[ 18.236492][ T267] ================================================================== [ 18.236807][ T267] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 18.237075][ T267] Read of size 1 at addr ffff888001926720 by task modprobe/267 [ 18.237336][ T267] [ 18.237427][ T267] CPU: 2 UID: 0 PID: 267 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 18.237433][ T267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.237435][ T267] Call Trace: [ 18.237437][ T267] [ 18.237439][ T267] dump_stack_lvl+0x82/0xd0 [ 18.237450][ T267] print_address_description.constprop.0+0x2c/0x400 [ 18.237455][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.237459][ T267] print_report+0xb4/0x270 [ 18.237462][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.237465][ T267] ? kasan_addr_to_slab+0x25/0x80 [ 18.237470][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.237473][ T267] kasan_report+0xca/0x100 [ 18.237477][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.237483][ T267] ? emit_its_trampoline+0xa5/0x300 [ 18.237486][ T267] __kasan_check_byte+0x3a/0x50 [ 18.237490][ T267] krealloc_noprof+0x3d/0x320 [ 18.237494][ T267] ? execmem_alloc+0xc0/0x240 [ 18.237502][ T267] emit_its_trampoline+0xa5/0x300 [ 18.237505][ T267] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 18.237511][ T267] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 18.237515][ T267] apply_retpolines+0xcf/0x550 [ 18.237520][ T267] ? __pfx_apply_retpolines+0x10/0x10 [ 18.237524][ T267] ? __pfx___mutex_lock+0x10/0x10 [ 18.237535][ T267] module_finalize+0x3d5/0x9d0 [ 18.237541][ T267] ? add_kallsyms+0x7bf/0xf40 [ 18.237547][ T267] ? __pfx_module_finalize+0x10/0x10 [ 18.237551][ T267] ? __pfx_cmp_ex_sort+0x10/0x10 [ 18.237554][ T267] ? __pfx_swap_ex+0x10/0x10 [ 18.237559][ T267] load_module+0x139a/0x2660 [ 18.237567][ T267] ? __pfx_load_module+0x10/0x10 [ 18.237570][ T267] ? kernel_read_file+0x3f5/0x550 [ 18.237576][ T267] ? kernel_read_file+0x3d0/0x550 [ 18.237581][ T267] ? __pfx_kernel_read_file+0x10/0x10 [ 18.237584][ T267] ? add_chain_cache+0x110/0x370 [ 18.237590][ T267] ? init_module_from_file+0xe9/0x150 [ 18.237593][ T267] init_module_from_file+0xe9/0x150 [ 18.237596][ T267] ? __pfx_init_module_from_file+0x10/0x10 [ 18.237605][ T267] ? idempotent_init_module+0x31a/0x620 [ 18.237608][ T267] ? __lock_release+0x5d/0x170 [ 18.237612][ T267] ? do_raw_spin_unlock+0x58/0x220 [ 18.237617][ T267] idempotent_init_module+0x335/0x620 [ 18.237621][ T267] ? __pfx_idempotent_init_module+0x10/0x10 [ 18.237629][ T267] ? cap_capable+0x94/0x230 [ 18.237636][ T267] __x64_sys_finit_module+0xca/0x150 [ 18.237639][ T267] ? do_syscall_64+0x85/0x380 [ 18.237644][ T267] do_syscall_64+0xc1/0x380 [ 18.237648][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.237651][ T267] RIP: 0033:0x7fa82d0c2e5d [ 18.237658][ T267] 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 [ 18.237661][ T267] RSP: 002b:00007ffd312ef798 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 18.237665][ T267] RAX: ffffffffffffffda RBX: 00005557932e5960 RCX: 00007fa82d0c2e5d [ 18.237667][ T267] RDX: 0000000000000000 RSI: 0000555770923a2a RDI: 0000000000000005 [ 18.237669][ T267] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffd312ef8d0 [ 18.237671][ T267] R10: 0000000000000005 R11: 0000000000000246 R12: 0000555770923a2a [ 18.237673][ T267] R13: 00005557932e5b10 R14: 00005557932e5db0 R15: 0000000000000000 [ 18.237679][ T267] [ 18.237681][ T267] [ 18.248716][ T267] Allocated by task 242: [ 18.248853][ T267] kasan_save_stack+0x24/0x50 [ 18.249066][ T267] kasan_save_track+0x14/0x30 [ 18.249246][ T267] __kasan_kmalloc+0x7f/0x90 [ 18.249424][ T267] __kmalloc_noprof+0x1d4/0x470 [ 18.249628][ T267] virtqueue_add_split+0x6a7/0x1900 [ 18.249815][ T267] virtqueue_add_sgs+0x143/0x270 [ 18.249992][ T267] virtio_fs_enqueue_req+0x58c/0xfe0 [ 18.250199][ T267] virtio_fs_send_req+0x13a/0x710 [ 18.250377][ T267] __fuse_simple_request+0x22a/0xb50 [ 18.250556][ T267] fuse_readlink_folio+0x20b/0x400 [ 18.250734][ T267] fuse_get_link+0x12d/0x350 [ 18.250919][ T267] pick_link+0x7a2/0x1160 [ 18.251054][ T267] step_into+0x85a/0xfc0 [ 18.251202][ T267] link_path_walk+0x3c2/0xa10 [ 18.251397][ T267] path_openat+0x14d/0x380 [ 18.251573][ T267] do_filp_open+0x1d7/0x420 [ 18.251749][ T267] do_sys_openat2+0xd4/0x160 [ 18.251929][ T267] __x64_sys_openat+0x122/0x1e0 [ 18.252107][ T267] do_syscall_64+0xc1/0x380 [ 18.252292][ T267] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.252524][ T267] [ 18.252615][ T267] Freed by task 61: [ 18.252751][ T267] kasan_save_stack+0x24/0x50 [ 18.252938][ T267] kasan_save_track+0x14/0x30 [ 18.253114][ T267] kasan_save_free_info+0x3b/0x60 [ 18.253298][ T267] __kasan_slab_free+0x38/0x50 [ 18.253475][ T267] kfree+0x144/0x320 [ 18.253610][ T267] detach_buf_split+0x48d/0x6f0 [ 18.253787][ T267] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 18.254008][ T267] virtio_fs_requests_done_work+0x231/0x890 [ 18.254227][ T267] process_one_work+0xe43/0x1660 [ 18.254403][ T267] worker_thread+0x591/0xcf0 [ 18.254579][ T267] kthread+0x37b/0x600 [ 18.254717][ T267] ret_from_fork+0x243/0x320 [ 18.254911][ T267] ret_from_fork_asm+0x1a/0x30 [ 18.255090][ T267] [ 18.255179][ T267] The buggy address belongs to the object at ffff888001926720 [ 18.255179][ T267] which belongs to the cache kmalloc-96 of size 96 [ 18.255620][ T267] The buggy address is located 0 bytes inside of [ 18.255620][ T267] freed 96-byte region [ffff888001926720, ffff888001926780) [ 18.256050][ T267] [ 18.256139][ T267] The buggy address belongs to the physical page: [ 18.256353][ T267] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888001926720 pfn:0x1926 [ 18.256711][ T267] flags: 0x80000000000200(workingset|node=0|zone=1) [ 18.256939][ T267] page_type: f5(slab) [ 18.257084][ T267] raw: 0080000000000200 ffff888001042340 ffffea00001301d0 ffffea0000095210 [ 18.257404][ T267] raw: ffff888001926720 000000000010000e 00000000f5000000 0000000000000000 [ 18.257717][ T267] page dumped because: kasan: bad access detected [ 18.257935][ T267] [ 18.258023][ T267] Memory state around the buggy address: [ 18.258193][ T267] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 18.258456][ T267] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.258711][ T267] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 18.258967][ T267] ^ [ 18.259137][ T267] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.259396][ T267] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 18.259650][ T267] ================================================================== [ 18.260038][ T267] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr