linux-kernel - Re: [PATCH net-next 1/3] bpf: introduce current->pid, tgid, uid, gid, comm accessors

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Message-ID: <CALCETrVCAZkoM2TsrxgeT7d+kWjLrcRt76wiPav1Fk7wz0z-3g@mail.gmail.com>
Date:	Fri, 12 Jun 2015 15:54:11 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Wang Nan <wangnan0@...wei.com>, Li Zefan <lizefan@...wei.com>,
	Daniel Wagner <daniel.wagner@...-carit.de>,
	Daniel Borkmann <daniel@...earbox.net>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] bpf: introduce current->pid, tgid, uid, gid,
 comm accessors

On Fri, Jun 12, 2015 at 3:44 PM, Alexei Starovoitov <ast@...mgrid.com> wrote:
> On 6/12/15 3:08 PM, Andy Lutomirski wrote:
>>
>> On Fri, Jun 12, 2015 at 2:40 PM, Alexei Starovoitov <ast@...mgrid.com>
>> wrote:
>>>
>>> eBPF programs attached to kprobes need to filter based on
>>> current->pid, uid and other fields, so introduce helper functions:
>>>
>>> u64 bpf_get_current_pid_tgid(void)
>>> Return: current->tgid << 32 | current->pid
>>>
>>> u64 bpf_get_current_uid_gid(void)
>>> Return: current_gid << 32 | current_uid
>>
>>
>> How does this work wrt namespaces,
>
>
> from_kuid(current_user_ns(), uid)
>

Is current_user_ns() well defined in the context of an eBPF program?

--Andy
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