From: David Howells <dhowells@redhat.com>
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: dhowells@redhat.com, torvalds@linux-foundation.org,
linux-man@vger.kernel.org, linux-api@vger.kernel.org,
jmorris@namei.org, linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down
Date: Wed, 11 Apr 2018 21:08:21 +0100 [thread overview]
Message-ID: <12741.1523477301@warthog.procyon.org.uk> (raw)
In-Reply-To: <87zi29k26z.fsf@xmission.com>
Eric W. Biederman <ebiederm@xmission.com> wrote:
> Why is mounting debugfs allowed at all? Last I checked (it has been a while)
> the code quality of debugfs was fine for debugging but debugfs was not
> safe to mount on a production system.
>
> Maybe the code quality is better now but for a filesystem that is
> not supposed to be needed for developers letting us mount debugfs
> seems odd.
I agree. But debugfs has been abused and it seems that there are some things
that use it as an interface between a kernel driver and the userspace side.
David
next prev parent reply other threads:[~2018-04-11 20:08 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-11 16:24 [PATCH 00/24] security: Add kernel lockdown David Howells
2018-04-11 16:24 ` [PATCH 01/24] Add the ability to lock down access to the running kernel image David Howells
2018-04-11 16:44 ` Jann Horn
2018-04-11 17:37 ` Randy Dunlap
2018-04-11 18:50 ` Miguel Ojeda
2018-04-11 19:56 ` Greg KH
2018-04-11 17:49 ` David Howells
2018-04-11 18:09 ` Linus Torvalds
2018-04-11 18:35 ` Justin Forbes
2018-04-11 21:05 ` Jordan Glover
2018-04-11 22:38 ` Linus Torvalds
2018-04-12 13:09 ` Justin Forbes
2018-04-12 16:52 ` Linus Torvalds
2018-04-12 2:57 ` Andy Lutomirski
2018-04-11 16:24 ` [PATCH 02/24] Add a SysRq option to lift kernel lockdown David Howells
2018-04-11 17:05 ` Jann Horn
2018-04-13 20:22 ` Pavel Machek
2018-04-11 16:24 ` [PATCH 03/24] ima: require secure_boot rules in lockdown mode David Howells
2018-04-11 16:25 ` [PATCH 04/24] Enforce module signatures if the kernel is locked down David Howells
2018-04-11 16:25 ` [PATCH 05/24] Restrict /dev/{mem, kmem, port} when " David Howells
2018-04-11 16:25 ` [PATCH 06/24] kexec_load: Disable at runtime if " David Howells
2018-04-11 19:00 ` Eric W. Biederman
2018-04-11 20:09 ` Mimi Zohar
2018-04-12 11:38 ` Mimi Zohar
2018-04-11 20:05 ` David Howells
2018-04-11 16:25 ` [PATCH 07/24] hibernate: Disable when " David Howells
2018-04-13 20:22 ` Pavel Machek
2018-04-19 14:38 ` David Howells
2018-04-22 14:34 ` Andy Lutomirski
2018-04-26 7:26 ` Pavel Machek
2018-04-26 7:34 ` Rafael J. Wysocki
2018-04-26 8:20 ` Jiri Kosina
2018-05-23 8:46 ` joeyli
2018-04-11 16:25 ` [PATCH 08/24] uswsusp: " David Howells
2018-04-11 16:25 ` [PATCH 09/24] PCI: Lock down BAR access " David Howells
2018-04-11 16:25 ` [PATCH 10/24] x86: Lock down IO port " David Howells
2018-04-11 16:25 ` [PATCH 11/24] x86/msr: Restrict MSR " David Howells
2018-04-11 16:25 ` [PATCH 12/24] ACPI: Limit access to custom_method " David Howells
2018-04-11 16:26 ` [PATCH 13/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been " David Howells
2018-04-11 16:26 ` [PATCH 14/24] acpi: Disable ACPI table override if the kernel is " David Howells
2018-04-11 16:26 ` [PATCH 15/24] acpi: Disable APEI error injection " David Howells
2018-04-11 16:26 ` [PATCH 16/24] Prohibit PCMCIA CIS storage when " David Howells
2018-04-11 16:26 ` [PATCH 17/24] Lock down TIOCSSERIAL David Howells
2018-04-11 16:26 ` [PATCH 18/24] Lock down module params that specify hardware parameters (eg. ioport) David Howells
2018-04-11 17:22 ` Randy Dunlap
2018-04-11 16:26 ` [PATCH 19/24] x86/mmiotrace: Lock down the testmmiotrace module David Howells
2018-04-11 16:26 ` [PATCH 20/24] Lock down /proc/kcore David Howells
2018-04-11 16:26 ` [PATCH 21/24] Lock down kprobes David Howells
2018-04-11 16:27 ` [PATCH 22/24] bpf: Restrict kernel image access functions when the kernel is locked down David Howells
2018-04-11 16:27 ` [PATCH 23/24] Lock down perf David Howells
2018-04-11 16:27 ` [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down David Howells
2018-04-11 17:26 ` Randy Dunlap
2018-04-11 18:50 ` Eric W. Biederman
2018-04-11 19:54 ` Greg KH
2018-04-11 20:08 ` David Howells [this message]
2018-04-11 20:09 ` David Howells
2018-04-11 20:33 ` Greg KH
2018-04-12 2:54 ` Andy Lutomirski
2018-04-12 8:23 ` Greg KH
2018-04-12 14:19 ` Andy Lutomirski
2018-04-13 20:22 ` Pavel Machek
2018-04-19 14:35 ` David Howells
2018-05-10 11:01 ` Pavel Machek
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