Pull hardening updates from Kees Cook:

 - Introduce and start using TRAILING_OVERLAP() helper for fixing
   embedded flex array instances (Gustavo A. R. Silva)

 - mux: Convert mux_control_ops to a flex array member in mux_chip
   (Thorsten Blum)

 - string: Group str_has_prefix() and strstarts() (Andy Shevchenko)

 - Remove KCOV instrumentation from __init and __head (Ritesh Harjani,
   Kees Cook)

 - Refactor and rename stackleak feature to support Clang

 - Add KUnit test for seq_buf API

 - Fix KUnit fortify test under LTO

* tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (22 commits)
  sched/task_stack: Add missing const qualifier to end_of_stack()
  kstack_erase: Support Clang stack depth tracking
  kstack_erase: Add -mgeneral-regs-only to silence Clang warnings
  init.h: Disable sanitizer coverage for __init and __head
  kstack_erase: Disable kstack_erase for all of arm compressed boot code
  x86: Handle KCOV __init vs inline mismatches
  arm64: Handle KCOV __init vs inline mismatches
  s390: Handle KCOV __init vs inline mismatches
  arm: Handle KCOV __init vs inline mismatches
  mips: Handle KCOV __init vs inline mismatch
  powerpc/mm/book3s64: Move kfence and debug_pagealloc related calls to __init section
  configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON
  configs/hardening: Enable CONFIG_KSTACK_ERASE
  stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS
  stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth
  stackleak: Rename STACKLEAK to KSTACK_ERASE
  seq_buf: Introduce KUnit tests
  string: Group str_has_prefix() and strstarts()
  kunit/fortify: Add back "volatile" for sizeof() constants
  acpi: nfit: intel: avoid multiple -Wflex-array-member-not-at-end warnings
  ...

In preparation for adding Clang sanitizer coverage stack depth tracking
that can support stack depth callbacks:

- Add the new top-level CONFIG_KSTACK_ERASE option which will be
  implemented either with the stackleak GCC plugin, or with the Clang
  stack depth callback support.
- Rename CONFIG_GCC_PLUGIN_STACKLEAK as needed to CONFIG_KSTACK_ERASE,
  but keep it for anything specific to the GCC plugin itself.
- Rename all exposed "STACKLEAK" names and files to "KSTACK_ERASE" (named
  for what it does rather than what it protects against), but leave as
  many of the internals alone as possible to avoid even more churn.

While here, also split "prev_lowest_stack" into CONFIG_KSTACK_ERASE_METRICS,
since that's the only place it is referenced from.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250717232519.2984886-1-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

Align the naming with the rest of our helpers exposed
outside of core vfs.

Link: https://lore.kernel.org/20250612-work-coredump-massage-v1-9-315c0c34ba94@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Pull tpm updates from Jarkko Sakkinen:
 "This contains a new driver: a TPM FF-A driver.

  FF comes from Firmware Framework, and A comes from Arm's A-profile.
  FF-A is essentially a standard mechanism to communicate with TrustZone
  apps such as TPM.

  Other than that, this includes a pile of fixes and small improvments"

* tag 'tpmdd-next-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd:
  tpm: Make chip->{status,cancel,req_canceled} opt
  MAINTAINERS: TPM DEVICE DRIVER: add missing includes
  tpm: End any active auth session before shutdown
  Documentation: tpm: Add documentation for the CRB FF-A interface
  tpm_crb: Add support for the ARM FF-A start method
  ACPICA: Add start method for ARM FF-A
  tpm_crb: Clean-up and refactor check for idle support
  tpm_crb: ffa_tpm: Implement driver compliant to CRB over FF-A
  tpm/tpm_ftpm_tee: fix struct ftpm_tee_private documentation
  tpm, tpm_tis: Workaround failed command reception on Infineon devices
  tpm, tpm_tis: Fix timeout handling when waiting for TPM status
  tpm: Convert warn to dbg in tpm2_start_auth_session()
  tpm: Lazily flush auth session when getting random data
  tpm: ftpm_tee: remove incorrect of_match_ptr annotation
  tpm: do not start chip while suspended

Add documentation providing details of how the CRB driver interacts with
ARM FF-A.

[jarkko: Fine-tuned the commit message.]

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Stuart Yoder <stuart.yoder@arm.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

Because audit is dedicated to the system administrator, create a new
entry in Documentation/admin-guide/LSM .  Extend other Landlock
documentation's pages with this new one.

Extend UAPI with the new log flags.

Extend the guiding principles with logs.

Cc: Günther Noack <gnoack@google.com>
Cc: Paul Moore <paul@paul-moore.com>
Link: https://lore.kernel.org/r/20250320190717.2287696-29-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

This helper is not used anymore so remove it.

Link: https://lore.kernel.org/r/20241125-work-cred-v2-29-68b9d38bb5b2@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Improve user space and kernel documentation.

Signed-off-by: Daniel Burgener <dburgener@linux.microsoft.com>
Link: https://lore.kernel.org/r/20241015172647.2007644-1-dburgener@linux.microsoft.com
[mic: Extend commit message, reword ptrace restriction as discussed in
the thread]
Signed-off-by: Mickaël Salaün <mic@digikod.net>

Add IPE's admin and developer documentation to the kernel tree.

Co-developed-by: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Deven Bowers <deven.desai@linux.microsoft.com>
Signed-off-by: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Pull documentation updates from Jonathan Corbet:
 "Another not-too-busy cycle for documentation, including:

   - Some build-system changes to detect the variable fonts installed by
     some distributions that can break the PDF build.

   - Various updates and additions to the Spanish, Chinese, Italian, and
     Japanese translations.

   - Update the stable-kernel rules to match modern practice

  ... and the usual array of corrections, updates, and typo fixes"

* tag 'docs-6.10' of git://git.lwn.net/linux: (42 commits)
  cgroup: Add documentation for missing zswap memory.stat
  kernel-doc: Added "*" in $type_constants2 to fix 'make htmldocs' warning.
  docs:core-api: fixed typos and grammar in printk-index page
  Documentation: tracing: Fix spelling mistakes
  docs/zh_CN/rust: Update the translation of quick-start to 6.9-rc4
  docs/zh_CN/rust: Update the translation of general-information to 6.9-rc4
  docs/zh_CN/rust: Update the translation of coding-guidelines to 6.9-rc4
  docs/zh_CN/rust: Update the translation of arch-support to 6.9-rc4
  docs: stable-kernel-rules: fix typo sent->send
  docs/zh_CN: remove two inconsistent spaces
  docs: scripts/check-variable-fonts.sh: Improve commands for detection
  docs: stable-kernel-rules: create special tag to flag 'no backporting'
  docs: stable-kernel-rules: explain use of stable@kernel.org (w/o @vger.)
  docs: stable-kernel-rules: remove code-labels tags and a indention level
  docs: stable-kernel-rules: call mainline by its name and change example
  docs: stable-kernel-rules: reduce redundancy
  docs, kprobes: Add riscv as supported architecture
  Docs: typos/spelling
  docs: kernel_include.py: Cope with docutils 0.21
  docs: ja_JP/howto: Catch up update in v6.8
  ...