linux-kernel - Re: [bug] /etc/profile: line 30: /dev/null: Permission denied (Was: Re: [PATCH] Remove broken by design and by implementation devtmpfs maintenance disaster)

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]

Date:	Fri, 25 Sep 2009 22:49:26 +0200
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <greg@...ah.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [bug] /etc/profile: line 30: /dev/null: Permission denied
	(Was: Re: [PATCH] Remove broken by design and by implementation
	devtmpfs maintenance disaster)

Hi!

> > > > > I've reproduced a bug with the following .config options:
> > > > >
> > > > > ??CONFIG_DEVTMPFS=y
> > > > > ??CONFIG_DEVTMPFS_MOUNT=y
> > > > >
> > > > > /dev/null and /dev/zero are not read/writable to ordinary users, 
> > > > > breaking normal bootup and login:
> > > > 
> > > > Udev should run long before some ordinary/non-root user can login, 
> > > > and apply the permissions as it always does. It's known to work on 
> > > > Fedora, SUSE, Ubuntu. What kind of system/environment/setup is that 
> > > > where you see this?
> > > 
> > > I don't know if this is what Ingo does, but I have a few machines 
> > > where I don't run the distro-supplied 'initrd' at all, because it's 
> > > easier to boot without it. The Fedora initrd doesn't allow me to 
> > > sanely set root filesystem parameters without totally rewriting the 
> > > initrd image, which I'm not interested in, for example (they'll take 
> > > effect for the root initrd, not the final root).
> > 
> > Correct: i'm booting raw bzImages, with /dev copied to the real /dev. To 
> > this box udev is mostly an annoyance that slows down my bootup ;-)
> 
> I use non-initrd systems as well, and this option works for me on Gentoo
> and SUSE machines.
> 
> As you are using a very old udev, and the boot infrastructure for udev
> in older Fedora releases was a bit "odd" in places, I would recommend
> not using these options on that machine.  If we need to reword the
> Kconfig help option to make it a bit more clear, do you have a
> suggestion on what we should change?

"no regressions" ?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
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/