[PATCH 3/3] wall: Temporarily drop privileges when opening files

[Denys Vlasenko]

On Tuesday 08 October 2013 02:02, Ryan Mallon wrote:
> The wall applet is setuid and currently does no checking of the real
> user's read access to the message file. This allows the wall applet to
> be used to display files which are not readable by an unprivileged
> user. For example:
> 
>   $ wall /etc/shadow
>   $ wall /proc/vmallocinfo
> 
> Fix this by temporarily dropping privileges before opening the file.

Applied all three patches (with small modifications).
Thanks!