[ 22.260305][ T339] ================================================================== [ 22.260679][ T339] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 22.260947][ T339] Read of size 1 at addr ffff888001926720 by task modprobe/339 [ 22.261205][ T339] [ 22.261299][ T339] CPU: 1 UID: 0 PID: 339 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 22.261304][ T339] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 22.261306][ T339] Call Trace: [ 22.261308][ T339] [ 22.261310][ T339] dump_stack_lvl+0x82/0xd0 [ 22.261318][ T339] print_address_description.constprop.0+0x2c/0x400 [ 22.261323][ T339] ? emit_its_trampoline+0xa5/0x300 [ 22.261327][ T339] print_report+0xb4/0x270 [ 22.261330][ T339] ? emit_its_trampoline+0xa5/0x300 [ 22.261333][ T339] ? kasan_addr_to_slab+0x25/0x80 [ 22.261338][ T339] ? emit_its_trampoline+0xa5/0x300 [ 22.261341][ T339] kasan_report+0xca/0x100 [ 22.261344][ T339] ? emit_its_trampoline+0xa5/0x300 [ 22.261350][ T339] ? emit_its_trampoline+0xa5/0x300 [ 22.261353][ T339] __kasan_check_byte+0x3a/0x50 [ 22.261356][ T339] krealloc_noprof+0x3d/0x320 [ 22.261361][ T339] ? execmem_alloc+0xc0/0x240 [ 22.261365][ T339] emit_its_trampoline+0xa5/0x300 [ 22.261369][ T339] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 22.261376][ T339] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 22.261379][ T339] apply_retpolines+0xcf/0x550 [ 22.261384][ T339] ? __pfx_apply_retpolines+0x10/0x10 [ 22.261388][ T339] ? __pfx___mutex_lock+0x10/0x10 [ 22.261397][ T339] module_finalize+0x3d5/0x9d0 [ 22.261403][ T339] ? add_kallsyms+0x7bf/0xf40 [ 22.261410][ T339] ? __pfx_module_finalize+0x10/0x10 [ 22.261414][ T339] ? __pfx_cmp_ex_sort+0x10/0x10 [ 22.261417][ T339] ? __pfx_swap_ex+0x10/0x10 [ 22.261422][ T339] load_module+0x139a/0x2660 [ 22.261429][ T339] ? __pfx_load_module+0x10/0x10 [ 22.261432][ T339] ? kernel_read_file+0x3f5/0x550 [ 22.261440][ T339] ? kernel_read_file+0x3d0/0x550 [ 22.261444][ T339] ? __pfx_kernel_read_file+0x10/0x10 [ 22.261448][ T339] ? add_chain_cache+0x110/0x370 [ 22.261453][ T339] ? init_module_from_file+0xe9/0x150 [ 22.261456][ T339] init_module_from_file+0xe9/0x150 [ 22.261460][ T339] ? __pfx_init_module_from_file+0x10/0x10 [ 22.261468][ T339] ? idempotent_init_module+0x31a/0x620 [ 22.261471][ T339] ? __lock_release+0x5d/0x170 [ 22.261476][ T339] ? do_raw_spin_unlock+0x58/0x220 [ 22.261480][ T339] idempotent_init_module+0x335/0x620 [ 22.261485][ T339] ? __pfx_idempotent_init_module+0x10/0x10 [ 22.261492][ T339] ? cap_capable+0x94/0x230 [ 22.261499][ T339] __x64_sys_finit_module+0xca/0x150 [ 22.261502][ T339] ? do_syscall_64+0x85/0x380 [ 22.261506][ T339] do_syscall_64+0xc1/0x380 [ 22.261510][ T339] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 22.261513][ T339] RIP: 0033:0x7f6a6ce3ee5d [ 22.261518][ T339] 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 [ 22.261521][ T339] RSP: 002b:00007ffdcf5abe58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 22.261526][ T339] RAX: ffffffffffffffda RBX: 000055de4665b960 RCX: 00007f6a6ce3ee5d [ 22.261528][ T339] RDX: 0000000000000000 RSI: 000055de24a40a2a RDI: 0000000000000005 [ 22.261530][ T339] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffdcf5abf90 [ 22.261532][ T339] R10: 0000000000000005 R11: 0000000000000246 R12: 000055de24a40a2a [ 22.261534][ T339] R13: 000055de4665bb10 R14: 000055de4665bdb0 R15: 0000000000000000 [ 22.261540][ T339] [ 22.261542][ T339] [ 22.272245][ T339] Allocated by task 326: [ 22.272378][ T339] kasan_save_stack+0x24/0x50 [ 22.272562][ T339] kasan_save_track+0x14/0x30 [ 22.272740][ T339] __kasan_kmalloc+0x7f/0x90 [ 22.272916][ T339] __kmalloc_noprof+0x1d4/0x470 [ 22.273097][ T339] virtqueue_add_split+0x6a3/0x1920 [ 22.273278][ T339] virtqueue_add_sgs+0x143/0x270 [ 22.273456][ T339] virtio_fs_enqueue_req+0x58c/0xfe0 [ 22.273633][ T339] virtio_fs_send_req+0x13a/0x710 [ 22.273810][ T339] __fuse_simple_request+0x22a/0xb50 [ 22.273986][ T339] fuse_file_put+0x170/0x1f0 [ 22.274164][ T339] fuse_release+0x134/0x1c0 [ 22.274340][ T339] __fput+0x35c/0xa80 [ 22.274477][ T339] task_work_run+0x134/0x220 [ 22.274655][ T339] exit_to_user_mode_loop+0xd1/0xe0 [ 22.274832][ T339] do_syscall_64+0x2fe/0x380 [ 22.275008][ T339] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 22.275231][ T339] [ 22.275327][ T339] Freed by task 66: [ 22.275459][ T339] kasan_save_stack+0x24/0x50 [ 22.275637][ T339] kasan_save_track+0x14/0x30 [ 22.275823][ T339] kasan_save_free_info+0x3b/0x60 [ 22.276003][ T339] __kasan_slab_free+0x38/0x50 [ 22.276179][ T339] kfree+0x144/0x320 [ 22.276312][ T339] detach_buf_split+0x48d/0x6f0 [ 22.276489][ T339] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 22.276711][ T339] virtio_fs_requests_done_work+0x231/0x890 [ 22.276933][ T339] process_one_work+0xe43/0x1660 [ 22.277110][ T339] worker_thread+0x591/0xcf0 [ 22.277287][ T339] kthread+0x37b/0x600 [ 22.277422][ T339] ret_from_fork+0x243/0x320 [ 22.277600][ T339] ret_from_fork_asm+0x1a/0x30 [ 22.277778][ T339] [ 22.277867][ T339] The buggy address belongs to the object at ffff888001926720 [ 22.277867][ T339] which belongs to the cache kmalloc-96 of size 96 [ 22.278295][ T339] The buggy address is located 0 bytes inside of [ 22.278295][ T339] freed 96-byte region [ffff888001926720, ffff888001926780) [ 22.278732][ T339] [ 22.278822][ T339] The buggy address belongs to the physical page: [ 22.279038][ T339] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 22.279354][ T339] flags: 0x80000000000000(node=0|zone=1) [ 22.279536][ T339] page_type: f5(slab) [ 22.279677][ T339] raw: 0080000000000000 ffff888001042340 ffffea00002a89d0 ffffea00002705d0 [ 22.280004][ T339] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 22.280317][ T339] page dumped because: kasan: bad access detected [ 22.280535][ T339] [ 22.280622][ T339] Memory state around the buggy address: [ 22.280794][ T339] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 22.281054][ T339] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.281314][ T339] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 22.281571][ T339] ^ [ 22.281741][ T339] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.281996][ T339] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 22.282259][ T339] ================================================================== [ 22.282544][ T339] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr