From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexei Starovoitov <ast@fb.com>
Subject: Re: trace_printk issue. Was: [PATCH bpf-next] bpf, capabilities:
 introduce CAP_BPF
Date: Fri, 4 Oct 2019 19:56:04 +0000
Message-ID: <36f0efac-d6b6-9439-d4c6-361d84cb3429@fb.com>
References: <DA52992F-4862-4945-8482-FE619A04C753@amacapital.net>
 <20190829040721.ef6rumbaunkavyrr@ast-mbp.dhcp.thefacebook.com>
 <20190928193727.1769e90c@oasis.local.home> <201909301129.5A1129C@keescook>
 <20191001012226.vwpe56won5r7gbrz@ast-mbp.dhcp.thefacebook.com>
 <20191001181052.43c9fabb@gandalf.local.home>
 <6e8b910c-a739-857d-4867-395bd369bc6a@fb.com>
 <20191001184731.0ec98c7a@gandalf.local.home>
 <a98725c6-a7db-1d9f-7033-5ecd96438c8d@fb.com>
 <20191002190027.4e204ea8@gandalf.local.home>
 <20191003161838.7lz746aa2lzl7qi4@ast-mbp.dhcp.thefacebook.com>
 <20191003124148.4b94a720@gandalf.local.home>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <netdev-owner@vger.kernel.org>
In-Reply-To: <20191003124148.4b94a720@gandalf.local.home>
Content-Language: en-US
Content-ID: <7F8F31F328B1684A9E3CD6F78B415287@namprd15.prod.outlook.com>
Sender: netdev-owner@vger.kernel.org
To: Steven Rostedt <rostedt@goodmis.org>, Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Kees Cook <keescook@chromium.org>, Andy Lutomirski <luto@amacapital.net>, Andy Lutomirski <luto@kernel.org>, Alexei Starovoitov <ast@kernel.org>, LSM List <linux-security-module@vger.kernel.org>, James Morris <jmorris@namei.org>, Jann Horn <jannh@google.com>, Peter Zijlstra <peterz@infradead.org>, Masami Hiramatsu <mhiramat@kernel.org>, "David S. Miller" <davem@davemloft.net>, Daniel Borkmann <daniel@iogearbox.net>, Network Development <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>, Kernel Team <Kernel-team@fb.com>, Linux API <linux-api@vger.kernel.org>
List-Id: linux-api@vger.kernel.org
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