[GIT PULL] arm64 fixes for 7.4-rc1

[Catalin Marinas]

Hi Linus,

Here are three fixes that turned up during the merging window: shadow
stack not freed during a failed fork or it is unmapped from parent when
a worker thread exits (same commit covers both); PTE_CONT set on
PROT_NONE entries but subsequently ignored by the unfolding code since
pte_valid() is false (pte_present() is true); an MPAM lock not released
on the error path. Thanks!

The following changes since commit d0de3a73194a250a2e5ffbf1dc604c0bcbb16e8a:

  Merge branch 'for-next/fw-rmi' into for-next/core (2026-10-15 19:09:31 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux tags/arm64-fixes

for you to fetch changes up to f46be4da2cbb17574b5369517a9a1e1b414063b4:

  selftests/arm64: GCS must not leak on a failed clone3 (2026-10-29 20:42:23 +0000)

----------------------------------------------------------------
arm64 fixes:

 - Release the GCS on a failed fork. copy_thread() can allocate a GCS
   for CLONE_VM threads but a later copy_process() failure left the VMA
   in the parent's mm. Implement exit_thread() to free it and stop
   kernel threads and user workers inheriting the parent's GCS
   base/size. Add a kselftest for the clone3() failure case

 - Do not set PTE_CONT on invalid PTEs in contpte_set_ptes(). Batched
   set_ptes() of present-invalid entries (e.g. PROT_NONE) created contpte
   groups that the single-PTE helpers did not unfold, corrupting a
   neighbouring guard marker via test_and_clear_young_ptes()

 - Release the MPAM mon_sel lock on the mpam_save_mbwu_state() error
   paths

----------------------------------------------------------------
Iván Ezequiel Rodriguez (2):
      arm64/gcs: release GCS on failed fork
      selftests/arm64: GCS must not leak on a failed clone3

Ping Li (1):
      arm_mpam: Release the mon_sel lock on mpam_save_mbwu_state() errors

Zhao Gongyi (1):
      arm64/mm: restrict transparent contpte mappings to valid PTEs

 arch/arm64/Kconfig                                 |   1 +
 arch/arm64/include/asm/pgtable.h                   |   3 +
 arch/arm64/kernel/process.c                        |  17 +++
 arch/arm64/mm/contpte.c                            |   4 +-
 drivers/resctrl/mpam_devices.c                     |  12 +-
 tools/testing/selftests/arm64/gcs/.gitignore       |   1 +
 tools/testing/selftests/arm64/gcs/Makefile         |   3 +-
 .../testing/selftests/arm64/gcs/gcs-clone-pidfd.c  | 168 +++++++++++++++++++++
 tools/testing/selftests/arm64/gcs/gcs-locking.c    |  20 ---
 tools/testing/selftests/arm64/gcs/gcs-util.h       |  24 +++
 tools/testing/selftests/arm64/gcs/libc-gcs.c       |  20 ---
 11 files changed, 224 insertions(+), 49 deletions(-)
 create mode 100644 tools/testing/selftests/arm64/gcs/gcs-clone-pidfd.c

-- 
Catalin