[ 17.429763][ T267] ================================================================== [ 17.430267][ T267] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 17.430709][ T267] Read of size 1 at addr ffff888001926720 by task modprobe/267 [ 17.431082][ T267] [ 17.431182][ T267] CPU: 1 UID: 0 PID: 267 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 17.431187][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.431189][ T267] Call Trace: [ 17.431191][ T267] [ 17.431193][ T267] dump_stack_lvl+0x82/0xd0 [ 17.431201][ T267] print_address_description.constprop.0+0x2c/0x400 [ 17.431206][ T267] ? emit_its_trampoline+0xa5/0x300 [ 17.431210][ T267] print_report+0xb4/0x270 [ 17.431212][ T267] ? emit_its_trampoline+0xa5/0x300 [ 17.431215][ T267] ? kasan_addr_to_slab+0x25/0x80 [ 17.431220][ T267] ? emit_its_trampoline+0xa5/0x300 [ 17.431223][ T267] kasan_report+0xca/0x100 [ 17.431226][ T267] ? emit_its_trampoline+0xa5/0x300 [ 17.431232][ T267] ? emit_its_trampoline+0xa5/0x300 [ 17.431235][ T267] __kasan_check_byte+0x3a/0x50 [ 17.431238][ T267] krealloc_noprof+0x3d/0x320 [ 17.431242][ T267] ? execmem_alloc+0xc0/0x240 [ 17.431247][ T267] emit_its_trampoline+0xa5/0x300 [ 17.431250][ T267] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 17.431256][ T267] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 17.431260][ T267] apply_retpolines+0xcf/0x550 [ 17.431265][ T267] ? __pfx_apply_retpolines+0x10/0x10 [ 17.431268][ T267] ? __pfx___mutex_lock+0x10/0x10 [ 17.431279][ T267] module_finalize+0x3d5/0x9d0 [ 17.431285][ T267] ? add_kallsyms+0x7bf/0xf40 [ 17.431291][ T267] ? __pfx_module_finalize+0x10/0x10 [ 17.431294][ T267] ? __pfx_cmp_ex_sort+0x10/0x10 [ 17.431298][ T267] ? __pfx_swap_ex+0x10/0x10 [ 17.431302][ T267] load_module+0x139a/0x2660 [ 17.431310][ T267] ? __pfx_load_module+0x10/0x10 [ 17.431313][ T267] ? kernel_read_file+0x3f5/0x550 [ 17.431320][ T267] ? kernel_read_file+0x3d0/0x550 [ 17.431324][ T267] ? __pfx_kernel_read_file+0x10/0x10 [ 17.431328][ T267] ? add_chain_cache+0x110/0x370 [ 17.431333][ T267] ? init_module_from_file+0xe9/0x150 [ 17.431337][ T267] init_module_from_file+0xe9/0x150 [ 17.431340][ T267] ? __pfx_init_module_from_file+0x10/0x10 [ 17.431348][ T267] ? idempotent_init_module+0x31a/0x620 [ 17.431352][ T267] ? __lock_release+0x5d/0x170 [ 17.431356][ T267] ? do_raw_spin_unlock+0x58/0x220 [ 17.431361][ T267] idempotent_init_module+0x335/0x620 [ 17.431365][ T267] ? __pfx_idempotent_init_module+0x10/0x10 [ 17.431372][ T267] ? cap_capable+0x94/0x230 [ 17.431379][ T267] __x64_sys_finit_module+0xca/0x150 [ 17.431382][ T267] ? do_syscall_64+0x85/0x380 [ 17.431386][ T267] do_syscall_64+0xc1/0x380 [ 17.431390][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.431393][ T267] RIP: 0033:0x7f3f7b7e7e5d [ 17.431398][ T267] 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 [ 17.431400][ T267] RSP: 002b:00007ffebb220128 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 17.431404][ T267] RAX: ffffffffffffffda RBX: 00005578f220c960 RCX: 00007f3f7b7e7e5d [ 17.431407][ T267] RDX: 0000000000000000 RSI: 00005578ce310a2a RDI: 0000000000000005 [ 17.431408][ T267] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffebb220260 [ 17.431410][ T267] R10: 0000000000000005 R11: 0000000000000246 R12: 00005578ce310a2a [ 17.431412][ T267] R13: 00005578f220cb10 R14: 00005578f220cdb0 R15: 0000000000000000 [ 17.431418][ T267] [ 17.431420][ T267] [ 17.443208][ T267] Allocated by task 254: [ 17.443350][ T267] kasan_save_stack+0x24/0x50 [ 17.443543][ T267] kasan_save_track+0x14/0x30 [ 17.443732][ T267] __kasan_kmalloc+0x7f/0x90 [ 17.443930][ T267] __kmalloc_noprof+0x1d4/0x470 [ 17.444121][ T267] virtqueue_add_split+0x6a3/0x1920 [ 17.444315][ T267] virtqueue_add_sgs+0x143/0x270 [ 17.444506][ T267] virtio_fs_enqueue_req+0x58c/0xfe0 [ 17.444695][ T267] virtio_fs_send_req+0x13a/0x710 [ 17.444886][ T267] __fuse_simple_request+0x22a/0xb50 [ 17.445078][ T267] fuse_file_put+0x170/0x1f0 [ 17.445267][ T267] fuse_release+0x134/0x1c0 [ 17.445456][ T267] __fput+0x35c/0xa80 [ 17.445599][ T267] task_work_run+0x134/0x220 [ 17.445798][ T267] exit_to_user_mode_loop+0xd1/0xe0 [ 17.445986][ T267] do_syscall_64+0x2fe/0x380 [ 17.446173][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 17.446408][ T267] [ 17.446502][ T267] Freed by task 202: [ 17.446642][ T267] kasan_save_stack+0x24/0x50 [ 17.446830][ T267] kasan_save_track+0x14/0x30 [ 17.447015][ T267] kasan_save_free_info+0x3b/0x60 [ 17.447204][ T267] __kasan_slab_free+0x38/0x50 [ 17.447406][ T267] kfree+0x144/0x320 [ 17.447553][ T267] detach_buf_split+0x48d/0x6f0 [ 17.447750][ T267] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 17.447987][ T267] virtio_fs_requests_done_work+0x231/0x890 [ 17.448225][ T267] process_one_work+0xe43/0x1660 [ 17.448426][ T267] worker_thread+0x591/0xcf0 [ 17.448610][ T267] kthread+0x37b/0x600 [ 17.448750][ T267] ret_from_fork+0x243/0x320 [ 17.448937][ T267] ret_from_fork_asm+0x1a/0x30 [ 17.449124][ T267] [ 17.449221][ T267] The buggy address belongs to the object at ffff888001926720 [ 17.449221][ T267] which belongs to the cache kmalloc-96 of size 96 [ 17.449665][ T267] The buggy address is located 0 bytes inside of [ 17.449665][ T267] freed 96-byte region [ffff888001926720, ffff888001926780) [ 17.450109][ T267] [ 17.450203][ T267] The buggy address belongs to the physical page: [ 17.450457][ T267] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 17.450785][ T267] flags: 0x80000000000000(node=0|zone=1) [ 17.450977][ T267] page_type: f5(slab) [ 17.451121][ T267] raw: 0080000000000000 ffff888001042340 ffffea0000047050 ffffea0000049090 [ 17.451455][ T267] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 17.451788][ T267] page dumped because: kasan: bad access detected [ 17.452018][ T267] [ 17.452110][ T267] Memory state around the buggy address: [ 17.452292][ T267] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 17.452568][ T267] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.452839][ T267] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 17.453118][ T267] ^ [ 17.453300][ T267] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 17.453569][ T267] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 17.453838][ T267] ================================================================== [ 17.454156][ T267] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr