Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/verity/Kconfig b/fs/verity/Kconfig
new file mode 100644
index 0000000000..e1036e5353
--- /dev/null
+++ b/fs/verity/Kconfig
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+# SPDX-License-Identifier: GPL-2.0
+
+config FS_VERITY
+	bool "FS Verity (read-only file-based authenticity protection)"
+	select CRYPTO
+	select CRYPTO_HASH_INFO
+	# SHA-256 is implied as it's intended to be the default hash algorithm.
+	# To avoid bloat, other wanted algorithms must be selected explicitly.
+	# Note that CRYPTO_SHA256 denotes the generic C implementation, but
+	# some architectures provided optimized implementations of the same
+	# algorithm that may be used instead. In this case, CRYPTO_SHA256 may
+	# be omitted even if SHA-256 is being used.
+	imply CRYPTO_SHA256
+	help
+	  This option enables fs-verity.  fs-verity is the dm-verity
+	  mechanism implemented at the file level.  On supported
+	  filesystems (currently ext4, f2fs, and btrfs), userspace can
+	  use an ioctl to enable verity for a file, which causes the
+	  filesystem to build a Merkle tree for the file.  The filesystem
+	  will then transparently verify any data read from the file
+	  against the Merkle tree.  The file is also made read-only.
+
+	  This serves as an integrity check, but the availability of the
+	  Merkle tree root hash also allows efficiently supporting
+	  various use cases where normally the whole file would need to
+	  be hashed at once, such as: (a) auditing (logging the file's
+	  hash), or (b) authenticity verification (comparing the hash
+	  against a known good value, e.g. from a digital signature).
+
+	  fs-verity is especially useful on large files where not all
+	  the contents may actually be needed.  Also, fs-verity verifies
+	  data each time it is paged back in, which provides better
+	  protection against malicious disks vs. an ahead-of-time hash.
+
+	  If unsure, say N.
+
+config FS_VERITY_BUILTIN_SIGNATURES
+	bool "FS Verity builtin signature support"
+	depends on FS_VERITY
+	select SYSTEM_DATA_VERIFICATION
+	help
+	  This option adds support for in-kernel verification of
+	  fs-verity builtin signatures.
+
+	  Please take great care before using this feature.  It is not
+	  the only way to do signatures with fs-verity, and the
+	  alternatives (such as userspace signature verification, and
+	  IMA appraisal) can be much better.  For details about the
+	  limitations of this feature, see
+	  Documentation/filesystems/fsverity.rst.
+
+	  If unsure, say N.