GNU bug report logs - #40837
core-updates: webkitgtk web process sandbox incomplete

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Message #31 received at 40837 <at> debbugs.gnu.org (full text, mbox):

From: Jack Hill <jackhill <at> jackhill.us>
To: 40837 <40837 <at> debbugs.gnu.org>
Cc: sirgazil <sirgazil <at> zoho.com>
Subject: Re: bug#40837: core-updates: webkitgtk web process sandbox incomplete
Date: Mon, 27 Apr 2020 23:03:52 -0400 (EDT)

I'm a little bit unstuck now. I found a bubblwrap issue [0], which I 
believe is the one that we're running into.

[0] https://github.com/containers/bubblewrap/issues/195 "Errors when 
--bind used with a symlinked path"

With insight gained there, I've determined that the following simplified 
bwrap invocation succeeds:

"""
$ bwrap  --ro-bind-try /etc/pulse/client.conf /etc/pulse/client.conf 
--ro-bind /gnu /gnu --ro-bind /run/current-system /run/current-system -- 
/run/current-system/profile/bin/bash
"""

while the following invocation fails:

"""
$ bwrap --ro-bind /etc /etc --ro-bind-try /etc/pulse/client.conf 
/etc/pulse/client.conf --ro-bind /gnu /gnu --ro-bind /run/current-system 
/run/current-system -- /run/current-system/profile/bin/bash

bwrap: Can't create file at /etc/pulse/client.conf: No such file or 
directory
"""

The difference between the working and non-working invocations in that in 
the non-working invocation, /etc is already mounted withing the new 
namespace, which includes symlinks at /etc/pulse and 
/etc/pulse/client.conf, and the later mount of the /etc/pulse/client.conf 
symlink causese the problem.

Now to figure out what the solution is, and if it is best fixed in 
webkitgtk or bubblewrap :)

Ideas welcome!

Best,
Jack

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