GNU bug report logs - #74220
invisible cursor

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jared Finder <jared <at> finder.org>
Cc: 74220 <at> debbugs.gnu.org, gerd.moellmann <at> gmail.com, ampinkas <at> gmail.com, stephen.berman <at> gmx.net, rpluim <at> gmail.com
Subject: bug#74220: invisible cursor
Date: Thu, 28 Nov 2024 22:20:28 +0200

> Date: Thu, 28 Nov 2024 10:21:53 -0800
> From: Jared Finder <jared <at> finder.org>
> Cc: "Jared Finder via \"Bug reports for GNU Emacs, the Swiss army knife of
>  text editors\"" <bug-gnu-emacs <at> gnu.org>, Robert Pluim <rpluim <at> gmail.com>,
>  Gerd Möllmann <gerd.moellmann <at> gmail.com>, Eli Zaretskii
>  <eliz <at> gnu.org>, 74220 <74220 <at> debbugs.gnu.org>, Avraham Pinkas
>  <ampinkas <at> gmail.com>
> 
> This was an intentional change to Linux 6.7 to avoid a potential 
> privilege escalation. Specifically, apps without the capability 
> CAP_SYS_ADMIN are no longer able to set the kernel selection buffer. 
> Across Emacs versions, granting the Emacs binary the CAP_SYS_ADMIN 
> capability (sudo setcap cap_sys_admin+ep path/to/emacs) fixes the issue.

Sorry, I don't follow: what does setting the kernel selection buffer
have to do with showing the cursor?  And how is it related to GPM?
What am I missing here?

> But is this the right fix? CAP_SYS_ADMIN grants many dangerous 
> capabilities on Linux. An alternative fix would be to update redisplay 
> on terminals to draw the mouse cursor. Perhaps this is what is done on 
> other OSes? I would like guidance here on which path is recommended.

Let's first understand the problem better.

(And I'm guessing that by "cursor" you mean "mouse pointer"?)

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