[PATCH 0/6] ovl: Add support for fs-verity checking of lowerdata

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This patchset adds support for using fs-verity to validate lowerdata
files by specifying an overlay.verity xattr on the metacopy
files.

This is primarily motivated by the Composefs usecase, where there will
be a read-only EROFS layer that contains redirect into a base data
layer which has fs-verity enabled on all files. However, it is also
useful in general if you want to ensure that the lowerdata files
matches the expected content over time.

This patch series is based on the lazy lowerdata patch series by Amir[1].

I have also added some tests for this feature to xfstests[2].

I'm also CC:ing the fsverity list and maintainers because there is one
(tiny) fsverity change, and there may be interest in this usecase.

[1] https://lore.kernel.org/linux-unionfs/20230412135412.1684197-1-amir73il@xxxxxxxxx/T/#m1bc31eb75dc9dd22204b8f0cfc67bad9b6c785a7
[2] https://github.com/alexlarsson/xfstests/commits/verity-tests

Alexander Larsson (6):
  fsverity: Export fsverity_get_digest
  ovl: Break out ovl_entry_path_real() from ovl_i_path_real()
  ovl: Break out ovl_entry_path_lowerdata() from ovl_path_lowerdata()
  ovl: Add framework for verity support
  ovl: Validate verity xattr when resolving lowerdata
  ovl: Handle verity during copy-up

 Documentation/filesystems/overlayfs.rst |  33 +++++
 fs/overlayfs/Kconfig                    |  14 ++
 fs/overlayfs/copy_up.c                  |  27 ++++
 fs/overlayfs/namei.c                    |  34 +++++
 fs/overlayfs/overlayfs.h                |  11 ++
 fs/overlayfs/ovl_entry.h                |   4 +
 fs/overlayfs/super.c                    |  49 +++++++
 fs/overlayfs/util.c                     | 167 ++++++++++++++++++++++--
 fs/verity/measure.c                     |   1 +
 9 files changed, 332 insertions(+), 8 deletions(-)

-- 
2.39.2




[Index of Archives]     [Linux Filesystems Devel]     [Linux NFS]     [Linux NILFS]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux