| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47271: usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler |
| |
| Patch fixes the following critical issue caused by deadlock which has been |
| detected during testing NCM class: |
| |
| smp: csd: Detected non-responsive CSD lock (#1) on CPU#0 |
| smp: csd: CSD lock (#1) unresponsive. |
| .... |
| RIP: 0010:native_queued_spin_lock_slowpath+0x61/0x1d0 |
| RSP: 0018:ffffbc494011cde0 EFLAGS: 00000002 |
| RAX: 0000000000000101 RBX: ffff9ee8116b4a68 RCX: 0000000000000000 |
| RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9ee8116b4658 |
| RBP: ffffbc494011cde0 R08: 0000000000000001 R09: 0000000000000000 |
| R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 |
| R13: ffff9ee8116b4670 R14: 0000000000000246 R15: ffff9ee8116b4658 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 00007f7bcc41a830 CR3: 000000007a612003 CR4: 00000000001706e0 |
| Call Trace: |
| <IRQ> |
| do_raw_spin_lock+0xc0/0xd0 |
| _raw_spin_lock_irqsave+0x95/0xa0 |
| cdnsp_gadget_ep_queue.cold+0x88/0x107 [cdnsp_udc_pci] |
| usb_ep_queue+0x35/0x110 |
| eth_start_xmit+0x220/0x3d0 [u_ether] |
| ncm_tx_timeout+0x34/0x40 [usb_f_ncm] |
| ? ncm_free_inst+0x50/0x50 [usb_f_ncm] |
| __hrtimer_run_queues+0xac/0x440 |
| hrtimer_run_softirq+0x8c/0xb0 |
| __do_softirq+0xcf/0x428 |
| asm_call_irq_on_stack+0x12/0x20 |
| </IRQ> |
| do_softirq_own_stack+0x61/0x70 |
| irq_exit_rcu+0xc1/0xd0 |
| sysvec_apic_timer_interrupt+0x52/0xb0 |
| asm_sysvec_apic_timer_interrupt+0x12/0x20 |
| RIP: 0010:do_raw_spin_trylock+0x18/0x40 |
| RSP: 0018:ffffbc494138bda8 EFLAGS: 00000246 |
| RAX: 0000000000000000 RBX: ffff9ee8116b4658 RCX: 0000000000000000 |
| RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9ee8116b4658 |
| RBP: ffffbc494138bda8 R08: 0000000000000001 R09: 0000000000000000 |
| R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 |
| R13: ffff9ee8116b4670 R14: ffff9ee7b5c73d80 R15: ffff9ee8116b4000 |
| _raw_spin_lock+0x3d/0x70 |
| ? cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] |
| cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] |
| ? cdnsp_remove_request+0x1f0/0x1f0 [cdnsp_udc_pci] |
| ? cdnsp_thread_irq_handler+0x5/0xa0 [cdnsp_udc_pci] |
| ? irq_thread+0xa0/0x1c0 |
| irq_thread_fn+0x28/0x60 |
| irq_thread+0x105/0x1c0 |
| ? __kthread_parkme+0x42/0x90 |
| ? irq_forced_thread_fn+0x90/0x90 |
| ? wake_threads_waitq+0x30/0x30 |
| ? irq_thread_check_affinity+0xe0/0xe0 |
| kthread+0x12a/0x160 |
| ? kthread_park+0x90/0x90 |
| ret_from_fork+0x22/0x30 |
| |
| The root cause of issue is spin_lock/spin_unlock instruction instead |
| spin_lock_irqsave/spin_lock_irqrestore in cdnsp_thread_irq_handler |
| function. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47271 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.12 with commit 3d82904559f4f5a2622db1b21de3edf2eded7664 and fixed in 5.12.11 with commit ae746b6f4ce619cf4032fd798a232b010907a397 |
| Issue introduced in 5.12 with commit 3d82904559f4f5a2622db1b21de3edf2eded7664 and fixed in 5.13 with commit a9aecef198faae3240921b707bc09b602e966fce |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47271 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/usb/cdns3/cdnsp-ring.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397 |
| https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce |
