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Wed, 28 Oct 2026 12:18:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 3uAeNSTo4WqLbwAAD6G6ig (envelope-from ); Wed, 28 Oct 2026 12:18:45 +0000 Date: Wed, 28 Oct 2026 12:18:43 +0000 From: Pedro Falcato To: Chris Down Cc: Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn , David Hildenbrand , Kees Cook , Jeff Xu , Andrey Vagin , Alexander Mikhalitsyn , Paul Moore , James Morris , "Serge E. Hallyn" , Shuah Khan , Jonathan Corbet , linux-mm@kvack.org, linux-hardening@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH 1/3] mseal sysmap: Add mseal_system_mappings= boot parameter Message-ID: References: <5bd3c89d733ad22224f296dfa8900769de937de0.1793094611.git.chris@chrisdown.name> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5bd3c89d733ad22224f296dfa8900769de937de0.1793094611.git.chris@chrisdown.name> X-Rspamd-Queue-Id: DB2AB2212C X-Spam-Level: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Flag: NO X-Spamd-Result: default: False [-13.51 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; MISSING_XM_UA(0.00)[]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[23]; MIME_TRACE(0.00)[0:+]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[linux-foundation.org,infradead.org,kernel.org,google.com,chromium.org,gmail.com,mihalicyn.com,paul-moore.com,namei.org,hallyn.com,lwn.net,kvack.org,vger.kernel.org,meta.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+] X-Spam-Score: -13.51 On Tue, Oct 27, 2026 at 07:43:04PM +0800, Chris Down wrote: > CONFIG_MSEAL_SYSTEM_MAPPINGS seals each process' system mappings when > they are created. As it is today this can only be toggled at build time, > so hosts that need sealing and hosts running software which moves or > unmaps these mappings end up with separate kernels. This is not ideal > since it adds more complexity of deployment, it would be great to be > able to have one kernel which can configurably do both. > > So, to improve this, let's add mseal_system_mappings= so that this can > be chosen at boot. I'm very curious, do you actually have a usecase for this? -- Pedro