[ 16.511522][ T267] ================================================================== [ 16.511882][ T267] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.512141][ T267] Read of size 1 at addr ffff888001926720 by task modprobe/267 [ 16.512401][ T267] [ 16.512493][ T267] CPU: 2 UID: 0 PID: 267 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.512498][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.512501][ T267] Call Trace: [ 16.512502][ T267] [ 16.512504][ T267] dump_stack_lvl+0x82/0xd0 [ 16.512512][ T267] print_address_description.constprop.0+0x2c/0x400 [ 16.512517][ T267] ? emit_its_trampoline+0xa5/0x300 [ 16.512521][ T267] print_report+0xb4/0x270 [ 16.512524][ T267] ? emit_its_trampoline+0xa5/0x300 [ 16.512527][ T267] ? kasan_addr_to_slab+0x25/0x80 [ 16.512532][ T267] ? emit_its_trampoline+0xa5/0x300 [ 16.512535][ T267] kasan_report+0xca/0x100 [ 16.512539][ T267] ? emit_its_trampoline+0xa5/0x300 [ 16.512544][ T267] ? emit_its_trampoline+0xa5/0x300 [ 16.512547][ T267] __kasan_check_byte+0x3a/0x50 [ 16.512551][ T267] krealloc_noprof+0x3d/0x320 [ 16.512555][ T267] ? execmem_alloc+0xc0/0x240 [ 16.512560][ T267] emit_its_trampoline+0xa5/0x300 [ 16.512564][ T267] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.512569][ T267] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.512573][ T267] apply_retpolines+0xcf/0x550 [ 16.512578][ T267] ? __pfx_apply_retpolines+0x10/0x10 [ 16.512582][ T267] ? __pfx___mutex_lock+0x10/0x10 [ 16.512592][ T267] module_finalize+0x3d5/0x9d0 [ 16.512598][ T267] ? add_kallsyms+0x7bf/0xf40 [ 16.512604][ T267] ? __pfx_module_finalize+0x10/0x10 [ 16.512607][ T267] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.512611][ T267] ? __pfx_swap_ex+0x10/0x10 [ 16.512615][ T267] load_module+0x139a/0x2660 [ 16.512623][ T267] ? __pfx_load_module+0x10/0x10 [ 16.512626][ T267] ? kernel_read_file+0x3f5/0x550 [ 16.512633][ T267] ? kernel_read_file+0x3d0/0x550 [ 16.512637][ T267] ? __pfx_kernel_read_file+0x10/0x10 [ 16.512641][ T267] ? add_chain_cache+0x110/0x370 [ 16.512646][ T267] ? init_module_from_file+0xe9/0x150 [ 16.512649][ T267] init_module_from_file+0xe9/0x150 [ 16.512653][ T267] ? __pfx_init_module_from_file+0x10/0x10 [ 16.512661][ T267] ? idempotent_init_module+0x31a/0x620 [ 16.512664][ T267] ? __lock_release+0x5d/0x170 [ 16.512669][ T267] ? do_raw_spin_unlock+0x58/0x220 [ 16.512673][ T267] idempotent_init_module+0x335/0x620 [ 16.512678][ T267] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.512685][ T267] ? cap_capable+0x94/0x230 [ 16.512692][ T267] __x64_sys_finit_module+0xca/0x150 [ 16.512695][ T267] ? do_syscall_64+0x85/0x380 [ 16.512700][ T267] do_syscall_64+0xc1/0x380 [ 16.512703][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.512707][ T267] RIP: 0033:0x7f45b91aee5d [ 16.512711][ 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 [ 16.512714][ T267] RSP: 002b:00007ffcf0e95618 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.512718][ T267] RAX: ffffffffffffffda RBX: 00005570eea85960 RCX: 00007f45b91aee5d [ 16.512720][ T267] RDX: 0000000000000000 RSI: 00005570e8970a2a RDI: 0000000000000005 [ 16.512723][ T267] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffcf0e95750 [ 16.512724][ T267] R10: 0000000000000005 R11: 0000000000000246 R12: 00005570e8970a2a [ 16.512726][ T267] R13: 00005570eea85b10 R14: 00005570eea85db0 R15: 0000000000000000 [ 16.512733][ T267] [ 16.512734][ T267] [ 16.523365][ T267] Allocated by task 258: [ 16.523497][ T267] kasan_save_stack+0x24/0x50 [ 16.523677][ T267] kasan_save_track+0x14/0x30 [ 16.523853][ T267] __kasan_kmalloc+0x7f/0x90 [ 16.524029][ T267] __kmalloc_noprof+0x1d4/0x470 [ 16.524206][ T267] virtqueue_add_split+0x6a3/0x1920 [ 16.524383][ T267] virtqueue_add_sgs+0x143/0x270 [ 16.524572][ T267] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.524751][ T267] virtio_fs_send_req+0x13a/0x710 [ 16.524928][ T267] __fuse_simple_request+0x22a/0xb50 [ 16.525107][ T267] fuse_readlink_folio+0x20b/0x400 [ 16.525287][ T267] fuse_get_link+0x12d/0x350 [ 16.525462][ T267] pick_link+0x7a2/0x1160 [ 16.525596][ T267] step_into+0x85a/0xfc0 [ 16.525728][ T267] link_path_walk+0x3c2/0xa10 [ 16.525903][ T267] path_openat+0x14d/0x380 [ 16.526080][ T267] do_filp_open+0x1d7/0x420 [ 16.526256][ T267] do_sys_openat2+0xd4/0x160 [ 16.526431][ T267] __x64_sys_openat+0x122/0x1e0 [ 16.526607][ T267] do_syscall_64+0xc1/0x380 [ 16.526782][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.527000][ T267] [ 16.527089][ T267] Freed by task 51: [ 16.527220][ T267] kasan_save_stack+0x24/0x50 [ 16.527399][ T267] kasan_save_track+0x14/0x30 [ 16.527576][ T267] kasan_save_free_info+0x3b/0x60 [ 16.527753][ T267] __kasan_slab_free+0x38/0x50 [ 16.527930][ T267] kfree+0x144/0x320 [ 16.528066][ T267] detach_buf_split+0x48d/0x6f0 [ 16.528242][ T267] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.528459][ T267] virtio_fs_requests_done_work+0x231/0x890 [ 16.528679][ T267] process_one_work+0xe43/0x1660 [ 16.528856][ T267] worker_thread+0x591/0xcf0 [ 16.529032][ T267] kthread+0x37b/0x600 [ 16.529165][ T267] ret_from_fork+0x243/0x320 [ 16.529340][ T267] ret_from_fork_asm+0x1a/0x30 [ 16.529524][ T267] [ 16.529611][ T267] The buggy address belongs to the object at ffff888001926720 [ 16.529611][ T267] which belongs to the cache kmalloc-96 of size 96 [ 16.530029][ T267] The buggy address is located 0 bytes inside of [ 16.530029][ T267] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.530452][ T267] [ 16.530544][ T267] The buggy address belongs to the physical page: [ 16.530757][ T267] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 16.531068][ T267] flags: 0x80000000000000(node=0|zone=1) [ 16.531251][ T267] page_type: f5(slab) [ 16.531389][ T267] raw: 0080000000000000 ffff888001042340 ffffea0000262650 ffffea000033cdd0 [ 16.531705][ T267] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 16.532019][ T267] page dumped because: kasan: bad access detected [ 16.532235][ T267] [ 16.532322][ T267] Memory state around the buggy address: [ 16.532492][ T267] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.532747][ T267] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.533005][ T267] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.533258][ T267] ^ [ 16.533428][ T267] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.533683][ T267] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.533938][ T267] ================================================================== [ 16.534389][ T267] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr