Vulnerabilidad en kernel de Linux (CVE-2024-26724)

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net/mlx5: DPLL, corrige el posible uso después de la activación del temporizador de trabajo retrasado después de la liberación. Logré alcanzar el siguiente uso después de la advertencia de la liberación gratuita recientemente: [2169.711665] ======== ==================================================== ======== [2169.714009] ERROR: KASAN: slab-use-after-free en __run_timers.part.0+0x179/0x4c0 [2169.716293] Escritura de tamaño 8 en la dirección ffff88812b326a70 mediante task swapper/4/0 [ 2169.719022] CPU: 4 PID: 0 Comm: swapper/4 No contaminado 6.8.0-rc2jiri+ #2 [2169.720974] Nombre de hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02- prebuilt.qemu.org 01/04/2014 [2169.722457] Seguimiento de llamadas: [2169.722756] [2169.723024] dump_stack_lvl+0x58/0xb0 [2169.723417] print_report+0xc5/0x630 [2169.72 3807] ? __virt_addr_valid+0x126/0x2b0 [ 2169.724268] kasan_report+0xbe/0xf0 [ 2169.724667] ? __run_timers.part.0+0x179/0x4c0 [2169.725116]? __run_timers.part.0+0x179/0x4c0 [2169.725570] __run_timers.part.0+0x179/0x4c0 [2169.726003]? call_timer_fn+0x320/0x320 [2169.726404]? lock_downgrade+0x3a0/0x3a0 [2169.726820]? kvm_clock_get_cycles+0x14/0x20 [2169.727257]? ktime_get+0x92/0x150 [2169.727630]? lapic_next_deadline+0x35/0x60 [ 2169.728069] run_timer_softirq+0x40/0x80 [ 2169.728475] __do_softirq+0x1a1/0x509 [ 2169.728866] irq_exit_rcu+0x95/0xc0 [ 2169.7 29241] sysvec_apic_timer_interrupt+0x6b/0x80 [ 2169.729718] [ 2169.729993] [ 2169.730259] asm_sysvec_apic_timer_interrupt+0x16/0x20 [ 2169.730755] RIP: 0010:default_idle+0x13/0x20 [ 2169.731190] Código: c0 08 00 00 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 72 ff ff ff cc cc cc cc 8b 05 9a 7f 1f 02 85 c0 7e 07 0f 00 2d cf 69 43 00 fb f4 c3 66 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 c0 93 04 00 [ 2169.732759 ] RSP: 0018:ffff888100dbfe10 EFLAGS : 00000242 [ 2169.733264] RAX: 00000000000000001 RBX: ffff888100d9c200 RCX: ffffffff8241bd62 [ 2169.733925] RDX: ffffed109a848b15 RSI: 000000000 0000004 RDI: ffffffff8127ac55 [ 2169.734566] RBP: 0000000000000004 R08: 0000000000000000 R09: ffffed109a848b14 [ 2169.735200] R10: ffff8884d4245 8a3 R11: 000000000000ba7e R12: ffffffff83d7d3a0 [2169.735835] R13: 1ffff110201b7fc6 R14: 0000000000000000 R15: ffff888100d9c200 [2169.736478] ? ct_kernel_exit.constprop.0+0xa2/0xc0 [2169.736954]? do_idle+0x285/0x290 [ 2169.737323] default_idle_call+0x63/0x90 [ 2169.737730] do_idle+0x285/0x290 [ 2169.738089] ? arch_cpu_idle_exit+0x30/0x30 [2169.738511]? mark_held_locks+0x1a/0x80 [2169.738917]? lockdep_hardirqs_on_prepare+0x12e/0x200 [ 2169.739417] cpu_startup_entry+0x30/0x40 [ 2169.739825] start_secondary+0x19a/0x1c0 [ 2169.740229] ? set_cpu_sibling_map+0xbd0/0xbd0 [ 2169.740673] second_startup_64_no_verify+0x15d/0x16b [ 2169.741179] [ 2169.741686] Asignado por la tarea 1098: [ 2169.742058] kasan_save_s tachuela+0x1c/0x40 [ 2169.742456] kasan_save_track+0x10/0x30 [ 2169.742852] __kasan_kmalloc+0x83 /0x90 [ 2169.743246] mlx5_dpll_probe+0xf5/0x3c0 [mlx5_dpll] [ 2169.743730] sonda_bus_auxiliar+0x62/0xb0 [ 2169.744148] sonda_real+0x127/0x590 [ 2169.744534] __driver_probe_device+0xd2/0x200 [ 2169.744973] dispositivo_driver_attach+0x6b/0xf0 [ 2169.745402] bind_store+ 0x90/0xe0 [ 2169.745761] kernfs_fop_write_iter+0x1df/0x2a0 [ 2169.746210] vfs_write+0x41f/0x790 [ 2169.746579] ksys_write+0xc7/0x160 [ 2169.746947 ] do_syscall_64+0x6f/0x140 [ 2169.747333] Entry_SYSCALL_64_after_hwframe+0x46/0x4e [ 2169.748049] Liberado por la tarea 1220 : [ 2169.748393] kasan_save_stack+0x1c/0x40 [ 2169.748789] kasan_save_track+0x10/0x30 [ 2169.749188] kasan_save_free_info+0x3b/0x50 [ 2169.749621] veneno_slab_object+0x106 /0x180 [ 2169.750044] __kasan_slab_free+0x14/0x50 [ 2169.750451] kfree+0x118/0x330 [ 2169.750792] mlx5_dpll_remove+0xf5/0x110 [mlx5_dpll] [ 2169.751271] auxiliar_bus_remove+0x2e/0x40 ---truncado---