From: Steven Rostedt <rostedt@goodmis.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
"Serge E. Hallyn" <serge@hallyn.com>,
David Miller <davem@davemloft.net>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [REVIEW][PATCH 11/15] userns: Teach trace to use from_kuid
Date: Sat, 25 Aug 2012 20:18:36 -0400 [thread overview]
Message-ID: <1345940316.19381.1.camel@pippen.local.home> (raw)
In-Reply-To: <87wr0mecxz.fsf@xmission.com>
On Sat, 2012-08-25 at 17:04 -0700, Eric W. Biederman wrote:
> - When tracing capture the kuid.
> - When displaying the data to user space convert the kuid into the
> user namespace of the process that opened the report file.
>
> index 5c38c81..c9ace83 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -2060,7 +2060,8 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
> seq_puts(m, "# -----------------\n");
> seq_printf(m, "# | task: %.16s-%d "
> "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n",
> - data->comm, data->pid, data->uid, data->nice,
> + data->comm, data->pid,
> + from_kuid_munged(seq_user_ns(m), data->uid), data->nice,
This is a global id. That is, it stored whatever process triggered the
report, not the one reading it. Thus, two different readers could get a
different uid for the same task that triggered the latency?
-- Steve
> data->policy, data->rt_priority);
> seq_puts(m, "# -----------------\n");
>
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 55e1f7f..40a6f30 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -147,7 +147,7 @@ struct trace_array_cpu {
> unsigned long skipped_entries;
> cycle_t preempt_timestamp;
> pid_t pid;
> - uid_t uid;
> + kuid_t uid;
> char comm[TASK_COMM_LEN];
> };
>
next prev parent reply other threads:[~2012-08-26 0:19 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-25 23:54 [REVIEW][PATCH 0/15] userns subsystem conversions Eric W. Biederman
2012-08-25 23:58 ` [REVIEW][PATCH 01/15] userns: Enable building of pf_key sockets when user namespace support is enabled Eric W. Biederman
2012-08-25 23:59 ` [REVIEW][PATCH 02/15] userns: Make credential debugging user namespace safe Eric W. Biederman
2012-08-25 23:59 ` [REVIEW][PATCH 03/15] userns: Convert security/keys to the new userns infrastructure Eric W. Biederman
2012-08-26 0:00 ` [REVIEW][PATCH 04/15] userns: net: Call key_alloc with GLOBAL_ROOT_UID, GLOBAL_ROOT_GID instead of 0, 0 Eric W. Biederman
2012-08-26 0:00 ` [REVIEW][PATCH 05/15] userns: Convert ipc to use kuid and kgid where appropriate Eric W. Biederman
2012-08-26 0:01 ` [REVIEW][PATCH 07/15] userns: Convert taskstats to handle the user and pid namespaces Eric W. Biederman
2012-08-26 0:02 ` [REVIEW][PATCH 09/15] userns: Convert process event connector to handle kuids and kgids Eric W. Biederman
2012-08-26 12:33 ` Evgeniy Polyakov
2012-08-26 13:43 ` Eric W. Biederman
2012-08-26 0:03 ` [REVIEW][PATCH 10/15] userns: Convert debugfs to use kuid/kgid where appropriate Eric W. Biederman
2012-09-05 21:09 ` Greg Kroah-Hartman
2012-08-26 0:04 ` [REVIEW][PATCH 11/15] userns: Teach trace to use from_kuid Eric W. Biederman
2012-08-26 0:18 ` Steven Rostedt [this message]
2012-08-26 0:28 ` Eric W. Biederman
2012-08-26 0:05 ` [REVIEW][PATCH 12/15] userns: Convert drm to use kuid and kgid and struct pid where appropriate Eric W. Biederman
2012-09-13 1:31 ` Dave Airlie
2012-09-13 2:14 ` Eric W. Biederman
2012-09-13 3:29 ` Dave Airlie
2012-08-26 0:07 ` [REVIEW][PATCH 15/15] userns: Convert configfs to use kuid and kgid " Eric W. Biederman
2012-08-26 13:00 ` [PATCH 06/15] userns: Convert audit " Eric W. Biederman
[not found] ` <9E0E8AAC-9548-4009-AE29-D368244D8EEA@dubeyko.com>
2012-08-26 14:25 ` [REVIEW][PATCH 0/15] userns subsystem conversions Eric W. Biederman
[not found] ` <87harqecvk.fsf@xmission.com>
2012-08-27 8:50 ` [REVIEW][PATCH 13/15] userns: Add basic quota support Jan Kara
2012-08-27 15:54 ` Eric W. Biederman
2012-08-28 0:12 ` [PATCH] userns: Add basic quota support v2 Eric W. Biederman
2012-08-28 9:05 ` Jan Kara
2012-08-28 9:44 ` Boaz Harrosh
2012-08-28 17:34 ` Eric W. Biederman
2012-08-28 17:36 ` [PATCH] userns: Add basic quota support v3 Eric W. Biederman
2012-08-28 17:51 ` [PATCH] userns: Add basic quota support v2 Jan Kara
2012-08-28 19:09 ` [PATCH] userns: Add basic quota support v4 Eric W. Biederman
2012-08-29 2:10 ` Dave Chinner
2012-08-29 9:31 ` Eric W. Biederman
2012-08-31 1:17 ` Dave Chinner
2012-09-05 5:20 ` Eric W. Biederman
2012-09-20 1:28 ` Eric W. Biederman
2012-08-27 8:58 ` [REVIEW][PATCH 13/15] userns: Add basic quota support Steven Whitehouse
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