[ 14.648608][ T247] ================================================================== [ 14.648908][ T247] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 14.649178][ T247] Read of size 1 at addr ffff88800192c720 by task modprobe/247 [ 14.649452][ T247] [ 14.649541][ T247] CPU: 3 UID: 0 PID: 247 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 14.649546][ T247] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.649548][ T247] Call Trace: [ 14.649550][ T247] [ 14.649552][ T247] dump_stack_lvl+0x82/0xd0 [ 14.649564][ T247] print_address_description.constprop.0+0x2c/0x400 [ 14.649572][ T247] ? emit_its_trampoline+0xa5/0x300 [ 14.649576][ T247] print_report+0xb4/0x270 [ 14.649579][ T247] ? emit_its_trampoline+0xa5/0x300 [ 14.649581][ T247] ? kasan_addr_to_slab+0x25/0x80 [ 14.649584][ T247] ? emit_its_trampoline+0xa5/0x300 [ 14.649587][ T247] kasan_report+0xca/0x100 [ 14.649590][ T247] ? emit_its_trampoline+0xa5/0x300 [ 14.649595][ T247] ? emit_its_trampoline+0xa5/0x300 [ 14.649597][ T247] __kasan_check_byte+0x3a/0x50 [ 14.649601][ T247] krealloc_noprof+0x3d/0x320 [ 14.649606][ T247] ? execmem_alloc+0xc0/0x240 [ 14.649612][ T247] emit_its_trampoline+0xa5/0x300 [ 14.649615][ T247] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 14.649623][ T247] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 14.649626][ T247] apply_retpolines+0xcf/0x550 [ 14.649631][ T247] ? __pfx_apply_retpolines+0x10/0x10 [ 14.649634][ T247] ? __pfx___mutex_lock+0x10/0x10 [ 14.649644][ T247] module_finalize+0x3d5/0x9d0 [ 14.649653][ T247] ? add_kallsyms+0x7bf/0xf40 [ 14.649659][ T247] ? __pfx_module_finalize+0x10/0x10 [ 14.649664][ T247] ? __pfx_cmp_ex_sort+0x10/0x10 [ 14.649667][ T247] ? __pfx_swap_ex+0x10/0x10 [ 14.649671][ T247] load_module+0x139a/0x2660 [ 14.649681][ T247] ? __pfx_load_module+0x10/0x10 [ 14.649685][ T247] ? kernel_read_file+0x3f5/0x550 [ 14.649691][ T247] ? kernel_read_file+0x3d0/0x550 [ 14.649695][ T247] ? __pfx_kernel_read_file+0x10/0x10 [ 14.649697][ T247] ? add_chain_cache+0x110/0x370 [ 14.649705][ T247] ? init_module_from_file+0xe9/0x150 [ 14.649709][ T247] init_module_from_file+0xe9/0x150 [ 14.649712][ T247] ? __pfx_init_module_from_file+0x10/0x10 [ 14.649721][ T247] ? idempotent_init_module+0x31a/0x620 [ 14.649725][ T247] ? __lock_release+0x5d/0x170 [ 14.649730][ T247] ? do_raw_spin_unlock+0x58/0x220 [ 14.649735][ T247] idempotent_init_module+0x335/0x620 [ 14.649740][ T247] ? __pfx_idempotent_init_module+0x10/0x10 [ 14.649747][ T247] ? cap_capable+0x94/0x230 [ 14.649756][ T247] __x64_sys_finit_module+0xca/0x150 [ 14.649760][ T247] ? do_syscall_64+0x85/0x380 [ 14.649764][ T247] do_syscall_64+0xc1/0x380 [ 14.649768][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.649772][ T247] RIP: 0033:0x7f0045a05e5d [ 14.649776][ T247] 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 [ 14.649779][ T247] RSP: 002b:00007fff6afc8cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 14.649783][ T247] RAX: ffffffffffffffda RBX: 00005623f7afa960 RCX: 00007f0045a05e5d [ 14.649785][ T247] RDX: 0000000000000000 RSI: 00005623c353ba2a RDI: 0000000000000005 [ 14.649787][ T247] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff6afc8e00 [ 14.649789][ T247] R10: 0000000000000005 R11: 0000000000000246 R12: 00005623c353ba2a [ 14.649791][ T247] R13: 00005623f7afab10 R14: 00005623f7afadb0 R15: 0000000000000000 [ 14.649797][ T247] [ 14.649798][ T247] [ 14.660308][ T247] Allocated by task 243: [ 14.660442][ T247] kasan_save_stack+0x24/0x50 [ 14.660619][ T247] kasan_save_track+0x14/0x30 [ 14.660791][ T247] __kasan_kmalloc+0x7f/0x90 [ 14.660964][ T247] __kmalloc_noprof+0x1d4/0x470 [ 14.661137][ T247] virtqueue_add_split+0x6a3/0x1920 [ 14.661316][ T247] virtqueue_add_sgs+0x143/0x270 [ 14.661488][ T247] virtio_fs_enqueue_req+0x58c/0xfe0 [ 14.661661][ T247] virtio_fs_send_req+0x13a/0x710 [ 14.661833][ T247] __fuse_simple_request+0x22a/0xb50 [ 14.662009][ T247] fuse_readlink_folio+0x20b/0x400 [ 14.662193][ T247] fuse_get_link+0x12d/0x350 [ 14.662366][ T247] pick_link+0x7a2/0x1160 [ 14.662504][ T247] step_into+0x85a/0xfc0 [ 14.662635][ T247] link_path_walk+0x3c2/0xa10 [ 14.662809][ T247] path_lookupat+0x117/0x630 [ 14.662984][ T247] filename_lookup+0x1c4/0x470 [ 14.663158][ T247] vfs_statx+0xaa/0x2e0 [ 14.663293][ T247] vfs_fstatat+0x68/0xa0 [ 14.663423][ T247] __do_sys_newfstatat+0x6a/0xc0 [ 14.663594][ T247] do_syscall_64+0xc1/0x380 [ 14.663768][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.663984][ T247] [ 14.664070][ T247] Freed by task 51: [ 14.664199][ T247] kasan_save_stack+0x24/0x50 [ 14.664374][ T247] kasan_save_track+0x14/0x30 [ 14.664547][ T247] kasan_save_free_info+0x3b/0x60 [ 14.664728][ T247] __kasan_slab_free+0x38/0x50 [ 14.664898][ T247] kfree+0x144/0x320 [ 14.665027][ T247] detach_buf_split+0x48d/0x6f0 [ 14.665198][ T247] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 14.665412][ T247] virtio_fs_requests_done_work+0x231/0x890 [ 14.665625][ T247] process_one_work+0xe43/0x1660 [ 14.665798][ T247] worker_thread+0x591/0xcf0 [ 14.665972][ T247] kthread+0x37b/0x600 [ 14.666104][ T247] ret_from_fork+0x243/0x320 [ 14.666279][ T247] ret_from_fork_asm+0x1a/0x30 [ 14.666453][ T247] [ 14.666538][ T247] The buggy address belongs to the object at ffff88800192c720 [ 14.666538][ T247] which belongs to the cache kmalloc-96 of size 96 [ 14.666949][ T247] The buggy address is located 0 bytes inside of [ 14.666949][ T247] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 14.667369][ T247] [ 14.667457][ T247] The buggy address belongs to the physical page: [ 14.667665][ T247] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 14.667977][ T247] flags: 0x80000000000000(node=0|zone=1) [ 14.668162][ T247] page_type: f5(slab) [ 14.668302][ T247] raw: 0080000000000000 ffff888001042340 ffffea0000257c10 ffffea00002ef4d0 [ 14.668612][ T247] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 14.668914][ T247] page dumped because: kasan: bad access detected [ 14.669126][ T247] [ 14.669212][ T247] Memory state around the buggy address: [ 14.669385][ T247] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 14.669639][ T247] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.669888][ T247] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 14.670139][ T247] ^ [ 14.670304][ T247] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.670557][ T247] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 14.670803][ T247] ================================================================== [ 14.671064][ T247] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr