[ 13.027054][ T235] ================================================================== [ 13.027421][ T235] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.027693][ T235] Read of size 1 at addr ffff88800192c720 by task modprobe/235 [ 13.027983][ T235] [ 13.028079][ T235] CPU: 3 UID: 0 PID: 235 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.028084][ T235] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.028086][ T235] Call Trace: [ 13.028088][ T235] [ 13.028089][ T235] dump_stack_lvl+0x82/0xd0 [ 13.028097][ T235] print_address_description.constprop.0+0x2c/0x400 [ 13.028104][ T235] ? emit_its_trampoline+0xa5/0x300 [ 13.028107][ T235] print_report+0xb4/0x270 [ 13.028110][ T235] ? emit_its_trampoline+0xa5/0x300 [ 13.028113][ T235] ? kasan_addr_to_slab+0x25/0x80 [ 13.028116][ T235] ? emit_its_trampoline+0xa5/0x300 [ 13.028118][ T235] kasan_report+0xca/0x100 [ 13.028122][ T235] ? emit_its_trampoline+0xa5/0x300 [ 13.028127][ T235] ? emit_its_trampoline+0xa5/0x300 [ 13.028129][ T235] __kasan_check_byte+0x3a/0x50 [ 13.028132][ T235] krealloc_noprof+0x3d/0x320 [ 13.028136][ T235] ? execmem_alloc+0xc0/0x240 [ 13.028141][ T235] emit_its_trampoline+0xa5/0x300 [ 13.028144][ T235] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.028150][ T235] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.028154][ T235] apply_retpolines+0xcf/0x550 [ 13.028158][ T235] ? __pfx_apply_retpolines+0x10/0x10 [ 13.028161][ T235] ? __pfx___mutex_lock+0x10/0x10 [ 13.028172][ T235] module_finalize+0x3d5/0x9d0 [ 13.028178][ T235] ? add_kallsyms+0x7bf/0xf40 [ 13.028183][ T235] ? __pfx_module_finalize+0x10/0x10 [ 13.028187][ T235] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.028190][ T235] ? __pfx_swap_ex+0x10/0x10 [ 13.028195][ T235] load_module+0x139a/0x2660 [ 13.028203][ T235] ? __pfx_load_module+0x10/0x10 [ 13.028206][ T235] ? kernel_read_file+0x3f5/0x550 [ 13.028212][ T235] ? kernel_read_file+0x3d0/0x550 [ 13.028215][ T235] ? __pfx_kernel_read_file+0x10/0x10 [ 13.028218][ T235] ? add_chain_cache+0x110/0x370 [ 13.028224][ T235] ? init_module_from_file+0xe9/0x150 [ 13.028228][ T235] init_module_from_file+0xe9/0x150 [ 13.028231][ T235] ? __pfx_init_module_from_file+0x10/0x10 [ 13.028240][ T235] ? idempotent_init_module+0x31a/0x620 [ 13.028244][ T235] ? __lock_release+0x5d/0x170 [ 13.028249][ T235] ? do_raw_spin_unlock+0x58/0x220 [ 13.028253][ T235] idempotent_init_module+0x335/0x620 [ 13.028257][ T235] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.028265][ T235] ? cap_capable+0x94/0x230 [ 13.028272][ T235] __x64_sys_finit_module+0xca/0x150 [ 13.028275][ T235] ? do_syscall_64+0x85/0x380 [ 13.028279][ T235] do_syscall_64+0xc1/0x380 [ 13.028282][ T235] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.028285][ T235] RIP: 0033:0x7fdca5c23e5d [ 13.028290][ T235] 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 [ 13.028292][ T235] RSP: 002b:00007ffd04742288 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.028297][ T235] RAX: ffffffffffffffda RBX: 0000559a6135f960 RCX: 00007fdca5c23e5d [ 13.028299][ T235] RDX: 0000000000000000 RSI: 0000559a2f8baa2a RDI: 0000000000000005 [ 13.028301][ T235] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffd047423c0 [ 13.028303][ T235] R10: 0000000000000005 R11: 0000000000000246 R12: 0000559a2f8baa2a [ 13.028304][ T235] R13: 0000559a6135fb10 R14: 0000559a6135fdb0 R15: 0000000000000000 [ 13.028311][ T235] [ 13.028312][ T235] [ 13.039560][ T235] Allocated by task 227: [ 13.039699][ T235] kasan_save_stack+0x24/0x50 [ 13.039899][ T235] kasan_save_track+0x14/0x30 [ 13.040084][ T235] __kasan_kmalloc+0x7f/0x90 [ 13.040267][ T235] __kmalloc_noprof+0x1d4/0x470 [ 13.040456][ T235] virtqueue_add_split+0x6a3/0x1920 [ 13.040645][ T235] virtqueue_add_sgs+0x143/0x270 [ 13.040829][ T235] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.041014][ T235] virtio_fs_send_req+0x13a/0x710 [ 13.041198][ T235] __fuse_simple_request+0x22a/0xb50 [ 13.041387][ T235] fuse_readlink_folio+0x20b/0x400 [ 13.041573][ T235] fuse_get_link+0x12d/0x350 [ 13.041755][ T235] pick_link+0x7a2/0x1160 [ 13.041901][ T235] step_into+0x85a/0xfc0 [ 13.042038][ T235] link_path_walk+0x3c2/0xa10 [ 13.042219][ T235] path_openat+0x14d/0x380 [ 13.042416][ T235] do_filp_open+0x1d7/0x420 [ 13.042599][ T235] do_sys_openat2+0xd4/0x160 [ 13.042784][ T235] __x64_sys_openat+0x122/0x1e0 [ 13.042966][ T235] do_syscall_64+0xc1/0x380 [ 13.043149][ T235] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.043392][ T235] [ 13.043484][ T235] Freed by task 51: [ 13.043621][ T235] kasan_save_stack+0x24/0x50 [ 13.043809][ T235] kasan_save_track+0x14/0x30 [ 13.043993][ T235] kasan_save_free_info+0x3b/0x60 [ 13.044175][ T235] __kasan_slab_free+0x38/0x50 [ 13.044358][ T235] kfree+0x144/0x320 [ 13.044498][ T235] detach_buf_split+0x48d/0x6f0 [ 13.044677][ T235] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.044907][ T235] virtio_fs_requests_done_work+0x231/0x890 [ 13.045152][ T235] process_one_work+0xe43/0x1660 [ 13.045338][ T235] worker_thread+0x591/0xcf0 [ 13.045522][ T235] kthread+0x37b/0x600 [ 13.045661][ T235] ret_from_fork+0x243/0x320 [ 13.045845][ T235] ret_from_fork_asm+0x1a/0x30 [ 13.046032][ T235] [ 13.046123][ T235] The buggy address belongs to the object at ffff88800192c720 [ 13.046123][ T235] which belongs to the cache kmalloc-96 of size 96 [ 13.046581][ T235] The buggy address is located 0 bytes inside of [ 13.046581][ T235] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.047023][ T235] [ 13.047116][ T235] The buggy address belongs to the physical page: [ 13.047343][ T235] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.047677][ T235] flags: 0x80000000000000(node=0|zone=1) [ 13.047888][ T235] page_type: f5(slab) [ 13.048032][ T235] raw: 0080000000000000 ffff888001042340 ffffea0000042fd0 ffffea0000049010 [ 13.048363][ T235] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.048696][ T235] page dumped because: kasan: bad access detected [ 13.048924][ T235] [ 13.049025][ T235] Memory state around the buggy address: [ 13.049200][ T235] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.049469][ T235] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.049735][ T235] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.050007][ T235] ^ [ 13.050185][ T235] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.050453][ T235] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.050718][ T235] ================================================================== [ 13.051153][ T235] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr