[Bug 1860729] Review Request: wshowkeys - Displays keypresses on screen on supported Wayland compositors

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https://bugzilla.redhat.com/show_bug.cgi?id=1860729



--- Comment #3 from Bob Hepple <bob.hepple@xxxxxxxxx> ---
Thanks for the review!

>From the upstream homepage: "wshowkeys must be configured as setuid during
installation. It requires root permissions to read input events. These
permissions are dropped after startup." I confirmed this by trying to run
without setuid.

I have added '_hardened_build' as required.

It appears to work fine with mode 4711 so I've adopted that.

As for missing-call-to-setgroups-before-setuid I've not been able to silence
it.

I thought it might be related to
https://wiki.sei.cmu.edu/confluence/display/c/POS36-C.+Observe+correct+revocation+order+while+relinquishing+privileges
- but upstream seems to have done it the right way - but that's related to
setgid() rather than setgroups(). I tried addin a call to setgid(0) before
setuid(0) but that does not silence rpmlint.

I tried including a call to setgroups but I can't get the compiler to accept
it:

#include <grp.h>
...
        if (setgroups(0, NULL) != -1) {
                fprintf(stderr, "devmgr: failed to drop root\n");
                return 1;
        }

and the compiler error:

../devmgr.c: In function ‘devmgr_start’:
../devmgr.c:161:6: error: implicit declaration of function ‘setgroups’; did you
mean ‘getgroups’? [-Werror=implicit-function-declaration]
  161 |  if (setgroups(0, NULL) != -1) {
      |      ^~~~~~~~~
      |      getgroups

... not sure how to progress that.

Spec URL:
https://download.copr.fedorainfracloud.org/results/wef/wshowkeys/fedora-31-x86_64/01585065-wshowkeys/wshowkeys.spec
SRPM URL:
https://download.copr.fedorainfracloud.org/results/wef/wshowkeys/fedora-31-x86_64/01585065-wshowkeys/wshowkeys-0-3.20200727git6388a49.fc31.src.rpm


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