netdev - Re: [RFC 03/12] net: cls_bpf: limit hardware offload by software-only flag

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <574F51E4.2020504@iogearbox.net>
Date:	Wed, 01 Jun 2016 23:21:40 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:	netdev@...r.kernel.org, ast@...nel.org,
	dinan.gunawardena@...ronome.com
Subject: Re: [RFC 03/12] net: cls_bpf: limit hardware offload by software-only
 flag

On 06/01/2016 11:05 PM, Jakub Kicinski wrote:
> On Wed, 01 Jun 2016 21:40:23 +0200, Daniel Borkmann wrote:
[...]
>>> @@ -400,8 +406,11 @@ static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
>>>
>>>    		have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
>>>    	}
>>> +	if (tb[TCA_BPF_GEN_TCA_FLAGS])
>>> +		gen_flags = nla_get_u32(tb[TCA_BPF_GEN_TCA_FLAGS]);
>>>
>>>    	prog->exts_integrated = have_exts;
>>> +	prog->gen_flags = gen_flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
>>
>> Invalid flags should probably be rejected here with -EINVAL or something.
>
> Indeed, that would be more in line with what is done for "the other"
> flags attribute, but not so much with how flower and u32 handles
> flags. I like the stricter approach better, though, so unless someone
> speaks up I'll do as you suggest.

If I see this correctly, in patch 4 you're already following up on that
with the tc_flags_valid() check, it's probably okay to leave it as-is then.