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[209.85.218.48]) by smtp.gmail.com with ESMTPSA id o10-20020a170906600a00b00992b510089asm250429ejj.84.2023.10.17.11.38.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 17 Oct 2023 11:38:37 -0700 (PDT) Received: by mail-ej1-f48.google.com with SMTP id a640c23a62f3a-99de884ad25so972494666b.3 for ; Tue, 17 Oct 2023 11:38:37 -0700 (PDT) X-Received: by 2002:a17:906:4fc7:b0:9b2:b149:b81a with SMTP id i7-20020a1709064fc700b009b2b149b81amr2302073ejw.64.1697567917353; Tue, 17 Oct 2023 11:38:37 -0700 (PDT) MIME-Version: 1.0 References: <20231016143828.647848-1-jeffxu@chromium.org> <55960.1697566804@cvs.openbsd.org> In-Reply-To: <55960.1697566804@cvs.openbsd.org> From: Linus Torvalds Date: Tue, 17 Oct 2023 11:38:19 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC PATCH v1 0/8] Introduce mseal() syscall To: Theo de Raadt Cc: Jeff Xu , jeffxu@chromium.org, akpm@linux-foundation.org, keescook@chromium.org, sroettger@google.com, jorgelo@chromium.org, groeck@chromium.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, jannh@google.com, surenb@google.com, alex.sierra@amd.com, apopple@nvidia.com, aneesh.kumar@linux.ibm.com, axelrasmussen@google.com, ben@decadent.org.uk, catalin.marinas@arm.com, david@redhat.com, dwmw@amazon.co.uk, ying.huang@intel.com, hughd@google.com, joey.gouly@arm.com, corbet@lwn.net, wangkefeng.wang@huawei.com, Liam.Howlett@oracle.com, lstoakes@gmail.com, willy@infradead.org, mawupeng1@huawei.com, linmiaohe@huawei.com, namit@vmware.com, peterx@redhat.com, peterz@infradead.org, ryan.roberts@arm.com, shr@devkernel.io, vbabka@suse.cz, xiujianfeng@huawei.com, yu.ma@intel.com, zhangpeng362@huawei.com, dave.hansen@intel.com, luto@kernel.org, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 17 Oct 2023 at 11:20, Theo de Raadt wrote: > > The only case where the immutable marker is ignored is during address space > teardown as a result of process termination. .. and presumably also execve()? I do like us starting with just "mimmutable()", since it already exists. Particularly if chrome already knows how to use it. Maybe add a flag field (require it to be zero initially) just to allow any future expansion. Maybe the chrome team has *wanted* to have some finer granularity thing and currently doesn't use mimmutable() in some case? Linus