rust-osdev / rust-osdev/x86_64
`update_flags` does not add flags to parent page tables
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- Dominant language
- Rust
- Stars
- 940
- Forks
- 157
- Avg merge
- 1d 10h
- Merged PRs (30d)
- 3
Description
Steps to reproduce:
- Create a mapping without
USER_ACCESSIBLE - Update the flags to include
USER_ACCESSIBLE
Expected:
The page can be accessed by user mode.
Actual:
The page can't be accessed by user mode because even though the L1 entry has USER_ACCESSIBLE, the L2, L3, L4 entries may not be user accessible.
Contributor guide
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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
Start by locating the Rust implementation of update_flags and reproduce the mapping scenario described in the issue. Trace how flags are handled across the L1, L2, L3, and L4 entries. Done means adding USER_ACCESSIBLE through update_flags makes the page accessible from user mode at every required level.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100