[ 12.608477][ T238] ================================================================== [ 12.608846][ T238] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.609117][ T238] Read of size 1 at addr ffff88800192c720 by task modprobe/238 [ 12.609378][ T238] [ 12.609471][ T238] CPU: 3 UID: 0 PID: 238 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.609477][ T238] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.609480][ T238] Call Trace: [ 12.609482][ T238] [ 12.609484][ T238] dump_stack_lvl+0x82/0xd0 [ 12.609495][ T238] print_address_description.constprop.0+0x2c/0x400 [ 12.609503][ T238] ? emit_its_trampoline+0xa5/0x300 [ 12.609506][ T238] print_report+0xb4/0x270 [ 12.609509][ T238] ? emit_its_trampoline+0xa5/0x300 [ 12.609511][ T238] ? kasan_addr_to_slab+0x25/0x80 [ 12.609515][ T238] ? emit_its_trampoline+0xa5/0x300 [ 12.609517][ T238] kasan_report+0xca/0x100 [ 12.609520][ T238] ? emit_its_trampoline+0xa5/0x300 [ 12.609525][ T238] ? emit_its_trampoline+0xa5/0x300 [ 12.609527][ T238] __kasan_check_byte+0x3a/0x50 [ 12.609530][ T238] krealloc_noprof+0x3d/0x320 [ 12.609534][ T238] ? execmem_alloc+0xc0/0x240 [ 12.609540][ T238] emit_its_trampoline+0xa5/0x300 [ 12.609542][ T238] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.609549][ T238] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.609553][ T238] apply_retpolines+0xcf/0x550 [ 12.609557][ T238] ? __pfx_apply_retpolines+0x10/0x10 [ 12.609560][ T238] ? __pfx___mutex_lock+0x10/0x10 [ 12.609570][ T238] module_finalize+0x3d5/0x9d0 [ 12.609577][ T238] ? add_kallsyms+0x7bf/0xf40 [ 12.609583][ T238] ? __pfx_module_finalize+0x10/0x10 [ 12.609587][ T238] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.609590][ T238] ? __pfx_swap_ex+0x10/0x10 [ 12.609594][ T238] load_module+0x139a/0x2660 [ 12.609603][ T238] ? __pfx_load_module+0x10/0x10 [ 12.609606][ T238] ? kernel_read_file+0x3f5/0x550 [ 12.609612][ T238] ? kernel_read_file+0x3d0/0x550 [ 12.609616][ T238] ? __pfx_kernel_read_file+0x10/0x10 [ 12.609619][ T238] ? add_chain_cache+0x110/0x370 [ 12.609626][ T238] ? init_module_from_file+0xe9/0x150 [ 12.609629][ T238] init_module_from_file+0xe9/0x150 [ 12.609632][ T238] ? __pfx_init_module_from_file+0x10/0x10 [ 12.609641][ T238] ? idempotent_init_module+0x31a/0x620 [ 12.609644][ T238] ? __lock_release+0x5d/0x170 [ 12.609649][ T238] ? do_raw_spin_unlock+0x58/0x220 [ 12.609654][ T238] idempotent_init_module+0x335/0x620 [ 12.609658][ T238] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.609666][ T238] ? cap_capable+0x94/0x230 [ 12.609673][ T238] __x64_sys_finit_module+0xca/0x150 [ 12.609677][ T238] ? do_syscall_64+0x85/0x380 [ 12.609681][ T238] do_syscall_64+0xc1/0x380 [ 12.609684][ T238] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.609688][ T238] RIP: 0033:0x7fcf17388e5d [ 12.609692][ T238] 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 [ 12.609695][ T238] RSP: 002b:00007ffeeaa44028 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.609699][ T238] RAX: ffffffffffffffda RBX: 0000560c63ab1960 RCX: 00007fcf17388e5d [ 12.609701][ T238] RDX: 0000000000000000 RSI: 0000560c46e77a2a RDI: 0000000000000005 [ 12.609703][ T238] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffeeaa44160 [ 12.609705][ T238] R10: 0000000000000005 R11: 0000000000000246 R12: 0000560c46e77a2a [ 12.609706][ T238] R13: 0000560c63ab1b10 R14: 0000560c63ab1db0 R15: 0000000000000000 [ 12.609712][ T238] [ 12.609714][ T238] [ 12.620620][ T238] Allocated by task 231: [ 12.620759][ T238] kasan_save_stack+0x24/0x50 [ 12.620945][ T238] kasan_save_track+0x14/0x30 [ 12.621127][ T238] __kasan_kmalloc+0x7f/0x90 [ 12.621313][ T238] __kmalloc_noprof+0x1d4/0x470 [ 12.621503][ T238] virtqueue_add_split+0x6a3/0x1920 [ 12.621687][ T238] virtqueue_add_sgs+0x143/0x270 [ 12.621864][ T238] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.622042][ T238] virtio_fs_send_req+0x13a/0x710 [ 12.622221][ T238] __fuse_simple_request+0x22a/0xb50 [ 12.622401][ T238] fuse_readlink_folio+0x20b/0x400 [ 12.622579][ T238] fuse_get_link+0x12d/0x350 [ 12.622757][ T238] pick_link+0x7a2/0x1160 [ 12.622894][ T238] step_into+0x85a/0xfc0 [ 12.623030][ T238] link_path_walk+0x3c2/0xa10 [ 12.623210][ T238] path_lookupat+0x117/0x630 [ 12.623389][ T238] filename_lookup+0x1c4/0x470 [ 12.623591][ T238] user_path_at+0x3a/0x70 [ 12.623740][ T238] do_faccessat+0xc5/0x8b0 [ 12.623919][ T238] __x64_sys_access+0x5b/0x80 [ 12.624098][ T238] do_syscall_64+0xc1/0x380 [ 12.624275][ T238] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.624497][ T238] [ 12.624587][ T238] Freed by task 52: [ 12.624723][ T238] kasan_save_stack+0x24/0x50 [ 12.624908][ T238] kasan_save_track+0x14/0x30 [ 12.625086][ T238] kasan_save_free_info+0x3b/0x60 [ 12.625264][ T238] __kasan_slab_free+0x38/0x50 [ 12.625442][ T238] kfree+0x144/0x320 [ 12.625575][ T238] detach_buf_split+0x48d/0x6f0 [ 12.625752][ T238] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.625972][ T238] virtio_fs_requests_done_work+0x231/0x890 [ 12.626191][ T238] process_one_work+0xe43/0x1660 [ 12.626374][ T238] worker_thread+0x591/0xcf0 [ 12.626550][ T238] kthread+0x37b/0x600 [ 12.626686][ T238] ret_from_fork+0x243/0x320 [ 12.626864][ T238] ret_from_fork_asm+0x1a/0x30 [ 12.627043][ T238] [ 12.627133][ T238] The buggy address belongs to the object at ffff88800192c720 [ 12.627133][ T238] which belongs to the cache kmalloc-96 of size 96 [ 12.627563][ T238] The buggy address is located 0 bytes inside of [ 12.627563][ T238] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.627992][ T238] [ 12.628081][ T238] The buggy address belongs to the physical page: [ 12.628299][ T238] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 12.628613][ T238] flags: 0x80000000000000(node=0|zone=1) [ 12.628803][ T238] page_type: f5(slab) [ 12.628943][ T238] raw: 0080000000000000 ffff888001042340 ffffea00002a8ed0 ffffea0000249610 [ 12.629263][ T238] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 12.629574][ T238] page dumped because: kasan: bad access detected [ 12.629793][ T238] [ 12.629883][ T238] Memory state around the buggy address: [ 12.630058][ T238] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.630319][ T238] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.630577][ T238] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.630861][ T238] ^ [ 12.631037][ T238] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.631315][ T238] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.631580][ T238] ================================================================== [ 12.632105][ T238] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr