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This LSM enforces that kernel-loaded files (modules, firmware, etc) must all come from the same filesystem, with the expectation that such a filesystem is backed by a read-only device such as dm-verity or CDROM. This allows systems that have a verified and/or unchangeable filesystem to enforce module and firmware loading restrictions without needing to sign the files individually. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
11 lines
515 B
Plaintext
11 lines
515 B
Plaintext
config SECURITY_LOADPIN
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bool "Pin load of kernel files (modules, fw, etc) to one filesystem"
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depends on SECURITY && BLOCK
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help
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Any files read through the kernel file reading interface
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(kernel modules, firmware, kexec images, security policy) will
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be pinned to the first filesystem used for loading. Any files
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that come from other filesystems will be rejected. This is best
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used on systems without an initrd that have a root filesystem
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backed by a read-only device such as dm-verity or a CDROM.
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