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6e07889d8f
- 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
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
"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.
Summary:
- 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"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
selftests/arm64: GCS must not leak on a failed clone3
arm64/gcs: release GCS on failed fork
arm64/mm: restrict transparent contpte mappings to valid PTEs
arm_mpam: Release the mon_sel lock on mpam_save_mbwu_state() errors
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| .. | ||
| Kconfig | ||
| Makefile | ||
| mpam_devices.c | ||
| mpam_fb.c | ||
| mpam_internal.h | ||
| mpam_resctrl.c | ||
| test_mpam_devices.c | ||
| test_mpam_resctrl.c | ||