[PATCH] um: fix execve stub execution on old host OSs

[Johannes Berg]

On Sun, 2025-06-08 at 20:38 +0200, Benjamin Berg wrote:
> > 
> > But my host kernel is 5.4 and fails to compile these pieces of codes because
> > there is no this syscall in my older kernel.
> > 
> > I was wondering if you are working on this issue. If not, I will try to 
> > make a draft solution to review.
> 
> I was not yet aware of that problem. Most likely only the one in
> start_up.c is a problem for you. All the other ones probably pick up
> the correct definition from the Linux tree already.
> 
> One can probably solve it by moving the code into another file. Or
> maybe by adding an entry for __NR_close_range into common-offests.h and
> using that.

Seems though we might need to add checking for close_range to the
seccomp init though, it's actually (much) newer than seccomp. Or just
not rely on it?

johannes