From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- fs/verity/Kconfig | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 fs/verity/Kconfig (limited to 'fs/verity/Kconfig') diff --git a/fs/verity/Kconfig b/fs/verity/Kconfig new file mode 100644 index 000000000..b20882963 --- /dev/null +++ b/fs/verity/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 + +config FS_VERITY + bool "FS Verity (read-only file-based authenticity protection)" + # Filesystems cache the Merkle tree at a 64K aligned offset in the + # pagecache. That approach assumes the page size is at most 64K. + depends on PAGE_SHIFT <= 16 + select CRYPTO_HASH_INFO + select CRYPTO_LIB_SHA256 + select CRYPTO_LIB_SHA512 + 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. -- cgit v1.3.1