[ 13.286477][ T249] ================================================================== [ 13.286753][ T249] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 13.287003][ T249] Read of size 1 at addr ffff88800192c720 by task modprobe/249 [ 13.287250][ T249] [ 13.287336][ T249] CPU: 2 UID: 0 PID: 249 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 13.287341][ T249] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 13.287343][ T249] Call Trace: [ 13.287345][ T249] [ 13.287346][ T249] dump_stack_lvl+0x82/0xd0 [ 13.287354][ T249] print_address_description.constprop.0+0x2c/0x400 [ 13.287360][ T249] ? emit_its_trampoline+0xa5/0x300 [ 13.287363][ T249] print_report+0xb4/0x270 [ 13.287366][ T249] ? emit_its_trampoline+0xa5/0x300 [ 13.287369][ T249] ? kasan_addr_to_slab+0x25/0x80 [ 13.287372][ T249] ? emit_its_trampoline+0xa5/0x300 [ 13.287374][ T249] kasan_report+0xca/0x100 [ 13.287378][ T249] ? emit_its_trampoline+0xa5/0x300 [ 13.287382][ T249] ? emit_its_trampoline+0xa5/0x300 [ 13.287384][ T249] __kasan_check_byte+0x3a/0x50 [ 13.287387][ T249] krealloc_noprof+0x3d/0x320 [ 13.287391][ T249] ? execmem_alloc+0xc0/0x240 [ 13.287396][ T249] emit_its_trampoline+0xa5/0x300 [ 13.287398][ T249] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 13.287405][ T249] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 13.287408][ T249] apply_retpolines+0xcf/0x550 [ 13.287412][ T249] ? __pfx_apply_retpolines+0x10/0x10 [ 13.287415][ T249] ? __pfx___mutex_lock+0x10/0x10 [ 13.287425][ T249] module_finalize+0x3d5/0x9d0 [ 13.287432][ T249] ? add_kallsyms+0x7bf/0xf40 [ 13.287436][ T249] ? __pfx_module_finalize+0x10/0x10 [ 13.287440][ T249] ? __pfx_cmp_ex_sort+0x10/0x10 [ 13.287444][ T249] ? __pfx_swap_ex+0x10/0x10 [ 13.287448][ T249] load_module+0x139a/0x2660 [ 13.287456][ T249] ? __pfx_load_module+0x10/0x10 [ 13.287459][ T249] ? kernel_read_file+0x3f5/0x550 [ 13.287464][ T249] ? kernel_read_file+0x3d0/0x550 [ 13.287468][ T249] ? __pfx_kernel_read_file+0x10/0x10 [ 13.287470][ T249] ? add_chain_cache+0x110/0x370 [ 13.287476][ T249] ? init_module_from_file+0xe9/0x150 [ 13.287480][ T249] init_module_from_file+0xe9/0x150 [ 13.287483][ T249] ? __pfx_init_module_from_file+0x10/0x10 [ 13.287492][ T249] ? idempotent_init_module+0x31a/0x620 [ 13.287495][ T249] ? __lock_release+0x5d/0x170 [ 13.287500][ T249] ? do_raw_spin_unlock+0x58/0x220 [ 13.287504][ T249] idempotent_init_module+0x335/0x620 [ 13.287509][ T249] ? __pfx_idempotent_init_module+0x10/0x10 [ 13.287516][ T249] ? cap_capable+0x94/0x230 [ 13.287523][ T249] __x64_sys_finit_module+0xca/0x150 [ 13.287526][ T249] ? do_syscall_64+0x85/0x380 [ 13.287530][ T249] do_syscall_64+0xc1/0x380 [ 13.287533][ T249] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.287536][ T249] RIP: 0033:0x7fc4bd352e5d [ 13.287540][ T249] 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 [ 13.287543][ T249] RSP: 002b:00007ffe3c00b868 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 13.287547][ T249] RAX: ffffffffffffffda RBX: 000055f449d19960 RCX: 00007fc4bd352e5d [ 13.287549][ T249] RDX: 0000000000000000 RSI: 000055f419008a2a RDI: 0000000000000005 [ 13.287550][ T249] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe3c00b9a0 [ 13.287552][ T249] R10: 0000000000000005 R11: 0000000000000246 R12: 000055f419008a2a [ 13.287554][ T249] R13: 000055f449d19b10 R14: 000055f449d19db0 R15: 0000000000000000 [ 13.287560][ T249] [ 13.287561][ T249] [ 13.297775][ T249] Allocated by task 235: [ 13.297900][ T249] kasan_save_stack+0x24/0x50 [ 13.298071][ T249] kasan_save_track+0x14/0x30 [ 13.298258][ T249] __kasan_kmalloc+0x7f/0x90 [ 13.298430][ T249] __kmalloc_noprof+0x1d4/0x470 [ 13.298603][ T249] virtqueue_add_split+0x6a3/0x1920 [ 13.298778][ T249] virtqueue_add_sgs+0x143/0x270 [ 13.298948][ T249] virtio_fs_enqueue_req+0x58c/0xfe0 [ 13.299122][ T249] virtio_fs_send_req+0x13a/0x710 [ 13.299292][ T249] __fuse_simple_request+0x22a/0xb50 [ 13.299476][ T249] fuse_readlink_folio+0x20b/0x400 [ 13.299642][ T249] fuse_get_link+0x12d/0x350 [ 13.299828][ T249] pick_link+0x7a2/0x1160 [ 13.299960][ T249] step_into+0x85a/0xfc0 [ 13.300089][ T249] link_path_walk+0x3c2/0xa10 [ 13.300260][ T249] path_lookupat+0x117/0x630 [ 13.300431][ T249] filename_lookup+0x1c4/0x470 [ 13.300603][ T249] vfs_statx+0xaa/0x2e0 [ 13.300733][ T249] vfs_fstatat+0x68/0xa0 [ 13.300865][ T249] __do_sys_newfstatat+0x6a/0xc0 [ 13.301037][ T249] do_syscall_64+0xc1/0x380 [ 13.301218][ T249] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 13.301430][ T249] [ 13.301536][ T249] Freed by task 57: [ 13.301663][ T249] kasan_save_stack+0x24/0x50 [ 13.301838][ T249] kasan_save_track+0x14/0x30 [ 13.302008][ T249] kasan_save_free_info+0x3b/0x60 [ 13.302181][ T249] __kasan_slab_free+0x38/0x50 [ 13.302352][ T249] kfree+0x144/0x320 [ 13.302486][ T249] detach_buf_split+0x48d/0x6f0 [ 13.302659][ T249] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 13.302870][ T249] virtio_fs_requests_done_work+0x231/0x890 [ 13.303082][ T249] process_one_work+0xe43/0x1660 [ 13.303254][ T249] worker_thread+0x591/0xcf0 [ 13.303424][ T249] kthread+0x37b/0x600 [ 13.303562][ T249] ret_from_fork+0x243/0x320 [ 13.303729][ T249] ret_from_fork_asm+0x1a/0x30 [ 13.303900][ T249] [ 13.304001][ T249] The buggy address belongs to the object at ffff88800192c720 [ 13.304001][ T249] which belongs to the cache kmalloc-96 of size 96 [ 13.304409][ T249] The buggy address is located 0 bytes inside of [ 13.304409][ T249] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 13.304819][ T249] [ 13.304908][ T249] The buggy address belongs to the physical page: [ 13.305115][ T249] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800192ca20 pfn:0x192c [ 13.305483][ T249] flags: 0x80000000000200(workingset|node=0|zone=1) [ 13.305710][ T249] page_type: f5(slab) [ 13.305841][ T249] raw: 0080000000000200 ffff888001042340 ffffea00000951d0 ffffea00000a7910 [ 13.306146][ T249] raw: ffff88800192ca20 000000000010000e 00000000f5000000 0000000000000000 [ 13.306442][ T249] page dumped because: kasan: bad access detected [ 13.306646][ T249] [ 13.306728][ T249] Memory state around the buggy address: [ 13.306888][ T249] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 13.307129][ T249] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.307373][ T249] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 13.307615][ T249] ^ [ 13.307774][ T249] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 13.308035][ T249] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 13.308285][ T249] ================================================================== [ 13.308659][ T249] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr