[ 13.947939][ T241] ================================================================== [ 13.948308][ T241] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.948567][ T241] Read of size 1 at addr ffff88800192c720 by task modprobe/241 [ 13.948820][ T241] [ 13.948910][ T241] CPU: 2 UID: 0 PID: 241 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.948915][ T241] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.948917][ T241] Call Trace: [ 13.948920][ T241] [ 13.948922][ T241] dump_stack_lvl+0x82/0xd0 [ 13.948932][ T241] print_address_description.constprop.0+0x2c/0x400 [ 13.948940][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.948944][ T241] print_report+0xb4/0x270 [ 13.948947][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.948949][ T241] ? kasan_addr_to_slab+0x25/0x80 [ 13.948953][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.948956][ T241] kasan_report+0xca/0x100 [ 13.948959][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.948964][ T241] ? emit_its_trampoline+0xa5/0x300 [ 13.948967][ T241] __kasan_check_byte+0x3a/0x50 [ 13.948970][ T241] krealloc_noprof+0x3d/0x320 [ 13.948974][ T241] ? execmem_alloc+0xc0/0x240 [ 13.948980][ T241] emit_its_trampoline+0xa5/0x300 [ 13.948983][ T241] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.948990][ T241] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.948994][ T241] apply_retpolines+0xcf/0x550 [ 13.948999][ T241] ? __pfx_apply_retpolines+0x10/0x10 [ 13.949002][ T241] ? __pfx___mutex_lock+0x10/0x10 [ 13.949012][ T241] module_finalize+0x3d5/0x9d0 [ 13.949020][ T241] ? add_kallsyms+0x7bf/0xf40 [ 13.949026][ T241] ? __pfx_module_finalize+0x10/0x10 [ 13.949030][ T241] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.949034][ T241] ? __pfx_swap_ex+0x10/0x10 [ 13.949038][ T241] load_module+0x139a/0x2660 [ 13.949047][ T241] ? __pfx_load_module+0x10/0x10 [ 13.949051][ T241] ? kernel_read_file+0x3f5/0x550 [ 13.949057][ T241] ? kernel_read_file+0x3d0/0x550 [ 13.949061][ T241] ? __pfx_kernel_read_file+0x10/0x10 [ 13.949064][ T241] ? add_chain_cache+0x110/0x370 [ 13.949071][ T241] ? init_module_from_file+0xe9/0x150 [ 13.949075][ T241] init_module_from_file+0xe9/0x150 [ 13.949078][ T241] ? __pfx_init_module_from_file+0x10/0x10 [ 13.949087][ T241] ? idempotent_init_module+0x31a/0x620 [ 13.949091][ T241] ? __lock_release+0x5d/0x170 [ 13.949096][ T241] ? do_raw_spin_unlock+0x58/0x220 [ 13.949101][ T241] idempotent_init_module+0x335/0x620 [ 13.949105][ T241] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.949113][ T241] ? cap_capable+0x94/0x230 [ 13.949121][ T241] __x64_sys_finit_module+0xca/0x150 [ 13.949125][ T241] ? do_syscall_64+0x85/0x380 [ 13.949129][ T241] do_syscall_64+0xc1/0x380 [ 13.949133][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.949136][ T241] RIP: 0033:0x7f403cd30e5d [ 13.949142][ T241] 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 [ 13.949145][ T241] RSP: 002b:00007ffe2bb6df28 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.949149][ T241] RAX: ffffffffffffffda RBX: 000055f24c110960 RCX: 00007f403cd30e5d [ 13.949151][ T241] RDX: 0000000000000000 RSI: 000055f20c52ba2a RDI: 0000000000000005 [ 13.949153][ T241] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe2bb6e060 [ 13.949155][ T241] R10: 0000000000000005 R11: 0000000000000246 R12: 000055f20c52ba2a [ 13.949157][ T241] R13: 000055f24c110b10 R14: 000055f24c110db0 R15: 0000000000000000 [ 13.949164][ T241] [ 13.949165][ T241] [ 13.959673][ T241] Allocated by task 218: [ 13.959807][ T241] kasan_save_stack+0x24/0x50 [ 13.959984][ T241] kasan_save_track+0x14/0x30 [ 13.960157][ T241] __kasan_kmalloc+0x7f/0x90 [ 13.960331][ T241] __kmalloc_noprof+0x1d4/0x470 [ 13.960505][ T241] virtqueue_add_split+0x6a3/0x1920 [ 13.960684][ T241] virtqueue_add_sgs+0x143/0x270 [ 13.960865][ T241] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.961041][ T241] virtio_fs_send_req+0x13a/0x710 [ 13.961220][ T241] __fuse_simple_request+0x22a/0xb50 [ 13.961396][ T241] fuse_readlink_folio+0x20b/0x400 [ 13.961569][ T241] fuse_get_link+0x12d/0x350 [ 13.961743][ T241] pick_link+0x7a2/0x1160 [ 13.961877][ T241] step_into+0x85a/0xfc0 [ 13.962008][ T241] link_path_walk+0x3c2/0xa10 [ 13.962180][ T241] path_openat+0x14d/0x380 [ 13.962356][ T241] do_filp_open+0x1d7/0x420 [ 13.962529][ T241] do_sys_openat2+0xd4/0x160 [ 13.962701][ T241] __x64_sys_openat+0x122/0x1e0 [ 13.962881][ T241] do_syscall_64+0xc1/0x380 [ 13.963054][ T241] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.963267][ T241] [ 13.963353][ T241] Freed by task 61: [ 13.963481][ T241] kasan_save_stack+0x24/0x50 [ 13.963655][ T241] kasan_save_track+0x14/0x30 [ 13.963829][ T241] kasan_save_free_info+0x3b/0x60 [ 13.964000][ T241] __kasan_slab_free+0x38/0x50 [ 13.964170][ T241] kfree+0x144/0x320 [ 13.964298][ T241] detach_buf_split+0x48d/0x6f0 [ 13.964471][ T241] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.964682][ T241] virtio_fs_requests_done_work+0x231/0x890 [ 13.964895][ T241] process_one_work+0xe43/0x1660 [ 13.965074][ T241] worker_thread+0x591/0xcf0 [ 13.965245][ T241] kthread+0x37b/0x600 [ 13.965377][ T241] ret_from_fork+0x243/0x320 [ 13.965550][ T241] ret_from_fork_asm+0x1a/0x30 [ 13.965723][ T241] [ 13.965810][ T241] The buggy address belongs to the object at ffff88800192c720 [ 13.965810][ T241] which belongs to the cache kmalloc-96 of size 96 [ 13.966218][ T241] The buggy address is located 0 bytes inside of [ 13.966218][ T241] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.966630][ T241] [ 13.966716][ T241] The buggy address belongs to the physical page: [ 13.966924][ T241] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.967231][ T241] flags: 0x80000000000000(node=0|zone=1) [ 13.967415][ T241] page_type: f5(slab) [ 13.967553][ T241] raw: 0080000000000000 ffff888001042340 ffffea00000a0e50 ffffea000009a890 [ 13.967866][ T241] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.968171][ T241] page dumped because: kasan: bad access detected [ 13.968381][ T241] [ 13.968467][ T241] Memory state around the buggy address: [ 13.968636][ T241] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.968886][ T241] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.969134][ T241] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.969385][ T241] ^ [ 13.969550][ T241] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.969815][ T241] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.970063][ T241] ================================================================== [ 13.970498][ T241] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr