CVE-2021-46938
dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
When loading a device-mapper table for a request-based mapped device,
and the allocation/initialization of the blk_mq_tag_set for the device
fails, a following device remove will cause a double free.
E.g. (dmesg):
device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device
device-mapper: ioctl: unable to set up device queue for new table.
Unable to handle kernel pointer dereference in virtual kernel address space
Failing address: 0305e098835de000 TEID: 0305e098835de803
Fault in home space mode while using kernel ASCE.
AS:000000025efe0007 R3:0000000000000024
Oops: 0038 ilc:3 [#1] SMP
Modules linked in: ... lots of modules ...
Supported: Yes, External
CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X 5.3.18-53-default #1 SLE15-SP3
Hardware name: IBM 8561 T01 7I2 (LPAR)
Krnl PSW : 0704e00180000000 000000025e368eca (kfree+0x42/0x330)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000
000000025e520270 000000025e8d1b40 0000000000000003 00000007aae10000
000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640
00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8
Krnl Code: 000000025e368eb8: c4180041e100 lgrl %r1,25eba50b8
000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58
#000000025e368ec4: e3b010000008 ag %r11,0(%r1)
>000000025e368eca: e310b0080004 lg %r1,8(%r11)
000000025e368ed0: a7110001 tmll %r1,1
000000025e368ed4: a7740129 brc 7,25e369126
000000025e368ed8: e320b0080004 lg %r2,8(%r11)
000000025e368ede: b904001b lgr %r1,%r11
Call Trace:
[<000000025e368eca>] kfree+0x42/0x330
[<000000025e5202a2>] blk_mq_free_tag_set+0x72/0xb8
[<000003ff801316a8>] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod]
[<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod]
[<000003ff801233f0>] __dm_destroy+0x150/0x1d0 [dm_mod]
[<000003ff8012bb9a>] dev_remove+0x162/0x1c0 [dm_mod]
[<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod]
[<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38 [dm_mod]
[<000000025e3b11ee>] ksys_ioctl+0xbe/0xe0
[<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40
[<000000025e8c15ac>] system_call+0xd8/0x2c8
Last Breaking-Event-Address:
[<000000025e52029c>] blk_mq_free_tag_set+0x6c/0xb8
Kernel panic - not syncing: Fatal exception: panic_on_oops
When allocation/initialization of the blk_mq_tag_set fails in
dm_mq_init_request_queue(), it is uninitialized/freed, but the pointer
is not reset to NULL; so when dev_remove() later gets into
dm_mq_cleanup_mapped_device() it sees the pointer and tries to
uninitialize and free it again.
Fix this by setting the pointer to NULL in dm_mq_init_request_queue()
error-handling. Also set it to NULL in dm_mq_cleanup_mapped_device().
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: dm rq: corrige la liberación doble de blk_mq_tag_set en dev y se elimina después de que falla la carga de la tabla Al cargar una tabla de mapeador de dispositivos para un dispositivo mapeado basado en solicitudes y la asignación/inicialización de blk_mq_tag_set Si el dispositivo falla, la siguiente eliminación del dispositivo provocará una doble liberación. Por ejemplo, (dmesg): mapeador de dispositivos: núcleo: no se puede inicializar la cola para el dispositivo asignado dm-mq basado en solicitudes mapeador de dispositivos: ioctl: no se puede configurar la cola de dispositivos para una nueva tabla. No se puede manejar la desreferencia del puntero del kernel en el espacio de direcciones virtual del kernel Dirección fallida: 0305e098835de000 TEID: 0305e098835de803 Fallo en el modo de espacio de inicio mientras se usa el kernel ASCE. AS:000000025efe0007 R3:0000000000000024 Ups: 0038 ilc:3 [#1] Módulos SMP vinculados en: ... muchos módulos ... Compatible: Sí, CPU externa: 0 PID: 7348 Comm: multipathd Kdump: cargado Contaminado: GWX 5.3.18-53-default #1 SLE15-SP3 Nombre de hardware: IBM 8561 T01 7I2 (LPAR) Krnl PSW: 0704e00180000000 000000025e368eca (kfree+0x42/0x330) R:0 T:1 IO:1 EX:1 Clave:0 M :1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 00000000000000000 000000025e520270 000000025 e8d1b40 0000000000000003 00000007aae10000 000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640 00000007a8170000 0 00003ff80138650 000000025e5202a2 000003e00396faa8 Código Krnl: 000000025e368eb8: c4180041e100 lgrl % r1,25eba50b8 000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58 #000000025e368ec4: e3b010000008 ag %r11,0(%r1) >000000025e368eca: e310 b0080004 lg %r1,8(%r11) 000000025e368ed0: a7110001 tmll %r1,1 000000025e368ed4: a7740129 brc 7,25e369126 000000025e368ed8: e320b0080004 lg %r2,8(%r11) 000000025e368ede: b904001b lgr %r1,%r11 Seguimiento de llamadas: [<0 00000025e368eca>] kfree+0x42/0x330 [<000000025e5202a2>] blk_mq_free_tag_set+0x72/ 0xb8 [<000003ff801316a8>] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod] [<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod] [<000003ff801233f0>] __dm_destroy+0x1 50/0x1d0 [dm_mod] [<000003ff8012bb9a>] dev_remove+0x162/0x1c0 [dm_mod] [<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod] [<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38 [dm_mod] [<000000025e3b11ee>] ksys_ioctl+0xbe /0xe0 [<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40 [ <000000025e8c15ac>] system_call+0xd8/0x2c8 Última dirección del evento de última hora: [<000000025e52029c>] blk_mq_free_tag_set+0x6c/0xb8 Pánico del kernel: no se sincroniza: excepción grave: pánico_on_oops Cuando la asignación/inicialización de blk_mq_tag_set falla en d m_mq_init_request_queue(), no está inicializado/liberado, pero el puntero no se restablece a NULL; entonces, cuando dev_remove() ingresa más tarde a dm_mq_cleanup_mapped_device(), ve el puntero e intenta desinicializarlo y liberarlo nuevamente. Solucione este problema estableciendo el puntero en NULL en el manejo de errores dm_mq_init_request_queue(). También configúrelo en NULL en dm_mq_cleanup_mapped_device().
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-25 CVE Reserved
- 2024-02-27 CVE Published
- 2024-04-21 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-415: Double Free
CAPEC
References (9)
URL | Tag | Source |
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https://git.kernel.org/stable/c/1c357a1e86a4227a6b6059f2de118ae47659cebc | Vuln. Introduced |
URL | Date | SRC |
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URL | Date | SRC |
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 4.9.269 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 4.9.269" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 4.14.233 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 4.14.233" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 4.19.191 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 4.19.191" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 5.4.118 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 5.4.118" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 5.10.36 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 5.10.36" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 5.11.20 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 5.11.20" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 5.12.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 5.12.3" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.6 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.6 < 5.13" | en |
Affected
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