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Linus Torvalds d639d9fa16 liveupdate: updates for 7.2-rc1 ...

- kho: make memory preservation compatible with deferred initialization of
   the memory map
 
 - luo: add LIVEUPDATE_SESSION_GET_NAME ioctl and parameter verification for
   LIVEUPDATE_IOCTL_CREATE_SESSION ioctl
 
 - luo: documentation updates for liveupdate=on command line option, systemd
   support and the current compatibility status
 
 - luo: remove the fixed limits on the number of files that can be preserved
   within a single session, and the total number of sessions managed by the
   Live Update Orchestrator
 
 - fixes that didn't cut as urgent and were delayed until the merge window:
 
   * reference count incoming File-Lifecycle-Bound (FLB) data so it cannot
     be freed while a subsystem is still using it
 
   * fixes for a TOCTOU race in luo_session_retrieve(), a use-after-free in
     the file finish and unpreserve paths, concurrent session mutations
     during reboot and serialization on preserve_context kexec
 
   * make sure ioctls for incoming LUO sessions are blocked for outgoing
     sessions and vice versa
 
   * make sure KHO scratch size is always aligned by CMA_MIN_ALIGNMENT_BYTES
 
   * fix memblock tests build issue introduced by KHO changes
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Merge tag 'liveupdate-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux

Pull liveupdate updates from Mike Rapoport:
 "Kexec Handover (KHO):

   - make memory preservation compatible with deferred initialization
     of the memory map

  Live Update Orchestrator (LUO):

   - add LIVEUPDATE_SESSION_GET_NAME ioctl and parameter verification
     for LIVEUPDATE_IOCTL_CREATE_SESSION ioctl

   - documentation updates for liveupdate=on command line option,
     systemd support and the current compatibility status

   - remove the fixed limits on the number of files that can be
     preserved within a single session, and the total number of
     sessions managed by the LUO

  Misc fixes:

   - reference count incoming File-Lifecycle-Bound (FLB) data so
     it cannot be freed while a subsystem is still using it

   - fixes for a TOCTOU race in luo_session_retrieve(), a use-
     after-free in the file finish and unpreserve paths, concurrent
     session mutations during reboot and serialization on
     preserve_context kexec

   - make sure ioctls for incoming LUO sessions are blocked for
     outgoing sessions and vice versa

   - make sure KHO scratch size is always aligned by
     CMA_MIN_ALIGNMENT_BYTES

   - fix memblock tests build issue introduced by KHO changes"

* tag 'liveupdate-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux: (36 commits)
  liveupdate: Document that retrieve failure is permanent
  docs: memfd_preservation: fix rendering of ABI documentation
  selftests/liveupdate: Add stress-files kexec test
  selftests/liveupdate: Add stress-sessions kexec test
  selftests/liveupdate: Test session and file limit removal
  liveupdate: Remove limit on the number of files per session
  liveupdate: Remove limit on the number of sessions
  liveupdate: defer session block allocation and physical address setting
  kho: add support for linked-block serialization
  liveupdate: Extract luo_session_deserialize_one helper
  liveupdate: Extract luo_file_deserialize_one helper
  liveupdate: register luo_ser as KHO subtree
  liveupdate: centralize state management into struct luo_ser
  liveupdate: avoid mixing cleanup guards with goto in luo_session_retrieve_fd
  liveupdate: change file_set->count type to u64 for type safety
  liveupdate: Remove unused ser field from struct luo_session
  liveupdate: fix u-a-f in luo_file_unpreserve_files() and luo_file_finish()
  liveupdate: block session mutations during reboot
  liveupdate: fix TOCTOU race in luo_session_retrieve()
  liveupdate: skip serialization for context-preserving kexec
  ...

2026-06-21 09:46:14 -07:00

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