Re: [PATCH] tftpd: strip leading slashes from the requested file name

tftpd-hpa's model needs a list of directories to validate an absolute
path against. BusyBox tftpd does not currently have such an allowlist
model. DIR just chroots into a single directory, nothing else.

I went back to bug 4874, the one this patch closes. The reporter's
own expected behavior was: absolute path translated to the tftpd dir
(/vmlinuz -> /boot/vmlinuz), or rejected if it falls outside. That's
stripping, not reject, not validate-against-a-list. The 2012 fix
covered the chroot case, with DIR. This patch is the no-DIR half of
that same request.

So this isn't a design choice I'm picking on my own. It's finishing
what was already asked for in 2012.

Ali