[ 12.972347][ T235] ================================================================== [ 12.972664][ T235] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.972945][ T235] Read of size 1 at addr ffff88800192c720 by task modprobe/235 [ 12.973224][ T235] [ 12.973322][ T235] CPU: 0 UID: 0 PID: 235 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.973327][ T235] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.973329][ T235] Call Trace: [ 12.973331][ T235] [ 12.973333][ T235] dump_stack_lvl+0x82/0xd0 [ 12.973341][ T235] print_address_description.constprop.0+0x2c/0x400 [ 12.973347][ T235] ? emit_its_trampoline+0xa5/0x300 [ 12.973350][ T235] print_report+0xb4/0x270 [ 12.973354][ T235] ? emit_its_trampoline+0xa5/0x300 [ 12.973356][ T235] ? kasan_addr_to_slab+0x25/0x80 [ 12.973359][ T235] ? emit_its_trampoline+0xa5/0x300 [ 12.973361][ T235] kasan_report+0xca/0x100 [ 12.973365][ T235] ? emit_its_trampoline+0xa5/0x300 [ 12.973370][ T235] ? emit_its_trampoline+0xa5/0x300 [ 12.973372][ T235] __kasan_check_byte+0x3a/0x50 [ 12.973375][ T235] krealloc_noprof+0x3d/0x320 [ 12.973379][ T235] ? execmem_alloc+0xc0/0x240 [ 12.973384][ T235] emit_its_trampoline+0xa5/0x300 [ 12.973387][ T235] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.973394][ T235] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.973397][ T235] apply_retpolines+0xcf/0x550 [ 12.973401][ T235] ? __pfx_apply_retpolines+0x10/0x10 [ 12.973404][ T235] ? __pfx___mutex_lock+0x10/0x10 [ 12.973414][ T235] module_finalize+0x3d5/0x9d0 [ 12.973421][ T235] ? add_kallsyms+0x7bf/0xf40 [ 12.973426][ T235] ? __pfx_module_finalize+0x10/0x10 [ 12.973430][ T235] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.973433][ T235] ? __pfx_swap_ex+0x10/0x10 [ 12.973438][ T235] load_module+0x139a/0x2660 [ 12.973446][ T235] ? __pfx_load_module+0x10/0x10 [ 12.973449][ T235] ? kernel_read_file+0x3f5/0x550 [ 12.973455][ T235] ? kernel_read_file+0x3d0/0x550 [ 12.973458][ T235] ? __pfx_kernel_read_file+0x10/0x10 [ 12.973461][ T235] ? add_chain_cache+0x110/0x370 [ 12.973467][ T235] ? init_module_from_file+0xe9/0x150 [ 12.973471][ T235] init_module_from_file+0xe9/0x150 [ 12.973475][ T235] ? __pfx_init_module_from_file+0x10/0x10 [ 12.973483][ T235] ? idempotent_init_module+0x31a/0x620 [ 12.973487][ T235] ? __lock_release+0x5d/0x170 [ 12.973492][ T235] ? do_raw_spin_unlock+0x58/0x220 [ 12.973496][ T235] idempotent_init_module+0x335/0x620 [ 12.973501][ T235] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.973508][ T235] ? cap_capable+0x94/0x230 [ 12.973515][ T235] __x64_sys_finit_module+0xca/0x150 [ 12.973519][ T235] ? do_syscall_64+0x85/0x380 [ 12.973522][ T235] do_syscall_64+0xc1/0x380 [ 12.973526][ T235] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.973529][ T235] RIP: 0033:0x7fcd978d2e5d [ 12.973534][ T235] 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 [ 12.973537][ T235] RSP: 002b:00007ffdd9acd308 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.973541][ T235] RAX: ffffffffffffffda RBX: 000055a472668960 RCX: 00007fcd978d2e5d [ 12.973544][ T235] RDX: 0000000000000000 RSI: 000055a454a4fa2a RDI: 0000000000000005 [ 12.973545][ T235] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffdd9acd440 [ 12.973547][ T235] R10: 0000000000000005 R11: 0000000000000246 R12: 000055a454a4fa2a [ 12.973549][ T235] R13: 000055a472668b10 R14: 000055a472668db0 R15: 0000000000000000 [ 12.973555][ T235] [ 12.973556][ T235] [ 12.985023][ T235] Allocated by task 228: [ 12.985163][ T235] kasan_save_stack+0x24/0x50 [ 12.985354][ T235] kasan_save_track+0x14/0x30 [ 12.985544][ T235] __kasan_kmalloc+0x7f/0x90 [ 12.985736][ T235] __kmalloc_noprof+0x1d4/0x470 [ 12.985925][ T235] virtqueue_add_split+0x6a3/0x1920 [ 12.986125][ T235] virtqueue_add_sgs+0x143/0x270 [ 12.986313][ T235] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.986503][ T235] virtio_fs_send_req+0x13a/0x710 [ 12.986690][ T235] __fuse_simple_request+0x22a/0xb50 [ 12.986881][ T235] fuse_readlink_folio+0x20b/0x400 [ 12.987071][ T235] fuse_get_link+0x12d/0x350 [ 12.987267][ T235] pick_link+0x7a2/0x1160 [ 12.987410][ T235] step_into+0x85a/0xfc0 [ 12.987552][ T235] link_path_walk+0x3c2/0xa10 [ 12.987742][ T235] path_openat+0x14d/0x380 [ 12.987930][ T235] do_filp_open+0x1d7/0x420 [ 12.988116][ T235] do_sys_openat2+0xd4/0x160 [ 12.988303][ T235] __x64_sys_openat+0x122/0x1e0 [ 12.988489][ T235] do_syscall_64+0xc1/0x380 [ 12.988679][ T235] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.988916][ T235] [ 12.989010][ T235] Freed by task 61: [ 12.989148][ T235] kasan_save_stack+0x24/0x50 [ 12.989339][ T235] kasan_save_track+0x14/0x30 [ 12.989526][ T235] kasan_save_free_info+0x3b/0x60 [ 12.989716][ T235] __kasan_slab_free+0x38/0x50 [ 12.989901][ T235] kfree+0x144/0x320 [ 12.990043][ T235] detach_buf_split+0x48d/0x6f0 [ 12.990235][ T235] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.990468][ T235] virtio_fs_requests_done_work+0x231/0x890 [ 12.990699][ T235] process_one_work+0xe43/0x1660 [ 12.990889][ T235] worker_thread+0x591/0xcf0 [ 12.991077][ T235] kthread+0x37b/0x600 [ 12.991221][ T235] ret_from_fork+0x243/0x320 [ 12.991411][ T235] ret_from_fork_asm+0x1a/0x30 [ 12.991601][ T235] [ 12.991700][ T235] The buggy address belongs to the object at ffff88800192c720 [ 12.991700][ T235] which belongs to the cache kmalloc-96 of size 96 [ 12.992150][ T235] The buggy address is located 0 bytes inside of [ 12.992150][ T235] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.992602][ T235] [ 12.992698][ T235] The buggy address belongs to the physical page: [ 12.992932][ T235] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800192ca20 pfn:0x192c [ 12.993313][ T235] flags: 0x80000000000200(workingset|node=0|zone=1) [ 12.993553][ T235] page_type: f5(slab) [ 12.993700][ T235] raw: 0080000000000200 ffff888001042340 ffffea00002a63d0 ffffea00000a3190 [ 12.994041][ T235] raw: ffff88800192ca20 000000000010000f 00000000f5000000 0000000000000000 [ 12.994380][ T235] page dumped because: kasan: bad access detected [ 12.994611][ T235] [ 12.994707][ T235] Memory state around the buggy address: [ 12.994887][ T235] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.995160][ T235] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.995436][ T235] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.995711][ T235] ^ [ 12.995895][ T235] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.996177][ T235] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.996446][ T235] ================================================================== [ 12.996740][ T235] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr