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(parent: eb8f954) | patch
feat: enable SMAP (Supervisor Mode Access Prevention)
authorTulio A M Mendes <[email protected]>
Sun, 15 Feb 2026 00:41:33 +0000 (21:41 -0300)
committerTulio A M Mendes <[email protected]>
Sun, 15 Feb 2026 00:41:33 +0000 (21:41 -0300)
commit7c107aa4ca5ae2d3235165f855476cb9f2b7b539
tree7884cbb27ef79b729d47db219d9ca1afe15176bctree | snapshot
parenteb8f954b15e64af98afdfc5d4c72e6db42c96406commit | diff
feat: enable SMAP (Supervisor Mode Access Prevention)

- STAC/CLAC bracket user memory accesses in copy_from_user/copy_to_user
- CR4.SMAP enabled when CPU supports it (CPUID leaf 7, EBX bit 20)
- g_smap_enabled runtime flag guards STAC/CLAC to avoid #UD on older CPUs
- Encoded as raw bytes (.byte 0x0F,0x01,0xCB/CA) for assembler compat
- 35/35 smoke tests pass, cppcheck clean
src/arch/x86/uaccess.c diff | blob | blame | history
src/hal/x86/cpu_features.c diff | blob | blame | history
AdrOS - A Unix-like Operating System for hobby/academic study.