[ 19.399719][ T267] ================================================================== [ 19.400068][ T267] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 19.400359][ T267] Read of size 1 at addr ffff888001926720 by task modprobe/267 [ 19.400705][ T267] [ 19.400806][ T267] CPU: 1 UID: 0 PID: 267 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 19.400811][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.400814][ T267] Call Trace: [ 19.400815][ T267] [ 19.400817][ T267] dump_stack_lvl+0x82/0xd0 [ 19.400827][ T267] print_address_description.constprop.0+0x2c/0x400 [ 19.400833][ T267] ? emit_its_trampoline+0xa5/0x300 [ 19.400838][ T267] print_report+0xb4/0x270 [ 19.400840][ T267] ? emit_its_trampoline+0xa5/0x300 [ 19.400844][ T267] ? kasan_addr_to_slab+0x25/0x80 [ 19.400850][ T267] ? emit_its_trampoline+0xa5/0x300 [ 19.400853][ T267] kasan_report+0xca/0x100 [ 19.400856][ T267] ? emit_its_trampoline+0xa5/0x300 [ 19.400861][ T267] ? emit_its_trampoline+0xa5/0x300 [ 19.400865][ T267] __kasan_check_byte+0x3a/0x50 [ 19.400868][ T267] krealloc_noprof+0x3d/0x320 [ 19.400873][ T267] ? execmem_alloc+0xc0/0x240 [ 19.400878][ T267] emit_its_trampoline+0xa5/0x300 [ 19.400881][ T267] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 19.400890][ T267] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 19.400894][ T267] apply_retpolines+0xcf/0x550 [ 19.400899][ T267] ? __pfx_apply_retpolines+0x10/0x10 [ 19.400903][ T267] ? __pfx___mutex_lock+0x10/0x10 [ 19.400915][ T267] module_finalize+0x3d5/0x9d0 [ 19.400921][ T267] ? add_kallsyms+0x7bf/0xf40 [ 19.400928][ T267] ? __pfx_module_finalize+0x10/0x10 [ 19.400932][ T267] ? __pfx_cmp_ex_sort+0x10/0x10 [ 19.400935][ T267] ? __pfx_swap_ex+0x10/0x10 [ 19.400940][ T267] load_module+0x139a/0x2660 [ 19.400947][ T267] ? __pfx_load_module+0x10/0x10 [ 19.400951][ T267] ? kernel_read_file+0x3f5/0x550 [ 19.400958][ T267] ? kernel_read_file+0x3d0/0x550 [ 19.400962][ T267] ? __pfx_kernel_read_file+0x10/0x10 [ 19.400966][ T267] ? add_chain_cache+0x110/0x370 [ 19.400972][ T267] ? init_module_from_file+0xe9/0x150 [ 19.400975][ T267] init_module_from_file+0xe9/0x150 [ 19.400979][ T267] ? __pfx_init_module_from_file+0x10/0x10 [ 19.400987][ T267] ? idempotent_init_module+0x31a/0x620 [ 19.400990][ T267] ? __lock_release+0x5d/0x170 [ 19.400995][ T267] ? do_raw_spin_unlock+0x58/0x220 [ 19.400999][ T267] idempotent_init_module+0x335/0x620 [ 19.401004][ T267] ? __pfx_idempotent_init_module+0x10/0x10 [ 19.401011][ T267] ? cap_capable+0x94/0x230 [ 19.401017][ T267] ? __local_bh_enable+0x80/0x90 [ 19.401023][ T267] __x64_sys_finit_module+0xca/0x150 [ 19.401026][ T267] ? do_syscall_64+0x85/0x380 [ 19.401032][ T267] do_syscall_64+0xc1/0x380 [ 19.401036][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.401039][ T267] RIP: 0033:0x7f9c19330e5d [ 19.401044][ T267] 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 [ 19.401047][ T267] RSP: 002b:00007fff4f5b12b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 19.401051][ T267] RAX: ffffffffffffffda RBX: 00005616f115e960 RCX: 00007f9c19330e5d [ 19.401053][ T267] RDX: 0000000000000000 RSI: 00005616d7beca2a RDI: 0000000000000005 [ 19.401055][ T267] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff4f5b13f0 [ 19.401057][ T267] R10: 0000000000000005 R11: 0000000000000246 R12: 00005616d7beca2a [ 19.401058][ T267] R13: 00005616f115eb10 R14: 00005616f115edb0 R15: 0000000000000000 [ 19.401065][ T267] [ 19.401066][ T267] [ 19.413295][ T267] Allocated by task 256: [ 19.413445][ T267] kasan_save_stack+0x24/0x50 [ 19.413662][ T267] kasan_save_track+0x14/0x30 [ 19.413855][ T267] __kasan_kmalloc+0x7f/0x90 [ 19.414054][ T267] __kmalloc_noprof+0x1d4/0x470 [ 19.414252][ T267] virtqueue_add_split+0x6a3/0x1920 [ 19.414452][ T267] virtqueue_add_sgs+0x143/0x270 [ 19.414715][ T267] virtio_fs_enqueue_req+0x58c/0xfe0 [ 19.414916][ T267] virtio_fs_send_req+0x13a/0x710 [ 19.415110][ T267] __fuse_simple_request+0x22a/0xb50 [ 19.415308][ T267] fuse_readlink_folio+0x20b/0x400 [ 19.415513][ T267] fuse_get_link+0x12d/0x350 [ 19.415712][ T267] pick_link+0x7a2/0x1160 [ 19.415863][ T267] step_into+0x85a/0xfc0 [ 19.416013][ T267] link_path_walk+0x3c2/0xa10 [ 19.416208][ T267] path_lookupat+0x117/0x630 [ 19.416416][ T267] filename_lookup+0x1c4/0x470 [ 19.416621][ T267] vfs_statx+0xaa/0x2e0 [ 19.416769][ T267] vfs_fstatat+0x68/0xa0 [ 19.416917][ T267] __do_sys_newfstatat+0x6a/0xc0 [ 19.417109][ T267] do_syscall_64+0xc1/0x380 [ 19.417305][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.417561][ T267] [ 19.417661][ T267] Freed by task 66: [ 19.417812][ T267] kasan_save_stack+0x24/0x50 [ 19.418009][ T267] kasan_save_track+0x14/0x30 [ 19.418203][ T267] kasan_save_free_info+0x3b/0x60 [ 19.418397][ T267] __kasan_slab_free+0x38/0x50 [ 19.418603][ T267] kfree+0x144/0x320 [ 19.418750][ T267] detach_buf_split+0x48d/0x6f0 [ 19.418946][ T267] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 19.419186][ T267] virtio_fs_requests_done_work+0x231/0x890 [ 19.419434][ T267] process_one_work+0xe43/0x1660 [ 19.419655][ T267] worker_thread+0x591/0xcf0 [ 19.419859][ T267] kthread+0x37b/0x600 [ 19.420006][ T267] ret_from_fork+0x243/0x320 [ 19.420202][ T267] ret_from_fork_asm+0x1a/0x30 [ 19.420398][ T267] [ 19.420505][ T267] The buggy address belongs to the object at ffff888001926720 [ 19.420505][ T267] which belongs to the cache kmalloc-96 of size 96 [ 19.420980][ T267] The buggy address is located 0 bytes inside of [ 19.420980][ T267] freed 96-byte region [ffff888001926720, ffff888001926780) [ 19.421448][ T267] [ 19.421574][ T267] The buggy address belongs to the physical page: [ 19.421861][ T267] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 19.422269][ T267] flags: 0x80000000000000(node=0|zone=1) [ 19.422480][ T267] page_type: f5(slab) [ 19.422716][ T267] raw: 0080000000000000 ffff888001042340 ffffea000026d090 ffffea000009a8d0 [ 19.423078][ T267] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 19.423444][ T267] page dumped because: kasan: bad access detected [ 19.423726][ T267] [ 19.423833][ T267] Memory state around the buggy address: [ 19.424054][ T267] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 19.424352][ T267] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.424668][ T267] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 19.424987][ T267] ^ [ 19.425191][ T267] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.425504][ T267] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 19.425839][ T267] ================================================================== [ 19.426630][ T267] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr