[ 18.182652][ T266] ================================================================== [ 18.183028][ T266] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 18.183292][ T266] Read of size 1 at addr ffff888001926720 by task modprobe/266 [ 18.183558][ T266] [ 18.183651][ T266] CPU: 1 UID: 0 PID: 266 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 18.183657][ T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.183659][ T266] Call Trace: [ 18.183661][ T266] [ 18.183663][ T266] dump_stack_lvl+0x82/0xd0 [ 18.183671][ T266] print_address_description.constprop.0+0x2c/0x400 [ 18.183676][ T266] ? emit_its_trampoline+0xa5/0x300 [ 18.183680][ T266] print_report+0xb4/0x270 [ 18.183683][ T266] ? emit_its_trampoline+0xa5/0x300 [ 18.183686][ T266] ? kasan_addr_to_slab+0x25/0x80 [ 18.183692][ T266] ? emit_its_trampoline+0xa5/0x300 [ 18.183695][ T266] kasan_report+0xca/0x100 [ 18.183698][ T266] ? emit_its_trampoline+0xa5/0x300 [ 18.183703][ T266] ? emit_its_trampoline+0xa5/0x300 [ 18.183707][ T266] __kasan_check_byte+0x3a/0x50 [ 18.183710][ T266] krealloc_noprof+0x3d/0x320 [ 18.183714][ T266] ? execmem_alloc+0xc0/0x240 [ 18.183719][ T266] emit_its_trampoline+0xa5/0x300 [ 18.183723][ T266] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 18.183729][ T266] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 18.183733][ T266] apply_retpolines+0xcf/0x550 [ 18.183737][ T266] ? __pfx_apply_retpolines+0x10/0x10 [ 18.183741][ T266] ? __pfx___mutex_lock+0x10/0x10 [ 18.183752][ T266] module_finalize+0x3d5/0x9d0 [ 18.183758][ T266] ? add_kallsyms+0x7bf/0xf40 [ 18.183763][ T266] ? __pfx_module_finalize+0x10/0x10 [ 18.183767][ T266] ? __pfx_cmp_ex_sort+0x10/0x10 [ 18.183771][ T266] ? __pfx_swap_ex+0x10/0x10 [ 18.183775][ T266] load_module+0x139a/0x2660 [ 18.183783][ T266] ? __pfx_load_module+0x10/0x10 [ 18.183786][ T266] ? kernel_read_file+0x3f5/0x550 [ 18.183793][ T266] ? kernel_read_file+0x3d0/0x550 [ 18.183798][ T266] ? __pfx_kernel_read_file+0x10/0x10 [ 18.183801][ T266] ? add_chain_cache+0x110/0x370 [ 18.183807][ T266] ? init_module_from_file+0xe9/0x150 [ 18.183810][ T266] init_module_from_file+0xe9/0x150 [ 18.183813][ T266] ? __pfx_init_module_from_file+0x10/0x10 [ 18.183822][ T266] ? idempotent_init_module+0x31a/0x620 [ 18.183825][ T266] ? __lock_release+0x5d/0x170 [ 18.183830][ T266] ? do_raw_spin_unlock+0x58/0x220 [ 18.183835][ T266] idempotent_init_module+0x335/0x620 [ 18.183839][ T266] ? __pfx_idempotent_init_module+0x10/0x10 [ 18.183846][ T266] ? cap_capable+0x94/0x230 [ 18.183853][ T266] __x64_sys_finit_module+0xca/0x150 [ 18.183856][ T266] ? do_syscall_64+0x85/0x380 [ 18.183861][ T266] do_syscall_64+0xc1/0x380 [ 18.183864][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.183868][ T266] RIP: 0033:0x7fd7f8637e5d [ 18.183873][ T266] 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 [ 18.183876][ T266] RSP: 002b:00007fff23018b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 18.183880][ T266] RAX: ffffffffffffffda RBX: 000056436a817960 RCX: 00007fd7f8637e5d [ 18.183882][ T266] RDX: 0000000000000000 RSI: 0000564348da1a2a RDI: 0000000000000005 [ 18.183884][ T266] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff23018c90 [ 18.183886][ T266] R10: 0000000000000005 R11: 0000000000000246 R12: 0000564348da1a2a [ 18.183888][ T266] R13: 000056436a817b10 R14: 000056436a817db0 R15: 0000000000000000 [ 18.183894][ T266] [ 18.183895][ T266] [ 18.195536][ T266] Allocated by task 254: [ 18.195675][ T266] kasan_save_stack+0x24/0x50 [ 18.195859][ T266] kasan_save_track+0x14/0x30 [ 18.196038][ T266] __kasan_kmalloc+0x7f/0x90 [ 18.196217][ T266] __kmalloc_noprof+0x1d4/0x470 [ 18.196401][ T266] virtqueue_add_split+0x6a3/0x1920 [ 18.196582][ T266] virtqueue_add_sgs+0x143/0x270 [ 18.196760][ T266] virtio_fs_enqueue_req+0x58c/0xfe0 [ 18.196942][ T266] virtio_fs_send_req+0x13a/0x710 [ 18.197119][ T266] __fuse_simple_request+0x22a/0xb50 [ 18.197300][ T266] fuse_flush+0x41a/0x620 [ 18.197438][ T266] ovl_flush+0x113/0x170 [ 18.197582][ T266] filp_flush+0xe9/0x170 [ 18.197726][ T266] __x64_sys_close+0x72/0xd0 [ 18.197907][ T266] do_syscall_64+0xc1/0x380 [ 18.198092][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.198313][ T266] [ 18.198422][ T266] Freed by task 69: [ 18.198555][ T266] kasan_save_stack+0x24/0x50 [ 18.198735][ T266] kasan_save_track+0x14/0x30 [ 18.198913][ T266] kasan_save_free_info+0x3b/0x60 [ 18.199091][ T266] __kasan_slab_free+0x38/0x50 [ 18.199272][ T266] kfree+0x144/0x320 [ 18.199421][ T266] detach_buf_split+0x48d/0x6f0 [ 18.199617][ T266] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 18.199859][ T266] virtio_fs_requests_done_work+0x231/0x890 [ 18.200101][ T266] process_one_work+0xe43/0x1660 [ 18.200296][ T266] worker_thread+0x591/0xcf0 [ 18.200489][ T266] kthread+0x37b/0x600 [ 18.200637][ T266] ret_from_fork+0x243/0x320 [ 18.200833][ T266] ret_from_fork_asm+0x1a/0x30 [ 18.201032][ T266] [ 18.201129][ T266] The buggy address belongs to the object at ffff888001926720 [ 18.201129][ T266] which belongs to the cache kmalloc-96 of size 96 [ 18.201595][ T266] The buggy address is located 0 bytes inside of [ 18.201595][ T266] freed 96-byte region [ffff888001926720, ffff888001926780) [ 18.202072][ T266] [ 18.202172][ T266] The buggy address belongs to the physical page: [ 18.202414][ T266] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 18.202759][ T266] flags: 0x80000000000000(node=0|zone=1) [ 18.202957][ T266] page_type: f5(slab) [ 18.203108][ T266] raw: 0080000000000000 ffff888001042340 ffffea0000047050 ffffea0000049090 [ 18.203452][ T266] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 18.203793][ T266] page dumped because: kasan: bad access detected [ 18.204029][ T266] [ 18.204124][ T266] Memory state around the buggy address: [ 18.204308][ T266] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 18.204590][ T266] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.204875][ T266] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 18.205153][ T266] ^ [ 18.205340][ T266] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.205617][ T266] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 18.205895][ T266] ================================================================== [ 18.206203][ T266] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr