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[157.230.128.187]) by smtp.gmail.com with ESMTPSA id v77sm3451008ywv.79.2019.03.21.06.43.36 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 21 Mar 2019 06:43:39 -0700 (PDT) Received: by 42.do-not-panic.com (sSMTP sendmail emulation); Thu, 21 Mar 2019 13:43:35 +0000 Date: Thu, 21 Mar 2019 13:43:35 +0000 From: Luis Chamberlain To: Andrea Arcangeli Cc: "Dr. David Alan Gilbert" , Andrew Morton , Peter Xu , linux-kernel@vger.kernel.org, Paolo Bonzini , Hugh Dickins , Maxime Coquelin , Maya Gokhale , Jerome Glisse , Pavel Emelyanov , Johannes Weiner , Martin Cracauer , Denis Plotnikov , linux-mm@kvack.org, Marty McFadden , Mike Kravetz , Mike Rapoport , Kees Cook , Mel Gorman , "Kirill A . Shutemov" , linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 1/1] userfaultfd/sysctl: add vm.unprivileged_userfaultfd Message-ID: <20190321134335.GB1146@42.do-not-panic.com> References: <20190319030722.12441-1-peterx@redhat.com> <20190319030722.12441-2-peterx@redhat.com> <20190319110236.b6169d6b469a587a852c7e09@linux-foundation.org> <20190319182822.GK2727@work-vm> <20190320190112.GD23793@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190320190112.GD23793@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Mar 20, 2019 at 03:01:12PM -0400, Andrea Arcangeli wrote: > but > that would be better be achieved through SECCOMP and not globally.'. That begs the question why not use seccomp for this? What if everyone decided to add a knob for all syscalls to do the same? For the commit log, why is it OK then to justify a knob for this syscall? Luis