[ 19.823418][ T265] ================================================================== [ 19.823768][ T265] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 19.824054][ T265] Read of size 1 at addr ffff888001926720 by task modprobe/265 [ 19.824323][ T265] [ 19.824418][ T265] CPU: 1 UID: 0 PID: 265 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 19.824423][ T265] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.824425][ T265] Call Trace: [ 19.824427][ T265] [ 19.824429][ T265] dump_stack_lvl+0x82/0xd0 [ 19.824437][ T265] print_address_description.constprop.0+0x2c/0x400 [ 19.824443][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.824447][ T265] print_report+0xb4/0x270 [ 19.824449][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.824453][ T265] ? kasan_addr_to_slab+0x25/0x80 [ 19.824457][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.824460][ T265] kasan_report+0xca/0x100 [ 19.824464][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.824469][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.824472][ T265] __kasan_check_byte+0x3a/0x50 [ 19.824476][ T265] krealloc_noprof+0x3d/0x320 [ 19.824480][ T265] ? execmem_alloc+0xc0/0x240 [ 19.824485][ T265] emit_its_trampoline+0xa5/0x300 [ 19.824489][ T265] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 19.824495][ T265] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 19.824498][ T265] apply_retpolines+0xcf/0x550 [ 19.824503][ T265] ? __pfx_apply_retpolines+0x10/0x10 [ 19.824507][ T265] ? __pfx___mutex_lock+0x10/0x10 [ 19.824518][ T265] module_finalize+0x3d5/0x9d0 [ 19.824524][ T265] ? add_kallsyms+0x7bf/0xf40 [ 19.824530][ T265] ? __pfx_module_finalize+0x10/0x10 [ 19.824534][ T265] ? __pfx_cmp_ex_sort+0x10/0x10 [ 19.824537][ T265] ? __pfx_swap_ex+0x10/0x10 [ 19.824542][ T265] load_module+0x139a/0x2660 [ 19.824549][ T265] ? __pfx_load_module+0x10/0x10 [ 19.824553][ T265] ? kernel_read_file+0x3f5/0x550 [ 19.824559][ T265] ? kernel_read_file+0x3d0/0x550 [ 19.824564][ T265] ? __pfx_kernel_read_file+0x10/0x10 [ 19.824568][ T265] ? add_chain_cache+0x110/0x370 [ 19.824573][ T265] ? init_module_from_file+0xe9/0x150 [ 19.824576][ T265] init_module_from_file+0xe9/0x150 [ 19.824580][ T265] ? __pfx_init_module_from_file+0x10/0x10 [ 19.824588][ T265] ? idempotent_init_module+0x31a/0x620 [ 19.824591][ T265] ? __lock_release+0x5d/0x170 [ 19.824596][ T265] ? do_raw_spin_unlock+0x58/0x220 [ 19.824601][ T265] idempotent_init_module+0x335/0x620 [ 19.824605][ T265] ? __pfx_idempotent_init_module+0x10/0x10 [ 19.824612][ T265] ? cap_capable+0x94/0x230 [ 19.824620][ T265] __x64_sys_finit_module+0xca/0x150 [ 19.824623][ T265] ? do_syscall_64+0x85/0x380 [ 19.824627][ T265] do_syscall_64+0xc1/0x380 [ 19.824631][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.824635][ T265] RIP: 0033:0x7f876b78ce5d [ 19.824640][ T265] 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 [ 19.824643][ T265] RSP: 002b:00007fffe27f4148 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 19.824647][ T265] RAX: ffffffffffffffda RBX: 000055690d910960 RCX: 00007f876b78ce5d [ 19.824649][ T265] RDX: 0000000000000000 RSI: 00005568dedb1a2a RDI: 0000000000000005 [ 19.824651][ T265] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fffe27f4280 [ 19.824653][ T265] R10: 0000000000000005 R11: 0000000000000246 R12: 00005568dedb1a2a [ 19.824655][ T265] R13: 000055690d910b10 R14: 000055690d910db0 R15: 0000000000000000 [ 19.824661][ T265] [ 19.824663][ T265] [ 19.835774][ T265] Allocated by task 255: [ 19.835912][ T265] kasan_save_stack+0x24/0x50 [ 19.836105][ T265] kasan_save_track+0x14/0x30 [ 19.836283][ T265] __kasan_kmalloc+0x7f/0x90 [ 19.836463][ T265] __kmalloc_noprof+0x1d4/0x470 [ 19.836651][ T265] virtqueue_add_split+0x6a7/0x1900 [ 19.836840][ T265] virtqueue_add_sgs+0x143/0x270 [ 19.837019][ T265] virtio_fs_enqueue_req+0x58c/0xfe0 [ 19.837242][ T265] virtio_fs_send_req+0x13a/0x710 [ 19.837422][ T265] __fuse_simple_request+0x22a/0xb50 [ 19.837614][ T265] fuse_readlink_folio+0x20b/0x400 [ 19.837797][ T265] fuse_get_link+0x12d/0x350 [ 19.838011][ T265] pick_link+0x7a2/0x1160 [ 19.838171][ T265] step_into+0x85a/0xfc0 [ 19.838340][ T265] link_path_walk+0x3c2/0xa10 [ 19.838546][ T265] path_openat+0x14d/0x380 [ 19.838744][ T265] do_filp_open+0x1d7/0x420 [ 19.838949][ T265] do_sys_openat2+0xd4/0x160 [ 19.839143][ T265] __x64_sys_openat+0x122/0x1e0 [ 19.839352][ T265] do_syscall_64+0xc1/0x380 [ 19.839540][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.839782][ T265] [ 19.839880][ T265] Freed by task 57: [ 19.840016][ T265] kasan_save_stack+0x24/0x50 [ 19.840217][ T265] kasan_save_track+0x14/0x30 [ 19.840400][ T265] kasan_save_free_info+0x3b/0x60 [ 19.840592][ T265] __kasan_slab_free+0x38/0x50 [ 19.840771][ T265] kfree+0x144/0x320 [ 19.840907][ T265] detach_buf_split+0x48d/0x6f0 [ 19.841111][ T265] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 19.841355][ T265] virtio_fs_requests_done_work+0x231/0x890 [ 19.841579][ T265] process_one_work+0xe43/0x1660 [ 19.841766][ T265] worker_thread+0x591/0xcf0 [ 19.841945][ T265] kthread+0x37b/0x600 [ 19.842079][ T265] ret_from_fork+0x243/0x320 [ 19.842259][ T265] ret_from_fork_asm+0x1a/0x30 [ 19.842441][ T265] [ 19.842557][ T265] The buggy address belongs to the object at ffff888001926720 [ 19.842557][ T265] which belongs to the cache kmalloc-96 of size 96 [ 19.842992][ T265] The buggy address is located 0 bytes inside of [ 19.842992][ T265] freed 96-byte region [ffff888001926720, ffff888001926780) [ 19.843446][ T265] [ 19.843537][ T265] The buggy address belongs to the physical page: [ 19.843778][ T265] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 19.844106][ T265] flags: 0x80000000000000(node=0|zone=1) [ 19.844301][ T265] page_type: f5(slab) [ 19.844442][ T265] raw: 0080000000000000 ffff888001042340 ffffea000029c390 ffffea00002ae6d0 [ 19.844764][ T265] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 19.845087][ T265] page dumped because: kasan: bad access detected [ 19.845340][ T265] [ 19.845433][ T265] Memory state around the buggy address: [ 19.845614][ T265] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 19.845895][ T265] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.846166][ T265] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 19.846438][ T265] ^ [ 19.846615][ T265] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.846887][ T265] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 19.847150][ T265] ================================================================== [ 19.847487][ T265] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr