On Mon, Jul 21, 2025 at 08:42:40AM +0200, Thomas Weißschuh wrote:
This would still leave the exports for replace_fd(), create_pipe_files() and set_fs_pwd(). Instead of using kernel/umh.c,
Please look into a way to just run your userspace tests from userspace.
It's not that hard, people have done this novel concept for at least a few decades if you look into it.
I can also extend kernel/usermode_driver.c to provide these in a way that works for me. But kernel/usermode_driver.c is dead code, unused since commit 98e20e5e13d2 ("bpfilter: remove bpfilter") Would it be fine to export those symbols? And delete usermode_driver.c, as carrying around an unused generic framework seems pointless.
Unused code should always go away. Weirdly enough USERMODE_DRIVER is selected by BPF_PRELOAD despite that not really using any code from it, though.