"value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog\n\nSyzbot reported [1] crash that happens for following tracing scenario:\n\n - create tracepoint perf event with attr.inherit=1, attach it to the\n process and set bpf program to it\n - attached process forks -> chid creates inherited event\n\n the new child event shares the parent's bpf program and tp_event\n (hence prog_array) which is global for tracepoint\n\n - exit both process and its child -> release both events\n - first perf_event_detach_bpf_prog call will release tp_event->prog_array\n and second perf_event_detach_bpf_prog will crash, because\n tp_event->prog_array is NULL\n\nThe fix makes sure the perf_event_detach_bpf_prog checks prog_array\nis valid before it tries to remove the bpf program from it.\n\n[1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad"
"value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf,perf: Se corrige el acceso no v\u00e1lido a prog_array en perf_event_detach_bpf_prog Syzbot inform\u00f3 [1] un fallo que ocurre en el siguiente escenario de seguimiento: - crear un evento perf de tracepoint con attr.inherit=1, adjuntarlo al proceso y establecerle el programa bpf - el proceso adjunto se bifurca -> chid crea un evento heredado el nuevo evento secundario comparte el programa bpf del padre y tp_event (de ah\u00ed prog_array) que es global para tracepoint - salir tanto del proceso como de su hijo -> liberar ambos eventos - la primera llamada perf_event_detach_bpf_prog liberar\u00e1 tp_event->prog_array y la segunda perf_event_detach_bpf_prog se bloquear\u00e1, porque tp_event->prog_array es NULL La correcci\u00f3n asegura que las comprobaciones perf_event_detach_bpf_prog prog_array es v\u00e1lido antes de intentar eliminar el programa bpf de \u00e9l. [1] https://lore.kernel.org/bpf/Z1MR6dCIKajNS6nU@krava/T/#m91dbf0688221ec7a7fc95e896a7ef9ff93b0b8ad"
