Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]drm/meson: explicitly remove aggregate driver at module unload time[EOL][EOL]Because component_master_del wasn't being called when unloading the[EOL]meson_drm module, the aggregate device would linger forever in the global[EOL]aggregate_devices list. That means when unloading and reloading the[EOL]meson_dw_hdmi module, component_add would call into[EOL]try_to_bring_up_aggregate_device and find the unbound meson_drm aggregate[EOL]device.[EOL][EOL]This would in turn dereference some of the aggregate_device's struct[EOL]entries which point to memory automatically freed by the devres API when[EOL]unbinding the aggregate device from meson_drv_unbind, and trigger an[EOL]use-after-free bug:[EOL][EOL][  +0.000014] =============================================================[EOL][  +0.000007] BUG: KASAN: use-after-free in find_components+0x468/0x500[EOL][  +0.000017] Read of size 8 at addr ffff000006731688 by task modprobe/2536[EOL][  +0.000018] CPU: 4 PID: 2536 Comm: modprobe Tainted: G         C O      5.19.0-rc6-lrmbkasan+ #1[EOL][  +0.000010] Hardware name: Hardkernel ODROID-N2Plus (DT)[EOL][  +0.000008] Call trace:[EOL][  +0.000005]  dump_backtrace+0x1ec/0x280[EOL][  +0.000011]  show_stack+0x24/0x80[EOL][  +0.000007]  dump_stack_lvl+0x98/0xd4[EOL][  +0.000010]  print_address_description.constprop.0+0x80/0x520[EOL][  +0.000011]  print_report+0x128/0x260[EOL][  +0.000007]  kasan_report+0xb8/0xfc[EOL][  +0.000007]  __asan_report_load8_noabort+0x3c/0x50[EOL][  +0.000009]  find_components+0x468/0x500[EOL][  +0.000008]  try_to_bring_up_aggregate_device+0x64/0x390[EOL][  +0.000009]  __component_add+0x1dc/0x49c[EOL][  +0.000009]  component_add+0x20/0x30[EOL][  +0.000008]  meson_dw_hdmi_probe+0x28/0x34 [meson_dw_hdmi][EOL][  +0.000013]  platform_probe+0xd0/0x220[EOL][  +0.000008]  really_probe+0x3ac/0xa80[EOL][  +0.000008]  __driver_probe_device+0x1f8/0x400[EOL][  +0.000008]  driver_probe_device+0x68/0x1b0[EOL][  +0.000008]  __driver_attach+0x20c/0x480[EOL][  +0.000009]  bus_for_each_dev+0x114/0x1b0[EOL][  +0.000007]  driver_attach+0x48/0x64[EOL][  +0.000009]  bus_add_driver+0x390/0x564[EOL][  +0.000007]  driver_register+0x1a8/0x3e4[EOL][  +0.000009]  __platform_driver_register+0x6c/0x94[EOL][  +0.000007]  meson_dw_hdmi_platform_driver_init+0x30/0x1000 [meson_dw_hdmi][EOL][  +0.000014]  do_one_initcall+0xc4/0x2b0[EOL][  +0.000008]  do_init_module+0x154/0x570[EOL][  +0.000010]  load_module+0x1a78/0x1ea4[EOL][  +0.000008]  __do_sys_init_module+0x184/0x1cc[EOL][  +0.000008]  __arm64_sys_init_module+0x78/0xb0[EOL][  +0.000008]  invoke_syscall+0x74/0x260[EOL][  +0.000008]  el0_svc_common.constprop.0+0xcc/0x260[EOL][  +0.000009]  do_el0_svc+0x50/0x70[EOL][  +0.000008]  el0_svc+0x68/0x1a0[EOL][  +0.000009]  el0t_64_sync_handler+0x11c/0x150[EOL][  +0.000009]  el0t_64_sync+0x18c/0x190[EOL][EOL][  +0.000014] Allocated by task 902:[EOL][  +0.000007]  kasan_save_stack+0x2c/0x5c[EOL][  +0.000009]  __kasan_kmalloc+0x90/0xd0[EOL][  +0.000007]  __kmalloc_node+0x240/0x580[EOL][  +0.000010]  memcg_alloc_slab_cgroups+0xa4/0x1ac[EOL][  +0.000010]  memcg_slab_post_alloc_hook+0xbc/0x4c0[EOL][  +0.000008]  kmem_cache_alloc_node+0x1d0/0x490[EOL][  +0.000009]  __alloc_skb+0x1d4/0x310[EOL][  +0.000010]  alloc_skb_with_frags+0x8c/0x620[EOL][  +0.000008]  sock_alloc_send_pskb+0x5ac/0x6d0[EOL][  +0.000010]  unix_dgram_sendmsg+0x2e0/0x12f0[EOL][  +0.000010]  sock_sendmsg+0xcc/0x110[EOL][  +0.000007]  sock_write_iter+0x1d0/0x304[EOL][  +0.000008]  new_sync_write+0x364/0x460[EOL][  +0.000007]  vfs_write+0x420/0x5ac[EOL][  +0.000008]  ksys_write+0x19c/0x1f0[EOL][  +0.000008]  __arm64_sys_write+0x78/0xb0[EOL][  +0.000007]  invoke_syscall+0x74/0x260[EOL][  +0.000008]  el0_svc_common.constprop.0+0x1a8/0x260[EOL][  +0.000009]  do_el0_svc+0x50/0x70[EOL][  +0.000007]  el0_svc+0x68/0x1a0[EOL][  +0.000008]  el0t_64_sync_handler+0x11c/0x150[EOL][  +0.000008]  el0t_64_sync+0x18c/0x190[EOL][EOL][  +0.000013] Freed by task 2509:[EOL][  +0.000008]  kasan_save_stack+0x2c/0x5c[EOL][  +0.000007]  kasan_set_track+0x2c/0x40[EOL][  +0.000008]  kasan_set_free_info+0x28/0x50[EOL][  +0.000008]  ____kasan_slab_free+0x128/0x1d4[EOL][  +0.000008]  __kasan_slab_free+0x18/0x24[EOL][  +0.000007]  slab_free_freelist_hook+0x108/0x230[EOL][  +0.000010] [EOL]---truncated---

CVEs

• CVE-2022-50560