[ 19.043510][ T265] ================================================================== [ 19.043859][ T265] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 19.044199][ T265] Read of size 1 at addr ffff888001926720 by task modprobe/265 [ 19.044482][ T265] [ 19.044585][ T265] CPU: 3 UID: 0 PID: 265 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 19.044591][ T265] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.044594][ T265] Call Trace: [ 19.044596][ T265] [ 19.044598][ T265] dump_stack_lvl+0x82/0xd0 [ 19.044609][ T265] print_address_description.constprop.0+0x2c/0x400 [ 19.044616][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.044620][ T265] print_report+0xb4/0x270 [ 19.044623][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.044626][ T265] ? kasan_addr_to_slab+0x25/0x80 [ 19.044632][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.044635][ T265] kasan_report+0xca/0x100 [ 19.044639][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.044645][ T265] ? emit_its_trampoline+0xa5/0x300 [ 19.044648][ T265] __kasan_check_byte+0x3a/0x50 [ 19.044651][ T265] krealloc_noprof+0x3d/0x320 [ 19.044657][ T265] ? execmem_alloc+0xc0/0x240 [ 19.044663][ T265] emit_its_trampoline+0xa5/0x300 [ 19.044666][ T265] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 19.044673][ T265] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 19.044677][ T265] apply_retpolines+0xcf/0x550 [ 19.044682][ T265] ? __pfx_apply_retpolines+0x10/0x10 [ 19.044686][ T265] ? __pfx___mutex_lock+0x10/0x10 [ 19.044697][ T265] module_finalize+0x3d5/0x9d0 [ 19.044703][ T265] ? add_kallsyms+0x7bf/0xf40 [ 19.044709][ T265] ? __pfx_module_finalize+0x10/0x10 [ 19.044713][ T265] ? __pfx_cmp_ex_sort+0x10/0x10 [ 19.044716][ T265] ? __pfx_swap_ex+0x10/0x10 [ 19.044721][ T265] load_module+0x139a/0x2660 [ 19.044728][ T265] ? __pfx_load_module+0x10/0x10 [ 19.044731][ T265] ? kernel_read_file+0x3f5/0x550 [ 19.044740][ T265] ? kernel_read_file+0x3d0/0x550 [ 19.044744][ T265] ? __pfx_kernel_read_file+0x10/0x10 [ 19.044748][ T265] ? add_chain_cache+0x110/0x370 [ 19.044754][ T265] ? init_module_from_file+0xe9/0x150 [ 19.044757][ T265] init_module_from_file+0xe9/0x150 [ 19.044760][ T265] ? __pfx_init_module_from_file+0x10/0x10 [ 19.044769][ T265] ? idempotent_init_module+0x31a/0x620 [ 19.044772][ T265] ? __lock_release+0x5d/0x170 [ 19.044777][ T265] ? do_raw_spin_unlock+0x58/0x220 [ 19.044782][ T265] idempotent_init_module+0x335/0x620 [ 19.044787][ T265] ? __pfx_idempotent_init_module+0x10/0x10 [ 19.044794][ T265] ? cap_capable+0x94/0x230 [ 19.044802][ T265] __x64_sys_finit_module+0xca/0x150 [ 19.044806][ T265] ? do_syscall_64+0x85/0x380 [ 19.044811][ T265] do_syscall_64+0xc1/0x380 [ 19.044815][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.044819][ T265] RIP: 0033:0x7fa437dd0e5d [ 19.044825][ T265] 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 [ 19.044828][ T265] RSP: 002b:00007ffda7f64ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 19.044832][ T265] RAX: ffffffffffffffda RBX: 0000558993685960 RCX: 00007fa437dd0e5d [ 19.044835][ T265] RDX: 0000000000000000 RSI: 0000558968810a2a RDI: 0000000000000005 [ 19.044837][ T265] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffda7f64fe0 [ 19.044839][ T265] R10: 0000000000000005 R11: 0000000000000246 R12: 0000558968810a2a [ 19.044841][ T265] R13: 0000558993685b10 R14: 0000558993685db0 R15: 0000000000000000 [ 19.044848][ T265] [ 19.044849][ T265] [ 19.056314][ T265] Allocated by task 265: [ 19.056456][ T265] kasan_save_stack+0x24/0x50 [ 19.056657][ T265] kasan_save_track+0x14/0x30 [ 19.056840][ T265] __kasan_kmalloc+0x7f/0x90 [ 19.057032][ T265] __kmalloc_noprof+0x1d4/0x470 [ 19.057226][ T265] virtqueue_add_split+0x6a3/0x1920 [ 19.057420][ T265] virtqueue_add_sgs+0x143/0x270 [ 19.057626][ T265] virtio_fs_enqueue_req+0x58c/0xfe0 [ 19.057830][ T265] virtio_fs_send_req+0x13a/0x710 [ 19.058019][ T265] __fuse_simple_request+0x22a/0xb50 [ 19.058207][ T265] fuse_readlink_folio+0x20b/0x400 [ 19.058396][ T265] fuse_get_link+0x12d/0x350 [ 19.058593][ T265] pick_link+0x7a2/0x1160 [ 19.058733][ T265] step_into+0x85a/0xfc0 [ 19.058878][ T265] link_path_walk+0x3c2/0xa10 [ 19.059062][ T265] path_lookupat+0x117/0x630 [ 19.059253][ T265] filename_lookup+0x1c4/0x470 [ 19.059448][ T265] vfs_statx+0xaa/0x2e0 [ 19.059597][ T265] vfs_fstatat+0x68/0xa0 [ 19.059748][ T265] __do_sys_newfstatat+0x6a/0xc0 [ 19.059938][ T265] do_syscall_64+0xc1/0x380 [ 19.060139][ T265] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 19.060388][ T265] [ 19.060491][ T265] Freed by task 51: [ 19.060639][ T265] kasan_save_stack+0x24/0x50 [ 19.060863][ T265] kasan_save_track+0x14/0x30 [ 19.061062][ T265] kasan_save_free_info+0x3b/0x60 [ 19.061261][ T265] __kasan_slab_free+0x38/0x50 [ 19.061462][ T265] kfree+0x144/0x320 [ 19.061616][ T265] detach_buf_split+0x48d/0x6f0 [ 19.061815][ T265] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 19.062069][ T265] virtio_fs_requests_done_work+0x231/0x890 [ 19.062320][ T265] process_one_work+0xe43/0x1660 [ 19.062526][ T265] worker_thread+0x591/0xcf0 [ 19.062736][ T265] kthread+0x37b/0x600 [ 19.062878][ T265] ret_from_fork+0x243/0x320 [ 19.063062][ T265] ret_from_fork_asm+0x1a/0x30 [ 19.063257][ T265] [ 19.063356][ T265] The buggy address belongs to the object at ffff888001926720 [ 19.063356][ T265] which belongs to the cache kmalloc-96 of size 96 [ 19.063859][ T265] The buggy address is located 0 bytes inside of [ 19.063859][ T265] freed 96-byte region [ffff888001926720, ffff888001926780) [ 19.064329][ T265] [ 19.064427][ T265] The buggy address belongs to the physical page: [ 19.064665][ T265] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 19.065013][ T265] flags: 0x80000000000000(node=0|zone=1) [ 19.065221][ T265] page_type: f5(slab) [ 19.065376][ T265] raw: 0080000000000000 ffff888001042340 ffffea0000162610 ffffea00002ad150 [ 19.065729][ T265] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 19.066075][ T265] page dumped because: kasan: bad access detected [ 19.066317][ T265] [ 19.066412][ T265] Memory state around the buggy address: [ 19.066608][ T265] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 19.066897][ T265] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.067183][ T265] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 19.067468][ T265] ^ [ 19.067667][ T265] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 19.067968][ T265] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 19.068248][ T265] ================================================================== [ 19.068551][ T265] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr