CVE-2023-53765

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dm cache: free background tracker&amp;#39;s queued work in btracker_destroy<br /> <br /> Otherwise the kernel can BUG with:<br /> <br /> [ 2245.426978] =============================================================================<br /> [ 2245.435155] BUG bt_work (Tainted: G B W ): Objects remaining in bt_work on __kmem_cache_shutdown()<br /> [ 2245.445233] -----------------------------------------------------------------------------<br /> [ 2245.445233]<br /> [ 2245.454879] Slab 0x00000000b0ce2b30 objects=64 used=2 fp=0x000000000a3c6a4e flags=0x17ffffc0000200(slab|node=0|zone=2|lastcpupid=0x1fffff)<br /> [ 2245.467300] CPU: 7 PID: 10805 Comm: lvm Kdump: loaded Tainted: G B W 6.0.0-rc2 #19<br /> [ 2245.476078] Hardware name: Dell Inc. PowerEdge R7525/0590KW, BIOS 2.5.6 10/06/2021<br /> [ 2245.483646] Call Trace:<br /> [ 2245.486100] <br /> [ 2245.488206] dump_stack_lvl+0x34/0x48<br /> [ 2245.491878] slab_err+0x95/0xcd<br /> [ 2245.495028] __kmem_cache_shutdown.cold+0x31/0x136<br /> [ 2245.499821] kmem_cache_destroy+0x49/0x130<br /> [ 2245.503928] btracker_destroy+0x12/0x20 [dm_cache]<br /> [ 2245.508728] smq_destroy+0x15/0x60 [dm_cache_smq]<br /> [ 2245.513435] dm_cache_policy_destroy+0x12/0x20 [dm_cache]<br /> [ 2245.518834] destroy+0xc0/0x110 [dm_cache]<br /> [ 2245.522933] dm_table_destroy+0x5c/0x120 [dm_mod]<br /> [ 2245.527649] __dm_destroy+0x10e/0x1c0 [dm_mod]<br /> [ 2245.532102] dev_remove+0x117/0x190 [dm_mod]<br /> [ 2245.536384] ctl_ioctl+0x1a2/0x290 [dm_mod]<br /> [ 2245.540579] dm_ctl_ioctl+0xa/0x20 [dm_mod]<br /> [ 2245.544773] __x64_sys_ioctl+0x8a/0xc0<br /> [ 2245.548524] do_syscall_64+0x5c/0x90<br /> [ 2245.552104] ? syscall_exit_to_user_mode+0x12/0x30<br /> [ 2245.556897] ? do_syscall_64+0x69/0x90<br /> [ 2245.560648] ? do_syscall_64+0x69/0x90<br /> [ 2245.564394] entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> [ 2245.569447] RIP: 0033:0x7fe52583ec6b<br /> ...<br /> [ 2245.646771] ------------[ cut here ]------------<br /> [ 2245.651395] kmem_cache_destroy bt_work: Slab cache still has objects when called from btracker_destroy+0x12/0x20 [dm_cache]<br /> [ 2245.651408] WARNING: CPU: 7 PID: 10805 at mm/slab_common.c:478 kmem_cache_destroy+0x128/0x130<br /> <br /> Found using: lvm2-testsuite --only "cache-single-split.sh"<br /> <br /> Ben bisected and found that commit 0495e337b703 ("mm/slab_common:<br /> Deleting kobject in kmem_cache_destroy() without holding<br /> slab_mutex/cpu_hotplug_lock") first exposed dm-cache&amp;#39;s incomplete<br /> cleanup of its background tracker work objects.