Merge tag 'lsm-pr-20261016' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsmstable

Pull lsm updates from Paul Moore:

 - Add LSM hooks, object blobs, and audit records for namespaces

   Add the necessary bits to enable LSMs to enforce access controls on
   the management of various kernel namespaces. While this pull request
   does not contain any in-tree users of these hooks, the Landlock pull
   request for Linux v7.4 will include Landlock support and the next
   merge window will likely include SELinux support as well. Considering
   the development behind these hooks, I expect that BPF LSM developers
   will also be making use of the namespace hooks, if they haven't
   already.

 - Update the inode LSM hooks to include mount idmaps

   This allows LSMs to incorporate the mount ID mapping into their
   access control decisions. While there are no current in-tree users of
   this, it was requested by those developing BPF LSM programs and this
   pull request includes a BPF LSM selftest.

 - Preserve the full 32-bit ioctl command in LSM audit records

   Previously only the low 16 bits were logged, ignoring the direction
   and size information in the upper 16 bits. The pull request also
   includes a Landlock based selftest to verify the full 32-bit ioctl
   value.

 - Ensure we don't call security_backing_file_free() multiple times

   Thankfully we don't have a problem with the current code base, but we
   want to fix this behavior now before it becomes a problem.

 - Clarify that only the current task may access current->cred

   The current code is a bit misleading around safely accessing the cred
   field in a task struct. Through comment and code corrections, this
   pull request clarifies that only the task itself may access its cred
   field.

 - Add SLAB_NO_MERGE to the credential object cache

   Harden the credential cache by ensuring credential objects live on
   dedicated slab pages.

 - Make use of safe memory zero'ing in the LSM Rust bindings

 - Update the docs for the current behavior of /sys/kernel/security/lsm

 - Update the docs for CONFIG_LSM and the "lsm=" command line option

 - Remove unnecessary code

* tag 'lsm-pr-20261016' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
  lsm: remove redundant NULL check in security_init()
  selftests/landlock: Check full ioctl commands in audit records
  lsm: Preserve full ioctl commands in audit records
  doc: fix LSM ordering description for /sys/kernel/security/lsm
  doc: describe CONFIG_LSM and lsm= as the selection mechanism
  selftests/bpf: verify mount idmaps reach inode hooks
  lsm: expose mount idmaps to inode hooks
  rust: lsm: replace `core::mem::zeroed` with `pin_init::zeroed`
  cred: prevent slab cache merging for cred_jar
  lsm: don't call security_backing_file_free() multiple times
  lsm: delete duplicate assignment in lsm_prepare()
  lsm: update the BUILD_BUG_ON() in audit_log_lsm_data()
  lsm: add LSM_AUDIT_DATA_NS for namespace audit records
  lsm: add LSM blob and hooks for namespaces
  ns: Free anonymous mount namespaces via ns_common_free()
  cred: clarify that task_struct::cred is only for the current task

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