[ 12.903121][ T241] ================================================================== [ 12.903482][ T241] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.903737][ T241] Read of size 1 at addr ffff88800192c720 by task modprobe/241 [ 12.903983][ T241] [ 12.904074][ T241] CPU: 3 UID: 0 PID: 241 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.904079][ T241] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.904081][ T241] Call Trace: [ 12.904083][ T241] [ 12.904085][ T241] dump_stack_lvl+0x82/0xd0 [ 12.904093][ T241] print_address_description.constprop.0+0x2c/0x400 [ 12.904099][ T241] ? emit_its_trampoline+0xa5/0x300 [ 12.904102][ T241] print_report+0xb4/0x270 [ 12.904105][ T241] ? emit_its_trampoline+0xa5/0x300 [ 12.904107][ T241] ? kasan_addr_to_slab+0x25/0x80 [ 12.904111][ T241] ? emit_its_trampoline+0xa5/0x300 [ 12.904113][ T241] kasan_report+0xca/0x100 [ 12.904117][ T241] ? emit_its_trampoline+0xa5/0x300 [ 12.904121][ T241] ? emit_its_trampoline+0xa5/0x300 [ 12.904123][ T241] __kasan_check_byte+0x3a/0x50 [ 12.904127][ T241] krealloc_noprof+0x3d/0x320 [ 12.904130][ T241] ? execmem_alloc+0xc0/0x240 [ 12.904136][ T241] emit_its_trampoline+0xa5/0x300 [ 12.904138][ T241] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.904145][ T241] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.904148][ T241] apply_retpolines+0xcf/0x550 [ 12.904152][ T241] ? __pfx_apply_retpolines+0x10/0x10 [ 12.904155][ T241] ? __pfx___mutex_lock+0x10/0x10 [ 12.904165][ T241] module_finalize+0x3d5/0x9d0 [ 12.904172][ T241] ? add_kallsyms+0x7bf/0xf40 [ 12.904176][ T241] ? __pfx_module_finalize+0x10/0x10 [ 12.904181][ T241] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.904184][ T241] ? __pfx_swap_ex+0x10/0x10 [ 12.904188][ T241] load_module+0x139a/0x2660 [ 12.904197][ T241] ? __pfx_load_module+0x10/0x10 [ 12.904200][ T241] ? kernel_read_file+0x3f5/0x550 [ 12.904205][ T241] ? kernel_read_file+0x3d0/0x550 [ 12.904209][ T241] ? __pfx_kernel_read_file+0x10/0x10 [ 12.904212][ T241] ? add_chain_cache+0x110/0x370 [ 12.904218][ T241] ? init_module_from_file+0xe9/0x150 [ 12.904221][ T241] init_module_from_file+0xe9/0x150 [ 12.904225][ T241] ? __pfx_init_module_from_file+0x10/0x10 [ 12.904234][ T241] ? idempotent_init_module+0x31a/0x620 [ 12.904237][ T241] ? __lock_release+0x5d/0x170 [ 12.904242][ T241] ? do_raw_spin_unlock+0x58/0x220 [ 12.904246][ T241] idempotent_init_module+0x335/0x620 [ 12.904251][ T241] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.904259][ T241] ? cap_capable+0x94/0x230 [ 12.904266][ T241] __x64_sys_finit_module+0xca/0x150 [ 12.904270][ T241] ? do_syscall_64+0x85/0x380 [ 12.904274][ T241] do_syscall_64+0xc1/0x380 [ 12.904277][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.904281][ T241] RIP: 0033:0x7f1dbefc2e5d [ 12.904285][ T241] 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 [ 12.904287][ T241] RSP: 002b:00007ffc356c0c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.904291][ T241] RAX: ffffffffffffffda RBX: 0000563cb681b960 RCX: 00007f1dbefc2e5d [ 12.904294][ T241] RDX: 0000000000000000 RSI: 0000563cb0963a2a RDI: 0000000000000005 [ 12.904295][ T241] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffc356c0d80 [ 12.904297][ T241] R10: 0000000000000005 R11: 0000000000000246 R12: 0000563cb0963a2a [ 12.904299][ T241] R13: 0000563cb681bb10 R14: 0000563cb681bdb0 R15: 0000000000000000 [ 12.904305][ T241] [ 12.904306][ T241] [ 12.914578][ T241] Allocated by task 227: [ 12.914706][ T241] kasan_save_stack+0x24/0x50 [ 12.914893][ T241] kasan_save_track+0x14/0x30 [ 12.915058][ T241] __kasan_kmalloc+0x7f/0x90 [ 12.915224][ T241] __kmalloc_noprof+0x1d4/0x470 [ 12.915391][ T241] virtqueue_add_split+0x6a3/0x1920 [ 12.915565][ T241] virtqueue_add_sgs+0x143/0x270 [ 12.915732][ T241] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.915900][ T241] virtio_fs_send_req+0x13a/0x710 [ 12.916066][ T241] __fuse_simple_request+0x22a/0xb50 [ 12.916234][ T241] fuse_readlink_folio+0x20b/0x400 [ 12.916400][ T241] fuse_get_link+0x12d/0x350 [ 12.916568][ T241] pick_link+0x7a2/0x1160 [ 12.916695][ T241] step_into+0x85a/0xfc0 [ 12.916822][ T241] link_path_walk+0x3c2/0xa10 [ 12.916989][ T241] path_openat+0x14d/0x380 [ 12.917161][ T241] do_filp_open+0x1d7/0x420 [ 12.917328][ T241] do_sys_openat2+0xd4/0x160 [ 12.917492][ T241] __x64_sys_openat+0x122/0x1e0 [ 12.917657][ T241] do_syscall_64+0xc1/0x380 [ 12.917823][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.918030][ T241] [ 12.918113][ T241] Freed by task 51: [ 12.918236][ T241] kasan_save_stack+0x24/0x50 [ 12.918405][ T241] kasan_save_track+0x14/0x30 [ 12.918571][ T241] kasan_save_free_info+0x3b/0x60 [ 12.918738][ T241] __kasan_slab_free+0x38/0x50 [ 12.918905][ T241] kfree+0x144/0x320 [ 12.919030][ T241] detach_buf_split+0x48d/0x6f0 [ 12.919195][ T241] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.919402][ T241] virtio_fs_requests_done_work+0x231/0x890 [ 12.919606][ T241] process_one_work+0xe43/0x1660 [ 12.919775][ T241] worker_thread+0x591/0xcf0 [ 12.919942][ T241] kthread+0x37b/0x600 [ 12.920069][ T241] ret_from_fork+0x243/0x320 [ 12.920235][ T241] ret_from_fork_asm+0x1a/0x30 [ 12.920401][ T241] [ 12.920485][ T241] The buggy address belongs to the object at ffff88800192c720 [ 12.920485][ T241] which belongs to the cache kmalloc-96 of size 96 [ 12.920885][ T241] The buggy address is located 0 bytes inside of [ 12.920885][ T241] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.921283][ T241] [ 12.921373][ T241] The buggy address belongs to the physical page: [ 12.921573][ T241] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 12.921866][ T241] flags: 0x80000000000000(node=0|zone=1) [ 12.922040][ T241] page_type: f5(slab) [ 12.922191][ T241] raw: 0080000000000000 ffff888001042340 ffffea0000133190 ffffea00001324d0 [ 12.922498][ T241] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 12.922800][ T241] page dumped because: kasan: bad access detected [ 12.923010][ T241] [ 12.923094][ T241] Memory state around the buggy address: [ 12.923263][ T241] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.923517][ T241] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.923779][ T241] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.924022][ T241] ^ [ 12.924202][ T241] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.924462][ T241] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.924703][ T241] ================================================================== [ 12.925082][ T241] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr