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linux-stable/kernel/irq
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dicken.ding 1c7891812d genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after() 
commit b84a8aba80 upstream.

irq_find_at_or_after() dereferences the interrupt descriptor which is
returned by mt_find() while neither holding sparse_irq_lock nor RCU read
lock, which means the descriptor can be freed between mt_find() and the
dereference:

    CPU0                            CPU1
    desc = mt_find()
                                    delayed_free_desc(desc)
    irq_desc_get_irq(desc)

The use-after-free is reported by KASAN:

    Call trace:
     irq_get_next_irq+0x58/0x84
     show_stat+0x638/0x824
     seq_read_iter+0x158/0x4ec
     proc_reg_read_iter+0x94/0x12c
     vfs_read+0x1e0/0x2c8

    Freed by task 4471:
     slab_free_freelist_hook+0x174/0x1e0
     __kmem_cache_free+0xa4/0x1dc
     kfree+0x64/0x128
     irq_kobj_release+0x28/0x3c
     kobject_put+0xcc/0x1e0
     delayed_free_desc+0x14/0x2c
     rcu_do_batch+0x214/0x720

Guard the access with a RCU read lock section.

Fixes: 721255b982 ("genirq: Use a maple tree for interrupt descriptor management")
Signed-off-by: dicken.ding <dicken.ding@mediatek.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240524091739.31611-1-dicken.ding@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-06-16 13:47:46 +02:00
..
Kconfig genirq: Add mechanism to multiplex a single HW IPI 2023-02-05 10:57:55 +00:00
Makefile genirq: Add mechanism to multiplex a single HW IPI 2023-02-05 10:57:55 +00:00
affinity.c genirq/affinity: Move group_cpus_evenly() into lib/ 2023-01-17 18:50:06 +01:00
autoprobe.c
…
chip.c genirq: Prevent nested thread vs synchronize_hardirq() deadlock 2023-07-31 17:24:22 +02:00
cpuhotplug.c genirq/cpuhotplug, x86/vector: Prevent vector leak during CPU offline 2024-06-12 11:13:01 +02:00
debug.h
…
debugfs.c x86/apic/msi: Fix misconfigured non-maskable MSI quirk 2023-11-28 17:19:56 +00:00
devres.c
…
dummychip.c
…
generic-chip.c genirq/generic_chip: Make irq_remove_generic_chip() irqdomain aware 2023-11-28 17:19:59 +00:00
handle.c
…
internals.h genirq: Remove unused extern declaration 2023-07-31 17:27:16 +02:00
ipi-mux.c genirq/ipi-mux: Use irq_domain_alloc_irqs() 2023-02-06 17:21:15 +00:00
ipi.c genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask() 2023-02-20 13:53:41 +01:00
irq_sim.c
…
irqdesc.c genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after() 2024-06-16 13:47:46 +02:00
irqdomain.c irqdomain: Use return value of strreplace() 2023-06-30 11:13:44 +02:00
manage.c kthread: add kthread_stop_put 2024-06-12 11:12:52 +02:00
matrix.c genirq/matrix: Exclude managed interrupts in irq_matrix_allocated() 2023-11-20 11:58:54 +01:00
migration.c
…
msi.c x86/apic/msi: Fix misconfigured non-maskable MSI quirk 2023-11-28 17:19:56 +00:00
pm.c
…
proc.c
…
resend.c genirq: Fix software resend lockup and nested resend 2023-08-26 19:14:31 +02:00
settings.h
…
spurious.c
…
timings.c
…