linux-kernel - Re: [PATCH net-next] bpf: add support for %s specifier to bpf_trace

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Message-ID: <55DFC048.4070504@plumgrid.com>
Date:	Thu, 27 Aug 2015 18:58:32 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>
Cc:	mingo@...nel.org, wangnan0@...wei.com, hekuang@...wei.com,
	daniel@...earbox.net, brendan.d.gregg@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] bpf: add support for %s specifier to
 bpf_trace_printk()

On 8/27/15 4:43 PM, Steven Rostedt wrote:
> On Thu, 27 Aug 2015 16:20:39 -0700 (PDT)
> David Miller <davem@...emloft.net> wrote:
>
>> From: Alexei Starovoitov <ast@...mgrid.com>
>> Date: Thu, 27 Aug 2015 16:06:14 -0700
>>
>>> Fair or you still think it should be per byte copy?
>>
>> I'm terribly surprised we don't have an equivalent of strncpy()
>> for unsafe kernel pointers.
>>
>> You probably won't be the last person to want this, and it's silly
>> to optimize it in one place and then wait for cut&paste into the
>> next guy.
>
> If it doesn't exist. Perhaps its time to create it.

all makes sense. Working on generalizing FETCH_FUNC_NAME
from trace_kprobe.c. Seems to fit quite well.


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