[ 13.286338][ T247] ================================================================== [ 13.286639][ T247] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.286908][ T247] Read of size 1 at addr ffff88800192c720 by task modprobe/247 [ 13.287171][ T247] [ 13.287261][ T247] CPU: 0 UID: 0 PID: 247 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.287266][ T247] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.287268][ T247] Call Trace: [ 13.287270][ T247] [ 13.287272][ T247] dump_stack_lvl+0x82/0xd0 [ 13.287279][ T247] print_address_description.constprop.0+0x2c/0x400 [ 13.287286][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.287289][ T247] print_report+0xb4/0x270 [ 13.287292][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.287295][ T247] ? kasan_addr_to_slab+0x25/0x80 [ 13.287298][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.287300][ T247] kasan_report+0xca/0x100 [ 13.287304][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.287308][ T247] ? emit_its_trampoline+0xa5/0x300 [ 13.287311][ T247] __kasan_check_byte+0x3a/0x50 [ 13.287314][ T247] krealloc_noprof+0x3d/0x320 [ 13.287318][ T247] ? execmem_alloc+0xc0/0x240 [ 13.287323][ T247] emit_its_trampoline+0xa5/0x300 [ 13.287325][ T247] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.287331][ T247] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.287335][ T247] apply_retpolines+0xcf/0x550 [ 13.287339][ T247] ? __pfx_apply_retpolines+0x10/0x10 [ 13.287343][ T247] ? __pfx___mutex_lock+0x10/0x10 [ 13.287353][ T247] module_finalize+0x3d5/0x9d0 [ 13.287360][ T247] ? add_kallsyms+0x7bf/0xf40 [ 13.287364][ T247] ? __pfx_module_finalize+0x10/0x10 [ 13.287369][ T247] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.287372][ T247] ? __pfx_swap_ex+0x10/0x10 [ 13.287376][ T247] load_module+0x139a/0x2660 [ 13.287384][ T247] ? __pfx_load_module+0x10/0x10 [ 13.287388][ T247] ? kernel_read_file+0x3f5/0x550 [ 13.287393][ T247] ? kernel_read_file+0x3d0/0x550 [ 13.287397][ T247] ? __pfx_kernel_read_file+0x10/0x10 [ 13.287400][ T247] ? add_chain_cache+0x110/0x370 [ 13.287406][ T247] ? init_module_from_file+0xe9/0x150 [ 13.287409][ T247] init_module_from_file+0xe9/0x150 [ 13.287413][ T247] ? __pfx_init_module_from_file+0x10/0x10 [ 13.287422][ T247] ? idempotent_init_module+0x31a/0x620 [ 13.287425][ T247] ? __lock_release+0x5d/0x170 [ 13.287430][ T247] ? do_raw_spin_unlock+0x58/0x220 [ 13.287434][ T247] idempotent_init_module+0x335/0x620 [ 13.287439][ T247] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.287447][ T247] ? cap_capable+0x94/0x230 [ 13.287454][ T247] __x64_sys_finit_module+0xca/0x150 [ 13.287457][ T247] ? do_syscall_64+0x85/0x380 [ 13.287461][ T247] do_syscall_64+0xc1/0x380 [ 13.287464][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.287468][ T247] RIP: 0033:0x7faf48a95e5d [ 13.287472][ T247] 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 [ 13.287475][ T247] RSP: 002b:00007ffe177185c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.287479][ T247] RAX: ffffffffffffffda RBX: 000056448be37960 RCX: 00007faf48a95e5d [ 13.287481][ T247] RDX: 0000000000000000 RSI: 0000564485099a2a RDI: 0000000000000005 [ 13.287483][ T247] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe17718700 [ 13.287484][ T247] R10: 0000000000000005 R11: 0000000000000246 R12: 0000564485099a2a [ 13.287486][ T247] R13: 000056448be37b10 R14: 000056448be37db0 R15: 0000000000000000 [ 13.287492][ T247] [ 13.287494][ T247] [ 13.298556][ T247] Allocated by task 243: [ 13.298690][ T247] kasan_save_stack+0x24/0x50 [ 13.298874][ T247] kasan_save_track+0x14/0x30 [ 13.299055][ T247] __kasan_kmalloc+0x7f/0x90 [ 13.299233][ T247] __kmalloc_noprof+0x1d4/0x470 [ 13.299415][ T247] virtqueue_add_split+0x6a3/0x1920 [ 13.299597][ T247] virtqueue_add_sgs+0x143/0x270 [ 13.299778][ T247] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.299959][ T247] virtio_fs_send_req+0x13a/0x710 [ 13.300138][ T247] __fuse_simple_request+0x22a/0xb50 [ 13.300319][ T247] fuse_flush+0x41a/0x620 [ 13.300456][ T247] ovl_flush+0x110/0x170 [ 13.300596][ T247] filp_flush+0xe9/0x170 [ 13.300752][ T247] __x64_sys_close+0x72/0xd0 [ 13.300940][ T247] do_syscall_64+0xc1/0x380 [ 13.301120][ T247] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.301346][ T247] [ 13.301437][ T247] Freed by task 69: [ 13.301572][ T247] kasan_save_stack+0x24/0x50 [ 13.301756][ T247] kasan_save_track+0x14/0x30 [ 13.301948][ T247] kasan_save_free_info+0x3b/0x60 [ 13.302141][ T247] __kasan_slab_free+0x38/0x50 [ 13.302330][ T247] kfree+0x144/0x320 [ 13.302466][ T247] detach_buf_split+0x48d/0x6f0 [ 13.302648][ T247] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.302878][ T247] virtio_fs_requests_done_work+0x231/0x890 [ 13.303109][ T247] process_one_work+0xe43/0x1660 [ 13.303302][ T247] worker_thread+0x591/0xcf0 [ 13.303484][ T247] kthread+0x37b/0x600 [ 13.303621][ T247] ret_from_fork+0x243/0x320 [ 13.303803][ T247] ret_from_fork_asm+0x1a/0x30 [ 13.303986][ T247] [ 13.304075][ T247] The buggy address belongs to the object at ffff88800192c720 [ 13.304075][ T247] which belongs to the cache kmalloc-96 of size 96 [ 13.304512][ T247] The buggy address is located 0 bytes inside of [ 13.304512][ T247] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.304949][ T247] [ 13.305039][ T247] The buggy address belongs to the physical page: [ 13.305257][ T247] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.305576][ T247] flags: 0x80000000000000(node=0|zone=1) [ 13.305762][ T247] page_type: f5(slab) [ 13.305902][ T247] raw: 0080000000000000 ffff888001042340 ffffea00000a7050 ffffea00000a3bd0 [ 13.306224][ T247] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.306545][ T247] page dumped because: kasan: bad access detected [ 13.306784][ T247] [ 13.306877][ T247] Memory state around the buggy address: [ 13.307052][ T247] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.307317][ T247] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.307582][ T247] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.307847][ T247] ^ [ 13.308027][ T247] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.308291][ T247] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.308559][ T247] ================================================================== [ 13.308917][ T247] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr