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Message-ID: <8533255d-9b73-cdbe-fbbd-28a275313229@iogearbox.net> Date: Thu, 26 Oct 2023 16:25:33 +0200 From: Daniel Borkmann <daniel@...earbox.net> To: Nikolay Aleksandrov <razor@...ckwall.org>, Ido Schimmel <idosch@...sch.org> Cc: bpf@...r.kernel.org, jiri@...nulli.us, netdev@...r.kernel.org, martin.lau@...ux.dev, ast@...nel.org, andrii@...nel.org, john.fastabend@...il.com, kuba@...nel.org, andrew@...n.ch, toke@...nel.org, toke@...hat.com, sdf@...gle.com Subject: Re: [PATCH bpf-next 2/2] netkit: use netlink policy for mode and policy attributes validation On 10/26/23 4:23 PM, Nikolay Aleksandrov wrote: > On 10/26/23 17:11, Ido Schimmel wrote: >> On Thu, Oct 26, 2023 at 12:41:06PM +0300, Nikolay Aleksandrov wrote: >>> static const struct nla_policy netkit_policy[IFLA_NETKIT_MAX + 1] = { >>> [IFLA_NETKIT_PEER_INFO] = { .len = sizeof(struct ifinfomsg) }, >>> - [IFLA_NETKIT_POLICY] = { .type = NLA_U32 }, >>> - [IFLA_NETKIT_MODE] = { .type = NLA_U32 }, >>> - [IFLA_NETKIT_PEER_POLICY] = { .type = NLA_U32 }, >>> + [IFLA_NETKIT_POLICY] = NLA_POLICY_VALIDATE_FN(NLA_U32, >>> + netkit_check_policy), >> >> Nik, it's problematic to use NLA_POLICY_VALIDATE_FN() with anything >> other than NLA_BINARY. See commit 9e17f99220d1 ("net/sched: act_mpls: >> Fix warning during failed attribute validation"). > > But how is that code called at all? The validation type is NLA_VALIDATE_FUNCTION(), not NLA_VALIDATE_MIN/MAX/RANGE/RANGE_WARN... > nla_validate_int_range() is called only on: > case NLA_VALIDATE_RANGE_PTR: > case NLA_VALIDATE_RANGE: > case NLA_VALIDATE_RANGE_WARN_TOO_LONG: > case NLA_VALIDATE_MIN: > case NLA_VALIDATE_MAX: > > Anyway, I'll switch to NLA_BINARY in a bit to make sure it's ok. Thanks for the pointer. Sg, I took in the NULL removal one for now. Thanks, Daniel
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