CVE-2023-54288

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: mac80211: fortify the spinlock against deadlock by interrupt<br /> <br /> In the function ieee80211_tx_dequeue() there is a particular locking<br /> sequence:<br /> <br /> begin:<br /> spin_lock(&amp;local-&gt;queue_stop_reason_lock);<br /> q_stopped = local-&gt;queue_stop_reasons[q];<br /> spin_unlock(&amp;local-&gt;queue_stop_reason_lock);<br /> <br /> However small the chance (increased by ftracetest), an asynchronous<br /> interrupt can occur in between of spin_lock() and spin_unlock(),<br /> and the interrupt routine will attempt to lock the same<br /> &amp;local-&gt;queue_stop_reason_lock again.<br /> <br /> This will cause a costly reset of the CPU and the wifi device or an<br /> altogether hang in the single CPU and single core scenario.<br /> <br /> The only remaining spin_lock(&amp;local-&gt;queue_stop_reason_lock) that<br /> did not disable interrupts was patched, which should prevent any<br /> deadlocks on the same CPU/core and the same wifi device.<br /> <br /> This is the probable trace of the deadlock:<br /> <br /> kernel: ================================<br /> kernel: WARNING: inconsistent lock state<br /> kernel: 6.3.0-rc6-mt-20230401-00001-gf86822a1170f #4 Tainted: G W<br /> kernel: --------------------------------<br /> kernel: inconsistent {IN-SOFTIRQ-W} -&gt; {SOFTIRQ-ON-W} usage.<br /> kernel: kworker/5:0/25656 [HC0[0]:SC0[0]:HE1:SE1] takes:<br /> kernel: ffff9d6190779478 (&amp;local-&gt;queue_stop_reason_lock){+.?.}-{2:2}, at: return_to_handler+0x0/0x40<br /> kernel: {IN-SOFTIRQ-W} state was registered at:<br /> kernel: lock_acquire+0xc7/0x2d0<br /> kernel: _raw_spin_lock+0x36/0x50<br /> kernel: ieee80211_tx_dequeue+0xb4/0x1330 [mac80211]<br /> kernel: iwl_mvm_mac_itxq_xmit+0xae/0x210 [iwlmvm]<br /> kernel: iwl_mvm_mac_wake_tx_queue+0x2d/0xd0 [iwlmvm]<br /> kernel: ieee80211_queue_skb+0x450/0x730 [mac80211]<br /> kernel: __ieee80211_xmit_fast.constprop.66+0x834/0xa50 [mac80211]<br /> kernel: __ieee80211_subif_start_xmit+0x217/0x530 [mac80211]<br /> kernel: ieee80211_subif_start_xmit+0x60/0x580 [mac80211]<br /> kernel: dev_hard_start_xmit+0xb5/0x260<br /> kernel: __dev_queue_xmit+0xdbe/0x1200<br /> kernel: neigh_resolve_output+0x166/0x260<br /> kernel: ip_finish_output2+0x216/0xb80<br /> kernel: __ip_finish_output+0x2a4/0x4d0<br /> kernel: ip_finish_output+0x2d/0xd0<br /> kernel: ip_output+0x82/0x2b0<br /> kernel: ip_local_out+0xec/0x110<br /> kernel: igmpv3_sendpack+0x5c/0x90<br /> kernel: igmp_ifc_timer_expire+0x26e/0x4e0<br /> kernel: call_timer_fn+0xa5/0x230<br /> kernel: run_timer_softirq+0x27f/0x550<br /> kernel: __do_softirq+0xb4/0x3a4<br /> kernel: irq_exit_rcu+0x9b/0xc0<br /> kernel: sysvec_apic_timer_interrupt+0x80/0xa0<br /> kernel: asm_sysvec_apic_timer_interrupt+0x1f/0x30<br /> kernel: _raw_spin_unlock_irqrestore+0x3f/0x70<br /> kernel: free_to_partial_list+0x3d6/0x590<br /> kernel: __slab_free+0x1b7/0x310<br /> kernel: kmem_cache_free+0x52d/0x550<br /> kernel: putname+0x5d/0x70<br /> kernel: do_sys_openat2+0x1d7/0x310<br /> kernel: do_sys_open+0x51/0x80<br /> kernel: __x64_sys_openat+0x24/0x30<br /> kernel: do_syscall_64+0x5c/0x90<br /> kernel: entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> kernel: irq event stamp: 5120729<br /> kernel: hardirqs last enabled at (5120729): [] trace_graph_return+0xd6/0x120<br /> kernel: hardirqs last disabled at (5120728): [] trace_graph_return+0xf0/0x120<br /> kernel: softirqs last enabled at (5069900): [] return_to_handler+0x0/0x40<br /> kernel: softirqs last disabled at (5067555): [] return_to_handler+0x0/0x40<br /> kernel:<br /> other info that might help us debug this:<br /> kernel: Possible unsafe locking scenario:<br /> kernel: CPU0<br /> kernel: ----<br /> kernel: lock(&amp;local-&gt;queue_stop_reason_lock);<br /> kernel: <br /> kernel: lock(&amp;local-&gt;queue_stop_reason_lock);<br /> kernel:<br /> *** DEADLOCK ***<br /> kernel: 8 locks held by kworker/5:0/25656:<br /> kernel: #0: ffff9d618009d138 ((wq_completion)events_freezable){+.+.}-{0:0}, at: process_one_work+0x1ca/0x530<br /> kernel: #1: ffffb1ef4637fe68 ((work_completion)(&amp;local-&gt;restart_work)){+.+.}-{0:0}, at: process_one_work+0x1ce/0x530<br /> kernel: #2: ffffffff9f166548 (rtnl_mutex){+.+.}-{3:3}, at: return_to_handler+0x0/0x40<br /> kernel: #3: ffff9d619<br /> ---truncated---