On Mon, 16 Dec 2019 13:40:31 +0100 Toke Høiland-Jørgensen <toke@xxxxxxxxxx> wrote: > Probably the single most common error newcomers to XDP are stumped by is > the 'permission denied' error they get when trying to load their program > and 'ulimit -r' is set too low. For examples, see [0], [1]. > > Since the error code is UAPI, we can't change that. Instead, this patch > adds a few heuristics in libbpf and outputs an additional hint if they are > met: If an EPERM is returned on map create or program load, and geteuid() > shows we are root, and the current RLIMIT_MEMLOCK is not infinity, we > output a hint about raising 'ulimit -r' as an additional log line. > > [0] https://marc.info/?l=xdp-newbies&m=157043612505624&w=2 > [1] https://github.com/xdp-project/xdp-tutorial/issues/86 > > Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx> Acked-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx> This is the top #1 issue users hit again-and-again, too bad we cannot change the return code as it is UAPI now. Thanks for taking care of this mitigation. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
