[ 13.979067][ T242] ================================================================== [ 13.979386][ T242] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.979638][ T242] Read of size 1 at addr ffff88800192c720 by task modprobe/242 [ 13.979899][ T242] [ 13.979985][ T242] CPU: 1 UID: 0 PID: 242 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.979990][ T242] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.979992][ T242] Call Trace: [ 13.979994][ T242] [ 13.979996][ T242] dump_stack_lvl+0x82/0xd0 [ 13.980004][ T242] print_address_description.constprop.0+0x2c/0x400 [ 13.980011][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.980014][ T242] print_report+0xb4/0x270 [ 13.980017][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.980019][ T242] ? kasan_addr_to_slab+0x25/0x80 [ 13.980022][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.980025][ T242] kasan_report+0xca/0x100 [ 13.980028][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.980033][ T242] ? emit_its_trampoline+0xa5/0x300 [ 13.980035][ T242] __kasan_check_byte+0x3a/0x50 [ 13.980039][ T242] krealloc_noprof+0x3d/0x320 [ 13.980042][ T242] ? execmem_alloc+0xc0/0x240 [ 13.980047][ T242] emit_its_trampoline+0xa5/0x300 [ 13.980050][ T242] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.980057][ T242] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.980060][ T242] apply_retpolines+0xcf/0x550 [ 13.980064][ T242] ? __pfx_apply_retpolines+0x10/0x10 [ 13.980067][ T242] ? __pfx___mutex_lock+0x10/0x10 [ 13.980077][ T242] module_finalize+0x3d5/0x9d0 [ 13.980084][ T242] ? add_kallsyms+0x7bf/0xf40 [ 13.980089][ T242] ? __pfx_module_finalize+0x10/0x10 [ 13.980093][ T242] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.980096][ T242] ? __pfx_swap_ex+0x10/0x10 [ 13.980101][ T242] load_module+0x139a/0x2660 [ 13.980109][ T242] ? __pfx_load_module+0x10/0x10 [ 13.980112][ T242] ? kernel_read_file+0x3f5/0x550 [ 13.980118][ T242] ? kernel_read_file+0x3d0/0x550 [ 13.980122][ T242] ? __pfx_kernel_read_file+0x10/0x10 [ 13.980125][ T242] ? add_chain_cache+0x110/0x370 [ 13.980131][ T242] ? init_module_from_file+0xe9/0x150 [ 13.980135][ T242] init_module_from_file+0xe9/0x150 [ 13.980138][ T242] ? __pfx_init_module_from_file+0x10/0x10 [ 13.980147][ T242] ? idempotent_init_module+0x31a/0x620 [ 13.980150][ T242] ? __lock_release+0x5d/0x170 [ 13.980156][ T242] ? do_raw_spin_unlock+0x58/0x220 [ 13.980159][ T242] idempotent_init_module+0x335/0x620 [ 13.980164][ T242] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.980172][ T242] ? cap_capable+0x94/0x230 [ 13.980178][ T242] __x64_sys_finit_module+0xca/0x150 [ 13.980181][ T242] ? do_syscall_64+0x85/0x380 [ 13.980185][ T242] do_syscall_64+0xc1/0x380 [ 13.980189][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.980192][ T242] RIP: 0033:0x7f4bf8915e5d [ 13.980196][ T242] 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 [ 13.980199][ T242] RSP: 002b:00007fff3b9a3e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.980203][ T242] RAX: ffffffffffffffda RBX: 000056551d330960 RCX: 00007f4bf8915e5d [ 13.980205][ T242] RDX: 0000000000000000 RSI: 00005655028afa2a RDI: 0000000000000005 [ 13.980207][ T242] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff3b9a3fa0 [ 13.980209][ T242] R10: 0000000000000005 R11: 0000000000000246 R12: 00005655028afa2a [ 13.980210][ T242] R13: 000056551d330b10 R14: 000056551d330db0 R15: 0000000000000000 [ 13.980217][ T242] [ 13.980218][ T242] [ 13.990747][ T242] Allocated by task 208: [ 13.990875][ T242] kasan_save_stack+0x24/0x50 [ 13.991054][ T242] kasan_save_track+0x14/0x30 [ 13.991227][ T242] __kasan_kmalloc+0x7f/0x90 [ 13.991400][ T242] __kmalloc_noprof+0x1d4/0x470 [ 13.991585][ T242] virtqueue_add_split+0x6a3/0x1920 [ 13.991759][ T242] virtqueue_add_sgs+0x143/0x270 [ 13.991930][ T242] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.992101][ T242] virtio_fs_send_req+0x13a/0x710 [ 13.992272][ T242] __fuse_simple_request+0x22a/0xb50 [ 13.992442][ T242] fuse_readlink_folio+0x20b/0x400 [ 13.992626][ T242] fuse_get_link+0x12d/0x350 [ 13.992801][ T242] pick_link+0x7a2/0x1160 [ 13.992931][ T242] step_into+0x85a/0xfc0 [ 13.993059][ T242] link_path_walk+0x3c2/0xa10 [ 13.993229][ T242] path_openat+0x14d/0x380 [ 13.993399][ T242] do_filp_open+0x1d7/0x420 [ 13.993570][ T242] do_sys_openat2+0xd4/0x160 [ 13.993750][ T242] __x64_sys_openat+0x122/0x1e0 [ 13.993920][ T242] do_syscall_64+0xc1/0x380 [ 13.994096][ T242] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.994307][ T242] [ 13.994392][ T242] Freed by task 62: [ 13.994517][ T242] kasan_save_stack+0x24/0x50 [ 13.994706][ T242] kasan_save_track+0x14/0x30 [ 13.994876][ T242] kasan_save_free_info+0x3b/0x60 [ 13.995054][ T242] __kasan_slab_free+0x38/0x50 [ 13.995223][ T242] kfree+0x144/0x320 [ 13.995352][ T242] detach_buf_split+0x48d/0x6f0 [ 13.995529][ T242] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.995767][ T242] virtio_fs_requests_done_work+0x231/0x890 [ 13.995979][ T242] process_one_work+0xe43/0x1660 [ 13.996152][ T242] worker_thread+0x591/0xcf0 [ 13.996326][ T242] kthread+0x37b/0x600 [ 13.996454][ T242] ret_from_fork+0x243/0x320 [ 13.996625][ T242] ret_from_fork_asm+0x1a/0x30 [ 13.996826][ T242] [ 13.996913][ T242] The buggy address belongs to the object at ffff88800192c720 [ 13.996913][ T242] which belongs to the cache kmalloc-96 of size 96 [ 13.997324][ T242] The buggy address is located 0 bytes inside of [ 13.997324][ T242] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.997749][ T242] [ 13.997835][ T242] The buggy address belongs to the physical page: [ 13.998048][ T242] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800192ca20 pfn:0x192c [ 13.998394][ T242] flags: 0x80000000000200(workingset|node=0|zone=1) [ 13.998613][ T242] page_type: f5(slab) [ 13.998769][ T242] raw: 0080000000000200 ffff888001042340 ffffea0000049010 ffffea0000042fd0 [ 13.999076][ T242] raw: ffff88800192ca20 000000000010000d 00000000f5000000 0000000000000000 [ 13.999389][ T242] page dumped because: kasan: bad access detected [ 13.999600][ T242] [ 13.999684][ T242] Memory state around the buggy address: [ 13.999861][ T242] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 14.000112][ T242] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.000363][ T242] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 14.000610][ T242] ^ [ 14.000786][ T242] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 14.001033][ T242] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 14.001278][ T242] ================================================================== [ 14.001575][ T242] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr