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Kernel: Stack trace dumping validates pointers before using them

This commit is contained in:
Bananymous 2023-08-31 21:36:23 +03:00
parent 3ed0a54847
commit 65501837b7
1 changed files with 16 additions and 6 deletions
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22
kernel/kernel/Debug.cpp
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@ -1,5 +1,6 @@
#include <kernel/Debug.h>
#include <kernel/InterruptController.h>
#include <kernel/Memory/PageTable.h>
#include <kernel/Serial.h>
#include <kernel/SpinLock.h>
#include <kernel/Terminal/TTY.h>
@ -10,6 +11,8 @@ namespace Debug
void dump_stack_trace()
{
using namespace Kernel;
struct stackframe
{
stackframe* rbp;
@ -24,26 +27,33 @@ namespace Debug
}
uintptr_t first_rip = frame->rip;
uintptr_t last_rip = 0;
bool first = true;
BAN::Formatter::print(Debug::putchar, "\e[36mStack trace:\r\n");
while (frame)
{
BAN::Formatter::print(Debug::putchar, " {}\r\n", (void*)frame->rip);
frame = frame->rbp;
if (PageTable::current().is_page_free((vaddr_t)frame & PAGE_ADDR_MASK))
{
derrorln(" {} not mapped", frame);
break;
}
if (frame && frame->rip == first_rip)
BAN::Formatter::print(Debug::putchar, " {}\r\n", (void*)frame->rip);
if (!first && frame->rip == first_rip)
{
derrorln("looping kernel panic :(");
break;
}
if (frame && frame->rip == last_rip)
else if (!first && frame->rip == last_rip)
{
derrorln("repeating stack strace");
derrorln("repeating stack trace");
break;
}
last_rip = frame->rip;
frame = frame->rbp;
first = false;
}
BAN::Formatter::print(Debug::putchar, "\e[m");
}