[ 13.387885][ T241] ================================================================== [ 13.388183][ T241] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.388446][ T241] Read of size 1 at addr ffff88800192c720 by task modprobe/241 [ 13.388711][ T241] [ 13.388802][ T241] CPU: 2 UID: 0 PID: 241 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.388808][ T241] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.388811][ T241] Call Trace: [ 13.388813][ T241] [ 13.388815][ T241] dump_stack_lvl+0x82/0xd0 [ 13.388825][ T241] print_address_description.constprop.0+0x2c/0x400 [ 13.388833][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.388837][ T241] print_report+0xb4/0x270 [ 13.388840][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.388842][ T241] ? kasan_addr_to_slab+0x25/0x80 [ 13.388846][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.388848][ T241] kasan_report+0xca/0x100 [ 13.388852][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.388857][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.388859][ T241] __kasan_check_byte+0x3a/0x50 [ 13.388863][ T241] krealloc_noprof+0x3d/0x320 [ 13.388867][ T241] ? execmem_alloc+0xc0/0x240 [ 13.388873][ T241] emit_its_trampoline+0xa5/0x300 [ 13.388876][ T241] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.388883][ T241] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.388887][ T241] apply_retpolines+0xcf/0x550 [ 13.388891][ T241] ? __pfx_apply_retpolines+0x10/0x10 [ 13.388895][ T241] ? __pfx___mutex_lock+0x10/0x10 [ 13.388905][ T241] module_finalize+0x3d5/0x9d0 [ 13.388913][ T241] ? add_kallsyms+0x7bf/0xf40 [ 13.388918][ T241] ? __pfx_module_finalize+0x10/0x10 [ 13.388923][ T241] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.388926][ T241] ? __pfx_swap_ex+0x10/0x10 [ 13.388931][ T241] load_module+0x139a/0x2660 [ 13.388940][ T241] ? __pfx_load_module+0x10/0x10 [ 13.388943][ T241] ? kernel_read_file+0x3f5/0x550 [ 13.388950][ T241] ? kernel_read_file+0x3d0/0x550 [ 13.388953][ T241] ? __pfx_kernel_read_file+0x10/0x10 [ 13.388957][ T241] ? add_chain_cache+0x110/0x370 [ 13.388964][ T241] ? init_module_from_file+0xe9/0x150 [ 13.388968][ T241] init_module_from_file+0xe9/0x150 [ 13.388971][ T241] ? __pfx_init_module_from_file+0x10/0x10 [ 13.388980][ T241] ? idempotent_init_module+0x31a/0x620 [ 13.388984][ T241] ? __lock_release+0x5d/0x170 [ 13.388990][ T241] ? do_raw_spin_unlock+0x58/0x220 [ 13.388994][ T241] idempotent_init_module+0x335/0x620 [ 13.388998][ T241] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.389010][ T241] ? cap_capable+0x94/0x230 [ 13.389020][ T241] __x64_sys_finit_module+0xca/0x150 [ 13.389025][ T241] ? do_syscall_64+0x85/0x380 [ 13.389031][ T241] do_syscall_64+0xc1/0x380 [ 13.389035][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.389039][ T241] RIP: 0033:0x7f65a15e8e5d [ 13.389044][ T241] 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 [ 13.389047][ T241] RSP: 002b:00007fff63af0608 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.389051][ T241] RAX: ffffffffffffffda RBX: 000055b0ca8d6960 RCX: 00007f65a15e8e5d [ 13.389054][ T241] RDX: 0000000000000000 RSI: 000055b0c0712a2a RDI: 0000000000000005 [ 13.389056][ T241] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff63af0740 [ 13.389058][ T241] R10: 0000000000000005 R11: 0000000000000246 R12: 000055b0c0712a2a [ 13.389059][ T241] R13: 000055b0ca8d6b10 R14: 000055b0ca8d6db0 R15: 0000000000000000 [ 13.389066][ T241] [ 13.389067][ T241] [ 13.399793][ T241] Allocated by task 222: [ 13.399925][ T241] kasan_save_stack+0x24/0x50 [ 13.400116][ T241] kasan_save_track+0x14/0x30 [ 13.400292][ T241] __kasan_kmalloc+0x7f/0x90 [ 13.400465][ T241] __kmalloc_noprof+0x1d4/0x470 [ 13.400646][ T241] virtqueue_add_split+0x6a3/0x1920 [ 13.400835][ T241] virtqueue_add_sgs+0x143/0x270 [ 13.401016][ T241] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.401203][ T241] virtio_fs_send_req+0x13a/0x710 [ 13.401377][ T241] __fuse_simple_request+0x22a/0xb50 [ 13.401556][ T241] fuse_readlink_folio+0x20b/0x400 [ 13.401747][ T241] fuse_get_link+0x12d/0x350 [ 13.401922][ T241] pick_link+0x7a2/0x1160 [ 13.402055][ T241] step_into+0x85a/0xfc0 [ 13.402187][ T241] link_path_walk+0x3c2/0xa10 [ 13.402360][ T241] path_lookupat+0x117/0x630 [ 13.402532][ T241] filename_lookup+0x1c4/0x470 [ 13.402704][ T241] vfs_statx+0xaa/0x2e0 [ 13.402842][ T241] vfs_fstatat+0x68/0xa0 [ 13.402980][ T241] __do_sys_newfstatat+0x6a/0xc0 [ 13.403164][ T241] do_syscall_64+0xc1/0x380 [ 13.403339][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.403568][ T241] [ 13.403659][ T241] Freed by task 57: [ 13.403791][ T241] kasan_save_stack+0x24/0x50 [ 13.403989][ T241] kasan_save_track+0x14/0x30 [ 13.404161][ T241] kasan_save_free_info+0x3b/0x60 [ 13.404337][ T241] __kasan_slab_free+0x38/0x50 [ 13.404523][ T241] kfree+0x144/0x320 [ 13.404655][ T241] detach_buf_split+0x48d/0x6f0 [ 13.404837][ T241] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.405053][ T241] virtio_fs_requests_done_work+0x231/0x890 [ 13.405268][ T241] process_one_work+0xe43/0x1660 [ 13.405445][ T241] worker_thread+0x591/0xcf0 [ 13.405618][ T241] kthread+0x37b/0x600 [ 13.405755][ T241] ret_from_fork+0x243/0x320 [ 13.405931][ T241] ret_from_fork_asm+0x1a/0x30 [ 13.406105][ T241] [ 13.406195][ T241] The buggy address belongs to the object at ffff88800192c720 [ 13.406195][ T241] which belongs to the cache kmalloc-96 of size 96 [ 13.406643][ T241] The buggy address is located 0 bytes inside of [ 13.406643][ T241] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.407063][ T241] [ 13.407153][ T241] The buggy address belongs to the physical page: [ 13.407364][ T241] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.407670][ T241] flags: 0x80000000000000(node=0|zone=1) [ 13.407851][ T241] page_type: f5(slab) [ 13.407989][ T241] raw: 0080000000000000 ffff888001042340 ffffea000016c7d0 ffffea0000233010 [ 13.408305][ T241] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.408615][ T241] page dumped because: kasan: bad access detected [ 13.408827][ T241] [ 13.408914][ T241] Memory state around the buggy address: [ 13.409080][ T241] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.409340][ T241] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.409614][ T241] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.409863][ T241] ^ [ 13.410030][ T241] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.410275][ T241] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.410536][ T241] ================================================================== [ 13.410978][ T241] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr