CVE-2022-50315 in Linux
Resumen
por VulDB • 2026-05-20
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
ata: ahci: Coincidir EM_MAX_SLOTS con SATA_PMP_MAX_PORTS
UBSAN se queja de un índice de matriz fuera de los límites: [ 1.980703] kernel: UBSAN: array-index-out-of-bounds in /build/linux-9H675w/linux-5.15.0/drivers/ata/libahci.c:968:41
[ 1.980709] kernel: index 15 is out of range for type 'ahci_em_priv [8]'
[ 1.980713] kernel: CPU: 0 PID: 209 Comm: scsi_eh_8 Not tainted 5.15.0-25-generic #25-Ubuntu
[ 1.980716] kernel: Hardware name: System manufacturer System Product Name/P5Q3, BIOS 1102 06/11/2010
[ 1.980718] kernel: Call Trace:
[ 1.980721] kernel: <TASK>
[ 1.980723] kernel: show_stack+0x52/0x58
[ 1.980729] kernel: dump_stack_lvl+0x4a/0x5f
[ 1.980734] kernel: dump_stack+0x10/0x12
[ 1.980736] kernel: ubsan_epilogue+0x9/0x45
[ 1.980739] kernel: __ubsan_handle_out_of_bounds.cold+0x44/0x49
[ 1.980742] kernel: ahci_em_init+0x133/0x150 [libahci]
[ 1.980746] kernel: ahci_init_em+0x10/0x30 [libahci]
[ 1.980750] kernel: ahci_init_one+0x103/0x110 [libahci]
[ 1.980754] kernel: ahci_platform_init_host+0x130/0x180 [libahci]
[ 1.980758] kernel: ahci_platform_probe+0x100/0x160 [libahci]
[ 1.980762] kernel: platform_drv_probe+0x50/0xa0
[ 1.980765] kernel: really_probe+0xc1/0x350
[ 1.980768] kernel: _dev_probe+0x40/0x90
[ 1.980771] kernel: driver_probe_device+0x32/0xa0
[ 1.980774] kernel: device_driver_attach+0x57/0x60
[ 1.980777] kernel: __driver_attach+0x89/0x100
[ 1.980780] kernel: ? device_driver_attach+0x60/0x60
[ 1.980783] kernel: ? ahci_do_hardreset+0x180/0x180 [libahci]
[ 1.980787] kernel: ? ahci_stop_engine+0xb0/0xb0 [libahci]
[ 1.980792] kernel: ? ahci_do_softreset+0x290/0x290 [libahci]
[ 1.980795] kernel: ? trace_event_raw_event_ata_eh_link_autopsy_qc+0xe0/0xe0
[ 1.980799] kernel: sata_pmp_eh_recover.isra.0+0x214/0x560
[ 1.980802] kernel: sata_pmp_error_handler+0x23/0x40
[ 1.980806] kernel: ahci_error_handler+0x43/0x80 [libahci]
[ 1.980810] kernel: ata_scsi_port_error_handler+0x2b1/0x600
[ 1.980813] kernel: ata_scsi_error+0x9c/0xd0
[ 1.980817] kernel: scsi_error_handler+0xa1/0x180
[ 1.980820] kernel: ? scsi_unjam_host+0x1c0/0x1c0
[ 1.980823] kernel: kthread+0x12a/0x150
[ 1.980826] kernel: ? set_kthread_struct+0x50/0x50
[ 1.980831] kernel: ret_from_fork+0x22/0x30
[ 1.980831] kernel: </TASK>
Esto ocurre porque sata_pmp_init_links() inicializa link->pmp hasta SATA_PMP_MAX_PORTS mientras que em_priv se declara como una matriz de 8 elementos.
No puedo encontrar el máximo de puertos de Gestión de Cerrajería especificado en la especificación AHCI v1.3.1, pero "12.2.1 Tipo de mensaje LED" establece que "Información del Multiplicador de Puertos" puede utilizar 4 bits, lo que implica que puede admitir hasta 16 puertos. Por lo tanto, utilice SATA_PMP_MAX_PORTS como EM_MAX_SLOTS para resolver el problema.
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