netdev - null terminating of IFLA_INFO_KIND/IFLA

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-next>] [day] [month] [year] [list]

Date:   Wed, 17 Feb 2021 19:06:26 +0300
From:   Муравьев Александр 
        <amuravyev@...erra.ru>
To:     <netdev@...r.kernel.org>
Subject: null terminating of IFLA_INFO_KIND/IFLA_IFNAME

Hi

A noob question that I haven't found an answer.

Just wanted to clarify a piece of iproute2 code.

ip/iplink.c:

> 1058         addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
> 1059              strlen(type));

also ip/iplink.c:

> 1115         addattr_l(&req.n, sizeof(req),
> 1116               !check_ifname(name) ? IFLA_IFNAME : IFLA_ALT_IFNAME,
> 1117               name, strlen(name) + 1);
My question is why we skip terminating null character for IFLA_INFO_KIND 
(the first case) and don't skip it for IFLA_IFNAME (the second case)? I 
mean "strlen(type)" and "strlen(name) + 1".

-- 
Best regards,
Alexander Muravev