[ 21.827471][ T316] ================================================================== [ 21.827831][ T316] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 21.828105][ T316] Read of size 1 at addr ffff888001926720 by task modprobe/316 [ 21.828359][ T316] [ 21.828449][ T316] CPU: 2 UID: 0 PID: 316 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 21.828453][ T316] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 21.828456][ T316] Call Trace: [ 21.828457][ T316] [ 21.828459][ T316] dump_stack_lvl+0x82/0xd0 [ 21.828467][ T316] print_address_description.constprop.0+0x2c/0x400 [ 21.828472][ T316] ? emit_its_trampoline+0xa5/0x300 [ 21.828476][ T316] print_report+0xb4/0x270 [ 21.828479][ T316] ? emit_its_trampoline+0xa5/0x300 [ 21.828482][ T316] ? kasan_addr_to_slab+0x25/0x80 [ 21.828487][ T316] ? emit_its_trampoline+0xa5/0x300 [ 21.828490][ T316] kasan_report+0xca/0x100 [ 21.828494][ T316] ? emit_its_trampoline+0xa5/0x300 [ 21.828499][ T316] ? emit_its_trampoline+0xa5/0x300 [ 21.828502][ T316] __kasan_check_byte+0x3a/0x50 [ 21.828505][ T316] krealloc_noprof+0x3d/0x320 [ 21.828510][ T316] ? execmem_alloc+0xc0/0x240 [ 21.828515][ T316] emit_its_trampoline+0xa5/0x300 [ 21.828518][ T316] ? __x86_indirect_paranoid_thunk_rcx+0x2/0x2 [ 21.828524][ T316] ? __pi___x86_indirect_thunk_rax+0x20/0x20 [ 21.828528][ T316] apply_retpolines+0xcf/0x550 [ 21.828533][ T316] ? __pfx_apply_retpolines+0x10/0x10 [ 21.828536][ T316] ? __pfx___mutex_lock+0x10/0x10 [ 21.828547][ T316] module_finalize+0x3d5/0x9d0 [ 21.828552][ T316] ? add_kallsyms+0x7bf/0xf40 [ 21.828558][ T316] ? __pfx_module_finalize+0x10/0x10 [ 21.828562][ T316] ? __pfx_cmp_ex_sort+0x10/0x10 [ 21.828565][ T316] ? __pfx_swap_ex+0x10/0x10 [ 21.828569][ T316] load_module+0x139a/0x2660 [ 21.828577][ T316] ? __pfx_load_module+0x10/0x10 [ 21.828580][ T316] ? kernel_read_file+0x3f5/0x550 [ 21.828587][ T316] ? kernel_read_file+0x3d0/0x550 [ 21.828591][ T316] ? __pfx_kernel_read_file+0x10/0x10 [ 21.828595][ T316] ? add_chain_cache+0x110/0x370 [ 21.828600][ T316] ? init_module_from_file+0xe9/0x150 [ 21.828603][ T316] init_module_from_file+0xe9/0x150 [ 21.828606][ T316] ? __pfx_init_module_from_file+0x10/0x10 [ 21.828614][ T316] ? idempotent_init_module+0x31a/0x620 [ 21.828617][ T316] ? __lock_release+0x5d/0x170 [ 21.828622][ T316] ? do_raw_spin_unlock+0x58/0x220 [ 21.828626][ T316] idempotent_init_module+0x335/0x620 [ 21.828631][ T316] ? __pfx_idempotent_init_module+0x10/0x10 [ 21.828638][ T316] ? cap_capable+0x94/0x230 [ 21.828645][ T316] __x64_sys_finit_module+0xca/0x150 [ 21.828648][ T316] ? do_syscall_64+0x85/0x380 [ 21.828652][ T316] do_syscall_64+0xc1/0x380 [ 21.828656][ T316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 21.828659][ T316] RIP: 0033:0x7f1e8dcc5e5d [ 21.828663][ T316] 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 [ 21.828666][ T316] RSP: 002b:00007fff8f71c408 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 21.828670][ T316] RAX: ffffffffffffffda RBX: 0000557ef557a960 RCX: 00007f1e8dcc5e5d [ 21.828672][ T316] RDX: 0000000000000000 RSI: 0000557ee0e5ba2a RDI: 0000000000000005 [ 21.828674][ T316] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007fff8f71c540 [ 21.828676][ T316] R10: 0000000000000005 R11: 0000000000000246 R12: 0000557ee0e5ba2a [ 21.828678][ T316] R13: 0000557ef557ab10 R14: 0000557ef557adb0 R15: 0000000000000000 [ 21.828684][ T316] [ 21.828685][ T316] [ 21.839378][ T316] Allocated by task 312: [ 21.839511][ T316] kasan_save_stack+0x24/0x50 [ 21.839695][ T316] kasan_save_track+0x14/0x30 [ 21.839872][ T316] __kasan_kmalloc+0x7f/0x90 [ 21.840048][ T316] __kmalloc_noprof+0x1d4/0x470 [ 21.840228][ T316] virtqueue_add_split+0x6a3/0x1920 [ 21.840409][ T316] virtqueue_add_sgs+0x143/0x270 [ 21.840587][ T316] virtio_fs_enqueue_req+0x58c/0xfe0 [ 21.840768][ T316] virtio_fs_send_req+0x13a/0x710 [ 21.840946][ T316] __fuse_simple_request+0x22a/0xb50 [ 21.841125][ T316] fuse_readlink_folio+0x20b/0x400 [ 21.841306][ T316] fuse_get_link+0x12d/0x350 [ 21.841484][ T316] pick_link+0x7a2/0x1160 [ 21.841621][ T316] step_into+0x85a/0xfc0 [ 21.841757][ T316] link_path_walk+0x3c2/0xa10 [ 21.841933][ T316] path_openat+0x14d/0x380 [ 21.842109][ T316] do_filp_open+0x1d7/0x420 [ 21.842286][ T316] do_sys_openat2+0xd4/0x160 [ 21.842464][ T316] __x64_sys_openat+0x122/0x1e0 [ 21.842640][ T316] do_syscall_64+0xc1/0x380 [ 21.842823][ T316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 21.843045][ T316] [ 21.843135][ T316] Freed by task 51: [ 21.843268][ T316] kasan_save_stack+0x24/0x50 [ 21.843448][ T316] kasan_save_track+0x14/0x30 [ 21.843627][ T316] kasan_save_free_info+0x3b/0x60 [ 21.843806][ T316] __kasan_slab_free+0x38/0x50 [ 21.843986][ T316] kfree+0x144/0x320 [ 21.844122][ T316] detach_buf_split+0x48d/0x6f0 [ 21.844299][ T316] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 21.844520][ T316] virtio_fs_requests_done_work+0x231/0x890 [ 21.844742][ T316] process_one_work+0xe43/0x1660 [ 21.844923][ T316] worker_thread+0x591/0xcf0 [ 21.845100][ T316] kthread+0x37b/0x600 [ 21.845235][ T316] ret_from_fork+0x243/0x320 [ 21.845413][ T316] ret_from_fork_asm+0x1a/0x30 [ 21.845593][ T316] [ 21.845682][ T316] The buggy address belongs to the object at ffff888001926720 [ 21.845682][ T316] which belongs to the cache kmalloc-96 of size 96 [ 21.846109][ T316] The buggy address is located 0 bytes inside of [ 21.846109][ T316] freed 96-byte region [ffff888001926720, ffff888001926780) [ 21.846536][ T316] [ 21.846626][ T316] The buggy address belongs to the physical page: [ 21.846844][ T316] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1926 [ 21.847159][ T316] flags: 0x80000000000000(node=0|zone=1) [ 21.847342][ T316] page_type: f5(slab) [ 21.847482][ T316] raw: 0080000000000000 ffff888001042340 ffffea00002ab4d0 ffffea0000164cd0 [ 21.847802][ T316] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 21.848120][ T316] page dumped because: kasan: bad access detected [ 21.848338][ T316] [ 21.848426][ T316] Memory state around the buggy address: [ 21.848596][ T316] ffff888001926600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 21.848853][ T316] ffff888001926680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.849111][ T316] >ffff888001926700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 21.849381][ T316] ^ [ 21.849551][ T316] ffff888001926780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.849806][ T316] ffff888001926800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 21.850165][ T316] ================================================================== [ 21.850624][ T316] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr