[SRU][M][PATCH 0/1] CVE-2024-26838

[Bethany Jamison]

[Impact]

RDMA/irdma: Fix KASAN issue with tasklet

KASAN testing revealed the following issue assocated with freeing an IRQ.

[50006.466686] Call Trace:
[50006.466691]  <IRQ>
[50006.489538]  dump_stack+0x5c/0x80
[50006.493475]  print_address_description.constprop.6+0x1a/0x150
[50006.499872]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.505742]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.511644]  kasan_report.cold.11+0x7f/0x118
[50006.516572]  ? irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.522473]  irdma_sc_process_ceq+0x483/0x790 [irdma]
[50006.528232]  irdma_process_ceq+0xb2/0x400 [irdma]
[50006.533601]  ? irdma_hw_flush_wqes_callback+0x370/0x370 [irdma]
[50006.540298]  irdma_ceq_dpc+0x44/0x100 [irdma]
[50006.545306]  tasklet_action_common.isra.14+0x148/0x2c0
[50006.551096]  __do_softirq+0x1d0/0xaf8
[50006.555396]  irq_exit_rcu+0x219/0x260
[50006.559670]  irq_exit+0xa/0x20
[50006.563320]  smp_apic_timer_interrupt+0x1bf/0x690
[50006.568645]  apic_timer_interrupt+0xf/0x20
[50006.573341]  </IRQ>

The issue is that a tasklet could be pending on another core racing
the delete of the irq.

Fix by insuring any scheduled tasklet is killed after deleting the
irq.

[Fix]

Noble:	pending
Mantic:	clean cherry-pick from linux-6.6.y
Jammy:	pending
Focal:	not-affected
Bionic:	not-affected
Xenial:	not-affected
Trusty: not-affected

[Test Case]

Compile and boot tested.

[Where problems could occur]

This fix affects those who use the Intel RDMA (Remote Direct Memory Access)
driver, an issue with the fix would be visible to the user via decreased
system performance.

Mike Marciniszyn (1):
  RDMA/irdma: Fix KASAN issue with tasklet

 drivers/infiniband/hw/irdma/hw.c | 7 +++++++
 1 file changed, 7 insertions(+)

-- 
2.34.1