Vulnerabilidad en kernel de Linux (CVE-2022-48633)

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: drm/gma500: Se solucionó el error WARN_ON(lock->magic!= lock) psb_gem_unpin() llama a dma_resv_lock() pero el ww_mutex subyacente es destruido por drm_gem_object_release() mueve drm_gem_object_release() llame a psb_gem_free_object() después de desanclar para corregir la siguiente advertencia: [79.693962] ------------[ cortar aquí ]------------ [ 79.693992] DEBUG_LOCKS_WARN_ON (lock->magic!= lock) [79.694015] ADVERTENCIA: CPU: 0 PID: 240 en kernel/locking/mutex.c:582 __ww_mutex_lock.constprop.0+0x569/0xfb0 [79.694052] Módulos vinculados en: rfcomm snd_seq_dummy snd_hrtimer qrtr bnep ath9k ath9k_common ath9k_hw snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi snd_hda_intel ath3k snd_intel_dspcfg mac80211 snd_intel_sdw_acpi btusb snd_hda_codec btrtl btbcm btintel btmtk bluetooth at24 snd_hda_core snd_hwdep uvcvideo snd_seq libarc4 videobuf2_vmalloc ath videobuf2_memops videobuf2_v4l2 videobuf2_common snd_seq_device videodev acer_wmi intel_powerclamp coretemp mc snd_pcm joydev sparse_keymap pcspkr genérico wmi_bmof cfg80211 i2c_i801 i2c_smbus snd_timer snd r8169 rfkill lpc_ich soundcore acpi_cpufreq zram rtsx_pci_sdmmc mmc_core serio_raw rtsx_pci gma500_gfx(E) video wmi ip6_tables ip_tables i2c_dev fuse [79.694436] CPU: 0 PID: 240 Comm: plymouthd Tainted: GWE 6.0.0-rc3+ 0 [79.694457] Nombre del hardware: Packard Bell puntos s /SJE01_CT, BIOS V1.10 23/07/2013 [ 79.694469] RIP: 0010:__ww_mutex_lock.constprop.0+0x569/0xfb0 [ 79.694496] Código: ff 85 c0 0f 84 15 fb ff ff 8b 05 ca 3c 11 01 85 c0 0f 85 07 fb ff ff 48 c7 c6 30 cb 84 aa 48 c7 c7 a3 e1 82 aa e8 ac 29 f8 ff <0f> 0b e9 ed fa ff ff e8 5b 83 8a ff 85 c0 74 10 44 8b 0d 98 3c 11 [ 79.694513] RSP: 0018:ffffad1dc048bbe0 EFLAGS: 00010282 [ 79.694623] RAX: 0000000000000028 RBX: 00000000000000000 RCX: 000000000000000000000 [ 79 .694636] RDX: 0000000000000001 RSI: ffffffffaa8b0ffc RDI: 00000000ffffffff [ 79.694650] RBP: ffffad1dc048bc80 R08: 0000000000000000 R09: 0 [79.694662] R10 : 0000000000000003 R11: fffffffaad62fe8 R12: ffff9ff302103138 [ 79.694675] R13: ffff9ff306ec8000 R14: ffff9ff307779078 R15: ffff9ff3014c0270 [ 79.694 690] FS: 00007ff1cccf1740(0000) GS:ffff9ff3bc200000(0000) knlGS:0000000000000000 [ 79.694705] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 79.694719] CR2: 0000559ecbcb4420 CR3: 0000000013210000 CR4: 00000000000006f0 [ 79.694734] Seguimiento de llamadas: [ 79.694749] [ 79.694761] ? __programar+0x47f/0x1670 [ 79.694796] ? psb_gem_unpin+0x27/0x1a0 [gma500_gfx] [79.694830]? lock_is_held_type+0xe3/0x140 [79.694864]? ww_mutex_lock+0x38/0xa0 [79.694885]? __cond_resched+0x1c/0x30 [ 79.694902] ww_mutex_lock+0x38/0xa0 [ 79.694925] psb_gem_unpin+0x27/0x1a0 [gma500_gfx] [ 79.694964] psb_gem_unpin+0x199/0x1a0 ma500_gfx] [79.694996] drm_gem_object_release_handle+0x50/0x60 [79.695020]? drm_gem_object_handle_put_unlocked+0xf0/0xf0 [ 79.695042] idr_for_each+0x4b/0xb0 [ 79.695066] ? _raw_spin_unlock_irqrestore+0x30/0x60 [ 79.695095] drm_gem_release+0x1c/0x30 [ 79.695118] drm_file_free.part.0+0x1ea/0x260 [ 79.695150] drm_release+0x6a/0x120 [ 79.695175 ] __fput+0x9f/0x260 [ 79.695203] task_work_run+0x59/0xa0 [ 79.695227] do_exit+0x387/0xbe0 [ 79.695250] ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90 [79.695275]? lockdep_hardirqs_on+0x7d/0x100 [ 79.695304] do_group_exit+0x33/0xb0 [ 79.695331] __x64_sys_exit_group+0x14/0x20 [ 79.695353] do_syscall_64+0x58/0x80 [ 79.69 5376] ? up_read+0x17/0x20 [ 79.695401] ? lock_is_held_type+0xe3/0x140 [79.695429]? asm_exc_page_fault+0x22/0x30 [79.695450]? lockdep_hardirqs_on+0x7d/0x100 [ 79.695473] Entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 79.695493] RIP: 0033:0x7ff1ccefe3f1 [ 79.695516] Código: No se puede acceder a los bytes del código de operación en RIP 0x7ff1ccefe3 c7. [79.695607] RSP: 002b:00007ffed4413378 EFLAGS: ---truncado---