[ 14.106433][ T249] ================================================================== [ 14.106776][ T249] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 14.107068][ T249] Read of size 1 at addr ffff88800192c720 by task modprobe/249 [ 14.107353][ T249] [ 14.107454][ T249] CPU: 0 UID: 0 PID: 249 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 14.107459][ T249] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.107461][ T249] Call Trace: [ 14.107463][ T249] [ 14.107465][ T249] dump_stack_lvl+0x82/0xd0 [ 14.107473][ T249] print_address_description.constprop.0+0x2c/0x400 [ 14.107478][ T249] ? emit_its_trampoline+0xa5/0x300 [ 14.107482][ T249] print_report+0xb4/0x270 [ 14.107485][ T249] ? emit_its_trampoline+0xa5/0x300 [ 14.107487][ T249] ? kasan_addr_to_slab+0x25/0x80 [ 14.107491][ T249] ? emit_its_trampoline+0xa5/0x300 [ 14.107493][ T249] kasan_report+0xca/0x100 [ 14.107497][ T249] ? emit_its_trampoline+0xa5/0x300 [ 14.107501][ T249] ? emit_its_trampoline+0xa5/0x300 [ 14.107503][ T249] __kasan_check_byte+0x3a/0x50 [ 14.107507][ T249] krealloc_noprof+0x3d/0x320 [ 14.107510][ T249] ? execmem_alloc+0xc0/0x240 [ 14.107515][ T249] emit_its_trampoline+0xa5/0x300 [ 14.107518][ T249] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 14.107524][ T249] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 14.107528][ T249] apply_retpolines+0xcf/0x550 [ 14.107532][ T249] ? __pfx_apply_retpolines+0x10/0x10 [ 14.107535][ T249] ? __pfx___mutex_lock+0x10/0x10 [ 14.107545][ T249] module_finalize+0x3d5/0x9d0 [ 14.107552][ T249] ? add_kallsyms+0x7bf/0xf40 [ 14.107556][ T249] ? __pfx_module_finalize+0x10/0x10 [ 14.107560][ T249] ? __pfx_cmp_ex_sort+0x10/0x10 [ 14.107564][ T249] ? __pfx_swap_ex+0x10/0x10 [ 14.107568][ T249] load_module+0x139a/0x2660 [ 14.107576][ T249] ? __pfx_load_module+0x10/0x10 [ 14.107580][ T249] ? kernel_read_file+0x3f5/0x550 [ 14.107586][ T249] ? kernel_read_file+0x3d0/0x550 [ 14.107589][ T249] ? __pfx_kernel_read_file+0x10/0x10 [ 14.107592][ T249] ? add_chain_cache+0x110/0x370 [ 14.107598][ T249] ? init_module_from_file+0xe9/0x150 [ 14.107601][ T249] init_module_from_file+0xe9/0x150 [ 14.107605][ T249] ? __pfx_init_module_from_file+0x10/0x10 [ 14.107614][ T249] ? idempotent_init_module+0x31a/0x620 [ 14.107618][ T249] ? __lock_release+0x5d/0x170 [ 14.107623][ T249] ? do_raw_spin_unlock+0x58/0x220 [ 14.107627][ T249] idempotent_init_module+0x335/0x620 [ 14.107631][ T249] ? __pfx_idempotent_init_module+0x10/0x10 [ 14.107639][ T249] ? cap_capable+0x94/0x230 [ 14.107646][ T249] __x64_sys_finit_module+0xca/0x150 [ 14.107649][ T249] ? do_syscall_64+0x85/0x380 [ 14.107653][ T249] do_syscall_64+0xc1/0x380 [ 14.107656][ T249] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.107660][ T249] RIP: 0033:0x7fecc9418e5d [ 14.107665][ T249] 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 [ 14.107667][ T249] RSP: 002b:00007ffcb2af1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 14.107671][ T249] RAX: ffffffffffffffda RBX: 0000560c31b6f960 RCX: 00007fecc9418e5d [ 14.107674][ T249] RDX: 0000000000000000 RSI: 0000560bf30aea2a RDI: 0000000000000005 [ 14.107675][ T249] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffcb2af12c0 [ 14.107677][ T249] R10: 0000000000000005 R11: 0000000000000246 R12: 0000560bf30aea2a [ 14.107679][ T249] R13: 0000560c31b6fb10 R14: 0000560c31b6fdb0 R15: 0000000000000000 [ 14.107685][ T249] [ 14.107686][ T249] [ 14.119289][ T249] Allocated by task 238: [ 14.119434][ T249] kasan_save_stack+0x24/0x50 [ 14.119626][ T249] kasan_save_track+0x14/0x30 [ 14.119811][ T249] __kasan_kmalloc+0x7f/0x90 [ 14.119996][ T249] __kmalloc_noprof+0x1d4/0x470 [ 14.120183][ T249] virtqueue_add_split+0x6a3/0x1920 [ 14.120372][ T249] virtqueue_add_sgs+0x143/0x270 [ 14.120558][ T249] virtio_fs_enqueue_req+0x58c/0xfe0 [ 14.120746][ T249] virtio_fs_send_req+0x13a/0x710 [ 14.120930][ T249] __fuse_simple_request+0x22a/0xb50 [ 14.121118][ T249] fuse_readlink_folio+0x20b/0x400 [ 14.121303][ T249] fuse_get_link+0x12d/0x350 [ 14.121490][ T249] pick_link+0x7a2/0x1160 [ 14.121634][ T249] step_into+0x85a/0xfc0 [ 14.121774][ T249] link_path_walk+0x3c2/0xa10 [ 14.121965][ T249] path_openat+0x14d/0x380 [ 14.122149][ T249] do_filp_open+0x1d7/0x420 [ 14.122333][ T249] do_sys_openat2+0xd4/0x160 [ 14.122518][ T249] __x64_sys_openat+0x122/0x1e0 [ 14.122702][ T249] do_syscall_64+0xc1/0x380 [ 14.122885][ T249] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 14.123112][ T249] [ 14.123206][ T249] Freed by task 68: [ 14.123343][ T249] kasan_save_stack+0x24/0x50 [ 14.123535][ T249] kasan_save_track+0x14/0x30 [ 14.123724][ T249] kasan_save_free_info+0x3b/0x60 [ 14.123910][ T249] __kasan_slab_free+0x38/0x50 [ 14.124093][ T249] kfree+0x144/0x320 [ 14.124231][ T249] detach_buf_split+0x48d/0x6f0 [ 14.124423][ T249] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 14.124652][ T249] virtio_fs_requests_done_work+0x231/0x890 [ 14.124883][ T249] process_one_work+0xe43/0x1660 [ 14.125067][ T249] worker_thread+0x591/0xcf0 [ 14.125251][ T249] kthread+0x37b/0x600 [ 14.125392][ T249] ret_from_fork+0x243/0x320 [ 14.125578][ T249] ret_from_fork_asm+0x1a/0x30 [ 14.125764][ T249] [ 14.125856][ T249] The buggy address belongs to the object at ffff88800192c720 [ 14.125856][ T249] which belongs to the cache kmalloc-96 of size 96 [ 14.126300][ T249] The buggy address is located 0 bytes inside of [ 14.126300][ T249] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 14.126742][ T249] [ 14.126836][ T249] The buggy address belongs to the physical page: [ 14.127060][ T249] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 14.127383][ T249] flags: 0x80000000000000(node=0|zone=1) [ 14.127576][ T249] page_type: f5(slab) [ 14.127723][ T249] raw: 0080000000000000 ffff888001042340 ffffea000007da10 ffffea0000042fd0 [ 14.128066][ T249] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 14.128395][ T249] page dumped because: kasan: bad access detected [ 14.128623][ T249] [ 14.128715][ T249] Memory state around the buggy address: [ 14.128897][ T249] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 14.129167][ T249] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.129433][ T249] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 14.129703][ T249] ^ [ 14.129886][ T249] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.130154][ T249] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 14.130421][ T249] ================================================================== [ 14.130780][ T249] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr