2e3d7c45af
Enable the NX bit on x86_64 and set if not PROT_EXEC and enable the write protection mode (CR0.WP) that disables the default behavior where the kernel is able to write to read-only memory. Fix kernel broken assumptions it can access read-only memory and take care to never set PROT_KWRITE on user-space pages unless PROT_WRITE is also set, otherwise user-space will be able to write to read-only memory. This achieves X^W in the whole system except for the core kernel itself as it is currently don't know the purpose of pages when identity mapping the first 4 MiB. |
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| .. | ||
| boot.S | ||
| crti.S | ||
| crtn.S | ||
| interrupt.S | ||
| kthread.S | ||
| memorymanagement.cpp | ||
| memorymanagement.h | ||
| syscall.S | ||