// For flags

CVE-2024-50111

LoongArch: Enable IRQ if do_ale() triggered in irq-enabled context

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:

LoongArch: Enable IRQ if do_ale() triggered in irq-enabled context

Unaligned access exception can be triggered in irq-enabled context such
as user mode, in this case do_ale() may call get_user() which may cause
sleep. Then we will get:

BUG: sleeping function called from invalid context at arch/loongarch/kernel/access-helper.h:7
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 129, name: modprobe
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 UID: 0 PID: 129 Comm: modprobe Tainted: G W 6.12.0-rc1+ #1723
Tainted: [W]=WARN
Stack : 9000000105e0bd48 0000000000000000 9000000003803944 9000000105e08000
9000000105e0bc70 9000000105e0bc78 0000000000000000 0000000000000000
9000000105e0bc78 0000000000000001 9000000185e0ba07 9000000105e0b890
ffffffffffffffff 9000000105e0bc78 73924b81763be05b 9000000100194500
000000000000020c 000000000000000a 0000000000000000 0000000000000003
00000000000023f0 00000000000e1401 00000000072f8000 0000007ffbb0e260
0000000000000000 0000000000000000 9000000005437650 90000000055d5000
0000000000000000 0000000000000003 0000007ffbb0e1f0 0000000000000000
0000005567b00490 0000000000000000 9000000003803964 0000007ffbb0dfec
00000000000000b0 0000000000000007 0000000000000003 0000000000071c1d
...
Call Trace:
[<9000000003803964>] show_stack+0x64/0x1a0
[<9000000004c57464>] dump_stack_lvl+0x74/0xb0
[<9000000003861ab4>] __might_resched+0x154/0x1a0
[<900000000380c96c>] emulate_load_store_insn+0x6c/0xf60
[<9000000004c58118>] do_ale+0x78/0x180
[<9000000003801bc8>] handle_ale+0x128/0x1e0

So enable IRQ if unaligned access exception is triggered in irq-enabled
context to fix it.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: LoongArch: Habilitar IRQ si do_ale() se activa en un contexto habilitado para irq. La excepción de acceso no alineado se puede activar en un contexto habilitado para irq, como el modo de usuario; en este caso, do_ale() puede llamar a get_user(), lo que puede provocar una suspensión. Entonces obtendremos: ERROR: función inactiva llamada desde un contexto no válido en arch/loongarch/kernel/access-helper.h:7 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 129, nombre: modprobe preempt_count: 0, esperado: 0 Profundidad de anidación de RCU: 0, esperado: 0 CPU: 0 UID: 0 PID: 129 Comm: modprobe Contaminado: GW 6.12.0-rc1+ #1723 Contaminado: [W]=WARN Pila: 9000000105e0bd48 0000000000000000 9000000003803944 9000000105e08000 9000000105e0bc70 9000000105e0bc78 000000000000000 0000000000000000 9000000105e0bc78 0000000000000001 9000000185e0ba07 9000000105e0b890 ffffffffffffffff 9000000105e0bc78 73924b81763be05b 9000000100194500 000000000000020c 00000000000000a 0000000000000000 000000000000003 000000000000023f0 000000000000e1401 00000000072f8000 0000007ffbb0e260 0000000000000000 000000000000000 9000000005437650 90000000055d5000 0000000000000000 0000000000000003 0000007ffbb0e1f0 000000000000000 000005567b00490 0000000000000000 9000000003803964 0000007ffbb0dfec 000000000000000b0 0000000000000007 0000000000000003 0000000000071c1d ... Seguimiento de llamadas: [&lt;9000000003803964&gt;] show_stack+0x64/0x1a0 [&lt;9000000004c57464&gt;] dump_stack_lvl+0x74/0xb0 [&lt;9000000003861ab4&gt;] __might_resched+0x154/0x1a0 [&lt;900000000380c96c&gt;] emulate_load_store_insn+0x6c/0xf60 [&lt;9000000004c58118&gt;] do_ale+0x78/0x180 [&lt;9000000003801bc8&gt;] handle_ale+0x128/0x1e0 Entonces habilite IRQ si se activa una excepción de acceso no alineado en un contexto habilitado para irq para solucionarlo.

*Credits: N/A
CVSS Scores
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* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
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Tech. Impact
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* Organization's Worst-case Scenario
Timeline
  • 2024-10-21 CVE Reserved
  • 2024-11-05 CVE Published
  • 2024-11-05 CVE Updated
  • ---------- EPSS 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"
< 6.6.59
Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.59"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.11.6
Search vendor "Linux" for product "Linux Kernel" and version " < 6.11.6"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
< 6.12-rc5
Search vendor "Linux" for product "Linux Kernel" and version " < 6.12-rc5"
en
Affected