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184996e92e
The new digest field in the metacopy xattr is used during lookup to record whether the header contained a digest in the OVL_HAS_DIGEST flags. When accessing file data the first time, if OVL_HAS_DIGEST is set, we reload the metadata and check that the source lowerdata inode matches the specified digest in it (according to the enabled verity options). If the verity check passes we store this info in the inode flags as OVL_VERIFIED_DIGEST, so that we can avoid doing it again if the inode remains in memory. The verification is done in ovl_maybe_validate_verity() which needs to be called in the same places as ovl_maybe_lookup_lowerdata(), so there is a new ovl_verify_lowerdata() helper that calls these in the right order, and all current callers of ovl_maybe_lookup_lowerdata() are changed to call it instead. Signed-off-by: Alexander Larsson <alexl@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.