[ 13.927678][ T236] ================================================================== [ 13.928046][ T236] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.928298][ T236] Read of size 1 at addr ffff88800192c720 by task modprobe/236 [ 13.928547][ T236] [ 13.928638][ T236] CPU: 2 UID: 0 PID: 236 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.928643][ T236] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.928645][ T236] Call Trace: [ 13.928647][ T236] [ 13.928648][ T236] dump_stack_lvl+0x82/0xd0 [ 13.928656][ T236] print_address_description.constprop.0+0x2c/0x400 [ 13.928663][ T236] ? emit_its_trampoline+0xa5/0x300 [ 13.928666][ T236] print_report+0xb4/0x270 [ 13.928669][ T236] ? emit_its_trampoline+0xa5/0x300 [ 13.928671][ T236] ? kasan_addr_to_slab+0x25/0x80 [ 13.928674][ T236] ? emit_its_trampoline+0xa5/0x300 [ 13.928677][ T236] kasan_report+0xca/0x100 [ 13.928680][ T236] ? emit_its_trampoline+0xa5/0x300 [ 13.928685][ T236] ? emit_its_trampoline+0xa5/0x300 [ 13.928687][ T236] __kasan_check_byte+0x3a/0x50 [ 13.928691][ T236] krealloc_noprof+0x3d/0x320 [ 13.928694][ T236] ? execmem_alloc+0xc0/0x240 [ 13.928699][ T236] emit_its_trampoline+0xa5/0x300 [ 13.928702][ T236] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.928708][ T236] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.928712][ T236] apply_retpolines+0xcf/0x550 [ 13.928716][ T236] ? __pfx_apply_retpolines+0x10/0x10 [ 13.928719][ T236] ? __pfx___mutex_lock+0x10/0x10 [ 13.928729][ T236] module_finalize+0x3d5/0x9d0 [ 13.928736][ T236] ? add_kallsyms+0x7bf/0xf40 [ 13.928740][ T236] ? __pfx_module_finalize+0x10/0x10 [ 13.928744][ T236] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.928748][ T236] ? __pfx_swap_ex+0x10/0x10 [ 13.928752][ T236] load_module+0x139a/0x2660 [ 13.928760][ T236] ? __pfx_load_module+0x10/0x10 [ 13.928764][ T236] ? kernel_read_file+0x3f5/0x550 [ 13.928769][ T236] ? kernel_read_file+0x3d0/0x550 [ 13.928773][ T236] ? __pfx_kernel_read_file+0x10/0x10 [ 13.928776][ T236] ? add_chain_cache+0x110/0x370 [ 13.928782][ T236] ? init_module_from_file+0xe9/0x150 [ 13.928785][ T236] init_module_from_file+0xe9/0x150 [ 13.928789][ T236] ? __pfx_init_module_from_file+0x10/0x10 [ 13.928797][ T236] ? idempotent_init_module+0x31a/0x620 [ 13.928801][ T236] ? __lock_release+0x5d/0x170 [ 13.928806][ T236] ? do_raw_spin_unlock+0x58/0x220 [ 13.928810][ T236] idempotent_init_module+0x335/0x620 [ 13.928815][ T236] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.928823][ T236] ? cap_capable+0x94/0x230 [ 13.928829][ T236] __x64_sys_finit_module+0xca/0x150 [ 13.928833][ T236] ? do_syscall_64+0x85/0x380 [ 13.928837][ T236] do_syscall_64+0xc1/0x380 [ 13.928840][ T236] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.928843][ T236] RIP: 0033:0x7f3a26f7fe5d [ 13.928848][ T236] 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 [ 13.928851][ T236] RSP: 002b:00007ffd220c63d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.928854][ T236] RAX: ffffffffffffffda RBX: 000055cdee4a7960 RCX: 00007f3a26f7fe5d [ 13.928857][ T236] RDX: 0000000000000000 RSI: 000055cdc386da2a RDI: 0000000000000005 [ 13.928859][ T236] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffd220c6510 [ 13.928860][ T236] R10: 0000000000000005 R11: 0000000000000246 R12: 000055cdc386da2a [ 13.928862][ T236] R13: 000055cdee4a7b10 R14: 000055cdee4a7db0 R15: 0000000000000000 [ 13.928868][ T236] [ 13.928870][ T236] [ 13.939251][ T236] Allocated by task 208: [ 13.939382][ T236] kasan_save_stack+0x24/0x50 [ 13.939560][ T236] kasan_save_track+0x14/0x30 [ 13.939730][ T236] __kasan_kmalloc+0x7f/0x90 [ 13.939905][ T236] __kmalloc_noprof+0x1d4/0x470 [ 13.940077][ T236] virtqueue_add_split+0x6a3/0x1920 [ 13.940249][ T236] virtqueue_add_sgs+0x143/0x270 [ 13.940419][ T236] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.940589][ T236] virtio_fs_send_req+0x13a/0x710 [ 13.940760][ T236] __fuse_simple_request+0x22a/0xb50 [ 13.940931][ T236] fuse_file_put+0x170/0x1f0 [ 13.941107][ T236] fuse_release+0x134/0x1c0 [ 13.941277][ T236] __fput+0x35c/0xa80 [ 13.941406][ T236] task_work_run+0x134/0x220 [ 13.941578][ T236] do_exit+0x594/0xe90 [ 13.941707][ T236] do_group_exit+0xb8/0x260 [ 13.941876][ T236] __x64_sys_exit_group+0x3e/0x50 [ 13.942044][ T236] x64_sys_call+0xf76/0x18a0 [ 13.942213][ T236] do_syscall_64+0xc1/0x380 [ 13.942383][ T236] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.942599][ T236] [ 13.942683][ T236] Freed by task 68: [ 13.942809][ T236] kasan_save_stack+0x24/0x50 [ 13.942980][ T236] kasan_save_track+0x14/0x30 [ 13.943149][ T236] kasan_save_free_info+0x3b/0x60 [ 13.943318][ T236] __kasan_slab_free+0x38/0x50 [ 13.943486][ T236] kfree+0x144/0x320 [ 13.943613][ T236] detach_buf_split+0x48d/0x6f0 [ 13.943784][ T236] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.943995][ T236] virtio_fs_requests_done_work+0x231/0x890 [ 13.944206][ T236] process_one_work+0xe43/0x1660 [ 13.944375][ T236] worker_thread+0x591/0xcf0 [ 13.944544][ T236] kthread+0x37b/0x600 [ 13.944673][ T236] ret_from_fork+0x243/0x320 [ 13.944843][ T236] ret_from_fork_asm+0x1a/0x30 [ 13.945011][ T236] [ 13.945099][ T236] The buggy address belongs to the object at ffff88800192c720 [ 13.945099][ T236] which belongs to the cache kmalloc-96 of size 96 [ 13.945503][ T236] The buggy address is located 0 bytes inside of [ 13.945503][ T236] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.945915][ T236] [ 13.946001][ T236] The buggy address belongs to the physical page: [ 13.946208][ T236] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800192cb20 pfn:0x192c [ 13.946548][ T236] flags: 0x80000000000200(workingset|node=0|zone=1) [ 13.946770][ T236] page_type: f5(slab) [ 13.946910][ T236] raw: 0080000000000200 ffff888001042340 ffffea0000049010 ffffea0000042fd0 [ 13.947215][ T236] raw: ffff88800192cb20 000000000010000d 00000000f5000000 0000000000000000 [ 13.947518][ T236] page dumped because: kasan: bad access detected [ 13.947725][ T236] [ 13.947808][ T236] Memory state around the buggy address: [ 13.947981][ T236] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.948230][ T236] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.948480][ T236] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.948727][ T236] ^ [ 13.948892][ T236] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.949136][ T236] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.949380][ T236] ================================================================== [ 13.949681][ T236] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr