// For flags

CVE-2024-50138

bpf: Use raw_spinlock_t in ringbuf

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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

bpf: Use raw_spinlock_t in ringbuf

The function __bpf_ringbuf_reserve is invoked from a tracepoint, which
disables preemption. Using spinlock_t in this context can lead to a
"sleep in atomic" warning in the RT variant. This issue is illustrated
in the example below:

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 556208, name: test_progs
preempt_count: 1, expected: 0
RCU nest depth: 1, expected: 1
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffd33a5c88ea44>] migrate_enable+0xc0/0x39c
CPU: 7 PID: 556208 Comm: test_progs Tainted: G
Hardware name: Qualcomm SA8775P Ride (DT)
Call trace:
dump_backtrace+0xac/0x130
show_stack+0x1c/0x30
dump_stack_lvl+0xac/0xe8
dump_stack+0x18/0x30
__might_resched+0x3bc/0x4fc
rt_spin_lock+0x8c/0x1a4
__bpf_ringbuf_reserve+0xc4/0x254
bpf_ringbuf_reserve_dynptr+0x5c/0xdc
bpf_prog_ac3d15160d62622a_test_read_write+0x104/0x238
trace_call_bpf+0x238/0x774
perf_call_bpf_enter.isra.0+0x104/0x194
perf_syscall_enter+0x2f8/0x510
trace_sys_enter+0x39c/0x564
syscall_trace_enter+0x220/0x3c0
do_el0_svc+0x138/0x1dc
el0_svc+0x54/0x130
el0t_64_sync_handler+0x134/0x150
el0t_64_sync+0x17c/0x180

Switch the spinlock to raw_spinlock_t to avoid this error.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: uso de raw_spinlock_t en ringbuf La función __bpf_ringbuf_reserve se invoca desde un punto de seguimiento, lo que desactiva la preempción. El uso de spinlock_t en este contexto puede provocar una advertencia de "suspensión en atómico" en la variante RT. Este problema se ilustra en el siguiente ejemplo: ERROR: función de suspensión llamada desde un contexto no válido en kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 556208, name: test_progs preempt_count: 1, expected: 0 Profundidad de anidación de RCU: 1, expected: 1 INFORMACIÓN: lockdep está desactivado. Prelación deshabilitada en: [] migrants_enable+0xc0/0x39c CPU: 7 PID: 556208 Comm: test_progs Contaminado: G Nombre del hardware: Qualcomm SA8775P Ride (DT) Rastreo de llamadas: dump_backtrace+0xac/0x130 show_stack+0x1c/0x30 dump_stack_lvl+0xac/0xe8 dump_stack+0x18/0x30 __might_resched+0x3bc/0x4fc rt_spin_lock+0x8c/0x1a4 __bpf_ringbuf_reserve+0xc4/0x254 bpf_ringbuf_reserve_dynptr+0x5c/0xdc Cambie el bloqueo de giro a raw_spinlock_t para evitar este error.

*Credits: N/A
CVSS Scores
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* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
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Automatable
-
Tech. Impact
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* Organization's Worst-case Scenario
Timeline
  • 2024-10-21 CVE Reserved
  • 2024-11-05 CVE Published
  • 2024-11-09 EPSS Updated
  • 2024-11-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
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"
>= 5.8 < 6.1.115
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.1.115"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.8 < 6.11.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.11.6"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.8 < 6.12
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.8 < 6.12"
en
Affected