[ 12.601394][ T231] ================================================================== [ 12.601743][ T231] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.601998][ T231] Read of size 1 at addr ffff88800192c720 by task modprobe/231 [ 12.602249][ T231] [ 12.602338][ T231] CPU: 1 UID: 0 PID: 231 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.602344][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.602346][ T231] Call Trace: [ 12.602348][ T231] [ 12.602350][ T231] dump_stack_lvl+0x82/0xd0 [ 12.602358][ T231] print_address_description.constprop.0+0x2c/0x400 [ 12.602365][ T231] ? emit_its_trampoline+0xa5/0x300 [ 12.602368][ T231] print_report+0xb4/0x270 [ 12.602371][ T231] ? emit_its_trampoline+0xa5/0x300 [ 12.602373][ T231] ? kasan_addr_to_slab+0x25/0x80 [ 12.602376][ T231] ? emit_its_trampoline+0xa5/0x300 [ 12.602379][ T231] kasan_report+0xca/0x100 [ 12.602382][ T231] ? emit_its_trampoline+0xa5/0x300 [ 12.602387][ T231] ? emit_its_trampoline+0xa5/0x300 [ 12.602389][ T231] __kasan_check_byte+0x3a/0x50 [ 12.602393][ T231] krealloc_noprof+0x3d/0x320 [ 12.602396][ T231] ? execmem_alloc+0xc0/0x240 [ 12.602401][ T231] emit_its_trampoline+0xa5/0x300 [ 12.602404][ T231] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.602410][ T231] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.602414][ T231] apply_retpolines+0xcf/0x550 [ 12.602418][ T231] ? __pfx_apply_retpolines+0x10/0x10 [ 12.602421][ T231] ? __pfx___mutex_lock+0x10/0x10 [ 12.602431][ T231] module_finalize+0x3d5/0x9d0 [ 12.602438][ T231] ? add_kallsyms+0x7bf/0xf40 [ 12.602442][ T231] ? __pfx_module_finalize+0x10/0x10 [ 12.602447][ T231] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.602450][ T231] ? __pfx_swap_ex+0x10/0x10 [ 12.602454][ T231] load_module+0x139a/0x2660 [ 12.602463][ T231] ? __pfx_load_module+0x10/0x10 [ 12.602466][ T231] ? kernel_read_file+0x3f5/0x550 [ 12.602472][ T231] ? kernel_read_file+0x3d0/0x550 [ 12.602475][ T231] ? __pfx_kernel_read_file+0x10/0x10 [ 12.602478][ T231] ? add_chain_cache+0x110/0x370 [ 12.602484][ T231] ? init_module_from_file+0xe9/0x150 [ 12.602488][ T231] init_module_from_file+0xe9/0x150 [ 12.602491][ T231] ? __pfx_init_module_from_file+0x10/0x10 [ 12.602500][ T231] ? idempotent_init_module+0x31a/0x620 [ 12.602503][ T231] ? __lock_release+0x5d/0x170 [ 12.602509][ T231] ? do_raw_spin_unlock+0x58/0x220 [ 12.602513][ T231] idempotent_init_module+0x335/0x620 [ 12.602517][ T231] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.602525][ T231] ? cap_capable+0x94/0x230 [ 12.602532][ T231] __x64_sys_finit_module+0xca/0x150 [ 12.602535][ T231] ? do_syscall_64+0x85/0x380 [ 12.602539][ T231] do_syscall_64+0xc1/0x380 [ 12.602542][ T231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.602546][ T231] RIP: 0033:0x7f10d6edfe5d [ 12.602550][ T231] 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 [ 12.602553][ T231] RSP: 002b:00007ffd2f0178a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.602556][ T231] RAX: ffffffffffffffda RBX: 0000562158184960 RCX: 00007f10d6edfe5d [ 12.602559][ T231] RDX: 0000000000000000 RSI: 0000562139b0fa2a RDI: 0000000000000005 [ 12.602561][ T231] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffd2f0179e0 [ 12.602563][ T231] R10: 0000000000000005 R11: 0000000000000246 R12: 0000562139b0fa2a [ 12.602564][ T231] R13: 0000562158184b10 R14: 0000562158184db0 R15: 0000000000000000 [ 12.602570][ T231] [ 12.602572][ T231] [ 12.612951][ T231] Allocated by task 204: [ 12.613081][ T231] kasan_save_stack+0x24/0x50 [ 12.613259][ T231] kasan_save_track+0x14/0x30 [ 12.613431][ T231] __kasan_kmalloc+0x7f/0x90 [ 12.613602][ T231] __kmalloc_noprof+0x1d4/0x470 [ 12.613780][ T231] virtqueue_add_split+0x6a3/0x1920 [ 12.613955][ T231] virtqueue_add_sgs+0x143/0x270 [ 12.614125][ T231] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.614307][ T231] virtio_fs_send_req+0x13a/0x710 [ 12.614480][ T231] __fuse_simple_request+0x22a/0xb50 [ 12.614654][ T231] fuse_readlink_folio+0x20b/0x400 [ 12.614831][ T231] fuse_get_link+0x12d/0x350 [ 12.615003][ T231] pick_link+0x7a2/0x1160 [ 12.615134][ T231] step_into+0x85a/0xfc0 [ 12.615264][ T231] link_path_walk+0x3c2/0xa10 [ 12.615435][ T231] path_openat+0x14d/0x380 [ 12.615607][ T231] do_filp_open+0x1d7/0x420 [ 12.615779][ T231] do_sys_openat2+0xd4/0x160 [ 12.615953][ T231] __x64_sys_openat+0x122/0x1e0 [ 12.616128][ T231] do_syscall_64+0xc1/0x380 [ 12.616299][ T231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.616513][ T231] [ 12.616599][ T231] Freed by task 56: [ 12.616725][ T231] kasan_save_stack+0x24/0x50 [ 12.616897][ T231] kasan_save_track+0x14/0x30 [ 12.617067][ T231] kasan_save_free_info+0x3b/0x60 [ 12.617239][ T231] __kasan_slab_free+0x38/0x50 [ 12.617420][ T231] kfree+0x144/0x320 [ 12.617556][ T231] detach_buf_split+0x48d/0x6f0 [ 12.617726][ T231] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.617941][ T231] virtio_fs_requests_done_work+0x231/0x890 [ 12.618153][ T231] process_one_work+0xe43/0x1660 [ 12.618326][ T231] worker_thread+0x591/0xcf0 [ 12.618498][ T231] kthread+0x37b/0x600 [ 12.618628][ T231] ret_from_fork+0x243/0x320 [ 12.618803][ T231] ret_from_fork_asm+0x1a/0x30 [ 12.618976][ T231] [ 12.619063][ T231] The buggy address belongs to the object at ffff88800192c720 [ 12.619063][ T231] which belongs to the cache kmalloc-96 of size 96 [ 12.619473][ T231] The buggy address is located 0 bytes inside of [ 12.619473][ T231] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.619889][ T231] [ 12.619974][ T231] The buggy address belongs to the physical page: [ 12.620181][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 12.620485][ T231] flags: 0x80000000000000(node=0|zone=1) [ 12.620664][ T231] page_type: f5(slab) [ 12.620799][ T231] raw: 0080000000000000 ffff888001042340 ffffea0000132ed0 ffffea00000951d0 [ 12.621110][ T231] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 12.621417][ T231] page dumped because: kasan: bad access detected [ 12.621625][ T231] [ 12.621709][ T231] Memory state around the buggy address: [ 12.621873][ T231] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.622125][ T231] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.622375][ T231] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.622624][ T231] ^ [ 12.622789][ T231] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.623036][ T231] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.623287][ T231] ================================================================== [ 12.623550][ T231] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr