LSM stacking and AppArmor refresh for 6.2 kernel

[Andrea Righi]

[Impact]

Refresh LSM stacking and AppArmor patch sets in linux 6.2. These patches are required to properly support the new Apparmor features in Ubuntu.

[Test case]

Run Apparmor test cases included in our QA regression testing suite.

[Fix]

Patch set shared in the kernel-team mailing list:
https://lists.ubuntu.com/archives/kernel-team/2023-March/137842.html

[Regression potential]

We need to properly review Apparmor stress tests after applying this patch set to make sure it doesn't introduce regressions.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 2012136

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 6.2.0-19.19

---------------
linux (6.2.0-19.19) lunar; urgency=medium

  * lunar/linux: 6.2.0-19.19 -proposed tracker (LP: #2012488)

  * Neuter signing tarballs (LP: #2012776)
    - [Packaging] neuter the signing tarball

  * LSM stacking and AppArmor refresh for 6.2 kernel (LP: #2012136)
    - Revert "UBUNTU: [Config] define CONFIG_SECURITY_APPARMOR_RESTRICT_USERNS"
    - Revert "UBUNTU: SAUCE: apparmor: add user namespace creation mediation"
    - Revert "UBUNTU: SAUCE: apparmor: Add fine grained mediation of posix
      mqueues"
    - Revert "UBUNTU: SAUCE: Revert "apparmor: make __aa_path_perm() static""
    - Revert "UBUNTU: SAUCE: LSM: Specify which LSM to display (using struct cred
      as input)"
    - Revert "UBUNTU: SAUCE: apparmor: Fix build error, make sk parameter const"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in smk_netlbl_mls()"
    - Revert "UBUNTU: SAUCE: LSM: change ima_read_file() to use lsmblob"
    - Revert "UBUNTU: SAUCE: apparmor: rename kzfree() to kfree_sensitive()"
    - Revert "UBUNTU: SAUCE: AppArmor: Remove the exclusive flag"
    - Revert "UBUNTU: SAUCE: LSM: Add /proc attr entry for full LSM context"
    - Revert "UBUNTU: SAUCE: Audit: Fix incorrect static inline function
      declration."
    - Revert "UBUNTU: SAUCE: Audit: Fix for missing NULL check"
    - Revert "UBUNTU: SAUCE: Audit: Add a new record for multiple object LSM
      attributes"
    - Revert "UBUNTU: SAUCE: Audit: Add new record for multiple process LSM
      attributes"
    - Revert "UBUNTU: SAUCE: NET: Store LSM netlabel data in a lsmblob"
    - Revert "UBUNTU: SAUCE: LSM: security_secid_to_secctx in netlink netfilter"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmcontext in security_inode_getsecctx"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmcontext in security_secid_to_secctx"
    - Revert "UBUNTU: SAUCE: LSM: Ensure the correct LSM context releaser"
    - Revert "UBUNTU: SAUCE: LSM: Specify which LSM to display"
    - Revert "UBUNTU: SAUCE: IMA: Change internal interfaces to use lsmblobs"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_cred_getsecid"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_inode_getsecid"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_task_getsecid"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_ipc_getsecid"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_secid_to_secctx"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_secctx_to_secid"
    - Revert "UBUNTU: SAUCE: net: Prepare UDS for security module stacking"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_kernel_act_as"
    - Revert "UBUNTU: SAUCE: LSM: Use lsmblob in security_audit_rule_match"
    - Revert "UBUNTU: SAUCE: LSM: Create and manage the lsmblob data structure."
    - Revert "UBUNTU: SAUCE: LSM: Infrastructure management of the sock security"
    - Revert "UBUNTU: SAUCE: apparmor: LSM stacking: switch from SK_CTX() to
      aa_sock()"
    - Revert "UBUNTU: SAUCE: apparmor: rename aa_sock() to aa_unix_sk()"
    - Revert "UBUNTU: SAUCE: apparmor: disable showing the mode as part of a secid
      to secctx"
    - Revert "UBUNTU: SAUCE: app...

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-azure/6.2.0-1009.9 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-lunar' to 'verification-done-lunar'. If the problem still exists, change the tag 'verification-needed-lunar' to 'verification-failed-lunar'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!