[ 16.581869][ T266] ================================================================== [ 16.582372][ T266] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.582777][ T266] Read of size 1 at addr ffff888001926720 by task modprobe/266 [ 16.583175][ T266] [ 16.583270][ T266] CPU: 3 UID: 0 PID: 266 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.583275][ T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.583278][ T266] Call Trace: [ 16.583280][ T266] [ 16.583282][ T266] dump_stack_lvl+0x82/0xd0 [ 16.583292][ T266] print_address_description.constprop.0+0x2c/0x400 [ 16.583298][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.583302][ T266] print_report+0xb4/0x270 [ 16.583305][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.583308][ T266] ? kasan_addr_to_slab+0x25/0x80 [ 16.583313][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.583316][ T266] kasan_report+0xca/0x100 [ 16.583319][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.583325][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.583328][ T266] __kasan_check_byte+0x3a/0x50 [ 16.583332][ T266] krealloc_noprof+0x3d/0x320 [ 16.583337][ T266] ? execmem_alloc+0xc0/0x240 [ 16.583342][ T266] emit_its_trampoline+0xa5/0x300 [ 16.583346][ T266] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.583353][ T266] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.583357][ T266] apply_retpolines+0xcf/0x550 [ 16.583362][ T266] ? __pfx_apply_retpolines+0x10/0x10 [ 16.583366][ T266] ? __pfx___mutex_lock+0x10/0x10 [ 16.583377][ T266] module_finalize+0x3d5/0x9d0 [ 16.583384][ T266] ? add_kallsyms+0x7bf/0xf40 [ 16.583391][ T266] ? __pfx_module_finalize+0x10/0x10 [ 16.583395][ T266] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.583398][ T266] ? __pfx_swap_ex+0x10/0x10 [ 16.583403][ T266] load_module+0x139a/0x2660 [ 16.583410][ T266] ? __pfx_load_module+0x10/0x10 [ 16.583413][ T266] ? kernel_read_file+0x3f5/0x550 [ 16.583421][ T266] ? kernel_read_file+0x3d0/0x550 [ 16.583426][ T266] ? __pfx_kernel_read_file+0x10/0x10 [ 16.583429][ T266] ? add_chain_cache+0x110/0x370 [ 16.583435][ T266] ? init_module_from_file+0xe9/0x150 [ 16.583438][ T266] init_module_from_file+0xe9/0x150 [ 16.583442][ T266] ? __pfx_init_module_from_file+0x10/0x10 [ 16.583450][ T266] ? idempotent_init_module+0x31a/0x620 [ 16.583453][ T266] ? __lock_release+0x5d/0x170 [ 16.583458][ T266] ? do_raw_spin_unlock+0x58/0x220 [ 16.583463][ T266] idempotent_init_module+0x335/0x620 [ 16.583467][ T266] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.583475][ T266] ? cap_capable+0x94/0x230 [ 16.583483][ T266] __x64_sys_finit_module+0xca/0x150 [ 16.583486][ T266] ? do_syscall_64+0x85/0x380 [ 16.583491][ T266] do_syscall_64+0xc1/0x380 [ 16.583495][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.583499][ T266] RIP: 0033:0x7f23a7bece5d [ 16.583504][ 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 [ 16.583506][ T266] RSP: 002b:00007ffc19c675e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.583511][ T266] RAX: ffffffffffffffda RBX: 000055594a4b9960 RCX: 00007f23a7bece5d [ 16.583513][ T266] RDX: 0000000000000000 RSI: 000055592f66ea2a RDI: 0000000000000005 [ 16.583515][ T266] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffc19c67720 [ 16.583517][ T266] R10: 0000000000000005 R11: 0000000000000246 R12: 000055592f66ea2a [ 16.583519][ T266] R13: 000055594a4b9b10 R14: 000055594a4b9db0 R15: 0000000000000000 [ 16.583525][ T266] [ 16.583527][ T266] [ 16.595040][ T266] Allocated by task 255: [ 16.595180][ T266] kasan_save_stack+0x24/0x50 [ 16.595374][ T266] kasan_save_track+0x14/0x30 [ 16.595560][ T266] __kasan_kmalloc+0x7f/0x90 [ 16.595748][ T266] __kmalloc_noprof+0x1d4/0x470 [ 16.595935][ T266] virtqueue_add_split+0x6a7/0x1900 [ 16.596129][ T266] virtqueue_add_sgs+0x143/0x270 [ 16.596316][ T266] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.596508][ T266] virtio_fs_send_req+0x13a/0x710 [ 16.596697][ T266] __fuse_simple_request+0x22a/0xb50 [ 16.596892][ T266] fuse_readlink_folio+0x20b/0x400 [ 16.597085][ T266] fuse_get_link+0x12d/0x350 [ 16.597292][ T266] pick_link+0x7a2/0x1160 [ 16.597437][ T266] step_into+0x85a/0xfc0 [ 16.597580][ T266] link_path_walk+0x3c2/0xa10 [ 16.597769][ T266] path_openat+0x14d/0x380 [ 16.597959][ T266] do_filp_open+0x1d7/0x420 [ 16.598151][ T266] do_sys_openat2+0xd4/0x160 [ 16.598342][ T266] __x64_sys_openat+0x122/0x1e0 [ 16.598541][ T266] do_syscall_64+0xc1/0x380 [ 16.598728][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.598963][ T266] [ 16.599061][ T266] Freed by task 70: [ 16.599204][ T266] kasan_save_stack+0x24/0x50 [ 16.599395][ T266] kasan_save_track+0x14/0x30 [ 16.599584][ T266] kasan_save_free_info+0x3b/0x60 [ 16.599774][ T266] __kasan_slab_free+0x38/0x50 [ 16.599964][ T266] kfree+0x144/0x320 [ 16.600106][ T266] detach_buf_split+0x48d/0x6f0 [ 16.600296][ T266] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.600533][ T266] virtio_fs_requests_done_work+0x231/0x890 [ 16.600772][ T266] process_one_work+0xe43/0x1660 [ 16.600963][ T266] worker_thread+0x591/0xcf0 [ 16.601154][ T266] kthread+0x37b/0x600 [ 16.601298][ T266] ret_from_fork+0x243/0x320 [ 16.601487][ T266] ret_from_fork_asm+0x1a/0x30 [ 16.601679][ T266] [ 16.601773][ T266] The buggy address belongs to the object at ffff888001926720 [ 16.601773][ T266] which belongs to the cache kmalloc-96 of size 96 [ 16.602230][ T266] The buggy address is located 0 bytes inside of [ 16.602230][ T266] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.602686][ T266] [ 16.602782][ T266] The buggy address belongs to the physical page: [ 16.603011][ T266] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 16.603351][ T266] flags: 0x80000000000000(node=0|zone=1) [ 16.603544][ T266] page_type: f5(slab) [ 16.603692][ T266] raw: 0080000000000000 ffff888001042340 ffffea000007da90 ffffea0000305750 [ 16.604030][ T266] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 16.604365][ T266] page dumped because: kasan: bad access detected [ 16.604599][ T266] [ 16.604697][ T266] Memory state around the buggy address: [ 16.604884][ T266] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.605161][ T266] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.605437][ T266] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.605710][ T266] ^ [ 16.605893][ T266] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.606168][ T266] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.606444][ T266] ================================================================== [ 16.606742][ T266] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr