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 11:04:59 -0400 [thread overview]
Message-ID: <20200730110459.5bf0b0df@oasis.local.home> (raw)
In-Reply-To: <80a23580-5067-93b0-53fa-3bd53253c056@sony.com>
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)
> + ),
> +
> + 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 );
-- 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 15:05 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 [this message]
2020-07-30 15:31 ` peter enderborg
2020-07-30 16:02 ` Steven Rostedt
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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