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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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| .. | ||
| cmos.cpp | ||
| cmos.h | ||
| float.cpp | ||
| float.h | ||
| gdt.cpp | ||
| gdt.h | ||
| idt.cpp | ||
| idt.h | ||
| interrupt.cpp | ||
| ioport.cpp | ||
| memorymanagement.cpp | ||
| memorymanagement.h | ||
| mtrr.cpp | ||
| pat.cpp | ||
| pic.cpp | ||
| pic.h | ||
| ps2.cpp | ||
| ps2.h | ||
| time.cpp | ||
| x86-family.cpp | ||