tools / cpupower: Correctly detect if running as root

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@redhat.com>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/tools/power/cpupower/utils/cpupower.c b/tools/power/cpupower/utils/cpupower.c
index 7cdcf88659c77d75196b3e078b89b657bf53a26a..9ea91437898598bf31982f6073ec483e3d51f687 100644 (file)
--- 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") &&