[ 15.710474][ T128] (udev-worker) (128) used greatest stack depth: 24496 bytes left [ 16.502614][ T265] ================================================================== [ 16.503016][ T265] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.503273][ T265] Read of size 1 at addr ffff888001926720 by task modprobe/265 [ 16.503528][ T265] [ 16.503617][ T265] CPU: 3 UID: 0 PID: 265 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.503623][ T265] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.503625][ T265] Call Trace: [ 16.503627][ T265] [ 16.503628][ T265] dump_stack_lvl+0x82/0xd0 [ 16.503636][ T265] print_address_description.constprop.0+0x2c/0x400 [ 16.503641][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.503645][ T265] print_report+0xb4/0x270 [ 16.503648][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.503651][ T265] ? kasan_addr_to_slab+0x25/0x80 [ 16.503656][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.503659][ T265] kasan_report+0xca/0x100 [ 16.503662][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.503668][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.503671][ T265] __kasan_check_byte+0x3a/0x50 [ 16.503674][ T265] krealloc_noprof+0x3d/0x320 [ 16.503678][ T265] ? execmem_alloc+0xc0/0x240 [ 16.503683][ T265] emit_its_trampoline+0xa5/0x300 [ 16.503687][ T265] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.503693][ T265] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.503696][ T265] apply_retpolines+0xcf/0x550 [ 16.503701][ T265] ? __pfx_apply_retpolines+0x10/0x10 [ 16.503705][ T265] ? __pfx___mutex_lock+0x10/0x10 [ 16.503715][ T265] module_finalize+0x3d5/0x9d0 [ 16.503721][ T265] ? add_kallsyms+0x7bf/0xf40 [ 16.503726][ T265] ? __pfx_module_finalize+0x10/0x10 [ 16.503730][ T265] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.503733][ T265] ? __pfx_swap_ex+0x10/0x10 [ 16.503738][ T265] load_module+0x139a/0x2660 [ 16.503745][ T265] ? __pfx_load_module+0x10/0x10 [ 16.503748][ T265] ? kernel_read_file+0x3f5/0x550 [ 16.503755][ T265] ? kernel_read_file+0x3d0/0x550 [ 16.503759][ T265] ? __pfx_kernel_read_file+0x10/0x10 [ 16.503763][ T265] ? add_chain_cache+0x110/0x370 [ 16.503768][ T265] ? init_module_from_file+0xe9/0x150 [ 16.503771][ T265] init_module_from_file+0xe9/0x150 [ 16.503775][ T265] ? __pfx_init_module_from_file+0x10/0x10 [ 16.503783][ T265] ? idempotent_init_module+0x31a/0x620 [ 16.503786][ T265] ? __lock_release+0x5d/0x170 [ 16.503791][ T265] ? do_raw_spin_unlock+0x58/0x220 [ 16.503795][ T265] idempotent_init_module+0x335/0x620 [ 16.503799][ T265] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.503806][ T265] ? cap_capable+0x94/0x230 [ 16.503813][ T265] __x64_sys_finit_module+0xca/0x150 [ 16.503816][ T265] ? do_syscall_64+0x85/0x380 [ 16.503820][ T265] do_syscall_64+0xc1/0x380 [ 16.503824][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.503828][ T265] RIP: 0033:0x7f841a0dde5d [ 16.503831][ T265] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 9f 1b 00 f7 d8 64 89 01 48 [ 16.503834][ T265] RSP: 002b:00007ffe6d1fc188 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.503838][ T265] RAX: ffffffffffffffda RBX: 0000561955887960 RCX: 00007f841a0dde5d [ 16.503840][ T265] RDX: 0000000000000000 RSI: 00005619375a4a2a RDI: 0000000000000005 [ 16.503842][ T265] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe6d1fc2c0 [ 16.503844][ T265] R10: 0000000000000005 R11: 0000000000000246 R12: 00005619375a4a2a [ 16.503846][ T265] R13: 0000561955887b10 R14: 0000561955887db0 R15: 0000000000000000 [ 16.503852][ T265] [ 16.503853][ T265] [ 16.514382][ T265] Allocated by task 252: [ 16.514511][ T265] kasan_save_stack+0x24/0x50 [ 16.514689][ T265] kasan_save_track+0x14/0x30 [ 16.514864][ T265] __kasan_kmalloc+0x7f/0x90 [ 16.515037][ T265] __kmalloc_noprof+0x1d4/0x470 [ 16.515211][ T265] virtqueue_add_split+0x6a3/0x1920 [ 16.515388][ T265] virtqueue_add_sgs+0x143/0x270 [ 16.515562][ T265] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.515737][ T265] virtio_fs_send_req+0x13a/0x710 [ 16.515908][ T265] __fuse_simple_request+0x22a/0xb50 [ 16.516083][ T265] fuse_readlink_folio+0x20b/0x400 [ 16.516257][ T265] fuse_get_link+0x12d/0x350 [ 16.516429][ T265] pick_link+0x7a2/0x1160 [ 16.516560][ T265] step_into+0x85a/0xfc0 [ 16.516693][ T265] link_path_walk+0x3c2/0xa10 [ 16.516868][ T265] path_lookupat+0x117/0x630 [ 16.517041][ T265] filename_lookup+0x1c4/0x470 [ 16.517211][ T265] vfs_statx+0xaa/0x2e0 [ 16.517343][ T265] vfs_fstatat+0x68/0xa0 [ 16.517473][ T265] __do_sys_newfstatat+0x6a/0xc0 [ 16.517645][ T265] do_syscall_64+0xc1/0x380 [ 16.517819][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.518032][ T265] [ 16.518117][ T265] Freed by task 65: [ 16.518246][ T265] kasan_save_stack+0x24/0x50 [ 16.518422][ T265] kasan_save_track+0x14/0x30 [ 16.518593][ T265] kasan_save_free_info+0x3b/0x60 [ 16.518767][ T265] __kasan_slab_free+0x38/0x50 [ 16.518942][ T265] kfree+0x144/0x320 [ 16.519077][ T265] detach_buf_split+0x48d/0x6f0 [ 16.519249][ T265] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.519483][ T265] virtio_fs_requests_done_work+0x231/0x890 [ 16.519711][ T265] process_one_work+0xe43/0x1660 [ 16.519887][ T265] worker_thread+0x591/0xcf0 [ 16.520061][ T265] kthread+0x37b/0x600 [ 16.520196][ T265] ret_from_fork+0x243/0x320 [ 16.520374][ T265] ret_from_fork_asm+0x1a/0x30 [ 16.520555][ T265] [ 16.520643][ T265] The buggy address belongs to the object at ffff888001926720 [ 16.520643][ T265] which belongs to the cache kmalloc-96 of size 96 [ 16.521064][ T265] The buggy address is located 0 bytes inside of [ 16.521064][ T265] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.521497][ T265] [ 16.521587][ T265] The buggy address belongs to the physical page: [ 16.521798][ T265] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888001926720 pfn:0x1926 [ 16.522142][ T265] flags: 0x80000000000200(workingset|node=0|zone=1) [ 16.522362][ T265] page_type: f5(slab) [ 16.522497][ T265] raw: 0080000000000200 ffff888001042340 ffffea00000abd90 ffffea0000133990 [ 16.522809][ T265] raw: ffff888001926720 000000000010000d 00000000f5000000 0000000000000000 [ 16.523115][ T265] page dumped because: kasan: bad access detected [ 16.523326][ T265] [ 16.523410][ T265] Memory state around the buggy address: [ 16.523576][ T265] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.523828][ T265] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.524079][ T265] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.524326][ T265] ^ [ 16.524493][ T265] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.524741][ T265] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.524991][ T265] ================================================================== [ 16.525412][ T265] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr