netdev - Re: [PATCH v2 net-next 1/2] lib: introduce strncpy_from

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: <55E0DBE3.8010504@plumgrid.com>
Date:	Fri, 28 Aug 2015 15:08:35 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Wang Nan <wangnan0@...wei.com>, He Kuang <hekuang@...wei.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/2] lib: introduce strncpy_from_unsafe()

On 8/28/15 2:48 PM, Steven Rostedt wrote:
>>   * On success, returns the length of the string (not including the trailing
>> >+ * NUL).
> I think it includes the NUL.

oops. yes. that was a copy paste from strncpy_from_user comment.
trace_kprobe usage wants NUL to be counted, so I intended to have it
counted, but that brings the question what should be the semantics.
Should it be similar to strncpy_from_user (not counting NUL) or
similar to strlen_user (counts NUL) ?
imo counting NUL makes a little bit more sense, since when a user says
strncpy_from_unsafe(..., ..., 32)
and it returns 32 as the whole buffer was filled, it looks cleaner.
Thoughts?

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html