From: Tom Zanussi <tom.zanussi@linux.intel.com>
To: Steven Rostedt <rostedt@goodmis.org>, Tom Zanussi <zanussi@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH 2/2] tracing: Use strncpy instead of memcpy for string keys in hist triggers
Date: Mon, 04 Mar 2019 16:22:52 -0600 [thread overview]
Message-ID: <5643a1971831ce2d01a947f0f07cefa002bbdc25.camel@linux.intel.com> (raw)
In-Reply-To: <20190304165653.17699f9f@gandalf.local.home>
Hi Steve,
On Mon, 2019-03-04 at 16:56 -0500, Steven Rostedt wrote:
> On Mon, 4 Mar 2019 16:50:00 -0500
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > > +++ b/kernel/trace/trace_events_hist.c
> > > @@ -4695,9 +4695,10 @@ static inline void add_to_key(char
> > > *compound_key, void *key,
> > > /* ensure NULL-termination */
> > > if (size > key_field->size - 1)
> > > size = key_field->size - 1;
> > > - }
> > >
> > > - memcpy(compound_key + key_field->offset, key, size);
> > > + strncpy(compound_key + key_field->offset, (char *)key,
> > > size);
> > > + } else
> > > + memcpy(compound_key + key_field->offset, key, size);
> > > }
> > >
> >
> > Shouldn't we use strncpy() in save_comm() too. Feels safer.
>
> Note, if that is changed, it can be another patch. This one is fine
> as
> is. I just was looking at other use cases of memcpy() in that file.
>
Hmm, I don't think it's really necessary - it's not used in a key so
don't care about anything after the null, and TASK_COMM_LEN is used in
the memcpy.
Tom
> -- Steve
next prev parent reply other threads:[~2019-03-04 22:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 21:07 [PATCH 0/2] A couple hist trigger patches Tom Zanussi
2019-02-04 21:07 ` [PATCH 1/2] tracing: Use str_has_prefix() in synth_event_create() Tom Zanussi
2019-02-04 21:07 ` [PATCH 2/2] tracing: Use strncpy instead of memcpy for string keys in hist triggers Tom Zanussi
2019-03-04 21:50 ` Steven Rostedt
2019-03-04 21:56 ` Steven Rostedt
2019-03-04 22:22 ` Tom Zanussi [this message]
2019-03-04 22:31 ` Tom Zanussi
2019-03-04 23:45 ` Steven Rostedt
2019-03-05 0:02 ` Tom Zanussi
2019-03-04 20:11 ` [PATCH 0/2] A couple hist trigger patches Tom Zanussi
2019-03-04 21:26 ` Steven Rostedt
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