Commit Graph

2 Commits

Author SHA1 Message Date
Eric Biggers 432434c9f8 fs-verity: support builtin file signatures
To meet some users' needs, add optional support for having fs-verity
handle a portion of the authentication policy in the kernel.  An
".fs-verity" keyring is created to which X.509 certificates can be
added; then a sysctl 'fs.verity.require_signatures' can be set to cause
the kernel to enforce that all fs-verity files contain a signature of
their file measurement by a key in this keyring.

See the "Built-in signature verification" section of
Documentation/filesystems/fsverity.rst for the full documentation.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
2019-08-12 19:33:50 -07:00
Eric Biggers 8a1d0f9cac fs-verity: add data verification hooks for ->readpages()
Add functions that verify data pages that have been read from a
fs-verity file, against that file's Merkle tree.  These will be called
from filesystems' ->readpage() and ->readpages() methods.

Since data verification can block, a workqueue is provided for these
methods to enqueue verification work from their bio completion callback.

See the "Verifying data" section of
Documentation/filesystems/fsverity.rst for more information.

Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
2019-07-28 16:59:16 -07:00