Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

1 files changed, 137 insertions, 0 deletions

diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
new file mode 100644
index 000000000..916d4f2bf
--- /dev/null
+++ b/security/integrity/Kconfig
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+config INTEGRITY
+	bool "Integrity subsystem"
+	depends on SECURITY
+	default y
+	help
+	  This option enables the integrity subsystem, which is comprised
+	  of a number of different components including the Integrity
+	  Measurement Architecture (IMA), Extended Verification Module
+	  (EVM), IMA-appraisal extension, digital signature verification
+	  extension and audit measurement log support.
+
+	  Each of these components can be enabled/disabled separately.
+	  Refer to the individual components for additional details.
+
+if INTEGRITY
+
+config INTEGRITY_SIGNATURE
+	bool "Digital signature verification using multiple keyrings"
+	default n
+	select KEYS
+	select SIGNATURE
+	help
+	  This option enables digital signature verification support
+	  using multiple keyrings. It defines separate keyrings for each
+	  of the different use cases - evm, ima, and modules.
+	  Different keyrings improves search performance, but also allow
+	  to "lock" certain keyring to prevent adding new keys.
+	  This is useful for evm and module keyrings, when keys are
+	  usually only added from initramfs.
+
+config INTEGRITY_ASYMMETRIC_KEYS
+	bool "Enable asymmetric keys support"
+	depends on INTEGRITY_SIGNATURE
+	default n
+	select ASYMMETRIC_KEY_TYPE
+	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
+	select CRYPTO
+	select CRYPTO_RSA
+	select X509_CERTIFICATE_PARSER
+	help
+	  This option enables digital signature verification using
+	  asymmetric keys.
+
+config INTEGRITY_TRUSTED_KEYRING
+	bool "Require all keys on the integrity keyrings be signed"
+	depends on SYSTEM_TRUSTED_KEYRING
+	depends on INTEGRITY_ASYMMETRIC_KEYS
+	default y
+	help
+	   This option requires that all keys added to the .ima and
+	   .evm keyrings be signed by a key on the system trusted
+	   keyring.
+
+config INTEGRITY_PLATFORM_KEYRING
+	bool "Provide keyring for platform/firmware trusted keys"
+	depends on INTEGRITY_ASYMMETRIC_KEYS
+	depends on SYSTEM_BLACKLIST_KEYRING
+	help
+	  Provide a separate, distinct keyring for platform trusted keys, which
+	  the kernel automatically populates during initialization from values
+	  provided by the platform for verifying the kexec'ed kerned image
+	  and, possibly, the initramfs signature.
+
+config INTEGRITY_MACHINE_KEYRING
+	bool "Provide a keyring to which Machine Owner Keys may be added"
+	depends on SECONDARY_TRUSTED_KEYRING
+	depends on INTEGRITY_ASYMMETRIC_KEYS
+	depends on SYSTEM_BLACKLIST_KEYRING
+	depends on LOAD_UEFI_KEYS || LOAD_PPC_KEYS
+	help
+	  If set, provide a keyring to which Machine Owner Keys (MOK) may
+	  be added. This keyring shall contain just MOK keys.  Unlike keys
+	  in the platform keyring, keys contained in the .machine keyring will
+	  be trusted within the kernel.
+
+config INTEGRITY_CA_MACHINE_KEYRING
+	bool "Enforce Machine Keyring CA Restrictions"
+	depends on INTEGRITY_MACHINE_KEYRING
+	default n
+	help
+	  The .machine keyring can be configured to enforce CA restriction
+	  on any key added to it.  By default no restrictions are in place
+	  and all Machine Owner Keys (MOK) are added to the machine keyring.
+	  If enabled only CA keys are added to the machine keyring, all
+	  other MOK keys load into the platform keyring.
+
+config INTEGRITY_CA_MACHINE_KEYRING_MAX
+	bool "Only CA keys without DigitialSignature usage set"
+	depends on INTEGRITY_CA_MACHINE_KEYRING
+	default n
+	help
+	  When selected, only load CA keys are loaded into the machine
+	  keyring that contain the CA bit set along with the keyCertSign
+	  Usage field.  Keys containing the digitialSignature Usage field
+	  will not be loaded. The remaining MOK keys are loaded into the
+	  .platform keyring.
+
+config LOAD_UEFI_KEYS
+	depends on INTEGRITY_PLATFORM_KEYRING
+	depends on EFI
+	def_bool y
+
+config LOAD_IPL_KEYS
+	depends on INTEGRITY_PLATFORM_KEYRING
+	depends on S390
+	def_bool y
+
+config LOAD_PPC_KEYS
+	bool "Enable loading of platform and blacklisted keys for POWER"
+	depends on INTEGRITY_PLATFORM_KEYRING
+	depends on PPC_SECURE_BOOT
+	default y
+	help
+	  Enable loading of keys to the .platform keyring and blacklisted
+	  hashes to the .blacklist keyring for powerpc based platforms.
+
+config INTEGRITY_AUDIT
+	bool "Enables integrity auditing support "
+	depends on AUDIT
+	default y
+	help
+	  In addition to enabling integrity auditing support, this
+	  option adds a kernel parameter 'integrity_audit', which
+	  controls the level of integrity auditing messages.
+	  0 - basic integrity auditing messages (default)
+	  1 - additional integrity auditing messages
+
+	  Additional informational integrity auditing messages would
+	  be enabled by specifying 'integrity_audit=1' on the kernel
+	  command line.
+
+source "security/integrity/ima/Kconfig"
+source "security/integrity/evm/Kconfig"
+
+endif   # if INTEGRITY