linux-kernel - Re: [PATCH V8 03/14] rtla: Add osnoise tool

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Date:   Wed, 8 Dec 2021 17:14:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Tao Zhou <tao.zhou@...ux.dev>, Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 03/14] rtla: Add osnoise tool

On Thu, 2 Dec 2021 16:18:53 +0100
Daniel Bristot de Oliveira <bristot@...nel.org> wrote:

> >> +	if (!strcmp(context->orig_cpus, context->curr_cpus))
> >> +		goto out_done;
> >> +
> >> +	retval = write(context->cpus_fd, context->orig_cpus, strlen(context->orig_cpus));  
> > 
> > 'strlen(context->orig_cpus) + 1' for write size;
> >   
> >> +	if (retval < strlen(context->orig_cpus))  
> > 
> > Same here. Check 'strlen(context->orig_cpus) + 1'  
> 
> Fixed in v9.

And if you used the tracefs_instance_file_write() function, you would not
have had his bug ;-)

-- Steve