Date: Sun, 21 Jan 2018 01:31:36 +0100 From: Polytropon <freebsd@edvax.de> To: Ralf Mardorf <ralf.mardorf@rocketmail.com> Cc: Ralf Mardorf via freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: xfce4 reverts to mirrored dislays Message-ID: <20180121013136.3bf3440a.freebsd@edvax.de> In-Reply-To: <20180120202134.7e20734b@archlinux.localdomain> References: <c89fe0ea-d072-2a4b-ad02-74041e3bd181@nethead.se> <20180120125636.6ad88128.freebsd@edvax.de> <20180120134001.65ddb697@archlinux.localdomain> <20180120141518.7a85ed99@planb.netng.org> <2c24a50e-c7d1-0841-bee6-9f015d48a927@nethead.se> <20180120170942.532834dd.freebsd@edvax.de> <c38bac7e-7fd2-254a-814c-5ea9d6d6e1d2@nethead.se> <20180120190647.01b163d0@archlinux.localdomain> <a7258db0-80c2-5d91-d41c-b34e2235ad57@nethead.se> <20180120200846.e0925689.freebsd@edvax.de> <20180120202134.7e20734b@archlinux.localdomain>
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On Sat, 20 Jan 2018 20:21:34 +0100, Ralf Mardorf via freebsd-questions wrote:
> On Sat, 20 Jan 2018 20:08:46 +0100, Polytropon wrote:
> >As it seems, the immutable flag is not set.
>
> Indeed, this makes sense, while my second guess is idiotic, see on Sat,
>
> 20 Jan 2018 19:23:02 +0100, Ralf Mardorf wrote:
> >On Sat, 20 Jan 2018 19:06:47 +0100, Ralf Mardorf wrote:
> >>actually it's impossible to change permissions of an immutable file.
> >
> >Perhaps I'm mistaken regarding "permissions",however, what ever the
> >permissions should be, the file remains immutable,
> >un-over{ride,write}able ;).
>
> Somebody needs to have permission to set or clear the immutable flag ;).
Being able to change the permissions or ownership would first
require "chflags noschg", which usually only root can perform.
So even though my suggestion doesn't deserve the name "solution",
it _should_ actually prevent any file changes, even if the
process which changes the file is UID 0.
# touch /tmp/testfile
# ll -o /tmp/testfile
-rw-r--r-- 1 root wheel - 0 2018-01-21 01:27:49 /tmp/testfile
# chmod -w /tmp/testfile
# ll -o /tmp/testfile
-r--r--r-- 1 root wheel - 0 2018-01-21 01:27:49 /tmp/testfile
^
Writing flag is gone.
# chflags schg /tmp/testfile
# ll -o /tmp/testfile
-r--r--r-- 1 root wheel schg 0 2018-01-21 01:27:49 /tmp/testfile
The file is now locked / immutable.
# chown ftp:ftp /tmp/testfile
chown: /tmp/testfile: Operation not permitted
# chmod +w /tmp/testfile
chmod: /tmp/testfile: Operation not permitted
# rm /tmp/testfile
override r--r--r-- root/wheel schg for /tmp/testfile? y
rm: /tmp/testfile: Operation not permitted
Without a "chflags noschg" issued by root, the file will stay
as it is (content, ownership, permissions).
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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