fix: add missing VmFlags to proc_pid_smaps parser

[lawrence3699]

Fixes #681

Problem

The proc_pid_smaps parser crashes with a KeyError when /proc/<pid>/smaps output contains VmFlags not present in vmflags_map. The wf (wipe on fork) flag, available since Linux 4.14, triggers this crash:

VmFlags: rd wr mr mw me nr wf dd sd dp
                             ^^
KeyError: 'wf'

Fix

1. Add three missing kernel VmFlags to the map: wf (wipe on fork), um (userfaultfd missing pages tracking), uw (userfaultfd write-protect pages tracking).
2. Change the lookup from vmflags_map[x] to vmflags_map.get(x, x) so any future unrecognized flags fall back to their raw abbreviation instead of crashing.

Validation

• Reproduced the KeyError before the fix
• All existing test_proc_pid_smaps tests pass
• Added regression test with a fixture containing the wf flag

[Copilot]

Pull request overview

This PR fixes a crash in the proc_pid_smaps parser when /proc/<pid>/smaps contains previously-unmapped VmFlags values (issue #681), by expanding the known VmFlags map and making the pretty-name lookup resilient to unknown flags.

Changes:

• Add missing VmFlags entries (wf, um, uw) to the parser’s vmflags_map.
• Replace direct vmflags_map[x] indexing with vmflags_map.get(x, x) to avoid KeyError on future/unknown flags.
• Add a regression test fixture and test case covering the wf flag.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
jc/parsers/proc_pid_smaps.py	Adds missing VmFlags and prevents crashes by using a safe lookup fallback.
tests/test_proc_pid_smaps.py	Loads the new fixture and adds a regression test for wf.
tests/fixtures/linux-proc/pid_smaps_wf_flag	New smaps fixture containing the wf VmFlag.
tests/fixtures/linux-proc/pid_smaps_wf_flag.json	Expected parsed JSON output including VmFlags_pretty with “wipe on fork”.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.