[ 13.492249][ T233] ================================================================== [ 13.492591][ T233] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.492895][ T233] Read of size 1 at addr ffff88800192c720 by task modprobe/233 [ 13.493189][ T233] [ 13.493293][ T233] CPU: 0 UID: 0 PID: 233 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.493299][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.493302][ T233] Call Trace: [ 13.493304][ T233] [ 13.493306][ T233] dump_stack_lvl+0x82/0xd0 [ 13.493316][ T233] print_address_description.constprop.0+0x2c/0x400 [ 13.493324][ T233] ? emit_its_trampoline+0xa5/0x300 [ 13.493327][ T233] print_report+0xb4/0x270 [ 13.493331][ T233] ? emit_its_trampoline+0xa5/0x300 [ 13.493333][ T233] ? kasan_addr_to_slab+0x25/0x80 [ 13.493336][ T233] ? emit_its_trampoline+0xa5/0x300 [ 13.493339][ T233] kasan_report+0xca/0x100 [ 13.493343][ T233] ? emit_its_trampoline+0xa5/0x300 [ 13.493347][ T233] ? emit_its_trampoline+0xa5/0x300 [ 13.493350][ T233] __kasan_check_byte+0x3a/0x50 [ 13.493353][ T233] krealloc_noprof+0x3d/0x320 [ 13.493359][ T233] ? execmem_alloc+0xc0/0x240 [ 13.493365][ T233] emit_its_trampoline+0xa5/0x300 [ 13.493368][ T233] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.493376][ T233] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.493380][ T233] apply_retpolines+0xcf/0x550 [ 13.493384][ T233] ? __pfx_apply_retpolines+0x10/0x10 [ 13.493388][ T233] ? __pfx___mutex_lock+0x10/0x10 [ 13.493398][ T233] module_finalize+0x3d5/0x9d0 [ 13.493406][ T233] ? add_kallsyms+0x7bf/0xf40 [ 13.493411][ T233] ? __pfx_module_finalize+0x10/0x10 [ 13.493416][ T233] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.493419][ T233] ? __pfx_swap_ex+0x10/0x10 [ 13.493424][ T233] load_module+0x139a/0x2660 [ 13.493433][ T233] ? __pfx_load_module+0x10/0x10 [ 13.493437][ T233] ? kernel_read_file+0x3f5/0x550 [ 13.493443][ T233] ? kernel_read_file+0x3d0/0x550 [ 13.493446][ T233] ? __pfx_kernel_read_file+0x10/0x10 [ 13.493450][ T233] ? add_chain_cache+0x110/0x370 [ 13.493457][ T233] ? init_module_from_file+0xe9/0x150 [ 13.493460][ T233] init_module_from_file+0xe9/0x150 [ 13.493464][ T233] ? __pfx_init_module_from_file+0x10/0x10 [ 13.493473][ T233] ? idempotent_init_module+0x31a/0x620 [ 13.493476][ T233] ? __lock_release+0x5d/0x170 [ 13.493482][ T233] ? do_raw_spin_unlock+0x58/0x220 [ 13.493487][ T233] idempotent_init_module+0x335/0x620 [ 13.493491][ T233] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.493499][ T233] ? cap_capable+0x94/0x230 [ 13.493507][ T233] __x64_sys_finit_module+0xca/0x150 [ 13.493511][ T233] ? do_syscall_64+0x85/0x380 [ 13.493516][ T233] do_syscall_64+0xc1/0x380 [ 13.493519][ T233] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.493523][ T233] RIP: 0033:0x7fc395fb1e5d [ 13.493529][ T233] 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 [ 13.493532][ T233] RSP: 002b:00007ffcd96737f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.493536][ T233] RAX: ffffffffffffffda RBX: 000055cde6d00960 RCX: 00007fc395fb1e5d [ 13.493539][ T233] RDX: 0000000000000000 RSI: 000055cdc29d7a2a RDI: 0000000000000005 [ 13.493541][ T233] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffcd9673930 [ 13.493542][ T233] R10: 0000000000000005 R11: 0000000000000246 R12: 000055cdc29d7a2a [ 13.493544][ T233] R13: 000055cde6d00b10 R14: 000055cde6d00db0 R15: 0000000000000000 [ 13.493551][ T233] [ 13.493552][ T233] [ 13.505827][ T233] Allocated by task 231: [ 13.505982][ T233] kasan_save_stack+0x24/0x50 [ 13.506186][ T233] kasan_save_track+0x14/0x30 [ 13.506372][ T233] __kasan_kmalloc+0x7f/0x90 [ 13.506566][ T233] __kmalloc_noprof+0x1d4/0x470 [ 13.506766][ T233] virtqueue_add_split+0x6a3/0x1920 [ 13.506970][ T233] virtqueue_add_sgs+0x143/0x270 [ 13.507181][ T233] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.507389][ T233] virtio_fs_send_req+0x13a/0x710 [ 13.507587][ T233] __fuse_simple_request+0x22a/0xb50 [ 13.507788][ T233] fuse_readlink_folio+0x20b/0x400 [ 13.507997][ T233] fuse_get_link+0x12d/0x350 [ 13.508208][ T233] pick_link+0x7a2/0x1160 [ 13.508365][ T233] step_into+0x85a/0xfc0 [ 13.508519][ T233] link_path_walk+0x3c2/0xa10 [ 13.508731][ T233] path_openat+0x14d/0x380 [ 13.508933][ T233] do_filp_open+0x1d7/0x420 [ 13.509133][ T233] do_sys_openat2+0xd4/0x160 [ 13.509336][ T233] __x64_sys_openat+0x122/0x1e0 [ 13.509539][ T233] do_syscall_64+0xc1/0x380 [ 13.509738][ T233] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.509992][ T233] [ 13.510092][ T233] Freed by task 52: [ 13.510248][ T233] kasan_save_stack+0x24/0x50 [ 13.510454][ T233] kasan_save_track+0x14/0x30 [ 13.510654][ T233] kasan_save_free_info+0x3b/0x60 [ 13.510854][ T233] __kasan_slab_free+0x38/0x50 [ 13.511059][ T233] kfree+0x144/0x320 [ 13.511211][ T233] detach_buf_split+0x48d/0x6f0 [ 13.511410][ T233] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.511656][ T233] virtio_fs_requests_done_work+0x231/0x890 [ 13.511901][ T233] process_one_work+0xe43/0x1660 [ 13.512103][ T233] worker_thread+0x591/0xcf0 [ 13.512302][ T233] kthread+0x37b/0x600 [ 13.512459][ T233] ret_from_fork+0x243/0x320 [ 13.512659][ T233] ret_from_fork_asm+0x1a/0x30 [ 13.512861][ T233] [ 13.512960][ T233] The buggy address belongs to the object at ffff88800192c720 [ 13.512960][ T233] which belongs to the cache kmalloc-96 of size 96 [ 13.513443][ T233] The buggy address is located 0 bytes inside of [ 13.513443][ T233] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.513937][ T233] [ 13.514039][ T233] The buggy address belongs to the physical page: [ 13.514284][ T233] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.514636][ T233] flags: 0x80000000000000(node=0|zone=1) [ 13.514850][ T233] page_type: f5(slab) [ 13.515009][ T233] raw: 0080000000000000 ffff888001042340 ffffea0000257010 ffffea00004db450 [ 13.515374][ T233] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.515731][ T233] page dumped because: kasan: bad access detected [ 13.515980][ T233] [ 13.516073][ T233] Memory state around the buggy address: [ 13.516250][ T233] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.516532][ T233] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.516820][ T233] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.517112][ T233] ^ [ 13.517307][ T233] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.517598][ T233] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.517892][ T233] ================================================================== [ 13.518200][ T233] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr