash || response == PageFaultResponse::OutOfMemory) { if (response == PageFaultResponse::ShouldCrash || response == PageFaultResponse::OutOfMemory) {