[ 13.300787][ T248] ================================================================== [ 13.301141][ T248] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.301400][ T248] Read of size 1 at addr ffff88800192c720 by task modprobe/248 [ 13.301649][ T248] [ 13.301737][ T248] CPU: 2 UID: 0 PID: 248 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.301742][ T248] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.301744][ T248] Call Trace: [ 13.301746][ T248] [ 13.301748][ T248] dump_stack_lvl+0x82/0xd0 [ 13.301756][ T248] print_address_description.constprop.0+0x2c/0x400 [ 13.301763][ T248] ? emit_its_trampoline+0xa5/0x300 [ 13.301766][ T248] print_report+0xb4/0x270 [ 13.301769][ T248] ? emit_its_trampoline+0xa5/0x300 [ 13.301771][ T248] ? kasan_addr_to_slab+0x25/0x80 [ 13.301774][ T248] ? emit_its_trampoline+0xa5/0x300 [ 13.301777][ T248] kasan_report+0xca/0x100 [ 13.301780][ T248] ? emit_its_trampoline+0xa5/0x300 [ 13.301785][ T248] ? emit_its_trampoline+0xa5/0x300 [ 13.301787][ T248] __kasan_check_byte+0x3a/0x50 [ 13.301791][ T248] krealloc_noprof+0x3d/0x320 [ 13.301794][ T248] ? execmem_alloc+0xc0/0x240 [ 13.301799][ T248] emit_its_trampoline+0xa5/0x300 [ 13.301802][ T248] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.301808][ T248] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.301812][ T248] apply_retpolines+0xcf/0x550 [ 13.301816][ T248] ? __pfx_apply_retpolines+0x10/0x10 [ 13.301819][ T248] ? __pfx___mutex_lock+0x10/0x10 [ 13.301829][ T248] module_finalize+0x3d5/0x9d0 [ 13.301836][ T248] ? add_kallsyms+0x7bf/0xf40 [ 13.301841][ T248] ? __pfx_module_finalize+0x10/0x10 [ 13.301845][ T248] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.301848][ T248] ? __pfx_swap_ex+0x10/0x10 [ 13.301853][ T248] load_module+0x139a/0x2660 [ 13.301861][ T248] ? __pfx_load_module+0x10/0x10 [ 13.301864][ T248] ? kernel_read_file+0x3f5/0x550 [ 13.301870][ T248] ? kernel_read_file+0x3d0/0x550 [ 13.301873][ T248] ? __pfx_kernel_read_file+0x10/0x10 [ 13.301876][ T248] ? add_chain_cache+0x110/0x370 [ 13.301882][ T248] ? init_module_from_file+0xe9/0x150 [ 13.301886][ T248] init_module_from_file+0xe9/0x150 [ 13.301890][ T248] ? __pfx_init_module_from_file+0x10/0x10 [ 13.301898][ T248] ? idempotent_init_module+0x31a/0x620 [ 13.301902][ T248] ? __lock_release+0x5d/0x170 [ 13.301907][ T248] ? do_raw_spin_unlock+0x58/0x220 [ 13.301911][ T248] idempotent_init_module+0x335/0x620 [ 13.301916][ T248] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.301924][ T248] ? cap_capable+0x94/0x230 [ 13.301930][ T248] __x64_sys_finit_module+0xca/0x150 [ 13.301934][ T248] ? do_syscall_64+0x85/0x380 [ 13.301938][ T248] do_syscall_64+0xc1/0x380 [ 13.301941][ T248] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.301944][ T248] RIP: 0033:0x7f461255be5d [ 13.301948][ T248] 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 [ 13.301951][ T248] RSP: 002b:00007ffdcc33b498 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.301955][ T248] RAX: ffffffffffffffda RBX: 000055a9e41bb960 RCX: 00007f461255be5d [ 13.301957][ T248] RDX: 0000000000000000 RSI: 000055a9de120a2a RDI: 0000000000000005 [ 13.301959][ T248] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffdcc33b5d0 [ 13.301961][ T248] R10: 0000000000000005 R11: 0000000000000246 R12: 000055a9de120a2a [ 13.301962][ T248] R13: 000055a9e41bbb10 R14: 000055a9e41bbdb0 R15: 0000000000000000 [ 13.301969][ T248] [ 13.301970][ T248] [ 13.312265][ T248] Allocated by task 245: [ 13.312396][ T248] kasan_save_stack+0x24/0x50 [ 13.312571][ T248] kasan_save_track+0x14/0x30 [ 13.312743][ T248] __kasan_kmalloc+0x7f/0x90 [ 13.312914][ T248] __kmalloc_noprof+0x1d4/0x470 [ 13.313084][ T248] virtqueue_add_split+0x6a3/0x1920 [ 13.313257][ T248] virtqueue_add_sgs+0x143/0x270 [ 13.313427][ T248] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.313599][ T248] virtio_fs_send_req+0x13a/0x710 [ 13.313769][ T248] __fuse_simple_request+0x22a/0xb50 [ 13.313942][ T248] fuse_readlink_folio+0x20b/0x400 [ 13.314113][ T248] fuse_get_link+0x12d/0x350 [ 13.314283][ T248] pick_link+0x7a2/0x1160 [ 13.314413][ T248] step_into+0x85a/0xfc0 [ 13.314544][ T248] link_path_walk+0x3c2/0xa10 [ 13.314718][ T248] path_openat+0x14d/0x380 [ 13.314888][ T248] do_filp_open+0x1d7/0x420 [ 13.315058][ T248] do_open_execat+0xaa/0x2e0 [ 13.315228][ T248] open_exec+0x2b/0x50 [ 13.315356][ T248] load_elf_binary+0x51e/0x2960 [ 13.315528][ T248] exec_binprm+0x258/0x640 [ 13.315697][ T248] bprm_execve+0x1af/0x490 [ 13.315870][ T248] do_execveat_common.isra.0+0x3f5/0x550 [ 13.316041][ T248] __x64_sys_execve+0x8e/0xb0 [ 13.316210][ T248] do_syscall_64+0xc1/0x380 [ 13.316381][ T248] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.316592][ T248] [ 13.316686][ T248] Freed by task 241: [ 13.316812][ T248] kasan_save_stack+0x24/0x50 [ 13.316983][ T248] kasan_save_track+0x14/0x30 [ 13.317155][ T248] kasan_save_free_info+0x3b/0x60 [ 13.317326][ T248] __kasan_slab_free+0x38/0x50 [ 13.317496][ T248] kfree+0x144/0x320 [ 13.317624][ T248] detach_buf_split+0x48d/0x6f0 [ 13.317794][ T248] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.318003][ T248] virtio_fs_requests_done_work+0x231/0x890 [ 13.318215][ T248] process_one_work+0xe43/0x1660 [ 13.318388][ T248] worker_thread+0x591/0xcf0 [ 13.318560][ T248] kthread+0x37b/0x600 [ 13.318689][ T248] ret_from_fork+0x243/0x320 [ 13.318860][ T248] ret_from_fork_asm+0x1a/0x30 [ 13.319029][ T248] [ 13.319119][ T248] The buggy address belongs to the object at ffff88800192c720 [ 13.319119][ T248] which belongs to the cache kmalloc-96 of size 96 [ 13.319525][ T248] The buggy address is located 0 bytes inside of [ 13.319525][ T248] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.319936][ T248] [ 13.320021][ T248] The buggy address belongs to the physical page: [ 13.320245][ T248] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 13.320545][ T248] flags: 0x80000000000000(node=0|zone=1) [ 13.320720][ T248] page_type: f5(slab) [ 13.320864][ T248] raw: 0080000000000000 ffff888001042340 ffffea0000042fd0 ffffea0000304950 [ 13.321169][ T248] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 13.321470][ T248] page dumped because: kasan: bad access detected [ 13.321683][ T248] [ 13.321767][ T248] Memory state around the buggy address: [ 13.321931][ T248] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.322182][ T248] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.322427][ T248] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.322676][ T248] ^ [ 13.322846][ T248] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.323095][ T248] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.323340][ T248] ================================================================== [ 13.323772][ T248] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr