[ 21.728384][ T340] ================================================================== [ 21.728748][ T340] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 21.729026][ T340] Read of size 1 at addr ffff888001926720 by task modprobe/340 [ 21.729285][ T340] [ 21.729378][ T340] CPU: 1 UID: 0 PID: 340 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 21.729383][ T340] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 21.729385][ T340] Call Trace: [ 21.729387][ T340] [ 21.729389][ T340] dump_stack_lvl+0x82/0xd0 [ 21.729397][ T340] print_address_description.constprop.0+0x2c/0x400 [ 21.729402][ T340] ? emit_its_trampoline+0xa5/0x300 [ 21.729406][ T340] print_report+0xb4/0x270 [ 21.729409][ T340] ? emit_its_trampoline+0xa5/0x300 [ 21.729412][ T340] ? kasan_addr_to_slab+0x25/0x80 [ 21.729416][ T340] ? emit_its_trampoline+0xa5/0x300 [ 21.729419][ T340] kasan_report+0xca/0x100 [ 21.729423][ T340] ? emit_its_trampoline+0xa5/0x300 [ 21.729428][ T340] ? emit_its_trampoline+0xa5/0x300 [ 21.729431][ T340] __kasan_check_byte+0x3a/0x50 [ 21.729434][ T340] krealloc_noprof+0x3d/0x320 [ 21.729439][ T340] ? execmem_alloc+0xc0/0x240 [ 21.729444][ T340] emit_its_trampoline+0xa5/0x300 [ 21.729447][ T340] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 21.729454][ T340] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 21.729457][ T340] apply_retpolines+0xcf/0x550 [ 21.729462][ T340] ? __pfx_apply_retpolines+0x10/0x10 [ 21.729466][ T340] ? __pfx___mutex_lock+0x10/0x10 [ 21.729476][ T340] module_finalize+0x3d5/0x9d0 [ 21.729483][ T340] ? add_kallsyms+0x7bf/0xf40 [ 21.729489][ T340] ? __pfx_module_finalize+0x10/0x10 [ 21.729493][ T340] ? __pfx_cmp_ex_sort+0x10/0x10 [ 21.729496][ T340] ? __pfx_swap_ex+0x10/0x10 [ 21.729501][ T340] load_module+0x139a/0x2660 [ 21.729508][ T340] ? __pfx_load_module+0x10/0x10 [ 21.729511][ T340] ? kernel_read_file+0x3f5/0x550 [ 21.729518][ T340] ? kernel_read_file+0x3d0/0x550 [ 21.729523][ T340] ? __pfx_kernel_read_file+0x10/0x10 [ 21.729527][ T340] ? add_chain_cache+0x110/0x370 [ 21.729532][ T340] ? init_module_from_file+0xe9/0x150 [ 21.729535][ T340] init_module_from_file+0xe9/0x150 [ 21.729538][ T340] ? __pfx_init_module_from_file+0x10/0x10 [ 21.729547][ T340] ? idempotent_init_module+0x31a/0x620 [ 21.729550][ T340] ? __lock_release+0x5d/0x170 [ 21.729554][ T340] ? do_raw_spin_unlock+0x58/0x220 [ 21.729559][ T340] idempotent_init_module+0x335/0x620 [ 21.729563][ T340] ? __pfx_idempotent_init_module+0x10/0x10 [ 21.729570][ T340] ? cap_capable+0x94/0x230 [ 21.729577][ T340] __x64_sys_finit_module+0xca/0x150 [ 21.729581][ T340] ? do_syscall_64+0x85/0x380 [ 21.729585][ T340] do_syscall_64+0xc1/0x380 [ 21.729588][ T340] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 21.729592][ T340] RIP: 0033:0x7f11066d2e5d [ 21.729596][ T340] 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 [ 21.729598][ T340] RSP: 002b:00007ffcbe41bcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 21.729602][ T340] RAX: ffffffffffffffda RBX: 0000560b00b91960 RCX: 00007f11066d2e5d [ 21.729605][ T340] RDX: 0000000000000000 RSI: 0000560ae99b1a2a RDI: 0000000000000005 [ 21.729606][ T340] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffcbe41be30 [ 21.729608][ T340] R10: 0000000000000005 R11: 0000000000000246 R12: 0000560ae99b1a2a [ 21.729610][ T340] R13: 0000560b00b91b10 R14: 0000560b00b91db0 R15: 0000000000000000 [ 21.729616][ T340] [ 21.729618][ T340] [ 21.740334][ T340] Allocated by task 331: [ 21.740468][ T340] kasan_save_stack+0x24/0x50 [ 21.740650][ T340] kasan_save_track+0x14/0x30 [ 21.740828][ T340] __kasan_kmalloc+0x7f/0x90 [ 21.741005][ T340] __kmalloc_noprof+0x1d4/0x470 [ 21.741184][ T340] virtqueue_add_split+0x6a3/0x1920 [ 21.741367][ T340] virtqueue_add_sgs+0x143/0x270 [ 21.741543][ T340] virtio_fs_enqueue_req+0x58c/0xfe0 [ 21.741722][ T340] virtio_fs_send_req+0x13a/0x710 [ 21.741900][ T340] __fuse_simple_request+0x22a/0xb50 [ 21.742080][ T340] fuse_readlink_folio+0x20b/0x400 [ 21.742259][ T340] fuse_get_link+0x12d/0x350 [ 21.742437][ T340] pick_link+0x7a2/0x1160 [ 21.742570][ T340] step_into+0x85a/0xfc0 [ 21.742703][ T340] link_path_walk+0x3c2/0xa10 [ 21.742879][ T340] path_lookupat+0x117/0x630 [ 21.743055][ T340] filename_lookup+0x1c4/0x470 [ 21.743232][ T340] vfs_statx+0xaa/0x2e0 [ 21.743366][ T340] vfs_fstatat+0x68/0xa0 [ 21.743501][ T340] __do_sys_newfstatat+0x6a/0xc0 [ 21.743677][ T340] do_syscall_64+0xc1/0x380 [ 21.743853][ T340] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 21.744070][ T340] [ 21.744159][ T340] Freed by task 52: [ 21.744380][ T340] kasan_save_stack+0x24/0x50 [ 21.744567][ T340] kasan_save_track+0x14/0x30 [ 21.744748][ T340] kasan_save_free_info+0x3b/0x60 [ 21.744925][ T340] __kasan_slab_free+0x38/0x50 [ 21.745104][ T340] kfree+0x144/0x320 [ 21.745239][ T340] detach_buf_split+0x48d/0x6f0 [ 21.745417][ T340] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 21.745637][ T340] virtio_fs_requests_done_work+0x231/0x890 [ 21.745858][ T340] process_one_work+0xe43/0x1660 [ 21.746036][ T340] worker_thread+0x591/0xcf0 [ 21.746214][ T340] kthread+0x37b/0x600 [ 21.746348][ T340] ret_from_fork+0x243/0x320 [ 21.746527][ T340] ret_from_fork_asm+0x1a/0x30 [ 21.746705][ T340] [ 21.746793][ T340] The buggy address belongs to the object at ffff888001926720 [ 21.746793][ T340] which belongs to the cache kmalloc-96 of size 96 [ 21.747237][ T340] The buggy address is located 0 bytes inside of [ 21.747237][ T340] freed 96-byte region [ffff888001926720, ffff888001926780) [ 21.747662][ T340] [ 21.747752][ T340] The buggy address belongs to the physical page: [ 21.747966][ T340] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 21.748281][ T340] flags: 0x80000000000000(node=0|zone=1) [ 21.748465][ T340] page_type: f5(slab) [ 21.748605][ T340] raw: 0080000000000000 ffff888001042340 ffffea0000358c50 ffffea0000085190 [ 21.748922][ T340] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 21.749241][ T340] page dumped because: kasan: bad access detected [ 21.749458][ T340] [ 21.749546][ T340] Memory state around the buggy address: [ 21.749717][ T340] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 21.749977][ T340] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.750237][ T340] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 21.750498][ T340] ^ [ 21.750670][ T340] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.750926][ T340] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 21.751180][ T340] ================================================================== [ 21.751852][ T340] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr