CVE-2021-47562

ice: fix vsi->txq_map sizing

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ice: fix vsi->txq_map sizing

The approach of having XDP queue per CPU regardless of user's setting
exposed a hidden bug that could occur in case when Rx queue count differ
from Tx queue count. Currently vsi->txq_map's size is equal to the
doubled vsi->alloc_txq, which is not correct due to the fact that XDP
rings were previously based on the Rx queue count. Below splat can be
seen when ethtool -L is used and XDP rings are configured:

[ 682.875339] BUG: kernel NULL pointer dereference, address: 000000000000000f
[ 682.883403] #PF: supervisor read access in kernel mode
[ 682.889345] #PF: error_code(0x0000) - not-present page
[ 682.895289] PGD 0 P4D 0
[ 682.898218] Oops: 0000 [#1] PREEMPT SMP PTI
[ 682.903055] CPU: 42 PID: 2878 Comm: ethtool Tainted: G OE 5.15.0-rc5+ #1
[ 682.912214] Hardware name: Intel Corp. GRANTLEY/GRANTLEY, BIOS GRRFCRB1.86B.0276.D07.1605190235 05/19/2016
[ 682.923380] RIP: 0010:devres_remove+0x44/0x130
[ 682.928527] Code: 49 89 f4 55 48 89 fd 4c 89 ff 53 48 83 ec 10 e8 92 b9 49 00 48 8b 9d a8 02 00 00 48 8d 8d a0 02 00 00 49 89 c2 48 39 cb 74 0f <4c> 3b 63 10 74 25 48 8b 5b 08 48 39 cb 75 f1 4c 89 ff 4c 89 d6 e8
[ 682.950237] RSP: 0018:ffffc90006a679f0 EFLAGS: 00010002
[ 682.956285] RAX: 0000000000000286 RBX: ffffffffffffffff RCX: ffff88908343a370
[ 682.964538] RDX: 0000000000000001 RSI: ffffffff81690d60 RDI: 0000000000000000
[ 682.972789] RBP: ffff88908343a0d0 R08: 0000000000000000 R09: 0000000000000000
[ 682.981040] R10: 0000000000000286 R11: 3fffffffffffffff R12: ffffffff81690d60
[ 682.989282] R13: ffffffff81690a00 R14: ffff8890819807a8 R15: ffff88908343a36c
[ 682.997535] FS: 00007f08c7bfa740(0000) GS:ffff88a03fd00000(0000) knlGS:0000000000000000
[ 683.006910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 683.013557] CR2: 000000000000000f CR3: 0000001080a66003 CR4: 00000000003706e0
[ 683.021819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 683.030075] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 683.038336] Call Trace:
[ 683.041167] devm_kfree+0x33/0x50
[ 683.045004] ice_vsi_free_arrays+0x5e/0xc0 [ice]
[ 683.050380] ice_vsi_rebuild+0x4c8/0x750 [ice]
[ 683.055543] ice_vsi_recfg_qs+0x9a/0x110 [ice]
[ 683.060697] ice_set_channels+0x14f/0x290 [ice]
[ 683.065962] ethnl_set_channels+0x333/0x3f0
[ 683.070807] genl_family_rcv_msg_doit+0xea/0x150
[ 683.076152] genl_rcv_msg+0xde/0x1d0
[ 683.080289] ? channels_prepare_data+0x60/0x60
[ 683.085432] ? genl_get_cmd+0xd0/0xd0
[ 683.089667] netlink_rcv_skb+0x50/0xf0
[ 683.094006] genl_rcv+0x24/0x40
[ 683.097638] netlink_unicast+0x239/0x340
[ 683.102177] netlink_sendmsg+0x22e/0x470
[ 683.106717] sock_sendmsg+0x5e/0x60
[ 683.110756] __sys_sendto+0xee/0x150
[ 683.114894] ? handle_mm_fault+0xd0/0x2a0
[ 683.119535] ? do_user_addr_fault+0x1f3/0x690
[ 683.134173] __x64_sys_sendto+0x25/0x30
[ 683.148231] do_syscall_64+0x3b/0xc0
[ 683.161992] entry_SYSCALL_64_after_hwframe+0x44/0xae

Fix this by taking into account the value that num_possible_cpus()
yields in addition to vsi->alloc_txq instead of doubling the latter.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ice: corregir el tamaño de vsi->txq_map El enfoque de tener una cola XDP por CPU independientemente de la configuración del usuario expuso un error oculto que podría ocurrir en caso de que el recuento de la cola de Rx difiera del recuento de la cola de Tx . Actualmente, el tamaño de vsi->txq_map es igual al doble de vsi->alloc_txq, lo cual no es correcto debido al hecho de que los anillos XDP se basaban anteriormente en el recuento de colas de Rx. A continuación se puede ver el símbolo cuando se usa ethtool -L y se configuran los anillos XDP: [682.875339] ERROR: desreferencia del puntero NULL del kernel, dirección: 000000000000000f [682.883403] #PF: acceso de lectura del supervisor en modo kernel [682.889345] #PF: error_code( 0x0000) - página no presente [682.895289] PGD 0 P4D 0 [682.898218] Ups: 0000 [#1] PREEMPT SMP PTI [682.903055] CPU: 42 PID: 2878 Comm: ethtool Contaminado: G OE 5.15.0-rc5+ #1 [ 682.912214] Nombre del hardware: Intel Corp. GRANTLEY/GRANTLEY, BIOS GRRFCRB1.86B.0276.D07.1605190235 19/05/2016 [ 682.923380] RIP: 0010:devres_remove+0x44/0x130 [ 682.928527] 49 89 f4 55 48 89 fd 4c 89 ff 53 48 83 ec 10 e8 92 b9 49 00 48 8b 9d a8 02 00 00 48 8d 8d a0 02 00 00 49 89 c2 48 39 cb 74 0f <4c> 3b 63 10 74 25 8 8b 5b 08 48 39 cb 75 f1 4c 89 ff 4c 89 d6 e8 [ 682.950237] RSP: 0018:ffffc90006a679f0 EFLAGS: 00010002 [ 682.956285] RAX: 0000000000000286 RBX: RCX: ffff88908343a370 [ 682.964538] RDX: 0000000000000001 RSI: ffffffff81690d60 RDI: 0000000000000000 [ 682.972789] RBP : ffff88908343a0d0 R08: 0000000000000000 R09: 0000000000000000 [ 682.981040] R10: 00000000000000286 R11: 3ffffffffffffffff R12: ffffffff81690d60 [ 682.989282] R13: ffffffff81690a00 R14: ffff8890819807a8 R15: ffff88908343a36c [ 682.997535] FS: 00007f08c7bfa740(0000) GS:ffff88a03fd00000(0 000) knlGS:0000000000000000 [ 683.006910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 683.013557] CR2: 0000000000000000f CR3: 0000001080a66003 CR4: 06e0 [ 683.021819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 683.030075] DR3: 0000000000000000 DR6: 0ff0DR7: 0000000000000400 [683.038336] Seguimiento de llamadas: [683.041167] devm_kfree+0x33/0x50 [683.045004] ice_vsi_free_arrays+0x5e/0xc0 [ice] [683.050380] 8/0x750 [hielo] [683.055543] ice_vsi_recfg_qs+0x9a/0x110 [hielo] [683.060697 ] ice_set_channels+0x14f/0x290 [ice] [ 683.065962] ethnl_set_channels+0x333/0x3f0 [ 683.070807] genl_family_rcv_msg_doit+0xea/0x150 [ 683.076152] 1d0 [683.080289] ? canales_prepare_data+0x60/0x60 [683.085432]? genl_get_cmd+0xd0/0xd0 [ 683.089667] netlink_rcv_skb+0x50/0xf0 [ 683.094006] genl_rcv+0x24/0x40 [ 683.097638] netlink_unicast+0x239/0x340 [ 683.102177] endmsg+0x22e/0x470 [ 683.106717] sock_sendmsg+0x5e/0x60 [ 683.110756] __sys_sendto+ 0xee/0x150 [683.114894] ? handle_mm_fault+0xd0/0x2a0 [683.119535]? do_user_addr_fault+0x1f3/0x690 [ 683.134173] __x64_sys_sendto+0x25/0x30 [ 683.148231] do_syscall_64+0x3b/0xc0 [ 683.161992] Entry_SYSCALL_64_after_hwframe+0x44/ 0xae Solucione este problema teniendo en cuenta el valor que arroja num_possible_cpus() produce además de vsi->alloc_txq en lugar de duplicar este último.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-24 CVE Reserved
2024-05-24 CVE Published
2024-05-25 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source
https://git.kernel.org/stable/c/efc2214b6047b6f5b4ca53151eba62521b9452d6	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/1eb5395add786613c7c5579d3947aa0b8f0ec241	2021-12-01
https://git.kernel.org/stable/c/992ba40a67638dfe2772b84dfc8168dc328d5c4c	2021-12-01
https://git.kernel.org/stable/c/792b2086584f25d84081a526beee80d103c2a913	2021-11-22

URL	Date	SRC

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"				>= 5.5 < 5.10.83 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.10.83"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.15.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.15.6"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.16"		en		Affected