From c9f46f3773e7943ce114af888a44f50061c2ac1d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Matteo=20Gm=C3=BCr?= Date: Tue, 6 May 2025 13:40:42 +0000 Subject: Remove user Mode Access to VGA / Heap and Kernel Methods. --- arch/x86_64/src/user/main.cpp | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'arch/x86_64/src/user/main.cpp') diff --git a/arch/x86_64/src/user/main.cpp b/arch/x86_64/src/user/main.cpp index 3ddcb32..3e7b0ec 100644 --- a/arch/x86_64/src/user/main.cpp +++ b/arch/x86_64/src/user/main.cpp @@ -3,21 +3,31 @@ #include "arch/context_switching/syscall/main.hpp" // TODO: Disallow this import +#include "arch/kernel/cpu/if.hpp" #include "arch/video/vga/text.hpp" namespace teachos::arch::user { - [[gnu::section(".user_text")]] auto main() -> void { char constexpr syscall_message[] = "Successfully entered user mode and wrote to VGA buffer via syscall!"; auto const error = context_switching::syscall::syscall(context_switching::syscall::type::WRITE, {reinterpret_cast(&syscall_message)}); + kernel::cpu::clear_interrupt_flag(); // Causes crash Kernel Code (.text) is not mapped in User mMde + + auto test = new int{20}; // Causes crash Heap is not mapped in User Mode + (void)test; + if (!error) { + // Causes crash vga is not mapped in User Mode video::vga::text::write("Successfully made a SYSCALL and returned with SYSRETQ!", video::vga::text::common_attributes::green_on_black); } + + for (;;) + { + } } } // namespace teachos::arch::user -- cgit v1.2.3