From: Alexei Starovoitov <ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
To: "David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Cc: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Hannes Frederic Sowa
<hannes-tFNcAqjVMyqKXQKiL6tip0B+6BGkLq7r@public.gmane.org>,
Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Daniel Borkmann <daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>,
Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH net-next 1/2] bpf: enable non-root eBPF programs
Date: Wed, 7 Oct 2015 19:29:16 -0700 [thread overview]
Message-ID: <5615D4FC.1010706@plumgrid.com> (raw)
In-Reply-To: <1444078101-29060-2-git-send-email-ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
On 10/5/15 1:48 PM, Alexei Starovoitov wrote:
> Unprivileged socket filter bpf programs have access to the
> following helper functions:
> - map lookup/update/delete (but they cannot store kernel pointers into them)
> - get_random (it's already exposed to unprivileged user space)
> - get_smp_processor_id
> - tail_call into another socket filter program
> - ktime_get_ns
> - bpf_trace_printk (for debugging)
while reviewing everything for Nth time realized that
bpf_trace_printk is useless for unprivileged users, since
trace_pipe is root only.
So going to drop it in V2.
WARNING: multiple messages have this Message-ID (diff)
From: Alexei Starovoitov <ast@plumgrid.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: Andy Lutomirski <luto@amacapital.net>,
Ingo Molnar <mingo@kernel.org>,
Hannes Frederic Sowa <hannes@stressinduktion.org>,
Eric Dumazet <edumazet@google.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Kees Cook <keescook@chromium.org>,
linux-api@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 1/2] bpf: enable non-root eBPF programs
Date: Wed, 7 Oct 2015 19:29:16 -0700 [thread overview]
Message-ID: <5615D4FC.1010706@plumgrid.com> (raw)
In-Reply-To: <1444078101-29060-2-git-send-email-ast@plumgrid.com>
On 10/5/15 1:48 PM, Alexei Starovoitov wrote:
> Unprivileged socket filter bpf programs have access to the
> following helper functions:
> - map lookup/update/delete (but they cannot store kernel pointers into them)
> - get_random (it's already exposed to unprivileged user space)
> - get_smp_processor_id
> - tail_call into another socket filter program
> - ktime_get_ns
> - bpf_trace_printk (for debugging)
while reviewing everything for Nth time realized that
bpf_trace_printk is useless for unprivileged users, since
trace_pipe is root only.
So going to drop it in V2.
next prev parent reply other threads:[~2015-10-08 2:29 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-05 20:48 [PATCH net-next 0/2] bpf: unprivileged Alexei Starovoitov
2015-10-05 20:48 ` [PATCH net-next 1/2] bpf: enable non-root eBPF programs Alexei Starovoitov
2015-10-05 22:14 ` Daniel Borkmann
[not found] ` <5612F639.2050305-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2015-10-06 0:51 ` Alexei Starovoitov
2015-10-06 0:51 ` Alexei Starovoitov
[not found] ` <56131B1F.80002-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-06 7:13 ` Ingo Molnar
2015-10-06 7:13 ` Ingo Molnar
2015-10-06 8:05 ` Daniel Borkmann
2015-10-06 8:20 ` Ingo Molnar
[not found] ` <20151006082048.GA18287-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-10-06 8:39 ` Daniel Borkmann
2015-10-06 8:39 ` Daniel Borkmann
[not found] ` <561388D1.30406-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2015-10-06 17:50 ` Alexei Starovoitov
2015-10-06 17:50 ` Alexei Starovoitov
2015-10-06 17:56 ` Eric Dumazet
[not found] ` <1444154160.9555.5.camel-XN9IlZ5yJG9HTL0Zs8A6p/gx64E7kk8eUsxypvmhUTTZJqsBc5GL+g@public.gmane.org>
2015-10-06 18:05 ` Andy Lutomirski
2015-10-06 18:05 ` Andy Lutomirski
2015-10-07 6:05 ` Ingo Molnar
2015-10-06 19:26 ` Alexei Starovoitov
[not found] ` <561409EC.5050005-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-06 18:03 ` Daniel Borkmann
2015-10-06 18:03 ` Daniel Borkmann
2015-10-06 12:45 ` Daniel Borkmann
2015-10-06 12:45 ` Daniel Borkmann
2015-10-07 21:20 ` Alexei Starovoitov
[not found] ` <56158CAF.9030209-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-07 22:07 ` Daniel Borkmann
2015-10-07 22:07 ` Daniel Borkmann
2015-10-07 22:22 ` Kees Cook
2015-10-07 23:49 ` Alexei Starovoitov
[not found] ` <5615AF92.50402-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-08 6:21 ` Ingo Molnar
2015-10-08 6:21 ` Ingo Molnar
2015-10-08 6:30 ` Alexei Starovoitov
2015-10-08 17:42 ` Kees Cook
[not found] ` <1444078101-29060-2-git-send-email-ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-05 21:00 ` Kees Cook
2015-10-05 21:00 ` Kees Cook
2015-10-05 21:12 ` Alexei Starovoitov
[not found] ` <5612E7C4.1010306-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-10-05 21:16 ` Andy Lutomirski
2015-10-05 21:16 ` Andy Lutomirski
2015-10-05 21:32 ` Alexei Starovoitov
2015-10-05 22:02 ` Kees Cook
2015-10-06 0:28 ` Alexei Starovoitov
2015-10-08 2:29 ` Alexei Starovoitov [this message]
2015-10-08 2:29 ` Alexei Starovoitov
2015-10-05 20:48 ` [PATCH net-next 2/2] bpf: charge user for creation of BPF maps and programs Alexei Starovoitov
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