From: Christoph Pleger <christoph.pleger@cs.uni-dortmund.de>
To: Zdenek Kabelac <zdenek.kabelac@gmail.com>
Cc: linux-lvm@redhat.com
Subject: Re: [linux-lvm] lvcreate from a setuid-root binary
Date: Fri, 16 Nov 2018 17:12:41 +0100 [thread overview]
Message-ID: <e322a4b89bfd07c84c6ff22ac7bdc8a3@cs.uni-dortmund.de> (raw)
In-Reply-To: <ede72436-8c3c-aca9-e865-5525f9d74f0a@gmail.com>
Hello,
> How do you plan to 'authorize' passed command line options ??
My program has no command line options. It just takes PAM_USER from PAM
environment and creates a logical volume /dev/vg1/$PAM_USER, creates a
filesystem and changes directory permissions of the top directory of the
new filesystem.
> lvm2 is designed to be always executed with root privileges - so it's
> believed admin knows how he can destroy his own system.
>
> It is NOT designed/supposed to be used as suid binary - this would
> give user a way to big power to very easily destroy your filesystem
> and gain root privileges (i.e.by overwriting /etc/passwd file)
Either you misunderstood what I mean, or I am misunderstanding what you
mean - I do not set lvcreate suid root, but a program that has only a
small and well defined set of instructions (described above) and that
restricts its execution to only one user (by checking the real uid
before setuid(0)).
Regards
Christoph
next prev parent reply other threads:[~2018-11-16 16:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-15 16:39 [linux-lvm] lvcreate from a setuid-root binary Christoph Pleger
2018-11-15 17:57 ` Alasdair G Kergon
2018-11-16 13:43 ` Christoph Pleger
2018-11-16 15:32 ` Zdenek Kabelac
2018-11-16 16:12 ` Christoph Pleger [this message]
2018-11-16 17:21 ` Roger Heflin
2018-11-16 15:41 ` Stuart D. Gathman
2018-11-21 9:56 ` Christoph Pleger
2018-11-21 9:58 ` Vladislav Bogdanov
2018-11-21 10:23 ` Christoph Pleger
2018-11-17 0:24 ` Alasdair G Kergon
2018-11-19 8:55 ` Christoph Pleger
2018-11-19 13:01 ` Alasdair G Kergon
2018-11-19 13:19 ` Bryn M. Reeves
2018-11-19 15:17 ` Christoph Pleger
2018-11-19 15:35 ` Christoph Pleger
[not found] <1044845531.2858991.1542636286779.ref@mail.yahoo.com>
2018-11-19 14:04 ` matthew patton
2018-11-19 15:03 ` Christoph Pleger
[not found] <1479542688.2901829.1542643514135.ref@mail.yahoo.com>
2018-11-19 16:05 ` matthew patton
[not found] <1657965510.4711397.1542904883060.ref@mail.yahoo.com>
2018-11-22 16:41 ` matthew patton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e322a4b89bfd07c84c6ff22ac7bdc8a3@cs.uni-dortmund.de \
--to=christoph.pleger@cs.uni-dortmund.de \
--cc=linux-lvm@redhat.com \
--cc=zdenek.kabelac@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).