enable stack protection

src/CMakeLists.txt

@@ -1,8 +1,8 @@
 
 add_executable(kernel.elf)
 
-target_compile_options(kernel.elf PUBLIC $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions -fno-rtti -ffreestanding>)
-target_compile_options(kernel.elf PUBLIC $<$<COMPILE_LANGUAGE:C>:-ffreestanding>)
+target_compile_options(kernel.elf PUBLIC $<$<COMPILE_LANGUAGE:CXX>:-fstack-protector-all -fno-exceptions -fno-rtti -ffreestanding>)
+target_compile_options(kernel.elf PUBLIC $<$<COMPILE_LANGUAGE:C>:-fstack-protector-all -ffreestanding>)
 
 add_subdirectory(./arch/)
 add_subdirectory(./kernel/)

src/arch/x86/CMakeLists.txt

@@ -21,8 +21,7 @@ target_sources(kernel.elf PRIVATE
         paging.cpp
         kmain.cpp
         gdt.cpp
-        misc.cpp
-        cppsupport.cpp)
+        misc.cpp)
 
 target_include_directories(kernel.elf PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 

src/kernel/CMakeLists.txt

@@ -1,3 +1,3 @@
 target_include_directories(kernel.elf PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 
-target_sources(kernel.elf PRIVATE mutex.cpp cv.cpp)
+target_sources(kernel.elf PRIVATE mutex.cpp cv.cpp cppsupport.cpp)

src/kernel/cppsupport.cpp

@@ -3,9 +3,23 @@
 //
 
 #include <cstddef>
+#include <cstdint>
 
 #include "kmem.hpp"
 #include "misc.hpp"
+#include "serial.hpp"
+
+#if UINT32_MAX == UINTPTR_MAX
+#define STACK_CHK_GUARD 0xb079a218
+#else
+#define STACK_CHK_GUARD 0x2e61e13e4d5ae23c
+#endif
+
+uintptr_t __stack_chk_guard = STACK_CHK_GUARD;
+
+extern "C" __attribute__((noreturn)) void __stack_chk_fail(void) {
+    assert2(false, "Stack protection triggered!");
+}
 
 extern "C" void __cxa_pure_virtual() {
     // Do nothing or print an error message.