[ 13.678011][ T247] ================================================================== [ 13.678363][ T247] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.678621][ T247] Read of size 1 at addr ffff88800192c720 by task modprobe/247 [ 13.678869][ T247] [ 13.678957][ T247] CPU: 0 UID: 0 PID: 247 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.678962][ T247] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.678964][ T247] Call Trace: [ 13.678966][ T247] [ 13.678968][ T247] dump_stack_lvl+0x82/0xd0 [ 13.678978][ T247] print_address_description.constprop.0+0x2c/0x400 [ 13.678986][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.678990][ T247] print_report+0xb4/0x270 [ 13.678993][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.678995][ T247] ? kasan_addr_to_slab+0x25/0x80 [ 13.678999][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.679001][ T247] kasan_report+0xca/0x100 [ 13.679004][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.679009][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.679011][ T247] __kasan_check_byte+0x3a/0x50 [ 13.679015][ T247] krealloc_noprof+0x3d/0x320 [ 13.679020][ T247] ? execmem_alloc+0xc0/0x240 [ 13.679026][ T247] emit_its_trampoline+0xa5/0x300 [ 13.679029][ T247] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.679036][ T247] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.679040][ T247] apply_retpolines+0xcf/0x550 [ 13.679044][ T247] ? rcu_is_watching+0x12/0xc0 [ 13.679052][ T247] ? __pfx_apply_retpolines+0x10/0x10 [ 13.679055][ T247] ? __pfx___mutex_lock+0x10/0x10 [ 13.679062][ T247] ? memcmp+0x70/0x1d0 [ 13.679068][ T247] module_finalize+0x3d5/0x9d0 [ 13.679077][ T247] ? add_kallsyms+0x7bf/0xf40 [ 13.679082][ T247] ? __pfx_module_finalize+0x10/0x10 [ 13.679086][ T247] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.679089][ T247] ? __pfx_swap_ex+0x10/0x10 [ 13.679094][ T247] load_module+0x139a/0x2660 [ 13.679103][ T247] ? __pfx_load_module+0x10/0x10 [ 13.679106][ T247] ? kernel_read_file+0x3f5/0x550 [ 13.679112][ T247] ? kernel_read_file+0x3d0/0x550 [ 13.679116][ T247] ? __pfx_kernel_read_file+0x10/0x10 [ 13.679119][ T247] ? add_chain_cache+0x110/0x370 [ 13.679126][ T247] ? init_module_from_file+0xe9/0x150 [ 13.679130][ T247] init_module_from_file+0xe9/0x150 [ 13.679133][ T247] ? __pfx_init_module_from_file+0x10/0x10 [ 13.679142][ T247] ? idempotent_init_module+0x31a/0x620 [ 13.679146][ T247] ? __lock_release+0x5d/0x170 [ 13.679151][ T247] ? do_raw_spin_unlock+0x58/0x220 [ 13.679155][ T247] idempotent_init_module+0x335/0x620 [ 13.679160][ T247] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.679167][ T247] ? cap_capable+0x94/0x230 [ 13.679176][ T247] __x64_sys_finit_module+0xca/0x150 [ 13.679180][ T247] ? do_syscall_64+0x85/0x380 [ 13.679185][ T247] do_syscall_64+0xc1/0x380 [ 13.679188][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.679192][ T247] RIP: 0033:0x7f69eadcbe5d [ 13.679196][ T247] 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 [ 13.679199][ T247] RSP: 002b:00007ffff0e0ce48 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.679203][ T247] RAX: ffffffffffffffda RBX: 0000564b253e5960 RCX: 00007f69eadcbe5d [ 13.679205][ T247] RDX: 0000000000000000 RSI: 0000564aff7eca2a RDI: 0000000000000005 [ 13.679207][ T247] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffff0e0cf80 [ 13.679209][ T247] R10: 0000000000000005 R11: 0000000000000246 R12: 0000564aff7eca2a [ 13.679211][ T247] R13: 0000564b253e5b10 R14: 0000564b253e5db0 R15: 0000000000000000 [ 13.679217][ T247] [ 13.679218][ T247] [ 13.689881][ T247] Allocated by task 240: [ 13.690012][ T247] kasan_save_stack+0x24/0x50 [ 13.690188][ T247] kasan_save_track+0x14/0x30 [ 13.690357][ T247] __kasan_kmalloc+0x7f/0x90 [ 13.690526][ T247] __kmalloc_noprof+0x1d4/0x470 [ 13.690696][ T247] virtqueue_add_split+0x6a3/0x1920 [ 13.690872][ T247] virtqueue_add_sgs+0x143/0x270 [ 13.691041][ T247] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.691216][ T247] virtio_fs_send_req+0x13a/0x710 [ 13.691385][ T247] __fuse_simple_request+0x22a/0xb50 [ 13.691559][ T247] fuse_readlink_folio+0x20b/0x400 [ 13.691752][ T247] fuse_get_link+0x12d/0x350 [ 13.691924][ T247] pick_link+0x7a2/0x1160 [ 13.692056][ T247] step_into+0x85a/0xfc0 [ 13.692185][ T247] link_path_walk+0x3c2/0xa10 [ 13.692354][ T247] path_lookupat+0x117/0x630 [ 13.692529][ T247] filename_lookup+0x1c4/0x470 [ 13.692701][ T247] vfs_statx+0xaa/0x2e0 [ 13.692833][ T247] vfs_fstatat+0x68/0xa0 [ 13.692961][ T247] __do_sys_newfstatat+0x6a/0xc0 [ 13.693130][ T247] do_syscall_64+0xc1/0x380 [ 13.693303][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.693515][ T247] [ 13.693600][ T247] Freed by task 62: [ 13.693729][ T247] kasan_save_stack+0x24/0x50 [ 13.693900][ T247] kasan_save_track+0x14/0x30 [ 13.694070][ T247] kasan_save_free_info+0x3b/0x60 [ 13.694241][ T247] __kasan_slab_free+0x38/0x50 [ 13.694410][ T247] kfree+0x144/0x320 [ 13.694539][ T247] detach_buf_split+0x48d/0x6f0 [ 13.694709][ T247] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.694920][ T247] virtio_fs_requests_done_work+0x231/0x890 [ 13.695133][ T247] process_one_work+0xe43/0x1660 [ 13.695306][ T247] worker_thread+0x591/0xcf0 [ 13.695476][ T247] kthread+0x37b/0x600 [ 13.695606][ T247] ret_from_fork+0x243/0x320 [ 13.695778][ T247] ret_from_fork_asm+0x1a/0x30 [ 13.695952][ T247] [ 13.696037][ T247] The buggy address belongs to the object at ffff88800192c720 [ 13.696037][ T247] which belongs to the cache kmalloc-96 of size 96 [ 13.696447][ T247] The buggy address is located 0 bytes inside of [ 13.696447][ T247] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.696854][ T247] [ 13.696940][ T247] The buggy address belongs to the physical page: [ 13.697145][ T247] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.697449][ T247] flags: 0x80000000000000(node=0|zone=1) [ 13.697624][ T247] page_type: f5(slab) [ 13.697759][ T247] raw: 0080000000000000 ffff888001042340 ffffea000013f6d0 ffffea0000140890 [ 13.698066][ T247] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.698369][ T247] page dumped because: kasan: bad access detected [ 13.698580][ T247] [ 13.698667][ T247] Memory state around the buggy address: [ 13.698831][ T247] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.699079][ T247] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.699326][ T247] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.699573][ T247] ^ [ 13.699738][ T247] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.699983][ T247] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.700230][ T247] ================================================================== [ 13.700525][ T247] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr