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Howlett" Subject: [PATCH v9 6/7] mseal sysmap: update mseal.rst Date: Wed, 5 Mar 2025 02:17:10 +0000 Message-ID: <20250305021711.3867874-7-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250305021711.3867874-1-jeffxu@google.com> References: <20250305021711.3867874-1-jeffxu@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 636614000A X-Stat-Signature: sb9rc11xqek7hpiufgmf9piuwjgwh4y6 X-HE-Tag: 1741141052-254961 X-HE-Meta: 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 16A9xIKG UohDcxML2JPFmNxuge43XJMmaTpzUDGe34fxsbrvxaifPsiOCHtIHjBwThJa3KnpQZO8DE2v+ZY9XWO7G/LWJML63yDgN+GP7U1kvPRqmbfI3Ewh0ZjmrDUNFa8MbWgCcKYb3gJBeVHAvcVZdn3c6aJo2k2hBWsidP2c2CJZ76ZRMbiM34Cysmbo/7oTQ7lmnIk+uzPePj1mhidLB4Gyx4l6fA55CWUaDRZ5gn/Gl7pTscESce1dbRrQtw3dy0F98M6O1RUJ88tt0vmyCuKWMdmayORjYO5hfkNMa2OiRNpyUH4Kkk+QKGUfxMybg5jkThaoZ3RAD/eZIX46b5XQQ09KOtlRQencmCGvLWbsru/5BJNj1n/W6s2y18Q8c96PJC2FZ/T1Z0sBPD5ishma4A/BcFQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Jeff Xu Update memory sealing documentation to include details about system mappings. Signed-off-by: Jeff Xu Reviewed-by: Kees Cook Reviewed-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett --- Documentation/userspace-api/mseal.rst | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspace-api/mseal.rst index 41102f74c5e2..56aee46a9307 100644 --- a/Documentation/userspace-api/mseal.rst +++ b/Documentation/userspace-api/mseal.rst @@ -130,6 +130,26 @@ Use cases - Chrome browser: protect some security sensitive data structures. +- System mappings: + The system mappings are created by the kernel and includes vdso, vvar, + vvar_vclock, vectors (arm compat-mode), sigpage (arm compat-mode), uprobes. + + Those system mappings are readonly only or execute only, memory sealing can + protect them from ever changing to writable or unmmap/remapped as different + attributes. This is useful to mitigate memory corruption issues where a + corrupted pointer is passed to a memory management system. + + If supported by an architecture (CONFIG_ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS), + the CONFIG_MSEAL_SYSTEM_MAPPINGS seals all system mappings of this + architecture. + + The following architectures currently support this feature: x86-64 and arm64. + + WARNING: This feature breaks programs which rely on relocating + or unmapping system mappings. Known broken software at the time + of writing includes CHECKPOINT_RESTORE, UML, gVisor, rr. Therefore + this config can't be enabled universally. + When not to use mseal ===================== Applications can apply sealing to any virtual memory region from userspace, -- 2.48.1.711.g2feabab25a-goog