[ 13.557325][ T242] ================================================================== [ 13.557693][ T242] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.558010][ T242] Read of size 1 at addr ffff88800192c720 by task modprobe/242 [ 13.558323][ T242] [ 13.558444][ T242] CPU: 3 UID: 0 PID: 242 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.558449][ T242] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.558452][ T242] Call Trace: [ 13.558454][ T242] [ 13.558456][ T242] dump_stack_lvl+0x82/0xd0 [ 13.558464][ T242] print_address_description.constprop.0+0x2c/0x400 [ 13.558471][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.558474][ T242] print_report+0xb4/0x270 [ 13.558478][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.558480][ T242] ? kasan_addr_to_slab+0x25/0x80 [ 13.558483][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.558485][ T242] kasan_report+0xca/0x100 [ 13.558489][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.558494][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.558496][ T242] __kasan_check_byte+0x3a/0x50 [ 13.558499][ T242] krealloc_noprof+0x3d/0x320 [ 13.558503][ T242] ? execmem_alloc+0xc0/0x240 [ 13.558508][ T242] emit_its_trampoline+0xa5/0x300 [ 13.558511][ T242] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.558518][ T242] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.558521][ T242] apply_retpolines+0xcf/0x550 [ 13.558525][ T242] ? __pfx_apply_retpolines+0x10/0x10 [ 13.558528][ T242] ? __pfx___mutex_lock+0x10/0x10 [ 13.558539][ T242] module_finalize+0x3d5/0x9d0 [ 13.558546][ T242] ? add_kallsyms+0x7bf/0xf40 [ 13.558550][ T242] ? __pfx_module_finalize+0x10/0x10 [ 13.558554][ T242] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.558558][ T242] ? __pfx_swap_ex+0x10/0x10 [ 13.558562][ T242] load_module+0x139a/0x2660 [ 13.558570][ T242] ? __pfx_load_module+0x10/0x10 [ 13.558574][ T242] ? kernel_read_file+0x3f5/0x550 [ 13.558579][ T242] ? kernel_read_file+0x3d0/0x550 [ 13.558583][ T242] ? __pfx_kernel_read_file+0x10/0x10 [ 13.558586][ T242] ? add_chain_cache+0x110/0x370 [ 13.558592][ T242] ? init_module_from_file+0xe9/0x150 [ 13.558596][ T242] init_module_from_file+0xe9/0x150 [ 13.558599][ T242] ? __pfx_init_module_from_file+0x10/0x10 [ 13.558608][ T242] ? idempotent_init_module+0x31a/0x620 [ 13.558612][ T242] ? __lock_release+0x5d/0x170 [ 13.558617][ T242] ? do_raw_spin_unlock+0x58/0x220 [ 13.558621][ T242] idempotent_init_module+0x335/0x620 [ 13.558625][ T242] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.558633][ T242] ? cap_capable+0x94/0x230 [ 13.558640][ T242] __x64_sys_finit_module+0xca/0x150 [ 13.558643][ T242] ? do_syscall_64+0x85/0x380 [ 13.558647][ T242] do_syscall_64+0xc1/0x380 [ 13.558650][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.558654][ T242] RIP: 0033:0x7f2560189e5d [ 13.558659][ 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 [ 13.558662][ T242] RSP: 002b:00007ffecbc30c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.558666][ T242] RAX: ffffffffffffffda RBX: 000055f83f585960 RCX: 00007f2560189e5d [ 13.558668][ T242] RDX: 0000000000000000 RSI: 000055f80b577a2a RDI: 0000000000000005 [ 13.558670][ T242] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffecbc30d50 [ 13.558671][ T242] R10: 0000000000000005 R11: 0000000000000246 R12: 000055f80b577a2a [ 13.558673][ T242] R13: 000055f83f585b10 R14: 000055f83f585db0 R15: 0000000000000000 [ 13.558679][ T242] [ 13.558681][ T242] [ 13.571617][ T242] Allocated by task 220: [ 13.571776][ T242] kasan_save_stack+0x24/0x50 [ 13.571994][ T242] kasan_save_track+0x14/0x30 [ 13.572205][ T242] __kasan_kmalloc+0x7f/0x90 [ 13.572414][ T242] __kmalloc_noprof+0x1d4/0x470 [ 13.572627][ T242] virtqueue_add_split+0x6a3/0x1920 [ 13.572843][ T242] virtqueue_add_sgs+0x143/0x270 [ 13.573054][ T242] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.573266][ T242] virtio_fs_send_req+0x13a/0x710 [ 13.573482][ T242] __fuse_simple_request+0x22a/0xb50 [ 13.573695][ T242] fuse_readlink_folio+0x20b/0x400 [ 13.573908][ T242] fuse_get_link+0x12d/0x350 [ 13.574119][ T242] pick_link+0x7a2/0x1160 [ 13.574281][ T242] step_into+0x85a/0xfc0 [ 13.574440][ T242] link_path_walk+0x3c2/0xa10 [ 13.574650][ T242] path_lookupat+0x117/0x630 [ 13.574859][ T242] filename_lookup+0x1c4/0x470 [ 13.575075][ T242] vfs_statx+0xaa/0x2e0 [ 13.575237][ T242] vfs_fstatat+0x68/0xa0 [ 13.575396][ T242] __do_sys_newfstatat+0x6a/0xc0 [ 13.575613][ T242] do_syscall_64+0xc1/0x380 [ 13.575822][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.576085][ T242] [ 13.576197][ T242] Freed by task 65: [ 13.576352][ T242] kasan_save_stack+0x24/0x50 [ 13.576568][ T242] kasan_save_track+0x14/0x30 [ 13.576782][ T242] kasan_save_free_info+0x3b/0x60 [ 13.576993][ T242] __kasan_slab_free+0x38/0x50 [ 13.577204][ T242] kfree+0x144/0x320 [ 13.577363][ T242] detach_buf_split+0x48d/0x6f0 [ 13.577575][ T242] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.577836][ T242] virtio_fs_requests_done_work+0x231/0x890 [ 13.578099][ T242] process_one_work+0xe43/0x1660 [ 13.578314][ T242] worker_thread+0x591/0xcf0 [ 13.578549][ T242] kthread+0x37b/0x600 [ 13.578709][ T242] ret_from_fork+0x243/0x320 [ 13.578920][ T242] ret_from_fork_asm+0x1a/0x30 [ 13.579130][ T242] [ 13.579236][ T242] The buggy address belongs to the object at ffff88800192c720 [ 13.579236][ T242] which belongs to the cache kmalloc-96 of size 96 [ 13.579757][ T242] The buggy address is located 0 bytes inside of [ 13.579757][ T242] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.580264][ T242] [ 13.580370][ T242] The buggy address belongs to the physical page: [ 13.580628][ T242] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.581001][ T242] flags: 0x80000000000000(node=0|zone=1) [ 13.581227][ T242] page_type: f5(slab) [ 13.581392][ T242] raw: 0080000000000000 ffff888001042340 ffffea0000160d90 ffffea0000042fd0 [ 13.581770][ T242] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.582145][ T242] page dumped because: kasan: bad access detected [ 13.582404][ T242] [ 13.582508][ T242] Memory state around the buggy address: [ 13.582716][ T242] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.583023][ T242] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.583326][ T242] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.583637][ T242] ^ [ 13.583842][ T242] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.584151][ T242] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.584460][ T242] ================================================================== [ 13.584834][ T242] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr