[ 20.408135][ T269] ================================================================== [ 20.408491][ T269] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 20.408778][ T269] Read of size 1 at addr ffff888001926720 by task modprobe/269 [ 20.409072][ T269] [ 20.409179][ T269] CPU: 3 UID: 0 PID: 269 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 20.409185][ T269] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 20.409188][ T269] Call Trace: [ 20.409191][ T269] [ 20.409193][ T269] dump_stack_lvl+0x82/0xd0 [ 20.409203][ T269] print_address_description.constprop.0+0x2c/0x400 [ 20.409209][ T269] ? emit_its_trampoline+0xa5/0x300 [ 20.409213][ T269] print_report+0xb4/0x270 [ 20.409216][ T269] ? emit_its_trampoline+0xa5/0x300 [ 20.409220][ T269] ? kasan_addr_to_slab+0x25/0x80 [ 20.409226][ T269] ? emit_its_trampoline+0xa5/0x300 [ 20.409229][ T269] kasan_report+0xca/0x100 [ 20.409232][ T269] ? emit_its_trampoline+0xa5/0x300 [ 20.409239][ T269] ? emit_its_trampoline+0xa5/0x300 [ 20.409242][ T269] __kasan_check_byte+0x3a/0x50 [ 20.409245][ T269] krealloc_noprof+0x3d/0x320 [ 20.409252][ T269] ? execmem_alloc+0xc0/0x240 [ 20.409258][ T269] emit_its_trampoline+0xa5/0x300 [ 20.409262][ T269] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 20.409269][ T269] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 20.409273][ T269] apply_retpolines+0xcf/0x550 [ 20.409278][ T269] ? __pfx_apply_retpolines+0x10/0x10 [ 20.409282][ T269] ? __pfx___mutex_lock+0x10/0x10 [ 20.409294][ T269] module_finalize+0x3d5/0x9d0 [ 20.409300][ T269] ? add_kallsyms+0x7bf/0xf40 [ 20.409306][ T269] ? __pfx_module_finalize+0x10/0x10 [ 20.409310][ T269] ? __pfx_cmp_ex_sort+0x10/0x10 [ 20.409313][ T269] ? __pfx_swap_ex+0x10/0x10 [ 20.409318][ T269] load_module+0x139a/0x2660 [ 20.409325][ T269] ? __pfx_load_module+0x10/0x10 [ 20.409328][ T269] ? kernel_read_file+0x3f5/0x550 [ 20.409337][ T269] ? kernel_read_file+0x3d0/0x550 [ 20.409341][ T269] ? __pfx_kernel_read_file+0x10/0x10 [ 20.409345][ T269] ? add_chain_cache+0x110/0x370 [ 20.409351][ T269] ? init_module_from_file+0xe9/0x150 [ 20.409355][ T269] init_module_from_file+0xe9/0x150 [ 20.409358][ T269] ? __pfx_init_module_from_file+0x10/0x10 [ 20.409367][ T269] ? idempotent_init_module+0x31a/0x620 [ 20.409370][ T269] ? __lock_release+0x5d/0x170 [ 20.409375][ T269] ? do_raw_spin_unlock+0x58/0x220 [ 20.409380][ T269] idempotent_init_module+0x335/0x620 [ 20.409384][ T269] ? __pfx_idempotent_init_module+0x10/0x10 [ 20.409392][ T269] ? cap_capable+0x94/0x230 [ 20.409401][ T269] __x64_sys_finit_module+0xca/0x150 [ 20.409404][ T269] ? do_syscall_64+0x85/0x380 [ 20.409410][ T269] do_syscall_64+0xc1/0x380 [ 20.409413][ T269] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 20.409418][ T269] RIP: 0033:0x7f87a557fe5d [ 20.409424][ T269] 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 [ 20.409427][ T269] RSP: 002b:00007ffede6f1c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 20.409432][ T269] RAX: ffffffffffffffda RBX: 00005589d59a3960 RCX: 00007f87a557fe5d [ 20.409434][ T269] RDX: 0000000000000000 RSI: 00005589b5bb7a2a RDI: 0000000000000005 [ 20.409436][ T269] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffede6f1dd0 [ 20.409438][ T269] R10: 0000000000000005 R11: 0000000000000246 R12: 00005589b5bb7a2a [ 20.409440][ T269] R13: 00005589d59a3b10 R14: 00005589d59a3db0 R15: 0000000000000000 [ 20.409446][ T269] [ 20.409448][ T269] [ 20.421694][ T269] Allocated by task 269: [ 20.421849][ T269] kasan_save_stack+0x24/0x50 [ 20.422071][ T269] kasan_save_track+0x14/0x30 [ 20.422276][ T269] __kasan_kmalloc+0x7f/0x90 [ 20.422478][ T269] __kmalloc_noprof+0x1d4/0x470 [ 20.422682][ T269] virtqueue_add_split+0x6a7/0x1900 [ 20.422903][ T269] virtqueue_add_sgs+0x143/0x270 [ 20.423104][ T269] virtio_fs_enqueue_req+0x58c/0xfe0 [ 20.423306][ T269] virtio_fs_send_req+0x13a/0x710 [ 20.423504][ T269] __fuse_simple_request+0x22a/0xb50 [ 20.423706][ T269] fuse_readlink_folio+0x20b/0x400 [ 20.423909][ T269] fuse_get_link+0x12d/0x350 [ 20.424107][ T269] pick_link+0x7a2/0x1160 [ 20.424258][ T269] step_into+0x85a/0xfc0 [ 20.424413][ T269] link_path_walk+0x3c2/0xa10 [ 20.424609][ T269] path_lookupat+0x117/0x630 [ 20.424809][ T269] filename_lookup+0x1c4/0x470 [ 20.425007][ T269] vfs_statx+0xaa/0x2e0 [ 20.425160][ T269] vfs_fstatat+0x68/0xa0 [ 20.425309][ T269] __do_sys_newfstatat+0x6a/0xc0 [ 20.425506][ T269] do_syscall_64+0xc1/0x380 [ 20.425709][ T269] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 20.425965][ T269] [ 20.426067][ T269] Freed by task 23: [ 20.426218][ T269] kasan_save_stack+0x24/0x50 [ 20.426422][ T269] kasan_save_track+0x14/0x30 [ 20.426621][ T269] kasan_save_free_info+0x3b/0x60 [ 20.426825][ T269] __kasan_slab_free+0x38/0x50 [ 20.427028][ T269] kfree+0x144/0x320 [ 20.427180][ T269] detach_buf_split+0x48d/0x6f0 [ 20.427387][ T269] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 20.427638][ T269] virtio_fs_requests_done_work+0x231/0x890 [ 20.427886][ T269] process_one_work+0xe43/0x1660 [ 20.428092][ T269] worker_thread+0x591/0xcf0 [ 20.428291][ T269] kthread+0x37b/0x600 [ 20.428442][ T269] ret_from_fork+0x243/0x320 [ 20.428641][ T269] ret_from_fork_asm+0x1a/0x30 [ 20.428847][ T269] [ 20.428956][ T269] The buggy address belongs to the object at ffff888001926720 [ 20.428956][ T269] which belongs to the cache kmalloc-96 of size 96 [ 20.429436][ T269] The buggy address is located 0 bytes inside of [ 20.429436][ T269] freed 96-byte region [ffff888001926720, ffff888001926780) [ 20.429918][ T269] [ 20.430019][ T269] The buggy address belongs to the physical page: [ 20.430271][ T269] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 20.430625][ T269] flags: 0x80000000000000(node=0|zone=1) [ 20.430831][ T269] page_type: f5(slab) [ 20.430990][ T269] raw: 0080000000000000 ffff888001042340 ffffea00002b9590 ffffea000031fcd0 [ 20.431349][ T269] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 20.431717][ T269] page dumped because: kasan: bad access detected [ 20.431968][ T269] [ 20.432081][ T269] Memory state around the buggy address: [ 20.432276][ T269] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 20.432569][ T269] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 20.432862][ T269] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 20.433161][ T269] ^ [ 20.433359][ T269] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 20.433649][ T269] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 20.433939][ T269] ================================================================== [ 20.434315][ T269] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr