CVE-2021-47268

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: typec: tcpm: cancela vdm y state machine hrtimer cuando se cancela el registro del puerto tcpm. Un hrtimer pendiente puede caducar después de que se destruya el kthread_worker del puerto tcpm; consulte el siguiente volcado del kernel cuando se descarga el módulo , solucionelo cancelando los 2 temporizadores. [ 111.517018] No se puede manejar la solicitud de paginación del kernel en la dirección virtual ffff8000118cb880 [ 111.518786] blk_update_request: error de E/S, dev sda, sector 60061185 op 0x0:(LEER) indicadores 0x0 phys_seg 1 prio clase 0 [ 111.526594] Información de cancelación de memoria: [111.526597 ] ESR = 0x96000047 [ 111.526600] EC = 0x25: DABT (EL actual), IL = 32 bits [ 111.526604] SET = 0, FnV = 0 [ 111.526607] EA = 0, S1PTW = 0 [ 111.526610] Información de cancelación de datos: [ 111. 526612 ] ISV = 0, ISS = 0x00000047 [ 111.526615] CM = 0, WnR = 1 [ 111.526619] tabla de intercambio: páginas de 4k, VA de 48 bits, pgdp=0000000041d75000 [ 111.526623 [ffff8000118cb] 880] pgd=10000001bffff003, p4d=10000001bffff003, pudín =10000001bfffe003, pmd=10000001bfffa003, pte=0000000000000000 [111.526642] Error interno: Ups: 96000047 [#1] SMP PREEMPLEO [111.526647] Módulos vinculados en: dwc3_imx8mp dwc3 phy_fsl_imx8mq_usb [última descarga: tcpci] [111.526663] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc4-00927-gebbe9dbd802c-dirty #36 [111.526670] Nombre del hardware: placa NXP i.MX8MPlus EVK (DT) [111.526674] pstate: 800000c5 (Nzcv daIF -PAN -UAO -TCO BTYPE=--) [ 111.526681] pc : queued_spin_lock_slowpath+0x1a0/0x390 [ 111.526695] lr : _raw_spin_lock_irqsave+0x88/0xb4 [ 111.526703] sp : ffff800010003e20 [ 111.526 706] x29: ffff800010003e20 x28: ffff00017f380180 [111.537156] buffer_io_error: 6 devoluciones de llamada suprimidas [111.537162 ] Error de E/S del búfer en dev sda1, bloque lógico 60040704, lectura de página asíncrona [111.539932] x27: ffff00017f3801c0 [111.539938] x26: ffff800010ba2490 x25: 0000000000000000 x24: 00000000000001 [111.543025] blk_update_request: error de E/S, dev sda, sector 60061186 op 0x0:(LEER) banderas 0x0 phys_seg 7 prio clase 0 [ 111.548304] [ 111.548306] x23: 00000000000000c0 x22: ffff0000c2a9f184 x21: ffff00017f380180 [ 111.551 374] Error de E/S del búfer en dev sda1, bloque lógico 60040705, lectura de página asíncrona [111.554499] [111.554503] x20: ffff0000c5f14210 x19: 00000000000000c0 x18: 0000000000000000 [111.557391] Error de E/S del búfer en dev sda1, bloque lógico 60040706, lectura de página asíncrona [111. 561218] [ 111.561222] x17: 0000000000000000 x16: 0000000000000000 x15: 00000000000000000 [ 111.564205] Búfer Error de E/S en dev sda1, bloque lógico 60040707, lectura de página asíncrona [111.570887] x14: 00000000000000f5 x13: 00000000000000001 x12: 0000000000000040 [111.570902] x11: ff0000c05ac6d8 [111.583420] Error de E/S del búfer en dev sda1, bloque lógico 60040708, asíncrono lectura de página [111.588978] x10: 0000000000000000 x9: 0000000000040000 [111.588988] x8: 0000000000000000 [111.597173] Error de E/S del búfer en dev sda1, bloque lógico 6004 0709, lectura de página asíncrona [111.605766] x7: ffff00017f384880 x6: ffff8000118cb880 [111.605777] x5: ffff00017f384880 [111.611094] Error de E/S del búfer en dev sda1, bloque lógico 60040710, lectura de página asíncrona [111.617086] x4: 0000000000000000 x3: ffff0000c2a9f184 [111.617096] 2: ffff8000118cb880 [111.622242] Error de E/S del búfer en dev sda1, bloque lógico 60040711 , lectura de página asíncrona [111.626927] x1: ffff8000118cb880 x0: ffff00017f384888 [111.626938] Seguimiento de llamadas: [111.626942] queued_spin_lock_slowpath+0x1a0/0x390 [111.795809] _queue_work+0x30/0xc0 [ 111.799828] state_machine_timer_handler+0x20/0x30 [ 111.804624] __hrtimer_run_queues+0x140/ 0x1e0 [ 111.808990] hrtimer_interrupt+0xec/0x2c0 [ 111.813004] arch_timer_handler_phys+0x38/0x50 [ 111.817456] handle_percpu_devid_irq+0x88/0x150 [ 111.821991] main_irq+0x80/0xe0 [ 111.826093] gic_handle_irq+0x ---truncado---

In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: cancel vdm and state machine hrtimer when unregister tcpm port A pending hrtimer may expire after the kthread_worker of tcpm port is destroyed, see below kernel dump when do module unload, fix it by cancel the 2 hrtimers. [ 111.517018] Unable to handle kernel paging request at virtual address ffff8000118cb880 [ 111.518786] blk_update_request: I/O error, dev sda, sector 60061185 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 111.526594] Mem abort info: [ 111.526597] ESR = 0x96000047 [ 111.526600] EC = 0x25: DABT (current EL), IL = 32 bits [ 111.526604] SET = 0, FnV = 0 [ 111.526607] EA = 0, S1PTW = 0 [ 111.526610] Data abort info: [ 111.526612] ISV = 0, ISS = 0x00000047 [ 111.526615] CM = 0, WnR = 1 [ 111.526619] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000041d75000 [ 111.526623] [ffff8000118cb880] pgd=10000001bffff003, p4d=10000001bffff003, pud=10000001bfffe003, pmd=10000001bfffa003, pte=0000000000000000 [ 111.526642] Internal error: Oops: 96000047 [#1] PREEMPT SMP [ 111.526647] Modules linked in: dwc3_imx8mp dwc3 phy_fsl_imx8mq_usb [last unloaded: tcpci] [ 111.526663] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc4-00927-gebbe9dbd802c-dirty #36 [ 111.526670] Hardware name: NXP i.MX8MPlus EVK board (DT) [ 111.526674] pstate: 800000c5 (Nzcv daIF -PAN -UAO -TCO BTYPE=--) [ 111.526681] pc : queued_spin_lock_slowpath+0x1a0/0x390 [ 111.526695] lr : _raw_spin_lock_irqsave+0x88/0xb4 [ 111.526703] sp : ffff800010003e20 [ 111.526706] x29: ffff800010003e20 x28: ffff00017f380180 [ 111.537156] buffer_io_error: 6 callbacks suppressed [ 111.537162] Buffer I/O error on dev sda1, logical block 60040704, async page read [ 111.539932] x27: ffff00017f3801c0 [ 111.539938] x26: ffff800010ba2490 x25: 0000000000000000 x24: 0000000000000001 [ 111.543025] blk_update_request: I/O error, dev sda, sector 60061186 op 0x0:(READ) flags 0x0 phys_seg 7 prio class 0 [ 111.548304] [ 111.548306] x23: 00000000000000c0 x22: ffff0000c2a9f184 x21: ffff00017f380180 [ 111.551374] Buffer I/O error on dev sda1, logical block 60040705, async page read [ 111.554499] [ 111.554503] x20: ffff0000c5f14210 x19: 00000000000000c0 x18: 0000000000000000 [ 111.557391] Buffer I/O error on dev sda1, logical block 60040706, async page read [ 111.561218] [ 111.561222] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 111.564205] Buffer I/O error on dev sda1, logical block 60040707, async page read [ 111.570887] x14: 00000000000000f5 x13: 0000000000000001 x12: 0000000000000040 [ 111.570902] x11: ffff0000c05ac6d8 [ 111.583420] Buffer I/O error on dev sda1, logical block 60040708, async page read [ 111.588978] x10: 0000000000000000 x9 : 0000000000040000 [ 111.588988] x8 : 0000000000000000 [ 111.597173] Buffer I/O error on dev sda1, logical block 60040709, async page read [ 111.605766] x7 : ffff00017f384880 x6 : ffff8000118cb880 [ 111.605777] x5 : ffff00017f384880 [ 111.611094] Buffer I/O error on dev sda1, logical block 60040710, async page read [ 111.617086] x4 : 0000000000000000 x3 : ffff0000c2a9f184 [ 111.617096] x2 : ffff8000118cb880 [ 111.622242] Buffer I/O error on dev sda1, logical block 60040711, async page read [ 111.626927] x1 : ffff8000118cb880 x0 : ffff00017f384888 [ 111.626938] Call trace: [ 111.626942] queued_spin_lock_slowpath+0x1a0/0x390 [ 111.795809] kthread_queue_work+0x30/0xc0 [ 111.799828] state_machine_timer_handler+0x20/0x30 [ 111.804624] __hrtimer_run_queues+0x140/0x1e0 [ 111.808990] hrtimer_interrupt+0xec/0x2c0 [ 111.813004] arch_timer_handler_phys+0x38/0x50 [ 111.817456] handle_percpu_devid_irq+0x88/0x150 [ 111.821991] __handle_domain_irq+0x80/0xe0 [ 111.826093] gic_handle_irq+0xc0/0x140 [ 111.829848] el1_irq+0xbc/0x154 [ 111.832991] arch_cpu_idle+0x1c/0x2c [ 111.836572] default_idle_call+0x24/0x6c [ 111.840497] do_idle+0x238/0x2ac [ 1 ---truncated---