Implement mprotect syscall #54
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Add the mprotect syscall (Linux syscall number 10) to allow changing memory protection flags on existing mapped regions. Implementation details: - Kernel: sys_mprotect validates page alignment, finds VMA covering the region, updates page table flags via unmap-remap strategy, and flushes TLB - ProcessPageTable: Added update_page_flags method that preserves the physical frame while changing protection flags - VMA: Protection flags are updated in the VMA tracking structure - libbreenix: Added MPROTECT syscall constant and mprotect wrapper - Tests: Extended test_mmap.rs with Test 3 that verifies mprotect can change a read-write region to read-only All 54 boot stages pass with zero warnings. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
The dispatcher.rs file also has a match on SyscallNumber that needed the Mprotect case added alongside handler.rs. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
mprotectsyscall (Linux syscall number 10) for changing memory protection flags on existing mapped regionsupdate_page_flagsmethod in ProcessPageTable using unmap-remap strategy to preserve physical frames while changing protectionImplementation Details
The mprotect syscall:
update_page_flags(unmap → remap with new flags)Test plan
🤖 Generated with Claude Code