linux-kernel - Re: [PATCH] scsi: allow persistent reservations without CAP_SYS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FD778BA.8040201@redhat.com>
Date:	Tue, 12 Jun 2012 19:13:30 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	John Stoffel <john@...ffel.org>
CC:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	linux-scsi@...r.kernel.org, jbottomley@...allels.com
Subject: Re: [PATCH] scsi: allow persistent reservations without CAP_SYS_RAWIO

Il 12/06/2012 19:08, John Stoffel ha scritto:
> Paolo> Persistent reservations commands cannot be issued right now
> Paolo> without giving CAP_SYS_RAWIO to the process who wishes to send
> Paolo> them.  This is a bit heavy-handed, allow these two commands.
> 
> This seems like a bad idea, now anyone can just put in a SCSI
> reservation on a system and then you have to hunt around trying to
> figure it out.  

What's the difference from anyone destroying data on a disk?  You still
need write access to the block device node.  Also, you could already do
the same if you have root permissions on your _local_ machine.

(BTW, please reply to these objections where I already stated them, in
the answer to James Bottomley).

> What's the motivation here?  What's the use case this solves?  

I would like to give access to persistent reservations to VMs, without
having to run qemu as root.  One alternative is to run a userspace iSCSI
initiator, but of course that would only work with iSCSI.

Paolo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/