[ 18.077952][ T269] ================================================================== [ 18.078269][ T269] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 18.078540][ T269] Read of size 1 at addr ffff888001926720 by task modprobe/269 [ 18.078806][ T269] [ 18.078901][ T269] CPU: 0 UID: 0 PID: 269 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 18.078906][ T269] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 18.078909][ T269] Call Trace: [ 18.078911][ T269] [ 18.078913][ T269] dump_stack_lvl+0x82/0xd0 [ 18.078922][ T269] print_address_description.constprop.0+0x2c/0x400 [ 18.078929][ T269] ? emit_its_trampoline+0xa5/0x300 [ 18.078933][ T269] print_report+0xb4/0x270 [ 18.078936][ T269] ? emit_its_trampoline+0xa5/0x300 [ 18.078939][ T269] ? kasan_addr_to_slab+0x25/0x80 [ 18.078945][ T269] ? emit_its_trampoline+0xa5/0x300 [ 18.078948][ T269] kasan_report+0xca/0x100 [ 18.078952][ T269] ? emit_its_trampoline+0xa5/0x300 [ 18.078958][ T269] ? emit_its_trampoline+0xa5/0x300 [ 18.078961][ T269] __kasan_check_byte+0x3a/0x50 [ 18.078964][ T269] krealloc_noprof+0x3d/0x320 [ 18.078970][ T269] ? execmem_alloc+0xc0/0x240 [ 18.078975][ T269] emit_its_trampoline+0xa5/0x300 [ 18.078979][ T269] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 18.078986][ T269] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 18.078990][ T269] apply_retpolines+0xcf/0x550 [ 18.078995][ T269] ? __pfx_apply_retpolines+0x10/0x10 [ 18.078999][ T269] ? __pfx___mutex_lock+0x10/0x10 [ 18.079010][ T269] module_finalize+0x3d5/0x9d0 [ 18.079017][ T269] ? add_kallsyms+0x7bf/0xf40 [ 18.079024][ T269] ? __pfx_module_finalize+0x10/0x10 [ 18.079029][ T269] ? __pfx_cmp_ex_sort+0x10/0x10 [ 18.079032][ T269] ? __pfx_swap_ex+0x10/0x10 [ 18.079036][ T269] load_module+0x139a/0x2660 [ 18.079044][ T269] ? __pfx_load_module+0x10/0x10 [ 18.079047][ T269] ? kernel_read_file+0x3f5/0x550 [ 18.079056][ T269] ? kernel_read_file+0x3d0/0x550 [ 18.079060][ T269] ? __pfx_kernel_read_file+0x10/0x10 [ 18.079064][ T269] ? add_chain_cache+0x110/0x370 [ 18.079070][ T269] ? init_module_from_file+0xe9/0x150 [ 18.079073][ T269] init_module_from_file+0xe9/0x150 [ 18.079077][ T269] ? __pfx_init_module_from_file+0x10/0x10 [ 18.079085][ T269] ? idempotent_init_module+0x31a/0x620 [ 18.079088][ T269] ? __lock_release+0x5d/0x170 [ 18.079094][ T269] ? do_raw_spin_unlock+0x58/0x220 [ 18.079099][ T269] idempotent_init_module+0x335/0x620 [ 18.079103][ T269] ? __pfx_idempotent_init_module+0x10/0x10 [ 18.079110][ T269] ? cap_capable+0x94/0x230 [ 18.079118][ T269] __x64_sys_finit_module+0xca/0x150 [ 18.079122][ T269] ? do_syscall_64+0x85/0x380 [ 18.079128][ T269] do_syscall_64+0xc1/0x380 [ 18.079131][ T269] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.079135][ T269] RIP: 0033:0x7f327b9b9e5d [ 18.079141][ T269] 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 [ 18.079145][ T269] RSP: 002b:00007ffe0728fcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 18.079149][ T269] RAX: ffffffffffffffda RBX: 000056228119a960 RCX: 00007f327b9b9e5d [ 18.079152][ T269] RDX: 0000000000000000 RSI: 000056227d7daa2a RDI: 0000000000000005 [ 18.079154][ T269] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe0728fe30 [ 18.079156][ T269] R10: 0000000000000005 R11: 0000000000000246 R12: 000056227d7daa2a [ 18.079158][ T269] R13: 000056228119ab10 R14: 000056228119adb0 R15: 0000000000000000 [ 18.079164][ T269] [ 18.079166][ T269] [ 18.090237][ T269] Allocated by task 225: [ 18.090378][ T269] kasan_save_stack+0x24/0x50 [ 18.090570][ T269] kasan_save_track+0x14/0x30 [ 18.090750][ T269] __kasan_kmalloc+0x7f/0x90 [ 18.090931][ T269] __kmalloc_noprof+0x1d4/0x470 [ 18.091114][ T269] virtqueue_add_split+0x6a3/0x1920 [ 18.091298][ T269] virtqueue_add_sgs+0x143/0x270 [ 18.091487][ T269] virtio_fs_enqueue_req+0x58c/0xfe0 [ 18.091671][ T269] virtio_fs_send_req+0x13a/0x710 [ 18.091852][ T269] __fuse_simple_request+0x22a/0xb50 [ 18.092033][ T269] fuse_file_put+0x170/0x1f0 [ 18.092214][ T269] fuse_release+0x134/0x1c0 [ 18.092392][ T269] __fput+0x35c/0xa80 [ 18.092529][ T269] task_work_run+0x134/0x220 [ 18.092715][ T269] exit_to_user_mode_loop+0xd1/0xe0 [ 18.092898][ T269] do_syscall_64+0x2fe/0x380 [ 18.093077][ T269] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 18.093301][ T269] [ 18.093393][ T269] Freed by task 61: [ 18.093529][ T269] kasan_save_stack+0x24/0x50 [ 18.093712][ T269] kasan_save_track+0x14/0x30 [ 18.093891][ T269] kasan_save_free_info+0x3b/0x60 [ 18.094076][ T269] __kasan_slab_free+0x38/0x50 [ 18.094256][ T269] kfree+0x144/0x320 [ 18.094391][ T269] detach_buf_split+0x48d/0x6f0 [ 18.094570][ T269] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 18.094793][ T269] virtio_fs_requests_done_work+0x231/0x890 [ 18.095014][ T269] process_one_work+0xe43/0x1660 [ 18.095191][ T269] worker_thread+0x591/0xcf0 [ 18.095371][ T269] kthread+0x37b/0x600 [ 18.095514][ T269] ret_from_fork+0x243/0x320 [ 18.095694][ T269] ret_from_fork_asm+0x1a/0x30 [ 18.095900][ T269] [ 18.095991][ T269] The buggy address belongs to the object at ffff888001926720 [ 18.095991][ T269] which belongs to the cache kmalloc-96 of size 96 [ 18.096433][ T269] The buggy address is located 0 bytes inside of [ 18.096433][ T269] freed 96-byte region [ffff888001926720, ffff888001926780) [ 18.096884][ T269] [ 18.096974][ T269] The buggy address belongs to the physical page: [ 18.097193][ T269] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888001926720 pfn:0x1926 [ 18.097556][ T269] flags: 0x80000000000200(workingset|node=0|zone=1) [ 18.097787][ T269] page_type: f5(slab) [ 18.097933][ T269] raw: 0080000000000200 ffff888001042340 ffffea0000083090 ffff888001040308 [ 18.098263][ T269] raw: ffff888001926720 000000000010000d 00000000f5000000 0000000000000000 [ 18.098582][ T269] page dumped because: kasan: bad access detected [ 18.098803][ T269] [ 18.098892][ T269] Memory state around the buggy address: [ 18.099067][ T269] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 18.099335][ T269] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.099607][ T269] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 18.099871][ T269] ^ [ 18.100046][ T269] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 18.100314][ T269] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 18.100574][ T269] ================================================================== [ 18.100996][ T269] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr