From: Steven Rostedt <rostedt@goodmis.org>
To: peter enderborg <peter.enderborg@sony.com>
Cc: "Thiébaud Weksteen" <tweek@google.com>,
"Paul Moore" <paul@paul-moore.com>,
"Nick Kralevich" <nnk@google.com>,
"Joel Fernandes" <joelaf@google.com>,
"Stephen Smalley" <stephen.smalley.work@gmail.com>,
"Eric Paris" <eparis@parisplace.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Rob Herring" <robh@kernel.org>,
linux-kernel@vger.kernel.org, selinux@vger.kernel.org
Subject: Re: [PATCH] RFC: selinux avc trace
Date: Thu, 30 Jul 2020 12:02:00 -0400 [thread overview]
Message-ID: <20200730120200.1367e1cd@oasis.local.home> (raw)
In-Reply-To: <6f1262fc-21ad-f872-5460-e78d4685c9c4@sony.com>
On Thu, 30 Jul 2020 17:31:17 +0200
peter enderborg <peter.enderborg@sony.com> wrote:
> On 7/30/20 5:04 PM, Steven Rostedt wrote:
> > On Thu, 30 Jul 2020 16:29:12 +0200
> > peter enderborg <peter.enderborg@sony.com> wrote:
> >
> >> +#undef TRACE_SYSTEM
> >> +#define TRACE_SYSTEM avc
> >> +
> >> +#if !defined(_TRACE_AVC_H) || defined(TRACE_HEADER_MULTI_READ)
> >> +#define _TRACE_AVC_H
> >> +
> >> +#include <linux/tracepoint.h>
> >> +TRACE_EVENT(avc_data,
> >> + TP_PROTO(u32 requested,
> >> + u32 denied,
> >> + u32 audited,
> >> + int result,
> >> + const char *msg
> >> + ),
> >> +
> >> + TP_ARGS(requested, denied, audited, result,msg),
> >> +
> >> + TP_STRUCT__entry(
> >> + __field(u32, requested)
> >> + __field(u32, denied)
> >> + __field(u32, audited)
> >> + __field(int, result)
> >> + __array(char, msg, 255)
> > You want to use __string() here, otherwise you are wasting a lot of
> > buffer space.
> >
> > __string( msg, msg)
> It should be a full structure with a lot of sub strings. But that make is even more relevant.
So one event instance can have a list of strings recorded?
> >
> >> + ),
> >> +
> >> + TP_fast_assign(
> >> + __entry->requested = requested;
> >> + __entry->denied = denied;
> >> + __entry->audited = audited;
> >> + __entry->result = result;
> >> + memcpy(__entry->msg, msg, 255);
> > Not to mention, the above is a bug. As the msg being passed in, is
> > highly unlikely to be 255 bytes. You just leaked all that memory after
> > the sting to user space.
> >
> > Where you want here:
> >
> > __assign_str( msg, msg );
>
> Directly in to the code. Was more in to get in to discussion on how complex we should have
> the trace data. There is a lot of fields. Not all is always present. Is there any good way
> to handle that? Like "something= somethingelse=42" or "something=nil somthingelse=42"
Can you show what you want to record and what you want to display? I'm
not totally understanding the request.
-- Steve
> >> + ),
> >> +
> >> + TP_printk("requested=0x%x denied=%d audited=%d result=%d
> >> msg=%s",
> >> + __entry->requested, __entry->denied, __entry->audited,
> >> __entry->result, __entry->msg
> >> + )
>
next prev parent reply other threads:[~2020-07-30 16:02 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-24 9:15 [PATCH] selinux: add tracepoint on denials Thiébaud Weksteen
2020-07-24 13:32 ` Stephen Smalley
2020-07-24 13:54 ` Paul Moore
2020-07-28 12:49 ` Thiébaud Weksteen
2020-07-28 13:04 ` Stephen Smalley
2020-07-28 13:19 ` Thiébaud Weksteen
2020-07-28 13:12 ` Steven Rostedt
2020-07-28 13:23 ` Thiébaud Weksteen
2020-07-28 15:12 ` Paul Moore
2020-07-28 16:02 ` Thiébaud Weksteen
2020-07-28 16:19 ` Stephen Smalley
2020-07-28 16:20 ` Paul Moore
2020-07-30 15:50 ` Thiébaud Weksteen
2020-07-30 8:03 ` peter enderborg
2020-07-24 13:52 ` Steven Rostedt
2020-07-30 14:29 ` [PATCH] RFC: selinux avc trace peter enderborg
2020-07-30 14:50 ` Stephen Smalley
2020-07-30 15:47 ` peter enderborg
2020-07-30 15:04 ` Steven Rostedt
2020-07-30 15:31 ` peter enderborg
2020-07-30 16:02 ` Steven Rostedt [this message]
2020-07-30 17:05 ` peter enderborg
2020-07-30 17:16 ` Steven Rostedt
2020-07-30 19:12 ` peter enderborg
2020-07-30 19:29 ` Steven Rostedt
2020-07-30 19:50 ` peter enderborg
2020-07-31 11:07 ` Thiébaud Weksteen
2020-07-28 15:22 ` [PATCH] selinux: add tracepoint on denials Joel Fernandes
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