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path: root/Kernel/Arch/x86/common/Interrupts.cpp
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Diffstat (limited to 'Kernel/Arch/x86/common/Interrupts.cpp')
-rw-r--r--Kernel/Arch/x86/common/Interrupts.cpp73
1 files changed, 42 insertions, 31 deletions
diff --git a/Kernel/Arch/x86/common/Interrupts.cpp b/Kernel/Arch/x86/common/Interrupts.cpp
index d9fb429941..271205aaa1 100644
--- a/Kernel/Arch/x86/common/Interrupts.cpp
+++ b/Kernel/Arch/x86/common/Interrupts.cpp
@@ -317,7 +317,7 @@ void page_fault_handler(TrapFrame* trap)
PageFault fault { regs.exception_code, VirtualAddress { fault_address } };
auto response = MM.handle_page_fault(fault);
- if (response == PageFaultResponse::ShouldCrash || response == PageFaultResponse::OutOfMemory) {
+ if (response == PageFaultResponse::ShouldCrash || response == PageFaultResponse::OutOfMemory || response == PageFaultResponse::BusError) {
if (faulted_in_kernel && handle_safe_access_fault(regs, fault_address)) {
// If this would be a ring0 (kernel) fault and the fault was triggered by
// safe_memcpy, safe_strnlen, or safe_memset then we resume execution at
@@ -325,6 +325,11 @@ void page_fault_handler(TrapFrame* trap)
return;
}
+ if (response == PageFaultResponse::BusError && current_thread->has_signal_handler(SIGBUS)) {
+ current_thread->send_urgent_signal_to_self(SIGBUS);
+ return;
+ }
+
if (response != PageFaultResponse::OutOfMemory && current_thread) {
if (current_thread->has_signal_handler(SIGSEGV)) {
current_thread->send_urgent_signal_to_self(SIGSEGV);
@@ -341,36 +346,40 @@ void page_fault_handler(TrapFrame* trap)
constexpr FlatPtr free_scrub_pattern = explode_byte(FREE_SCRUB_BYTE);
constexpr FlatPtr kmalloc_scrub_pattern = explode_byte(KMALLOC_SCRUB_BYTE);
constexpr FlatPtr kfree_scrub_pattern = explode_byte(KFREE_SCRUB_BYTE);
- if ((fault_address & 0xffff0000) == (malloc_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be uninitialized malloc() memory", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (free_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be recently free()'d memory", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (kmalloc_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be uninitialized kmalloc() memory", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (kfree_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be recently kfree()'d memory", VirtualAddress(fault_address));
- } else if (fault_address < 4096) {
- dbgln("Note: Address {} looks like a possible nullptr dereference", VirtualAddress(fault_address));
- } else if constexpr (SANITIZE_PTRS) {
- constexpr FlatPtr refptr_scrub_pattern = explode_byte(REFPTR_SCRUB_BYTE);
- constexpr FlatPtr nonnullrefptr_scrub_pattern = explode_byte(NONNULLREFPTR_SCRUB_BYTE);
- constexpr FlatPtr ownptr_scrub_pattern = explode_byte(OWNPTR_SCRUB_BYTE);
- constexpr FlatPtr nonnullownptr_scrub_pattern = explode_byte(NONNULLOWNPTR_SCRUB_BYTE);
- constexpr FlatPtr lockrefptr_scrub_pattern = explode_byte(LOCKREFPTR_SCRUB_BYTE);
- constexpr FlatPtr nonnulllockrefptr_scrub_pattern = explode_byte(NONNULLLOCKREFPTR_SCRUB_BYTE);
-
- if ((fault_address & 0xffff0000) == (refptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed LockRefPtr", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (nonnullrefptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed NonnullLockRefPtr", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (ownptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed OwnPtr", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (nonnullownptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed NonnullOwnPtr", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (lockrefptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed LockRefPtr", VirtualAddress(fault_address));
- } else if ((fault_address & 0xffff0000) == (nonnulllockrefptr_scrub_pattern & 0xffff0000)) {
- dbgln("Note: Address {} looks like it may be a recently destroyed NonnullLockRefPtr", VirtualAddress(fault_address));
+ if (response == PageFaultResponse::BusError) {
+ dbgln("Note: Address {} is an access to undefined memory range of a Inode-backed VMObject", VirtualAddress(fault_address));
+ } else {
+ if ((fault_address & 0xffff0000) == (malloc_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be uninitialized malloc() memory", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (free_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be recently free()'d memory", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (kmalloc_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be uninitialized kmalloc() memory", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (kfree_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be recently kfree()'d memory", VirtualAddress(fault_address));
+ } else if (fault_address < 4096) {
+ dbgln("Note: Address {} looks like a possible nullptr dereference", VirtualAddress(fault_address));
+ } else if constexpr (SANITIZE_PTRS) {
+ constexpr FlatPtr refptr_scrub_pattern = explode_byte(REFPTR_SCRUB_BYTE);
+ constexpr FlatPtr nonnullrefptr_scrub_pattern = explode_byte(NONNULLREFPTR_SCRUB_BYTE);
+ constexpr FlatPtr ownptr_scrub_pattern = explode_byte(OWNPTR_SCRUB_BYTE);
+ constexpr FlatPtr nonnullownptr_scrub_pattern = explode_byte(NONNULLOWNPTR_SCRUB_BYTE);
+ constexpr FlatPtr lockrefptr_scrub_pattern = explode_byte(LOCKREFPTR_SCRUB_BYTE);
+ constexpr FlatPtr nonnulllockrefptr_scrub_pattern = explode_byte(NONNULLLOCKREFPTR_SCRUB_BYTE);
+
+ if ((fault_address & 0xffff0000) == (refptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed LockRefPtr", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (nonnullrefptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed NonnullLockRefPtr", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (ownptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed OwnPtr", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (nonnullownptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed NonnullOwnPtr", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (lockrefptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed LockRefPtr", VirtualAddress(fault_address));
+ } else if ((fault_address & 0xffff0000) == (nonnulllockrefptr_scrub_pattern & 0xffff0000)) {
+ dbgln("Note: Address {} looks like it may be a recently destroyed NonnullLockRefPtr", VirtualAddress(fault_address));
+ }
}
}
@@ -390,6 +399,8 @@ void page_fault_handler(TrapFrame* trap)
}
}
+ if (response == PageFaultResponse::BusError)
+ return handle_crash(regs, "Page Fault (Bus Error)", SIGBUS, false);
return handle_crash(regs, "Page Fault", SIGSEGV, response == PageFaultResponse::OutOfMemory);
} else if (response == PageFaultResponse::Continue) {
dbgln_if(PAGE_FAULT_DEBUG, "Continuing after resolved page fault");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 05:06:43 +0000