linux-hardening - Re: [RFC][PATCH v3 3/3] Rename nla_strlcpy to nla

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: <20201023082920.6addf3cb@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Fri, 23 Oct 2020 08:29:20 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     Kees Cook <keescook@...omium.org>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [RFC][PATCH v3 3/3] Rename nla_strlcpy to nla_strscpy.

On Fri, 23 Oct 2020 08:07:44 +0000 David Laight wrote:
> FWIW I suspect  the 'return -ERR on overflow' is going to bite us.
> Code that does p += strsxxx(p, ..., lim - p, ...) assuming (or not
> caring) about overflow goes badly wrong.

I don't really care either way, but in netlink there's usually an
attribute per value, nothing combines strings like p += strx..().
Looking at the conversion in patch 2 the callers just want to 
check for overflow.