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From: Tobias Geerinckx-Rice <me@tobias.gr>
To: guix-devel@gnu.org
Subject: Re: We should disable dmesg for unprivileged users by default
Date: Wed, 17 Jul 2019 09:04:22 +0200	[thread overview]
Message-ID: <87r26p9m6h.fsf@nckx> (raw)
In-Reply-To: <86h87qpv0u.fsf@gmail.com>

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Alex,

Alex Vong 写道:
> I think we should set /proc/sys/kernel/dmesg_restrict to 1 by 
> default to
> prevent unprivileged users from reading the kernel ring buffer 
> (since it
> could expose sensitive information about the system).
>
> Debian does this. I don't know about other distros.

I do this on all my Guix Systems by default; sounds good to me!

Let's do it by setting CONFIG_SECURITY_DMESG_RESTRICT=y in the 
kernel configuration: it changes the default 
/proc/sys/kernel/dmesg_restrict from 0 to 1, but still allows 
changing it later (I tried).

No overhead, no service whose only job is to flip an unwanted bit, 
no cmdline cruft.

Kind regards,

T G-R

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  parent reply	other threads:[~2019-07-17  7:04 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-13  1:45 We should disable dmesg for unprivileged users by default Alex Vong
2019-07-13  5:20 ` Pierre Neidhardt
2019-07-14 14:43 ` Ludovic Courtès
2019-07-15 12:48   ` Ricardo Wurmus
2019-07-16 22:58     ` Alex Vong
2019-07-17  7:04 ` Tobias Geerinckx-Rice [this message]
2019-07-17  7:26   ` [PATCH] gnu: linux-libre: Restrict ‘dmesg’ to privileged users Tobias Geerinckx-Rice
2019-07-26 22:41     ` [bug#36701] " Ludovic Courtès
2019-07-26 23:19       ` bug#36701: " Tobias Geerinckx-Rice via Guix-patches

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