bug#38422: .png files in /gnu/store with executable permissions (555)

[Bengt Richter]

Hi Guix,

I was wanting to check on some executable files in the store,
and happened to see some executable .png files ;-/

I suspect they came in when I was playing with icecat
and let it load  a "theme", but I am not sure some didn't
also happen trying to get firefox radio buttons to work ;-/

Anyway, does anyone else get 555 permissions on files like these?
These are all *.png files with 555 permissons, but I trimmed back to see common 
prefixes.
Obviously the moka-con-theme was most of it, but also faba and docbook look 
iffy.

Is this zero-day stuff with a nasty somewhere, waiting for referencing by 
another nasty, or am I being paranoid?
What is the safe way to detoxify this mess? I know I shouldn't directly chmod 
anything in store, right?

The icecat discussion got moved to mozilla, but in case someone else did 
whatever I did,
I thought I'd post a heads-up here.
I'll try to cc Mark :)

$ find /gnu -type f -perm /111 -iname '*png'|xargs stat -c '%a %A %N'|cut -d 
'-' -f5,6,7,8|less|uniq -c|less
--8<---------------cut here---------------start------------->8---
      1 x 
'/gnu/store/.links/1s94fymqj8xba55rg8xbdni9a215kxsxkddyh2qyb7y6fl7srpng'
      1 x 
'/gnu/store/.links/05dsk06ffdwgjdqgsy03zhnsrcd44yyi8ylk9qyb1a3n89aplpng'
     97 x '/gnu/store/jf7i57glqykwgm1k7zb5k8x6f1yd47l8-faba-icon-theme
      1 x '/gnu/store/k83hj06qj142xv6rqpfh3mcdf3149q09-gd-2.2.5/bin/gdparttopng'
      1 x '/gnu/store/k83hj06qj142xv6rqpfh3mcdf3149q09-gd-2.2.5/bin/gdtopng'
      1 x '/gnu/store/k83hj06qj142xv6rqpfh3mcdf3149q09-gd-2.2.5/bin/webpng'
      1 x '/gnu/store/k83hj06qj142xv6rqpfh3mcdf3149q09-gd-2.2.5/bin/gd2topng'
      1 x 
'/gnu/store/x9c77i6r5fmarslij6ng81awgrxblplm-texlive-bin-20180414/bin/dvipng'
  34143 x '/gnu/store/yg6skr4v6vnj04rm5k9h3pa81mjivba7-moka-icon-theme
      1 x 
'/gnu/store/7mxkdn6cp7x8sac49p2g80qw5j1aavi3-texlive-20180414/bin/dvipng'
     62 x 
'/gnu/store/6d79d8za76pj5f2flhckpmdvdgqhqxaa-docbook-xsl-1.79.1/xml/xsl/docbook
      1 x 
'/gnu/store/azd3rg350gjkgzvzps3s4j3kpz5kxh57-texlive-bin-20180414/bin/dvipng'
      1 x 
'/gnu/store/9w1hi2hr4zczc5jd5r2xmff9zf4gwc1n-texlive-union-49435/bin/dvipng'
      1 x '/gnu/store/5hv33gy8w247v3dcf4dfa8p0ijkmiz5x-gd-2.2.5/bin/gdparttopng'
      1 x '/gnu/store/5hv33gy8w247v3dcf4dfa8p0ijkmiz5x-gd-2.2.5/bin/gdtopng'
      1 x '/gnu/store/5hv33gy8w247v3dcf4dfa8p0ijkmiz5x-gd-2.2.5/bin/webpng'
      1 x '/gnu/store/5hv33gy8w247v3dcf4dfa8p0ijkmiz5x-gd-2.2.5/bin/gd2topng'
      1 x '/gnu/store/9jgmsnx36wv8ymgalwd1zlmq3z34bqf0-gd-2.2.5/bin/gdparttopng'
      1 x '/gnu/store/9jgmsnx36wv8ymgalwd1zlmq3z34bqf0-gd-2.2.5/bin/gdtopng'
      1 x '/gnu/store/9jgmsnx36wv8ymgalwd1zlmq3z34bqf0-gd-2.2.5/bin/webpng'
      1 x '/gnu/store/9jgmsnx36wv8ymgalwd1zlmq3z34bqf0-gd-2.2.5/bin/gd2topng'

--8<---------------cut here---------------end--------------->8---

-- 
Regards,
Bengt Richter