No cross-core TLB shootdown (IPI)
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- Dominant language
- Rust
- Stars
- 2.7k
- Forks
- 144
- Avg merge
- 12h 21m
- Merged PRs (30d)
- 146
Description
Currently, LiteBox kernel platforms do not support cross-core TLB shootdown. This can suffer from stale TLB entry issues when different cores share the same page table (e.g., pthreads, sessions of the same TA instance), resulting in use-after-free or stale permission violations. OP-TEE TAs are mostly safe because they don't call munmap/mprotect at runtime, but pthreads are not safe.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue names no files, tests, or entry points. Begin by locating the platform code that manages page tables and cross-core interrupts, then determine how shared address spaces should trigger TLB invalidation. Done means stale TLB entries cannot persist across cores after relevant mapping or permission changes, with coverage for pthreads or shared page tables.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- operating-systems
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100