VFS search permission checks, procfs stat ownership
* Add vfs_check_search() to validate execute permission on every
directory component of a path; wire into _resolve_user_path,
_resolve_writable_parent, sys_open, sys_chdir, and exec _open_file
* Add procfs_stat_owner() that walks a vfs_node's tree ancestors to
find its owning PID and return its uid/gid; apply override in
sys_stat_path and sys_fstat so stat(2) reflects process ownership
* Remove pixel-shift memmove optimisation from term scroll_up();
revert to mark_dirty_all() to fix visual corruption
* Fix ps output column widths using PS_COL_* constants and %*.*s
format specifiers for consistent alignment
8 files changed,
245 insertions,
28 deletions