[ 16.455171][ T265] ================================================================== [ 16.455546][ T265] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.455811][ T265] Read of size 1 at addr ffff888001926720 by task modprobe/265 [ 16.456069][ T265] [ 16.456162][ T265] CPU: 3 UID: 0 PID: 265 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.456167][ T265] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.456169][ T265] Call Trace: [ 16.456171][ T265] [ 16.456173][ T265] dump_stack_lvl+0x82/0xd0 [ 16.456181][ T265] print_address_description.constprop.0+0x2c/0x400 [ 16.456186][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.456190][ T265] print_report+0xb4/0x270 [ 16.456194][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.456197][ T265] ? kasan_addr_to_slab+0x25/0x80 [ 16.456202][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.456205][ T265] kasan_report+0xca/0x100 [ 16.456208][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.456214][ T265] ? emit_its_trampoline+0xa5/0x300 [ 16.456217][ T265] __kasan_check_byte+0x3a/0x50 [ 16.456220][ T265] krealloc_noprof+0x3d/0x320 [ 16.456225][ T265] ? execmem_alloc+0xc0/0x240 [ 16.456229][ T265] emit_its_trampoline+0xa5/0x300 [ 16.456233][ T265] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.456239][ T265] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.456243][ T265] apply_retpolines+0xcf/0x550 [ 16.456248][ T265] ? __pfx_apply_retpolines+0x10/0x10 [ 16.456252][ T265] ? __pfx___mutex_lock+0x10/0x10 [ 16.456262][ T265] module_finalize+0x3d5/0x9d0 [ 16.456268][ T265] ? add_kallsyms+0x7bf/0xf40 [ 16.456274][ T265] ? __pfx_module_finalize+0x10/0x10 [ 16.456278][ T265] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.456281][ T265] ? __pfx_swap_ex+0x10/0x10 [ 16.456286][ T265] load_module+0x139a/0x2660 [ 16.456293][ T265] ? __pfx_load_module+0x10/0x10 [ 16.456296][ T265] ? kernel_read_file+0x3f5/0x550 [ 16.456302][ T265] ? kernel_read_file+0x3d0/0x550 [ 16.456307][ T265] ? __pfx_kernel_read_file+0x10/0x10 [ 16.456311][ T265] ? add_chain_cache+0x110/0x370 [ 16.456316][ T265] ? init_module_from_file+0xe9/0x150 [ 16.456319][ T265] init_module_from_file+0xe9/0x150 [ 16.456323][ T265] ? __pfx_init_module_from_file+0x10/0x10 [ 16.456331][ T265] ? idempotent_init_module+0x31a/0x620 [ 16.456334][ T265] ? __lock_release+0x5d/0x170 [ 16.456338][ T265] ? do_raw_spin_unlock+0x58/0x220 [ 16.456343][ T265] idempotent_init_module+0x335/0x620 [ 16.456347][ T265] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.456354][ T265] ? cap_capable+0x94/0x230 [ 16.456361][ T265] __x64_sys_finit_module+0xca/0x150 [ 16.456364][ T265] ? do_syscall_64+0x85/0x380 [ 16.456369][ T265] do_syscall_64+0xc1/0x380 [ 16.456373][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.456376][ T265] RIP: 0033:0x7f5cfdecae5d [ 16.456380][ 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 [ 16.456383][ T265] RSP: 002b:00007fffef0dd8a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.456387][ T265] RAX: ffffffffffffffda RBX: 00005559cee53960 RCX: 00007f5cfdecae5d [ 16.456389][ T265] RDX: 0000000000000000 RSI: 00005559cc018a2a RDI: 0000000000000005 [ 16.456391][ T265] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fffef0dd9e0 [ 16.456393][ T265] R10: 0000000000000005 R11: 0000000000000246 R12: 00005559cc018a2a [ 16.456395][ T265] R13: 00005559cee53b10 R14: 00005559cee53db0 R15: 0000000000000000 [ 16.456401][ T265] [ 16.456402][ T265] [ 16.467060][ T265] Allocated by task 254: [ 16.467191][ T265] kasan_save_stack+0x24/0x50 [ 16.467371][ T265] kasan_save_track+0x14/0x30 [ 16.467547][ T265] __kasan_kmalloc+0x7f/0x90 [ 16.467725][ T265] __kmalloc_noprof+0x1d4/0x470 [ 16.467903][ T265] virtqueue_add_split+0x6a3/0x1920 [ 16.468087][ T265] virtqueue_add_sgs+0x143/0x270 [ 16.468274][ T265] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.468453][ T265] virtio_fs_send_req+0x13a/0x710 [ 16.468629][ T265] __fuse_simple_request+0x22a/0xb50 [ 16.468811][ T265] fuse_readlink_folio+0x20b/0x400 [ 16.468989][ T265] fuse_get_link+0x12d/0x350 [ 16.469167][ T265] pick_link+0x7a2/0x1160 [ 16.469302][ T265] step_into+0x85a/0xfc0 [ 16.469442][ T265] link_path_walk+0x3c2/0xa10 [ 16.469619][ T265] path_lookupat+0x117/0x630 [ 16.469797][ T265] filename_lookup+0x1c4/0x470 [ 16.469973][ T265] vfs_statx+0xaa/0x2e0 [ 16.470107][ T265] vfs_fstatat+0x68/0xa0 [ 16.470239][ T265] __do_sys_newfstatat+0x6a/0xc0 [ 16.470417][ T265] do_syscall_64+0xc1/0x380 [ 16.470594][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.470814][ T265] [ 16.470903][ T265] Freed by task 201: [ 16.471034][ T265] kasan_save_stack+0x24/0x50 [ 16.471214][ T265] kasan_save_track+0x14/0x30 [ 16.471393][ T265] kasan_save_free_info+0x3b/0x60 [ 16.471571][ T265] __kasan_slab_free+0x38/0x50 [ 16.471753][ T265] kfree+0x144/0x320 [ 16.471888][ T265] detach_buf_split+0x48d/0x6f0 [ 16.472064][ T265] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.472283][ T265] virtio_fs_requests_done_work+0x231/0x890 [ 16.472501][ T265] process_one_work+0xe43/0x1660 [ 16.472679][ T265] worker_thread+0x591/0xcf0 [ 16.472853][ T265] kthread+0x37b/0x600 [ 16.472990][ T265] ret_from_fork+0x243/0x320 [ 16.473169][ T265] ret_from_fork_asm+0x1a/0x30 [ 16.473350][ T265] [ 16.473441][ T265] The buggy address belongs to the object at ffff888001926720 [ 16.473441][ T265] which belongs to the cache kmalloc-96 of size 96 [ 16.473862][ T265] The buggy address is located 0 bytes inside of [ 16.473862][ T265] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.474291][ T265] [ 16.474379][ T265] The buggy address belongs to the physical page: [ 16.474591][ T265] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 16.474903][ T265] flags: 0x80000000000000(node=0|zone=1) [ 16.475085][ T265] page_type: f5(slab) [ 16.475224][ T265] raw: 0080000000000000 ffff888001042340 ffffea000012e250 ffffea00002aa050 [ 16.475549][ T265] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 16.475861][ T265] page dumped because: kasan: bad access detected [ 16.476076][ T265] [ 16.476164][ T265] Memory state around the buggy address: [ 16.476335][ T265] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.476596][ T265] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.476852][ T265] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.477107][ T265] ^ [ 16.477277][ T265] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.477533][ T265] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.477793][ T265] ================================================================== [ 16.478147][ T265] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr