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Implement mprotect #41

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Merged
hexagonal-sun merged 4 commits into from
Nov 30, 2025
Merged

Implement mprotect #41

hexagonal-sun merged 4 commits into from
Nov 30, 2025

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@hexagonal-sun
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@hexagonal-sun hexagonal-sun commented Nov 29, 2025

Implement the mprotect syscall, splitting VMAs if required, etc.

@hexagonal-sun
libkernel: memory: VMArea: page align on from_pheader
3306b54 
Page align any non-aligned program headers, fixing up the file offset
and filesz accordingly.
@hexagonal-sun
libkernel: region: add punch_hole
f57a6db 
Add a function for calculating the set difference when punching one
region out of another.
@hexagonal-sun
libkernel: vmarea: shrink_to: implement
6d5bfac 
Implement a `shrink_to` function for a VMA. This shrinks the VMA's
region to the specified region, while recalculating file offsets and
size if the VMA is file-backed.
@hexagonal-sun hexagonal-sun changed the title WIP: implement mprotect Implement mprotect Nov 30, 2025
@hexagonal-sun
syscalls: mprotect: implement
ba6666f 
Implement the `mprotect` syscall. Including a bunch of tests for
ensuring proper VMA functionality regarding splitting and merging via
`mprotect`.
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hexagonal-sun commented Nov 30, 2025

@arihant2math @BjornTheProgrammer Please feel free to do a quick review.

On my machine, this implements enough syscall for me to be able to run busybox now!

[    0.628130] drivers::interrupts::arm_gic_v3: GICv3: CPU interface for core 3 enabled.
[    0.628500] arch::arm64::boot::secondary: CPU 3 online.
[    0.632754] interrupts::cpu_messenger: CPU 1 recieved ping from CPU 0
bash-5.3# ./bin/busybox
BusyBox v1.36.0 (2023-04-24 07:00:56 UTC) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --show SCRIPT
   or: busybox --install [-s] [DIR]
   or: function [arguments]...

🎉

BjornTheProgrammer
BjornTheProgrammer approved these changes Nov 30, 2025
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No modifications were needed to get this properly working on my machine!

arihant2math
arihant2math approved these changes Nov 30, 2025
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Same here (aarch64 macos host).

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hexagonal-sun commented Nov 30, 2025

Perfect. Thanks for checking.

@hexagonal-sun hexagonal-sun merged commit 910203e into master Nov 30, 2025
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