[ 12.710717][ T237] ================================================================== [ 12.711077][ T237] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.711336][ T237] Read of size 1 at addr ffff88800192c720 by task modprobe/237 [ 12.711584][ T237] [ 12.711674][ T237] CPU: 0 UID: 0 PID: 237 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.711679][ T237] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.711681][ T237] Call Trace: [ 12.711683][ T237] [ 12.711685][ T237] dump_stack_lvl+0x82/0xd0 [ 12.711696][ T237] print_address_description.constprop.0+0x2c/0x400 [ 12.711704][ T237] ? emit_its_trampoline+0xa5/0x300 [ 12.711707][ T237] print_report+0xb4/0x270 [ 12.711710][ T237] ? emit_its_trampoline+0xa5/0x300 [ 12.711712][ T237] ? kasan_addr_to_slab+0x25/0x80 [ 12.711716][ T237] ? emit_its_trampoline+0xa5/0x300 [ 12.711719][ T237] kasan_report+0xca/0x100 [ 12.711722][ T237] ? emit_its_trampoline+0xa5/0x300 [ 12.711727][ T237] ? emit_its_trampoline+0xa5/0x300 [ 12.711729][ T237] __kasan_check_byte+0x3a/0x50 [ 12.711733][ T237] krealloc_noprof+0x3d/0x320 [ 12.711737][ T237] ? execmem_alloc+0xc0/0x240 [ 12.711743][ T237] emit_its_trampoline+0xa5/0x300 [ 12.711746][ T237] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.711754][ T237] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.711758][ T237] apply_retpolines+0xcf/0x550 [ 12.711763][ T237] ? __pfx_apply_retpolines+0x10/0x10 [ 12.711766][ T237] ? __pfx___mutex_lock+0x10/0x10 [ 12.711776][ T237] module_finalize+0x3d5/0x9d0 [ 12.711784][ T237] ? add_kallsyms+0x7bf/0xf40 [ 12.711790][ T237] ? __pfx_module_finalize+0x10/0x10 [ 12.711794][ T237] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.711798][ T237] ? __pfx_swap_ex+0x10/0x10 [ 12.711802][ T237] load_module+0x139a/0x2660 [ 12.711811][ T237] ? __pfx_load_module+0x10/0x10 [ 12.711815][ T237] ? kernel_read_file+0x3f5/0x550 [ 12.711821][ T237] ? kernel_read_file+0x3d0/0x550 [ 12.711825][ T237] ? __pfx_kernel_read_file+0x10/0x10 [ 12.711828][ T237] ? add_chain_cache+0x110/0x370 [ 12.711835][ T237] ? init_module_from_file+0xe9/0x150 [ 12.711839][ T237] init_module_from_file+0xe9/0x150 [ 12.711842][ T237] ? __pfx_init_module_from_file+0x10/0x10 [ 12.711851][ T237] ? idempotent_init_module+0x31a/0x620 [ 12.711855][ T237] ? __lock_release+0x5d/0x170 [ 12.711860][ T237] ? do_raw_spin_unlock+0x58/0x220 [ 12.711865][ T237] idempotent_init_module+0x335/0x620 [ 12.711869][ T237] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.711877][ T237] ? cap_capable+0x94/0x230 [ 12.711886][ T237] __x64_sys_finit_module+0xca/0x150 [ 12.711889][ T237] ? do_syscall_64+0x85/0x380 [ 12.711893][ T237] do_syscall_64+0xc1/0x380 [ 12.711897][ T237] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.711901][ T237] RIP: 0033:0x7f67574c7e5d [ 12.711905][ T237] 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 [ 12.711908][ T237] RSP: 002b:00007ffe2601bbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.711912][ T237] RAX: ffffffffffffffda RBX: 00005594d2562960 RCX: 00007f67574c7e5d [ 12.711915][ T237] RDX: 0000000000000000 RSI: 0000559492cbfa2a RDI: 0000000000000005 [ 12.711917][ T237] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffe2601bd20 [ 12.711919][ T237] R10: 0000000000000005 R11: 0000000000000246 R12: 0000559492cbfa2a [ 12.711921][ T237] R13: 00005594d2562b10 R14: 00005594d2562db0 R15: 0000000000000000 [ 12.711927][ T237] [ 12.711929][ T237] [ 12.722267][ T237] Allocated by task 215: [ 12.722398][ T237] kasan_save_stack+0x24/0x50 [ 12.722574][ T237] kasan_save_track+0x14/0x30 [ 12.722744][ T237] __kasan_kmalloc+0x7f/0x90 [ 12.722913][ T237] __kmalloc_noprof+0x1d4/0x470 [ 12.723083][ T237] virtqueue_add_split+0x6a3/0x1920 [ 12.723259][ T237] virtqueue_add_sgs+0x143/0x270 [ 12.723429][ T237] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.723602][ T237] virtio_fs_send_req+0x13a/0x710 [ 12.723772][ T237] __fuse_simple_request+0x22a/0xb50 [ 12.723945][ T237] fuse_readlink_folio+0x20b/0x400 [ 12.724115][ T237] fuse_get_link+0x12d/0x350 [ 12.724285][ T237] pick_link+0x7a2/0x1160 [ 12.724416][ T237] step_into+0x85a/0xfc0 [ 12.724551][ T237] link_path_walk+0x3c2/0xa10 [ 12.724720][ T237] path_openat+0x14d/0x380 [ 12.724893][ T237] do_filp_open+0x1d7/0x420 [ 12.725063][ T237] do_sys_openat2+0xd4/0x160 [ 12.725235][ T237] __x64_sys_openat+0x122/0x1e0 [ 12.725405][ T237] do_syscall_64+0xc1/0x380 [ 12.725574][ T237] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.725784][ T237] [ 12.725871][ T237] Freed by task 62: [ 12.725997][ T237] kasan_save_stack+0x24/0x50 [ 12.726172][ T237] kasan_save_track+0x14/0x30 [ 12.726343][ T237] kasan_save_free_info+0x3b/0x60 [ 12.726526][ T237] __kasan_slab_free+0x38/0x50 [ 12.726696][ T237] kfree+0x144/0x320 [ 12.726824][ T237] detach_buf_split+0x48d/0x6f0 [ 12.726994][ T237] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.727205][ T237] virtio_fs_requests_done_work+0x231/0x890 [ 12.727416][ T237] process_one_work+0xe43/0x1660 [ 12.727593][ T237] worker_thread+0x591/0xcf0 [ 12.727762][ T237] kthread+0x37b/0x600 [ 12.727893][ T237] ret_from_fork+0x243/0x320 [ 12.728067][ T237] ret_from_fork_asm+0x1a/0x30 [ 12.728240][ T237] [ 12.728325][ T237] The buggy address belongs to the object at ffff88800192c720 [ 12.728325][ T237] which belongs to the cache kmalloc-96 of size 96 [ 12.728736][ T237] The buggy address is located 0 bytes inside of [ 12.728736][ T237] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.729145][ T237] [ 12.729233][ T237] The buggy address belongs to the physical page: [ 12.729440][ T237] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800192ca20 pfn:0x192c [ 12.729785][ T237] flags: 0x80000000000200(workingset|node=0|zone=1) [ 12.730009][ T237] page_type: f5(slab) [ 12.730144][ T237] raw: 0080000000000200 ffff888001042340 ffffea00000a6050 ffffea0000252110 [ 12.730455][ T237] raw: ffff88800192ca20 000000000010000e 00000000f5000000 0000000000000000 [ 12.730757][ T237] page dumped because: kasan: bad access detected [ 12.730967][ T237] [ 12.731050][ T237] Memory state around the buggy address: [ 12.731218][ T237] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.731467][ T237] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.731712][ T237] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.731958][ T237] ^ [ 12.732126][ T237] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.732371][ T237] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.732617][ T237] ================================================================== [ 12.732951][ T237] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr