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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next prev parent reply other threads:[~2019-07-17 7:04 UTC|newest]
Thread overview: 8+ 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
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