[ 18.355200][ T267] ================================================================== [ 18.355542][ T267] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 18.355842][ T267] Read of size 1 at addr ffff888001926720 by task modprobe/267 [ 18.356144][ T267] [ 18.356248][ T267] CPU: 2 UID: 0 PID: 267 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 18.356253][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.356256][ T267] Call Trace: [ 18.356258][ T267] [ 18.356260][ T267] dump_stack_lvl+0x82/0xd0 [ 18.356269][ T267] print_address_description.constprop.0+0x2c/0x400 [ 18.356276][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.356280][ T267] print_report+0xb4/0x270 [ 18.356283][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.356286][ T267] ? kasan_addr_to_slab+0x25/0x80 [ 18.356291][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.356294][ T267] kasan_report+0xca/0x100 [ 18.356298][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.356304][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.356307][ T267] __kasan_check_byte+0x3a/0x50 [ 18.356310][ T267] krealloc_noprof+0x3d/0x320 [ 18.356316][ T267] ? execmem_alloc+0xc0/0x240 [ 18.356321][ T267] emit_its_trampoline+0xa5/0x300 [ 18.356325][ T267] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 18.356333][ T267] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 18.356336][ T267] apply_retpolines+0xcf/0x550 [ 18.356342][ T267] ? __pfx_apply_retpolines+0x10/0x10 [ 18.356345][ T267] ? __pfx___mutex_lock+0x10/0x10 [ 18.356356][ T267] module_finalize+0x3d5/0x9d0 [ 18.356362][ T267] ? add_kallsyms+0x7bf/0xf40 [ 18.356369][ T267] ? __pfx_module_finalize+0x10/0x10 [ 18.356373][ T267] ? __pfx_cmp_ex_sort+0x10/0x10 [ 18.356376][ T267] ? __pfx_swap_ex+0x10/0x10 [ 18.356380][ T267] load_module+0x139a/0x2660 [ 18.356388][ T267] ? __pfx_load_module+0x10/0x10 [ 18.356391][ T267] ? kernel_read_file+0x3f5/0x550 [ 18.356400][ T267] ? kernel_read_file+0x3d0/0x550 [ 18.356405][ T267] ? __pfx_kernel_read_file+0x10/0x10 [ 18.356408][ T267] ? add_chain_cache+0x110/0x370 [ 18.356414][ T267] ? init_module_from_file+0xe9/0x150 [ 18.356418][ T267] init_module_from_file+0xe9/0x150 [ 18.356421][ T267] ? __pfx_init_module_from_file+0x10/0x10 [ 18.356430][ T267] ? idempotent_init_module+0x31a/0x620 [ 18.356433][ T267] ? __lock_release+0x5d/0x170 [ 18.356438][ T267] ? do_raw_spin_unlock+0x58/0x220 [ 18.356442][ T267] idempotent_init_module+0x335/0x620 [ 18.356446][ T267] ? __pfx_idempotent_init_module+0x10/0x10 [ 18.356453][ T267] ? cap_capable+0x94/0x230 [ 18.356461][ T267] __x64_sys_finit_module+0xca/0x150 [ 18.356464][ T267] ? do_syscall_64+0x85/0x380 [ 18.356469][ T267] do_syscall_64+0xc1/0x380 [ 18.356472][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.356476][ T267] RIP: 0033:0x7fdcd007ee5d [ 18.356482][ 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 [ 18.356485][ T267] RSP: 002b:00007fff7d59c058 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 18.356489][ T267] RAX: ffffffffffffffda RBX: 000055b5c06f9960 RCX: 00007fdcd007ee5d [ 18.356492][ T267] RDX: 0000000000000000 RSI: 000055b5bb587a2a RDI: 0000000000000005 [ 18.356494][ T267] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff7d59c190 [ 18.356496][ T267] R10: 0000000000000005 R11: 0000000000000246 R12: 000055b5bb587a2a [ 18.356497][ T267] R13: 000055b5c06f9b10 R14: 000055b5c06f9db0 R15: 0000000000000000 [ 18.356504][ T267] [ 18.356505][ T267] [ 18.368404][ T267] Allocated by task 256: [ 18.368548][ T267] kasan_save_stack+0x24/0x50 [ 18.368755][ T267] kasan_save_track+0x14/0x30 [ 18.368972][ T267] __kasan_kmalloc+0x7f/0x90 [ 18.369178][ T267] __kmalloc_noprof+0x1d4/0x470 [ 18.369376][ T267] virtqueue_add_split+0x6a3/0x1920 [ 18.369573][ T267] virtqueue_add_sgs+0x143/0x270 [ 18.369772][ T267] virtio_fs_enqueue_req+0x58c/0xfe0 [ 18.369982][ T267] virtio_fs_send_req+0x13a/0x710 [ 18.370197][ T267] __fuse_simple_request+0x22a/0xb50 [ 18.370390][ T267] fuse_readlink_folio+0x20b/0x400 [ 18.370581][ T267] fuse_get_link+0x12d/0x350 [ 18.370779][ T267] pick_link+0x7a2/0x1160 [ 18.370923][ T267] step_into+0x85a/0xfc0 [ 18.371071][ T267] link_path_walk+0x3c2/0xa10 [ 18.371260][ T267] path_lookupat+0x117/0x630 [ 18.371450][ T267] filename_lookup+0x1c4/0x470 [ 18.371645][ T267] vfs_statx+0xaa/0x2e0 [ 18.371793][ T267] vfs_fstatat+0x68/0xa0 [ 18.371936][ T267] __do_sys_newfstatat+0x6a/0xc0 [ 18.372138][ T267] do_syscall_64+0xc1/0x380 [ 18.372331][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.372568][ T267] [ 18.372663][ T267] Freed by task 201: [ 18.372809][ T267] kasan_save_stack+0x24/0x50 [ 18.373008][ T267] kasan_save_track+0x14/0x30 [ 18.373208][ T267] kasan_save_free_info+0x3b/0x60 [ 18.373401][ T267] __kasan_slab_free+0x38/0x50 [ 18.373591][ T267] kfree+0x144/0x320 [ 18.373738][ T267] detach_buf_split+0x48d/0x6f0 [ 18.373931][ T267] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 18.374177][ T267] virtio_fs_requests_done_work+0x231/0x890 [ 18.374413][ T267] process_one_work+0xe43/0x1660 [ 18.374609][ T267] worker_thread+0x591/0xcf0 [ 18.374799][ T267] kthread+0x37b/0x600 [ 18.374944][ T267] ret_from_fork+0x243/0x320 [ 18.375149][ T267] ret_from_fork_asm+0x1a/0x30 [ 18.375343][ T267] [ 18.375438][ T267] The buggy address belongs to the object at ffff888001926720 [ 18.375438][ T267] which belongs to the cache kmalloc-96 of size 96 [ 18.375905][ T267] The buggy address is located 0 bytes inside of [ 18.375905][ T267] freed 96-byte region [ffff888001926720, ffff888001926780) [ 18.376378][ T267] [ 18.376475][ T267] The buggy address belongs to the physical page: [ 18.376710][ T267] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 18.377049][ T267] flags: 0x80000000000000(node=0|zone=1) [ 18.377261][ T267] page_type: f5(slab) [ 18.377408][ T267] raw: 0080000000000000 ffff888001042340 ffffea000007da90 ffffea000009b4d0 [ 18.377739][ T267] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 18.378070][ T267] page dumped because: kasan: bad access detected [ 18.378295][ T267] [ 18.378386][ T267] Memory state around the buggy address: [ 18.378572][ T267] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 18.378881][ T267] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.379191][ T267] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 18.379472][ T267] ^ [ 18.379663][ T267] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.379957][ T267] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 18.380245][ T267] ================================================================== [ 18.380653][ T267] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr