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CONFIG_SECURITY_LOADPIN_VERITY: Allow reading files from certain other filesystems that use dm-verity

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The Linux kernel configuration item CONFIG_SECURITY_LOADPIN_VERITY:

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If selected LoadPin can allow reading files from filesystems that use dm-verity. LoadPin maintains a list of verity root digests it considers trusted. A verity backed filesystem is considered trusted if its root digest is found in the list of trusted digests.

The list of trusted verity can be populated through an ioctl on the LoadPin securityfs entry 'dm-verity'. The ioctl expects a file descriptor of a file with verity digests as parameter. The file must be located on the pinned root and start with the line:


This is followed by the verity digests, with one digest per line.



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