Bug#932380: Bug#932384: libc6: utmp broken

[Dmitry Bogatov]

[2019-07-18 17:56] Thorsten Glaser <t.glaser at tarent.de>
> Dmitry: please also move the chmod BELOW the chown, as chown
> is known to sometimes reset permissions (in some documented
> cases, not a bug):

1. Your patch changes permissions from 644 to 664. Is it deliberate?
2. Can you please provide pointers to documentation about chown
   permission rest to make comment about it?

   The only thing I found is (from Texinfo manual):

     The ‘chown’ command sometimes clears the set-user-ID or
     set-group-ID permission bits.

   but it does not seems to be relevant: `/var/run/utmp` is meant to
   have neither suid nor sgid bits.

> tglase at tglase:~ $ diff -u /etc/init.d/bootmisc.sh bootmisc.sh
> --- /etc/init.d/bootmisc.sh	2019-05-15 13:03:46.000000000 +0200
> +++ bootmisc.sh	2019-07-18 17:51:51.887830376 +0200
> @@ -33,8 +33,8 @@
>  
>  	readonly utmp='/var/run/utmp'
>  	if > "${utmp}" ; then
> -		chmod 644  "${utmp}" || log_warning_msg "failed to chmod ${utmp}"
>  		chgrp utmp "${utmp}" || log_warning_msg "failed to chgrp ${utmp}"
> +		chmod 664  "${utmp}" || log_warning_msg "failed to chmod ${utmp}"
>  		return 0
>  	else
>  		log_failure_msg "failed to truncate ${utmp}"
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