[ 16.424928][ T266] ================================================================== [ 16.425253][ T266] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 16.425527][ T266] Read of size 1 at addr ffff888001926720 by task modprobe/266 [ 16.425784][ T266] [ 16.425874][ T266] CPU: 3 UID: 0 PID: 266 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 16.425879][ T266] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 16.425881][ T266] Call Trace: [ 16.425883][ T266] [ 16.425885][ T266] dump_stack_lvl+0x82/0xd0 [ 16.425892][ T266] print_address_description.constprop.0+0x2c/0x400 [ 16.425897][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.425901][ T266] print_report+0xb4/0x270 [ 16.425904][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.425907][ T266] ? kasan_addr_to_slab+0x25/0x80 [ 16.425913][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.425916][ T266] kasan_report+0xca/0x100 [ 16.425919][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.425924][ T266] ? emit_its_trampoline+0xa5/0x300 [ 16.425928][ T266] __kasan_check_byte+0x3a/0x50 [ 16.425931][ T266] krealloc_noprof+0x3d/0x320 [ 16.425936][ T266] ? execmem_alloc+0xc0/0x240 [ 16.425941][ T266] emit_its_trampoline+0xa5/0x300 [ 16.425944][ T266] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 16.425950][ T266] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 16.425954][ T266] apply_retpolines+0xcf/0x550 [ 16.425959][ T266] ? __pfx_apply_retpolines+0x10/0x10 [ 16.425963][ T266] ? __pfx___mutex_lock+0x10/0x10 [ 16.425973][ T266] module_finalize+0x3d5/0x9d0 [ 16.425979][ T266] ? add_kallsyms+0x7bf/0xf40 [ 16.425985][ T266] ? __pfx_module_finalize+0x10/0x10 [ 16.425989][ T266] ? __pfx_cmp_ex_sort+0x10/0x10 [ 16.425992][ T266] ? __pfx_swap_ex+0x10/0x10 [ 16.425997][ T266] load_module+0x139a/0x2660 [ 16.426004][ T266] ? __pfx_load_module+0x10/0x10 [ 16.426008][ T266] ? kernel_read_file+0x3f5/0x550 [ 16.426015][ T266] ? kernel_read_file+0x3d0/0x550 [ 16.426019][ T266] ? __pfx_kernel_read_file+0x10/0x10 [ 16.426023][ T266] ? add_chain_cache+0x110/0x370 [ 16.426029][ T266] ? init_module_from_file+0xe9/0x150 [ 16.426032][ T266] init_module_from_file+0xe9/0x150 [ 16.426035][ T266] ? __pfx_init_module_from_file+0x10/0x10 [ 16.426044][ T266] ? idempotent_init_module+0x31a/0x620 [ 16.426047][ T266] ? __lock_release+0x5d/0x170 [ 16.426051][ T266] ? do_raw_spin_unlock+0x58/0x220 [ 16.426056][ T266] idempotent_init_module+0x335/0x620 [ 16.426060][ T266] ? __pfx_idempotent_init_module+0x10/0x10 [ 16.426067][ T266] ? cap_capable+0x94/0x230 [ 16.426074][ T266] __x64_sys_finit_module+0xca/0x150 [ 16.426077][ T266] ? do_syscall_64+0x85/0x380 [ 16.426082][ T266] do_syscall_64+0xc1/0x380 [ 16.426086][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.426089][ T266] RIP: 0033:0x7f490ab0ae5d [ 16.426093][ T266] 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 [ 16.426096][ T266] RSP: 002b:00007fff95001518 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 16.426100][ T266] RAX: ffffffffffffffda RBX: 00005592d0c87960 RCX: 00007f490ab0ae5d [ 16.426103][ T266] RDX: 0000000000000000 RSI: 00005592c6e4aa2a RDI: 0000000000000005 [ 16.426104][ T266] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff95001650 [ 16.426106][ T266] R10: 0000000000000005 R11: 0000000000000246 R12: 00005592c6e4aa2a [ 16.426108][ T266] R13: 00005592d0c87b10 R14: 00005592d0c87db0 R15: 0000000000000000 [ 16.426114][ T266] [ 16.426116][ T266] [ 16.436863][ T266] Allocated by task 132: [ 16.437008][ T266] kasan_save_stack+0x24/0x50 [ 16.437195][ T266] kasan_save_track+0x14/0x30 [ 16.437374][ T266] __kasan_kmalloc+0x7f/0x90 [ 16.437550][ T266] __kmalloc_noprof+0x1d4/0x470 [ 16.437727][ T266] virtqueue_add_split+0x6a3/0x1920 [ 16.437907][ T266] virtqueue_add_sgs+0x143/0x270 [ 16.438089][ T266] virtio_fs_enqueue_req+0x58c/0xfe0 [ 16.438269][ T266] virtio_fs_send_req+0x13a/0x710 [ 16.438447][ T266] __fuse_simple_request+0x22a/0xb50 [ 16.438629][ T266] fuse_flush+0x41a/0x620 [ 16.438765][ T266] ovl_flush+0x113/0x170 [ 16.438901][ T266] filp_flush+0xe9/0x170 [ 16.439041][ T266] __x64_sys_close+0x72/0xd0 [ 16.439221][ T266] do_syscall_64+0xc1/0x380 [ 16.439401][ T266] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 16.439620][ T266] [ 16.439710][ T266] Freed by task 51: [ 16.439845][ T266] kasan_save_stack+0x24/0x50 [ 16.440026][ T266] kasan_save_track+0x14/0x30 [ 16.440205][ T266] kasan_save_free_info+0x3b/0x60 [ 16.440382][ T266] __kasan_slab_free+0x38/0x50 [ 16.440561][ T266] kfree+0x144/0x320 [ 16.440697][ T266] detach_buf_split+0x48d/0x6f0 [ 16.440870][ T266] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 16.441094][ T266] virtio_fs_requests_done_work+0x231/0x890 [ 16.441320][ T266] process_one_work+0xe43/0x1660 [ 16.441500][ T266] worker_thread+0x591/0xcf0 [ 16.441680][ T266] kthread+0x37b/0x600 [ 16.441819][ T266] ret_from_fork+0x243/0x320 [ 16.442000][ T266] ret_from_fork_asm+0x1a/0x30 [ 16.442183][ T266] [ 16.442271][ T266] The buggy address belongs to the object at ffff888001926720 [ 16.442271][ T266] which belongs to the cache kmalloc-96 of size 96 [ 16.442695][ T266] The buggy address is located 0 bytes inside of [ 16.442695][ T266] freed 96-byte region [ffff888001926720, ffff888001926780) [ 16.443127][ T266] [ 16.443216][ T266] The buggy address belongs to the physical page: [ 16.443429][ T266] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 16.443744][ T266] flags: 0x80000000000000(node=0|zone=1) [ 16.443927][ T266] page_type: f5(slab) [ 16.444068][ T266] raw: 0080000000000000 ffff888001042340 ffffea0000252410 ffffea0000047050 [ 16.444391][ T266] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 16.444706][ T266] page dumped because: kasan: bad access detected [ 16.444923][ T266] [ 16.445014][ T266] Memory state around the buggy address: [ 16.445186][ T266] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 16.445446][ T266] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.445703][ T266] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 16.445960][ T266] ^ [ 16.446135][ T266] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 16.446390][ T266] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 16.446648][ T266] ================================================================== [ 16.447062][ T266] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr