[ 16.358341][ T266] ================================================================== [ 16.358713][ T266] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.358990][ T266] Read of size 1 at addr ffff888001926720 by task modprobe/266 [ 16.359247][ T266] [ 16.359342][ T266] CPU: 3 UID: 0 PID: 266 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.359347][ T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.359349][ T266] Call Trace: [ 16.359351][ T266] [ 16.359353][ T266] dump_stack_lvl+0x82/0xd0 [ 16.359360][ T266] print_address_description.constprop.0+0x2c/0x400 [ 16.359366][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.359369][ T266] print_report+0xb4/0x270 [ 16.359372][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.359375][ T266] ? kasan_addr_to_slab+0x25/0x80 [ 16.359380][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.359383][ T266] kasan_report+0xca/0x100 [ 16.359387][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.359392][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.359395][ T266] __kasan_check_byte+0x3a/0x50 [ 16.359398][ T266] krealloc_noprof+0x3d/0x320 [ 16.359404][ T266] ? execmem_alloc+0xc0/0x240 [ 16.359408][ T266] emit_its_trampoline+0xa5/0x300 [ 16.359412][ T266] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.359419][ T266] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.359423][ T266] apply_retpolines+0xcf/0x550 [ 16.359428][ T266] ? __pfx_apply_retpolines+0x10/0x10 [ 16.359431][ T266] ? __pfx___mutex_lock+0x10/0x10 [ 16.359441][ T266] module_finalize+0x3d5/0x9d0 [ 16.359447][ T266] ? add_kallsyms+0x7bf/0xf40 [ 16.359452][ T266] ? __pfx_module_finalize+0x10/0x10 [ 16.359456][ T266] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.359459][ T266] ? __pfx_swap_ex+0x10/0x10 [ 16.359464][ T266] load_module+0x139a/0x2660 [ 16.359471][ T266] ? __pfx_load_module+0x10/0x10 [ 16.359474][ T266] ? kernel_read_file+0x3f5/0x550 [ 16.359482][ T266] ? kernel_read_file+0x3d0/0x550 [ 16.359486][ T266] ? __pfx_kernel_read_file+0x10/0x10 [ 16.359490][ T266] ? add_chain_cache+0x110/0x370 [ 16.359496][ T266] ? init_module_from_file+0xe9/0x150 [ 16.359499][ T266] init_module_from_file+0xe9/0x150 [ 16.359502][ T266] ? __pfx_init_module_from_file+0x10/0x10 [ 16.359511][ T266] ? idempotent_init_module+0x31a/0x620 [ 16.359514][ T266] ? __lock_release+0x5d/0x170 [ 16.359518][ T266] ? do_raw_spin_unlock+0x58/0x220 [ 16.359523][ T266] idempotent_init_module+0x335/0x620 [ 16.359527][ T266] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.359534][ T266] ? cap_capable+0x94/0x230 [ 16.359541][ T266] __x64_sys_finit_module+0xca/0x150 [ 16.359544][ T266] ? do_syscall_64+0x85/0x380 [ 16.359549][ T266] do_syscall_64+0xc1/0x380 [ 16.359552][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.359555][ T266] RIP: 0033:0x7f35113b2e5d [ 16.359559][ T266] 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 [ 16.359562][ T266] RSP: 002b:00007ffdf4ef3af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.359567][ T266] RAX: ffffffffffffffda RBX: 000055d6f3f18960 RCX: 00007f35113b2e5d [ 16.359569][ T266] RDX: 0000000000000000 RSI: 000055d6b94cea2a RDI: 0000000000000005 [ 16.359571][ T266] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffdf4ef3c30 [ 16.359573][ T266] R10: 0000000000000005 R11: 0000000000000246 R12: 000055d6b94cea2a [ 16.359574][ T266] R13: 000055d6f3f18b10 R14: 000055d6f3f18db0 R15: 0000000000000000 [ 16.359581][ T266] [ 16.359582][ T266] [ 16.370044][ T266] Allocated by task 238: [ 16.370172][ T266] kasan_save_stack+0x24/0x50 [ 16.370357][ T266] kasan_save_track+0x14/0x30 [ 16.370528][ T266] __kasan_kmalloc+0x7f/0x90 [ 16.370698][ T266] __kmalloc_noprof+0x1d4/0x470 [ 16.370874][ T266] virtqueue_add_split+0x6a3/0x1920 [ 16.371054][ T266] virtqueue_add_sgs+0x143/0x270 [ 16.371226][ T266] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.371399][ T266] virtio_fs_send_req+0x13a/0x710 [ 16.371574][ T266] __fuse_simple_request+0x22a/0xb50 [ 16.371747][ T266] fuse_readlink_folio+0x20b/0x400 [ 16.371919][ T266] fuse_get_link+0x12d/0x350 [ 16.372090][ T266] pick_link+0x7a2/0x1160 [ 16.372220][ T266] step_into+0x85a/0xfc0 [ 16.372349][ T266] link_path_walk+0x3c2/0xa10 [ 16.372521][ T266] path_lookupat+0x117/0x630 [ 16.372694][ T266] filename_lookup+0x1c4/0x470 [ 16.372864][ T266] vfs_statx+0xaa/0x2e0 [ 16.372993][ T266] vfs_fstatat+0x68/0xa0 [ 16.373124][ T266] __do_sys_newfstatat+0x6a/0xc0 [ 16.373295][ T266] do_syscall_64+0xc1/0x380 [ 16.373466][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.373678][ T266] [ 16.373765][ T266] Freed by task 61: [ 16.373890][ T266] kasan_save_stack+0x24/0x50 [ 16.374071][ T266] kasan_save_track+0x14/0x30 [ 16.374241][ T266] kasan_save_free_info+0x3b/0x60 [ 16.374413][ T266] __kasan_slab_free+0x38/0x50 [ 16.374584][ T266] kfree+0x144/0x320 [ 16.374714][ T266] detach_buf_split+0x48d/0x6f0 [ 16.374884][ T266] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.375096][ T266] virtio_fs_requests_done_work+0x231/0x890 [ 16.375311][ T266] process_one_work+0xe43/0x1660 [ 16.375482][ T266] worker_thread+0x591/0xcf0 [ 16.375652][ T266] kthread+0x37b/0x600 [ 16.375782][ T266] ret_from_fork+0x243/0x320 [ 16.375958][ T266] ret_from_fork_asm+0x1a/0x30 [ 16.376159][ T266] [ 16.376247][ T266] The buggy address belongs to the object at ffff888001926720 [ 16.376247][ T266] which belongs to the cache kmalloc-96 of size 96 [ 16.376670][ T266] The buggy address is located 0 bytes inside of [ 16.376670][ T266] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.377098][ T266] [ 16.377197][ T266] The buggy address belongs to the physical page: [ 16.377406][ T266] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888001926720 pfn:0x1926 [ 16.377759][ T266] flags: 0x80000000000200(workingset|node=0|zone=1) [ 16.377981][ T266] page_type: f5(slab) [ 16.378116][ T266] raw: 0080000000000200 ffff888001042340 ffffea000025b1d0 ffffea0000047050 [ 16.378428][ T266] raw: ffff888001926720 000000000010000e 00000000f5000000 0000000000000000 [ 16.378733][ T266] page dumped because: kasan: bad access detected [ 16.378943][ T266] [ 16.379030][ T266] Memory state around the buggy address: [ 16.379201][ T266] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.379451][ T266] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.379698][ T266] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.379947][ T266] ^ [ 16.380119][ T266] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.380366][ T266] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.380614][ T266] ================================================================== [ 16.380951][ T266] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr