From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3253174-1523477361-2-1591218082038810631 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, RCVD_IN_DNSWL_NONE -0.0001, SPF_PASS -0.001, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='66.187.233.73', Host='mx3-rdu2.redhat.com', Country='US', FromHeader='com', MailFrom='com' X-Spam-charsets: plain='us-ascii' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: dhowells@redhat.com ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1523477360; b=f+86JL/Yqe22As1SJSXb1V7B78drrQ45tHoa5xSnAvNUmEIL03 52kEOXeVrDGKJk/u+hz2paf7LhaMpFnMvXwDStjc5xONdT6b1/tgXtCKhNB5MfAb EadjRkZXBj2wDctoz8ZHetLZVtWV+shwGIy4QasrZZQ2NjrU0b2oQD4dDNGvI22Z ++DxPl76CtlvhdK/OGIN1JvlShz9XmqFxmFkK9YVaPQSitZMLe8ZcdX+jzE+G+A4 O1sLQdO0acP3BsASUpdno18+0UNgxfJJuTcHIQib/fubyMXgGNmAEcGsSTIHRkxp QlE6mAqTMwKC9A8T4+OW3ehRn760CIXLkRog== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:in-reply-to:references:to:cc:subject :mime-version:content-type:content-id:date:message-id; s=fm2; t= 1523477360; bh=ITTLYzP0m48ThZWr+eYvsFYOFbPMirzMUIihozz9bIA=; b=V Riw3RnWCvFXI0wBHmveYZoDZWzCi1bUJoiteZWVxOveFpjRXlmpRekg/y5JdxQ59 k8/zxHSD+STYA/psmPRMbs56mxSMamH0WrqnYHrMUrzPJhAN7XSzwZ2Y6HKwKXcN T49D8nyxMqdlXzDeMQ+Jo5PLCS0j2xDhher3eoLGN7LwmKWjpCyO5L7sLGx95trb NYkCglpH6XH6sZ1RBXH4qNMZU14ThxQraw0x34lRRzN5agAkCNkQPQxIAz67qVjC u09eVugBT3X7QggHppQ523WDdejzaiQtkDd13xKQlCM/GJ3uTEEOO9cmpdPj65pH CvAcEYPL9gfdyMBgXQ8Vw== ARC-Authentication-Results: i=1; mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=pass (p=none,d=none) header.from=redhat.com; iprev=pass policy.iprev=66.187.233.73 (mx3-rdu2.redhat.com); spf=pass smtp.mailfrom=dhowells@redhat.com smtp.helo=mx1.redhat.com; x-aligned-from=pass (Address match); x-cm=none score=0; x-ptr=fail x-ptr-helo=mx1.redhat.com x-ptr-lookup=mx3-rdu2.redhat.com; x-return-mx=pass smtp.domain=redhat.com smtp.result=pass smtp_is_org_domain=yes header.domain=redhat.com header.result=pass header_is_org_domain=yes; x-tls=pass version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128; x-vs=clean score=-100 state=0 Authentication-Results: mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=pass (p=none,d=none) header.from=redhat.com; iprev=pass policy.iprev=66.187.233.73 (mx3-rdu2.redhat.com); spf=pass smtp.mailfrom=dhowells@redhat.com smtp.helo=mx1.redhat.com; x-aligned-from=pass (Address match); x-cm=none score=0; x-ptr=fail x-ptr-helo=mx1.redhat.com x-ptr-lookup=mx3-rdu2.redhat.com; x-return-mx=pass smtp.domain=redhat.com smtp.result=pass smtp_is_org_domain=yes header.domain=redhat.com header.result=pass header_is_org_domain=yes; x-tls=pass version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfOLtX3cHLCfYg4IWF3N7y0Op6UqJZrV9vaawUaPOaJhK4foOHnlfE1ExljZTU9LdkXcCkVkgUQjM/6zLYXjAVoO9QITQUWPpl6LmeYvDUuP1sNS7YaaH Bbm22IQ8ZVu7MfKjeK4HBvSt5HTyHkLyEjP4VXtUL3iEvarP3/OrcCu1cz32r2VfsABrgvnGFQLWbw== X-CM-Analysis: v=2.3 cv=WaUilXpX c=1 sm=1 tr=0 a=TkcyNeq6r+AnHXJUTB3xOA==:117 a=TkcyNeq6r+AnHXJUTB3xOA==:17 a=kj9zAlcOel0A:10 a=Kd1tUaAdevIA:10 a=2C6YHBdLAAAA:8 a=dhG99R2GNaa92lGwLz8A:9 a=CjuIK1q_8ugA:10 a=yxGMNg53M24zlVSZdvMH:22 X-ME-CMScore: 0 X-ME-CMCategory: none Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20180411195436.GA7126@kroah.com> References: <20180411195436.GA7126@kroah.com> <152346387861.4030.4408662483445703127.stgit@warthog.procyon.org.uk> <152346403637.4030.15247096217928429102.stgit@warthog.procyon.org.uk> To: Greg KH 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 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <12768.1523477356.1@warthog.procyon.org.uk> Date: Wed, 11 Apr 2018 21:09:16 +0100 Message-ID: <12769.1523477356@warthog.procyon.org.uk> X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Greg KH wrote: > Why not just disable debugfs entirely? This half-hearted way to sorta > lock it down is odd, it is meant to not be there at all, nothing in your > normal system should ever depend on it. > > So again just don't allow it to be mounted at all, much simpler and more > obvious as to what is going on. Yeah, I agree - and then I got complaints because it seems that it's been abused to allow drivers and userspace components to communicate. David