In the Linux kernel, the following vulnerability has been resolved: topology: Keep the cpumask unchanged when printing cpumap During fuzz testing, the following warning was discovered: different return values (15 and 11) from vsnprintf("%*pbl ", ...) test:keyward is WARNING in kvasprintf WARNING: CPU: 55 PID: 1168477 at lib/kasprintf.c:30 kvasprintf+0x121/0x130 Call Trace: kvasprintf+0x121/0x130 kasprintf+0xa6/0xe0 bitmap_print_to_buf+0x89/0x100 core_siblings_list_read+0x7e/0xb0 kernfs_file_read_iter+0x15b/0x270 new_sync_read+0x153/0x260 vfs_read+0x215/0x290 ksys_read+0xb9/0x160 do_syscall_64+0x56/0x100 entry_SYSCALL_64_after_hwframe+0x78/0xe2 The call trace shows that kvasprintf() reported this warning during the printing of core_siblings_list. kvasprintf() has several steps: (1) First, calculate the length of the resulting formatted string. (2) Allocate a buffer based on the returned length. (3) Then, perform the actual string formatting. (4) Check whether the lengths of the formatted strings returned in steps (1) and (2) are consistent. If the core_cpumask is modified between steps (1) and (3), the lengths obtained in these two steps may not match. Indeed our test includes cpu hotplugging, which should modify core_cpumask while printing. To fix this issue, cache the cpumask into a temporary variable before calling cpumap_print_{list, cpumask}_to_buf(), to keep it unchanged during the printing process.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: topología: mantener la cpumask sin cambios al imprimir cpumap Durante las pruebas fuzz, se descubrió la siguiente advertencia: diferentes valores de retorno (15 y 11) de vsnprintf("%*pbl ", ...) test:keyward es WARNING en kvasprintf WARNING: CPU: 55 PID: 1168477 en lib/kasprintf.c:30 kvasprintf+0x121/0x130 Seguimiento de llamadas: kvasprintf+0x121/0x130 kasprintf+0xa6/0xe0 bitmap_print_to_buf+0x89/0x100 core_siblings_list_read+0x7e/0xb0 kernfs_file_read_iter+0x15b/0x270 new_sync_read+0x153/0x260 vfs_read+0x215/0x290 ksys_read+0xb9/0x160 do_syscall_64+0x56/0x100 entry_SYSCALL_64_after_hwframe+0x78/0xe2 El seguimiento de la llamada muestra que kvasprintf() informó esta advertencia durante la impresión de core_siblings_list. kvasprintf() tiene varios pasos: (1) Primero, calcule la longitud de la cadena formateada resultante. (2) Asignar un búfer en función de la longitud devuelta. (3) Luego, realice el formateo de la cadena real. (4) Verifique si las longitudes de las cadenas formateadas devueltas en los pasos (1) y (2) son consistentes. Si se modifica core_cpumask entre los pasos (1) y (3), las longitudes obtenidas en estos dos pasos pueden no coincidir. De hecho, nuestra prueba incluye la conexión en caliente de la CPU, que debería modificar core_cpumask durante la impresión. Para solucionar este problema, almacene en caché cpumask en una variable temporal antes de llamar a cpumap_print_{list, cpumask}_to_buf(), para mantenerla sin cambios durante el proceso de impresión.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
NVD-CWE-noinfo
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde1642c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702b70374080> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde166cc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702b70374bc0> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bde165f80> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bdc9f5b80> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bcc9b2f00> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bfc2a4180> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bfc2a78c0> | Operating System |
| linux | linux_kernel | 6.13 | <built-in method update of dict object at 0x702bdc9f5340> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:* |