CVE-2024-41036

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: ks8851: Fix deadlock with the SPI chip variant<br /> <br /> When SMP is enabled and spinlocks are actually functional then there is<br /> a deadlock with the &amp;#39;statelock&amp;#39; spinlock between ks8851_start_xmit_spi<br /> and ks8851_irq:<br /> <br /> watchdog: BUG: soft lockup - CPU#0 stuck for 27s!<br /> call trace:<br /> queued_spin_lock_slowpath+0x100/0x284<br /> do_raw_spin_lock+0x34/0x44<br /> ks8851_start_xmit_spi+0x30/0xb8<br /> ks8851_start_xmit+0x14/0x20<br /> netdev_start_xmit+0x40/0x6c<br /> dev_hard_start_xmit+0x6c/0xbc<br /> sch_direct_xmit+0xa4/0x22c<br /> __qdisc_run+0x138/0x3fc<br /> qdisc_run+0x24/0x3c<br /> net_tx_action+0xf8/0x130<br /> handle_softirqs+0x1ac/0x1f0<br /> __do_softirq+0x14/0x20<br /> ____do_softirq+0x10/0x1c<br /> call_on_irq_stack+0x3c/0x58<br /> do_softirq_own_stack+0x1c/0x28<br /> __irq_exit_rcu+0x54/0x9c<br /> irq_exit_rcu+0x10/0x1c<br /> el1_interrupt+0x38/0x50<br /> el1h_64_irq_handler+0x18/0x24<br /> el1h_64_irq+0x64/0x68<br /> __netif_schedule+0x6c/0x80<br /> netif_tx_wake_queue+0x38/0x48<br /> ks8851_irq+0xb8/0x2c8<br /> irq_thread_fn+0x2c/0x74<br /> irq_thread+0x10c/0x1b0<br /> kthread+0xc8/0xd8<br /> ret_from_fork+0x10/0x20<br /> <br /> This issue has not been identified earlier because tests were done on<br /> a device with SMP disabled and so spinlocks were actually NOPs.<br /> <br /> Now use spin_(un)lock_bh for TX queue related locking to avoid execution<br /> of softirq work synchronously that would lead to a deadlock.