linux-kernel - [PATCH v6 7/7] mseal, system mappings: update mseal.rst

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Message-ID: <20250224174513.3600914-8-jeffxu@google.com>
Date: Mon, 24 Feb 2025 17:45:13 +0000
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	Jeff Xu <jeffxu@...omium.org>
Subject: [PATCH v6 7/7] mseal, system mappings: update mseal.rst

From: Jeff Xu <jeffxu@...omium.org>

Update memory sealing documentation to include details about system
mappings.

Signed-off-by: Jeff Xu <jeffxu@...omium.org>
---
 Documentation/userspace-api/mseal.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspace-api/mseal.rst
index 41102f74c5e2..10147281bf2d 100644
--- a/Documentation/userspace-api/mseal.rst
+++ b/Documentation/userspace-api/mseal.rst
@@ -130,6 +130,13 @@ Use cases
 
 - Chrome browser: protect some security sensitive data structures.
 
+- System mappings:
+  If supported by an architecture (via CONFIG_ARCH_HAS_MSEAL_SYSTEM_MAPPINGS),
+  the CONFIG_MSEAL_SYSTEM_MAPPINGS seals system mappings, e.g. vdso, vvar,
+  uprobes, sigpage, vectors, etc. CHECKPOINT_RESTORE, UML, gVisor, rr are
+  known to relocate or unmap system mapping, therefore this config can't be
+  enabled universally.
+
 When not to use mseal
 =====================
 Applications can apply sealing to any virtual memory region from userspace,
-- 
2.48.1.601.g30ceb7b040-goog