gpio: pch: use raw_spinlock_t for the register lock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74468
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:51 UTC
Updated2026-08-15 13:17:51 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: gpio: pch: use raw_spinlock_t for the register lock pch_irq_type() is registered as the irq_chip .irq_set_type callback and takes chip->spinlock with spin_lock_irqsave(). This callback is reached from __setup_irq() -> __irq_set_trigger() -> chip->irq_set_type() while the caller holds desc->lock, a raw_spinlock_t, with hardirqs disabled. That context is not sleepable, but on PREEMPT_RT a regular spinlock_t is an rtmutex-backed sleeping lock, so acquiring it there is invalid. This was confirmed on a PREEMPT_RT kernel with lockdep (PROVE_RAW_LOCK_NESTING and DEBUG_ATOMIC_SLEEP). A grounded PoC mirrored pch_irq_type()'s locking and drove it through the real genirq carrier irq_set_irq_type() -> __irq_set_trigger() -> chip->irq_set_type(), i.e. the same __irq_set_trigger() edge that __setup_irq() takes for a requested IRQ. With the original spin_lock_irqsave() edge lockdep reported an invalid wait context, immediately followed by: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 95, name: insmod hardirqs last disabled at (3784): _raw_spin_lock_irqsave+0x4f/0x60 rt_spin_lock+0x3a/0x1c0 repro_irq_set_type+0x64/0xa0 [pch_repro] __irq_set_trigger+0x69/0x140 irq_set_irq_type+0x78/0xd0 Switching the mirrored lock to raw_spinlock_t made both splats go away. Convert the register lock to raw_spinlock_t. The same lock also serializes the GPIO direction/value callbacks and the suspend/resume register save/restore, but all of those critical sections only perform MMIO register accesses (ioread32()/iowrite32()) and irq_set_handler_locked(); none of them contain sleepable operations. Keeping this register lock non-sleeping is therefore appropriate for the irqchip callbacks and does not change the GPIO-side locking contract. This is the same class of issue and fix as recently addressed for other GPIO controllers, e.g. commit 286533cb14a3 ("gpio: sch: use raw_spinlock_t in the irq startup path") and commit 90f0109019e6 ("gpio: eic-sprd: use raw_spinlock_t in the irq startup path").

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 38eb18a6f92da886fc1af509d25e8f7a49e23d9a 16da33cb36e663b6967112185e11d00ce8ff957c git Not specified
CNA Linux Linux affected 38eb18a6f92da886fc1af509d25e8f7a49e23d9a ff050589a21967883bb55f6dba42568f8367ad4a git Not specified
CNA Linux Linux affected 38eb18a6f92da886fc1af509d25e8f7a49e23d9a 466ab0c41d5f54f71cee60619d07c4abd0ffd2cd git Not specified
CNA Linux Linux affected 38eb18a6f92da886fc1af509d25e8f7a49e23d9a c0a4ec89fc26e4b679b04f1002c503cb2529acdc git Not specified
CNA Linux Linux affected 38eb18a6f92da886fc1af509d25e8f7a49e23d9a a02b8950d619123da64f69b70fe1dadef217dfe4 git Not specified
CNA Linux Linux affected 3.2 Not specified
CNA Linux Linux unaffected 3.2 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/466ab0c41d5f54f71cee60619d07c4abd0ffd2cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0a4ec89fc26e4b679b04f1002c503cb2529acdc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16da33cb36e663b6967112185e11d00ce8ff957c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a02b8950d619123da64f69b70fe1dadef217dfe4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff050589a21967883bb55f6dba42568f8367ad4a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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