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Kernel: Implement stack trace dump with safe memcpy

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This fixes kernel panic if the stack trace cannot be read. Manually
validating pointers is definitely not safe
This commit is contained in:
Bananymous
2026-04-21 21:20:52 +03:00
parent b74812d669
commit 6b43cadf3a
2 changed files with 32 additions and 35 deletions
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15
kernel/kernel/IDT.cpp
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@@ -191,6 +191,8 @@ namespace Kernel
},
};
bool g_safe_user_alloc_nonexisting { true };
extern "C" void cpp_isr_handler(uint32_t isr, uint32_t error, InterruptStack* interrupt_stack, const Registers* regs)
{
if (g_paniced)
@@ -214,6 +216,16 @@ namespace Kernel
PageFaultError page_fault_error;
page_fault_error.raw = error;
const uint8_t* ip = reinterpret_cast<const uint8_t*>(interrupt_stack->ip);
if (!g_safe_user_alloc_nonexisting) for (const auto& safe_user : s_safe_user_page_faults)
{
if (ip < safe_user.ip_start || ip >= safe_user.ip_end)
continue;
interrupt_stack->ip = reinterpret_cast<vaddr_t>(safe_user.ip_fault);
return;
}
Processor::set_interrupt_state(InterruptState::Enabled);
auto result = Process::current().allocate_page_for_demand_paging(regs->cr2, page_fault_error.write, page_fault_error.instruction);
Processor::set_interrupt_state(InterruptState::Disabled);
@@ -234,8 +246,7 @@ namespace Kernel
if (result.value())
return;
const uint8_t* ip = reinterpret_cast<const uint8_t*>(interrupt_stack->ip);
for (const auto& safe_user : s_safe_user_page_faults)
if (g_safe_user_alloc_nonexisting) for (const auto& safe_user : s_safe_user_page_faults)
{
if (ip < safe_user.ip_start || ip >= safe_user.ip_end)
continue;