linux-kernel - Re: [PATCH] cpupower: Correctly detect if running as root

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Message-ID: <12251128.9086t2JFoE@skinner>
Date:	Wed, 17 Dec 2014 17:22:54 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Michal Privoznik <mprivozn@...hat.com>, rafael.j.wysocki@...el.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpupower: Correctly detect if running as root

On Sunday, December 14, 2014 10:29:24 PM Rafael J. Wysocki wrote:
> On Sunday, December 14, 2014 01:36:52 PM Michal Privoznik wrote:
> > Some operations, like frequency-set, need root privileges. However,
> > the way that this is detected is not correct. The getuid() is called,
> > while in fact geteuid() should be. This way we can allow
> > distributions or users to set SETUID flags on the cpupower binary if
> > they want to and let regular users change the cpu frequency governor.
> > 
> > Signed-off-by: Michal Privoznik <mprivozn@...hat.com>
> 
> An ACK from Thomas is needed.
Patch is correct, Thanks!

Acked-by: Thomas Renninger <trenn@...e.de>

     Thomas
> 
> > ---
> > 
> >  tools/power/cpupower/utils/cpupower.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/power/cpupower/utils/cpupower.c
> > b/tools/power/cpupower/utils/cpupower.c index 7cdcf88..9ea9143 100644
> > --- a/tools/power/cpupower/utils/cpupower.c
> > +++ b/tools/power/cpupower/utils/cpupower.c
> > @@ -199,7 +199,7 @@ int main(int argc, const char *argv[])
> > 
> >  	}
> >  	
> >  	get_cpu_info(0, &cpupower_cpu_info);
> > 
> > -	run_as_root = !getuid();
> > +	run_as_root = !geteuid();
> > 
> >  	if (run_as_root) {
> >  	
> >  		ret = uname(&uts);
> >  		if (!ret && !strcmp(uts.machine, "x86_64") &&

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