[ 12.786419][ T242] ================================================================== [ 12.786701][ T242] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.786955][ T242] Read of size 1 at addr ffff88800192c720 by task modprobe/242 [ 12.787202][ T242] [ 12.787289][ T242] CPU: 3 UID: 0 PID: 242 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.787294][ T242] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.787296][ T242] Call Trace: [ 12.787298][ T242] [ 12.787299][ T242] dump_stack_lvl+0x82/0xd0 [ 12.787307][ T242] print_address_description.constprop.0+0x2c/0x400 [ 12.787313][ T242] ? emit_its_trampoline+0xa5/0x300 [ 12.787316][ T242] print_report+0xb4/0x270 [ 12.787319][ T242] ? emit_its_trampoline+0xa5/0x300 [ 12.787321][ T242] ? kasan_addr_to_slab+0x25/0x80 [ 12.787325][ T242] ? emit_its_trampoline+0xa5/0x300 [ 12.787327][ T242] kasan_report+0xca/0x100 [ 12.787331][ T242] ? emit_its_trampoline+0xa5/0x300 [ 12.787335][ T242] ? emit_its_trampoline+0xa5/0x300 [ 12.787337][ T242] __kasan_check_byte+0x3a/0x50 [ 12.787341][ T242] krealloc_noprof+0x3d/0x320 [ 12.787344][ T242] ? execmem_alloc+0xc0/0x240 [ 12.787350][ T242] emit_its_trampoline+0xa5/0x300 [ 12.787353][ T242] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.787359][ T242] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.787362][ T242] apply_retpolines+0xcf/0x550 [ 12.787367][ T242] ? __pfx_apply_retpolines+0x10/0x10 [ 12.787370][ T242] ? __pfx___mutex_lock+0x10/0x10 [ 12.787380][ T242] module_finalize+0x3d5/0x9d0 [ 12.787387][ T242] ? add_kallsyms+0x7bf/0xf40 [ 12.787391][ T242] ? __pfx_module_finalize+0x10/0x10 [ 12.787395][ T242] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.787399][ T242] ? __pfx_swap_ex+0x10/0x10 [ 12.787403][ T242] load_module+0x139a/0x2660 [ 12.787411][ T242] ? __pfx_load_module+0x10/0x10 [ 12.787415][ T242] ? kernel_read_file+0x3f5/0x550 [ 12.787421][ T242] ? kernel_read_file+0x3d0/0x550 [ 12.787425][ T242] ? __pfx_kernel_read_file+0x10/0x10 [ 12.787428][ T242] ? add_chain_cache+0x110/0x370 [ 12.787434][ T242] ? init_module_from_file+0xe9/0x150 [ 12.787438][ T242] init_module_from_file+0xe9/0x150 [ 12.787442][ T242] ? __pfx_init_module_from_file+0x10/0x10 [ 12.787450][ T242] ? idempotent_init_module+0x31a/0x620 [ 12.787454][ T242] ? __lock_release+0x5d/0x170 [ 12.787459][ T242] ? do_raw_spin_unlock+0x58/0x220 [ 12.787463][ T242] idempotent_init_module+0x335/0x620 [ 12.787468][ T242] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.787476][ T242] ? cap_capable+0x94/0x230 [ 12.787483][ T242] __x64_sys_finit_module+0xca/0x150 [ 12.787486][ T242] ? do_syscall_64+0x85/0x380 [ 12.787490][ T242] do_syscall_64+0xc1/0x380 [ 12.787493][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.787497][ T242] RIP: 0033:0x7f23f4d7fe5d [ 12.787500][ T242] 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 [ 12.787503][ T242] RSP: 002b:00007ffd7f5a2eb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.787507][ T242] RAX: ffffffffffffffda RBX: 0000560a44d13960 RCX: 00007f23f4d7fe5d [ 12.787510][ T242] RDX: 0000000000000000 RSI: 0000560a104c8a2a RDI: 0000000000000005 [ 12.787512][ T242] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffd7f5a2ff0 [ 12.787513][ T242] R10: 0000000000000005 R11: 0000000000000246 R12: 0000560a104c8a2a [ 12.787515][ T242] R13: 0000560a44d13b10 R14: 0000560a44d13db0 R15: 0000000000000000 [ 12.787521][ T242] [ 12.787523][ T242] [ 12.797836][ T242] Allocated by task 235: [ 12.797966][ T242] kasan_save_stack+0x24/0x50 [ 12.798142][ T242] kasan_save_track+0x14/0x30 [ 12.798315][ T242] __kasan_kmalloc+0x7f/0x90 [ 12.798487][ T242] __kmalloc_noprof+0x1d4/0x470 [ 12.798665][ T242] virtqueue_add_split+0x6a3/0x1920 [ 12.798840][ T242] virtqueue_add_sgs+0x143/0x270 [ 12.799013][ T242] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.799187][ T242] virtio_fs_send_req+0x13a/0x710 [ 12.799360][ T242] __fuse_simple_request+0x22a/0xb50 [ 12.799534][ T242] fuse_readlink_folio+0x20b/0x400 [ 12.799707][ T242] fuse_get_link+0x12d/0x350 [ 12.799877][ T242] pick_link+0x7a2/0x1160 [ 12.800010][ T242] step_into+0x85a/0xfc0 [ 12.800140][ T242] link_path_walk+0x3c2/0xa10 [ 12.800312][ T242] path_lookupat+0x117/0x630 [ 12.800484][ T242] filename_lookup+0x1c4/0x470 [ 12.800662][ T242] vfs_statx+0xaa/0x2e0 [ 12.800795][ T242] vfs_fstatat+0x68/0xa0 [ 12.800924][ T242] __do_sys_newfstatat+0x6a/0xc0 [ 12.801094][ T242] do_syscall_64+0xc1/0x380 [ 12.801265][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.801481][ T242] [ 12.801567][ T242] Freed by task 229: [ 12.801694][ T242] kasan_save_stack+0x24/0x50 [ 12.801881][ T242] kasan_save_track+0x14/0x30 [ 12.802051][ T242] kasan_save_free_info+0x3b/0x60 [ 12.802223][ T242] __kasan_slab_free+0x38/0x50 [ 12.802394][ T242] kfree+0x144/0x320 [ 12.802522][ T242] detach_buf_split+0x48d/0x6f0 [ 12.802696][ T242] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.802907][ T242] virtio_fs_requests_done_work+0x231/0x890 [ 12.803120][ T242] process_one_work+0xe43/0x1660 [ 12.803295][ T242] worker_thread+0x591/0xcf0 [ 12.803466][ T242] kthread+0x37b/0x600 [ 12.803596][ T242] ret_from_fork+0x243/0x320 [ 12.803768][ T242] ret_from_fork_asm+0x1a/0x30 [ 12.803939][ T242] [ 12.804029][ T242] The buggy address belongs to the object at ffff88800192c720 [ 12.804029][ T242] which belongs to the cache kmalloc-96 of size 96 [ 12.804446][ T242] The buggy address is located 0 bytes inside of [ 12.804446][ T242] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.804855][ T242] [ 12.804941][ T242] The buggy address belongs to the physical page: [ 12.805151][ T242] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 12.805452][ T242] flags: 0x80000000000000(node=0|zone=1) [ 12.805627][ T242] page_type: f5(slab) [ 12.805762][ T242] raw: 0080000000000000 ffff888001042340 ffffea0000042fd0 ffffea00000c2d90 [ 12.806072][ T242] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 12.806378][ T242] page dumped because: kasan: bad access detected [ 12.806590][ T242] [ 12.806674][ T242] Memory state around the buggy address: [ 12.806837][ T242] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.807092][ T242] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.807339][ T242] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.807602][ T242] ^ [ 12.807767][ T242] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.808014][ T242] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.808259][ T242] ================================================================== [ 12.808521][ T242] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr