[LTP] [PATCH v4 1/8] fs/acl: Add ACL_USER_OBJ permissions test

[Cyril Hrubis]

Hi!
> This is an excellent suggestion. This will avoid userspace 
> username-to-UID lookups
> and libacl dependency. It simplifies tests while maintaining full 
> coverage of kernel
> ACL functionality.
> 
> The existing create_file_as() helper already demonstrates the 
> fork+setuid pattern
> needed for testing with arbitrary UIDs.
> 
> The logic can be:
> - Use setxattr(path, "system.posix_acl_access", buf, size, 0) to set 
> ACLs directly
> - Build xattr buffers with raw UID/GID values (no username lookups needed)
> - Fork child processes that call setuid(uid) + setgid(gid) to match ACL 
> entries
> - Test file access in child to validate kernel ACL enforcement
> 
> Let me know if this approach is acceptable.

Sounds good.

-- 
Cyril Hrubis
chrubis@suse.cz