[ 30.523626][ T387] ================================================================== [ 30.523989][ T387] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 30.524303][ T387] Read of size 1 at addr ffff888001926720 by task modprobe/387 [ 30.524609][ T387] [ 30.524718][ T387] CPU: 0 UID: 0 PID: 387 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 30.524723][ T387] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 30.524726][ T387] Call Trace: [ 30.524728][ T387] [ 30.524730][ T387] dump_stack_lvl+0x82/0xd0 [ 30.524740][ T387] print_address_description.constprop.0+0x2c/0x400 [ 30.524747][ T387] ? emit_its_trampoline+0xa5/0x300 [ 30.524751][ T387] print_report+0xb4/0x270 [ 30.524753][ T387] ? emit_its_trampoline+0xa5/0x300 [ 30.524757][ T387] ? kasan_addr_to_slab+0x25/0x80 [ 30.524762][ T387] ? emit_its_trampoline+0xa5/0x300 [ 30.524765][ T387] kasan_report+0xca/0x100 [ 30.524769][ T387] ? emit_its_trampoline+0xa5/0x300 [ 30.524775][ T387] ? emit_its_trampoline+0xa5/0x300 [ 30.524778][ T387] __kasan_check_byte+0x3a/0x50 [ 30.524781][ T387] krealloc_noprof+0x3d/0x320 [ 30.524787][ T387] ? execmem_alloc+0xc0/0x240 [ 30.524793][ T387] emit_its_trampoline+0xa5/0x300 [ 30.524796][ T387] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 30.524805][ T387] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 30.524809][ T387] apply_retpolines+0xcf/0x550 [ 30.524813][ T387] ? __pfx_apply_retpolines+0x10/0x10 [ 30.524817][ T387] ? __pfx___mutex_lock+0x10/0x10 [ 30.524828][ T387] module_finalize+0x3d5/0x9d0 [ 30.524834][ T387] ? add_kallsyms+0x7bf/0xf40 [ 30.524841][ T387] ? __pfx_module_finalize+0x10/0x10 [ 30.524845][ T387] ? __pfx_cmp_ex_sort+0x10/0x10 [ 30.524848][ T387] ? __pfx_swap_ex+0x10/0x10 [ 30.524853][ T387] load_module+0x139a/0x2660 [ 30.524861][ T387] ? __pfx_load_module+0x10/0x10 [ 30.524864][ T387] ? kernel_read_file+0x3f5/0x550 [ 30.524873][ T387] ? kernel_read_file+0x3d0/0x550 [ 30.524877][ T387] ? __pfx_kernel_read_file+0x10/0x10 [ 30.524881][ T387] ? add_chain_cache+0x110/0x370 [ 30.524887][ T387] ? init_module_from_file+0xe9/0x150 [ 30.524890][ T387] init_module_from_file+0xe9/0x150 [ 30.524894][ T387] ? __pfx_init_module_from_file+0x10/0x10 [ 30.524903][ T387] ? idempotent_init_module+0x31a/0x620 [ 30.524906][ T387] ? __lock_release+0x5d/0x170 [ 30.524911][ T387] ? do_raw_spin_unlock+0x58/0x220 [ 30.524915][ T387] idempotent_init_module+0x335/0x620 [ 30.524920][ T387] ? __pfx_idempotent_init_module+0x10/0x10 [ 30.524927][ T387] ? cap_capable+0x94/0x230 [ 30.524935][ T387] __x64_sys_finit_module+0xca/0x150 [ 30.524939][ T387] ? do_syscall_64+0x85/0x380 [ 30.524944][ T387] do_syscall_64+0xc1/0x380 [ 30.524947][ T387] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 30.524951][ T387] RIP: 0033:0x7fd07965ee5d [ 30.524956][ T387] 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 [ 30.524959][ T387] RSP: 002b:00007ffe671803a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 30.524963][ T387] RAX: ffffffffffffffda RBX: 0000560d0c500960 RCX: 00007fd07965ee5d [ 30.524966][ T387] RDX: 0000000000000000 RSI: 0000560d0a73fa2a RDI: 0000000000000005 [ 30.524968][ T387] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe671804e0 [ 30.524970][ T387] R10: 0000000000000005 R11: 0000000000000246 R12: 0000560d0a73fa2a [ 30.524972][ T387] R13: 0000560d0c500b10 R14: 0000560d0c500db0 R15: 0000000000000000 [ 30.524978][ T387] [ 30.524980][ T387] [ 30.537705][ T387] Allocated by task 357: [ 30.537862][ T387] kasan_save_stack+0x24/0x50 [ 30.538083][ T387] kasan_save_track+0x14/0x30 [ 30.538295][ T387] __kasan_kmalloc+0x7f/0x90 [ 30.538507][ T387] __kmalloc_noprof+0x1d4/0x470 [ 30.538719][ T387] ovl_cache_entry_new+0x44/0x580 [ 30.538936][ T387] ovl_fill_merge+0x22c/0xa20 [ 30.539146][ T387] fuse_readdir_uncached+0x9a8/0xc90 [ 30.539367][ T387] iterate_dir+0x184/0x530 [ 30.539578][ T387] ovl_dir_read_merged+0x32e/0x4e0 [ 30.539789][ T387] ovl_iterate+0x772/0xf10 [ 30.539997][ T387] wrap_directory_iterator+0x90/0xd0 [ 30.540213][ T387] iterate_dir+0x184/0x530 [ 30.540422][ T387] __x64_sys_getdents64+0x12e/0x230 [ 30.540646][ T387] do_syscall_64+0xc1/0x380 [ 30.540861][ T387] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 30.541125][ T387] [ 30.541232][ T387] Freed by task 357: [ 30.541388][ T387] kasan_save_stack+0x24/0x50 [ 30.541599][ T387] kasan_save_track+0x14/0x30 [ 30.541811][ T387] kasan_save_free_info+0x3b/0x60 [ 30.542026][ T387] __kasan_slab_free+0x38/0x50 [ 30.542238][ T387] kfree+0x144/0x320 [ 30.542398][ T387] ovl_cache_put.isra.0+0xd5/0x190 [ 30.542612][ T387] ovl_dir_release+0x97/0x140 [ 30.542824][ T387] __fput+0x35c/0xa80 [ 30.542987][ T387] fput_close_sync+0xdd/0x190 [ 30.543197][ T387] __x64_sys_close+0x7d/0xd0 [ 30.543408][ T387] do_syscall_64+0xc1/0x380 [ 30.543618][ T387] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 30.543884][ T387] [ 30.543993][ T387] The buggy address belongs to the object at ffff888001926720 [ 30.543993][ T387] which belongs to the cache kmalloc-96 of size 96 [ 30.544506][ T387] The buggy address is located 0 bytes inside of [ 30.544506][ T387] freed 96-byte region [ffff888001926720, ffff888001926780) [ 30.545026][ T387] [ 30.545133][ T387] The buggy address belongs to the physical page: [ 30.545395][ T387] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888001926b20 pfn:0x1926 [ 30.545822][ T387] flags: 0x80000000000200(workingset|node=0|zone=1) [ 30.546092][ T387] page_type: f5(slab) [ 30.546259][ T387] raw: 0080000000000200 ffff888001042340 ffffea000007da90 ffffea0000047050 [ 30.546636][ T387] raw: ffff888001926b20 000000000010000d 00000000f5000000 0000000000000000 [ 30.547010][ T387] page dumped because: kasan: bad access detected [ 30.547272][ T387] [ 30.547377][ T387] Memory state around the buggy address: [ 30.547581][ T387] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 30.547899][ T387] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 30.548209][ T387] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 30.548513][ T387] ^ [ 30.548718][ T387] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 30.549024][ T387] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 30.549333][ T387] ================================================================== [ 30.549807][ T387] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr