[ 17.628394][ T266] ================================================================== [ 17.628791][ T266] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 17.629092][ T266] Read of size 1 at addr ffff888001926720 by task modprobe/266 [ 17.629376][ T266] [ 17.629475][ T266] CPU: 3 UID: 0 PID: 266 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 17.629481][ T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.629483][ T266] Call Trace: [ 17.629486][ T266] [ 17.629488][ T266] dump_stack_lvl+0x82/0xd0 [ 17.629498][ T266] print_address_description.constprop.0+0x2c/0x400 [ 17.629504][ T266] ? emit_its_trampoline+0xa5/0x300 [ 17.629508][ T266] print_report+0xb4/0x270 [ 17.629511][ T266] ? emit_its_trampoline+0xa5/0x300 [ 17.629514][ T266] ? kasan_addr_to_slab+0x25/0x80 [ 17.629520][ T266] ? emit_its_trampoline+0xa5/0x300 [ 17.629523][ T266] kasan_report+0xca/0x100 [ 17.629526][ T266] ? emit_its_trampoline+0xa5/0x300 [ 17.629532][ T266] ? emit_its_trampoline+0xa5/0x300 [ 17.629535][ T266] __kasan_check_byte+0x3a/0x50 [ 17.629538][ T266] krealloc_noprof+0x3d/0x320 [ 17.629544][ T266] ? execmem_alloc+0xc0/0x240 [ 17.629549][ T266] emit_its_trampoline+0xa5/0x300 [ 17.629552][ T266] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 17.629561][ T266] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 17.629564][ T266] apply_retpolines+0xcf/0x550 [ 17.629569][ T266] ? __pfx_apply_retpolines+0x10/0x10 [ 17.629573][ T266] ? __pfx___mutex_lock+0x10/0x10 [ 17.629584][ T266] module_finalize+0x3d5/0x9d0 [ 17.629591][ T266] ? add_kallsyms+0x7bf/0xf40 [ 17.629598][ T266] ? __pfx_module_finalize+0x10/0x10 [ 17.629602][ T266] ? __pfx_cmp_ex_sort+0x10/0x10 [ 17.629605][ T266] ? __pfx_swap_ex+0x10/0x10 [ 17.629610][ T266] load_module+0x139a/0x2660 [ 17.629618][ T266] ? __pfx_load_module+0x10/0x10 [ 17.629621][ T266] ? kernel_read_file+0x3f5/0x550 [ 17.629629][ T266] ? kernel_read_file+0x3d0/0x550 [ 17.629633][ T266] ? __pfx_kernel_read_file+0x10/0x10 [ 17.629637][ T266] ? add_chain_cache+0x110/0x370 [ 17.629643][ T266] ? init_module_from_file+0xe9/0x150 [ 17.629646][ T266] init_module_from_file+0xe9/0x150 [ 17.629649][ T266] ? __pfx_init_module_from_file+0x10/0x10 [ 17.629658][ T266] ? idempotent_init_module+0x31a/0x620 [ 17.629661][ T266] ? __lock_release+0x5d/0x170 [ 17.629665][ T266] ? do_raw_spin_unlock+0x58/0x220 [ 17.629670][ T266] idempotent_init_module+0x335/0x620 [ 17.629674][ T266] ? __pfx_idempotent_init_module+0x10/0x10 [ 17.629682][ T266] ? cap_capable+0x94/0x230 [ 17.629690][ T266] __x64_sys_finit_module+0xca/0x150 [ 17.629693][ T266] ? do_syscall_64+0x85/0x380 [ 17.629698][ T266] do_syscall_64+0xc1/0x380 [ 17.629702][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.629706][ T266] RIP: 0033:0x7fc4f0948e5d [ 17.629712][ T266] 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 [ 17.629715][ T266] RSP: 002b:00007fffc762b6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 17.629719][ T266] RAX: ffffffffffffffda RBX: 000055f4264dc960 RCX: 00007fc4f0948e5d [ 17.629722][ T266] RDX: 0000000000000000 RSI: 000055f405da8a2a RDI: 0000000000000005 [ 17.629724][ T266] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fffc762b820 [ 17.629726][ T266] R10: 0000000000000005 R11: 0000000000000246 R12: 000055f405da8a2a [ 17.629728][ T266] R13: 000055f4264dcb10 R14: 000055f4264dcdb0 R15: 0000000000000000 [ 17.629735][ T266] [ 17.629736][ T266] [ 17.641508][ T266] Allocated by task 255: [ 17.641657][ T266] kasan_save_stack+0x24/0x50 [ 17.641857][ T266] kasan_save_track+0x14/0x30 [ 17.642052][ T266] __kasan_kmalloc+0x7f/0x90 [ 17.642249][ T266] __kmalloc_noprof+0x1d4/0x470 [ 17.642446][ T266] virtqueue_add_split+0x6a3/0x1920 [ 17.642643][ T266] virtqueue_add_sgs+0x143/0x270 [ 17.642840][ T266] virtio_fs_enqueue_req+0x58c/0xfe0 [ 17.643044][ T266] virtio_fs_send_req+0x13a/0x710 [ 17.643237][ T266] __fuse_simple_request+0x22a/0xb50 [ 17.643439][ T266] fuse_readlink_folio+0x20b/0x400 [ 17.643634][ T266] fuse_get_link+0x12d/0x350 [ 17.643828][ T266] pick_link+0x7a2/0x1160 [ 17.643973][ T266] step_into+0x85a/0xfc0 [ 17.644117][ T266] link_path_walk+0x3c2/0xa10 [ 17.644310][ T266] path_lookupat+0x117/0x630 [ 17.644502][ T266] filename_lookup+0x1c4/0x470 [ 17.644693][ T266] vfs_statx+0xaa/0x2e0 [ 17.644845][ T266] vfs_fstatat+0x68/0xa0 [ 17.644994][ T266] __do_sys_newfstatat+0x6a/0xc0 [ 17.645188][ T266] do_syscall_64+0xc1/0x380 [ 17.645382][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.645620][ T266] [ 17.645717][ T266] Freed by task 23: [ 17.645860][ T266] kasan_save_stack+0x24/0x50 [ 17.646056][ T266] kasan_save_track+0x14/0x30 [ 17.646251][ T266] kasan_save_free_info+0x3b/0x60 [ 17.646443][ T266] __kasan_slab_free+0x38/0x50 [ 17.646637][ T266] kfree+0x144/0x320 [ 17.646784][ T266] detach_buf_split+0x48d/0x6f0 [ 17.646977][ T266] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 17.647216][ T266] virtio_fs_requests_done_work+0x231/0x890 [ 17.647458][ T266] process_one_work+0xe43/0x1660 [ 17.647654][ T266] worker_thread+0x591/0xcf0 [ 17.647850][ T266] kthread+0x37b/0x600 [ 17.647996][ T266] ret_from_fork+0x243/0x320 [ 17.648190][ T266] ret_from_fork_asm+0x1a/0x30 [ 17.648387][ T266] [ 17.648484][ T266] The buggy address belongs to the object at ffff888001926720 [ 17.648484][ T266] which belongs to the cache kmalloc-96 of size 96 [ 17.648950][ T266] The buggy address is located 0 bytes inside of [ 17.648950][ T266] freed 96-byte region [ffff888001926720, ffff888001926780) [ 17.649420][ T266] [ 17.649518][ T266] The buggy address belongs to the physical page: [ 17.649755][ T266] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 17.650095][ T266] flags: 0x80000000000000(node=0|zone=1) [ 17.650294][ T266] page_type: f5(slab) [ 17.650460][ T266] raw: 0080000000000000 ffff888001042340 ffffea0000155410 ffffea0000047050 [ 17.650809][ T266] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 17.651149][ T266] page dumped because: kasan: bad access detected [ 17.651388][ T266] [ 17.651485][ T266] Memory state around the buggy address: [ 17.651672][ T266] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 17.651965][ T266] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.652248][ T266] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 17.652532][ T266] ^ [ 17.652720][ T266] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.653015][ T266] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 17.653294][ T266] ================================================================== [ 17.653593][ T266] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr