From: Jeff Xu <jeffxu@xxxxxxxxxxxx> Update memory sealing documentation to include details about system mappings. Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxxxx> Reviewed-by: Kees Cook <kees@xxxxxxxxxx> --- 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, -- 2.48.1.658.g4767266eb4-goog
