[ 12.934951][ T239] ================================================================== [ 12.935262][ T239] BUG: KASAN: slab-use-after-free in emit_its_trampoline+0xa5/0x300 [ 12.935536][ T239] Read of size 1 at addr ffff88800192c720 by task modprobe/239 [ 12.935805][ T239] [ 12.935899][ T239] CPU: 1 UID: 0 PID: 239 Comm: modprobe Not tainted 6.16.0-rc2-virtme #1 PREEMPT(full) [ 12.935904][ T239] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.935906][ T239] Call Trace: [ 12.935908][ T239] [ 12.935910][ T239] dump_stack_lvl+0x82/0xd0 [ 12.935918][ T239] print_address_description.constprop.0+0x2c/0x400 [ 12.935924][ T239] ? emit_its_trampoline+0xa5/0x300 [ 12.935927][ T239] print_report+0xb4/0x270 [ 12.935930][ T239] ? emit_its_trampoline+0xa5/0x300 [ 12.935932][ T239] ? kasan_addr_to_slab+0x25/0x80 [ 12.935936][ T239] ? emit_its_trampoline+0xa5/0x300 [ 12.935938][ T239] kasan_report+0xca/0x100 [ 12.935941][ T239] ? emit_its_trampoline+0xa5/0x300 [ 12.935946][ T239] ? emit_its_trampoline+0xa5/0x300 [ 12.935948][ T239] __kasan_check_byte+0x3a/0x50 [ 12.935952][ T239] krealloc_noprof+0x3d/0x320 [ 12.935955][ T239] ? execmem_alloc+0xc0/0x240 [ 12.935960][ T239] emit_its_trampoline+0xa5/0x300 [ 12.935963][ T239] ? __x86_indirect_paranoid_thunk_rbx+0x2/0x2 [ 12.935969][ T239] ? __pi___x86_indirect_thunk_rdx+0x20/0x20 [ 12.935973][ T239] apply_retpolines+0xcf/0x550 [ 12.935977][ T239] ? __pfx_apply_retpolines+0x10/0x10 [ 12.935980][ T239] ? __pfx___mutex_lock+0x10/0x10 [ 12.935990][ T239] module_finalize+0x3d5/0x9d0 [ 12.935997][ T239] ? add_kallsyms+0x7bf/0xf40 [ 12.936001][ T239] ? __pfx_module_finalize+0x10/0x10 [ 12.936006][ T239] ? __pfx_cmp_ex_sort+0x10/0x10 [ 12.936009][ T239] ? __pfx_swap_ex+0x10/0x10 [ 12.936013][ T239] load_module+0x139a/0x2660 [ 12.936021][ T239] ? __pfx_load_module+0x10/0x10 [ 12.936025][ T239] ? kernel_read_file+0x3f5/0x550 [ 12.936030][ T239] ? kernel_read_file+0x3d0/0x550 [ 12.936033][ T239] ? __pfx_kernel_read_file+0x10/0x10 [ 12.936036][ T239] ? add_chain_cache+0x110/0x370 [ 12.936043][ T239] ? init_module_from_file+0xe9/0x150 [ 12.936046][ T239] init_module_from_file+0xe9/0x150 [ 12.936050][ T239] ? __pfx_init_module_from_file+0x10/0x10 [ 12.936058][ T239] ? idempotent_init_module+0x31a/0x620 [ 12.936061][ T239] ? __lock_release+0x5d/0x170 [ 12.936067][ T239] ? do_raw_spin_unlock+0x58/0x220 [ 12.936071][ T239] idempotent_init_module+0x335/0x620 [ 12.936075][ T239] ? __pfx_idempotent_init_module+0x10/0x10 [ 12.936083][ T239] ? cap_capable+0x94/0x230 [ 12.936089][ T239] __x64_sys_finit_module+0xca/0x150 [ 12.936092][ T239] ? do_syscall_64+0x85/0x380 [ 12.936096][ T239] do_syscall_64+0xc1/0x380 [ 12.936099][ T239] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.936103][ T239] RIP: 0033:0x7fabdfa99e5d [ 12.936107][ T239] 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 [ 12.936110][ T239] RSP: 002b:00007ffde0615228 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 12.936114][ T239] RAX: ffffffffffffffda RBX: 00005592f63e4960 RCX: 00007fabdfa99e5d [ 12.936116][ T239] RDX: 0000000000000000 RSI: 00005592e3b12a2a RDI: 0000000000000005 [ 12.936118][ T239] RBP: 0000000000040000 R08: 0000000000000000 R09: 00007ffde0615360 [ 12.936119][ T239] R10: 0000000000000005 R11: 0000000000000246 R12: 00005592e3b12a2a [ 12.936121][ T239] R13: 00005592f63e4b10 R14: 00005592f63e4db0 R15: 0000000000000000 [ 12.936127][ T239] [ 12.936129][ T239] [ 12.947222][ T239] Allocated by task 220: [ 12.947360][ T239] kasan_save_stack+0x24/0x50 [ 12.947544][ T239] kasan_save_track+0x14/0x30 [ 12.947729][ T239] __kasan_kmalloc+0x7f/0x90 [ 12.947911][ T239] __kmalloc_noprof+0x1d4/0x470 [ 12.948093][ T239] virtqueue_add_split+0x6a3/0x1920 [ 12.948277][ T239] virtqueue_add_sgs+0x143/0x270 [ 12.948460][ T239] virtio_fs_enqueue_req+0x58c/0xfe0 [ 12.948655][ T239] virtio_fs_send_req+0x13a/0x710 [ 12.948841][ T239] __fuse_simple_request+0x22a/0xb50 [ 12.949029][ T239] fuse_readlink_folio+0x20b/0x400 [ 12.949217][ T239] fuse_get_link+0x12d/0x350 [ 12.949403][ T239] pick_link+0x7a2/0x1160 [ 12.949548][ T239] step_into+0x85a/0xfc0 [ 12.949689][ T239] link_path_walk+0x3c2/0xa10 [ 12.949879][ T239] path_openat+0x14d/0x380 [ 12.950065][ T239] do_filp_open+0x1d7/0x420 [ 12.950247][ T239] do_sys_openat2+0xd4/0x160 [ 12.950428][ T239] __x64_sys_openat+0x122/0x1e0 [ 12.950610][ T239] do_syscall_64+0xc1/0x380 [ 12.950793][ T239] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.951018][ T239] [ 12.951108][ T239] Freed by task 67: [ 12.951242][ T239] kasan_save_stack+0x24/0x50 [ 12.951430][ T239] kasan_save_track+0x14/0x30 [ 12.951607][ T239] kasan_save_free_info+0x3b/0x60 [ 12.951789][ T239] __kasan_slab_free+0x38/0x50 [ 12.951971][ T239] kfree+0x144/0x320 [ 12.952106][ T239] detach_buf_split+0x48d/0x6f0 [ 12.952284][ T239] virtqueue_get_buf_ctx_split+0x294/0x7f0 [ 12.952510][ T239] virtio_fs_requests_done_work+0x231/0x890 [ 12.952733][ T239] process_one_work+0xe43/0x1660 [ 12.952920][ T239] worker_thread+0x591/0xcf0 [ 12.953101][ T239] kthread+0x37b/0x600 [ 12.953238][ T239] ret_from_fork+0x243/0x320 [ 12.953420][ T239] ret_from_fork_asm+0x1a/0x30 [ 12.953599][ T239] [ 12.953689][ T239] The buggy address belongs to the object at ffff88800192c720 [ 12.953689][ T239] which belongs to the cache kmalloc-96 of size 96 [ 12.954126][ T239] The buggy address is located 0 bytes inside of [ 12.954126][ T239] freed 96-byte region [ffff88800192c720, ffff88800192c780) [ 12.954574][ T239] [ 12.954666][ T239] The buggy address belongs to the physical page: [ 12.954884][ T239] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x192c [ 12.955203][ T239] flags: 0x80000000000000(node=0|zone=1) [ 12.955393][ T239] page_type: f5(slab) [ 12.955534][ T239] raw: 0080000000000000 ffff888001042340 ffffea00002a8b10 ffffea000023c6d0 [ 12.955858][ T239] raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 [ 12.956181][ T239] page dumped because: kasan: bad access detected [ 12.956401][ T239] [ 12.956491][ T239] Memory state around the buggy address: [ 12.956671][ T239] ffff88800192c600: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc [ 12.956936][ T239] ffff88800192c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.957199][ T239] >ffff88800192c700: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb [ 12.957463][ T239] ^ [ 12.957640][ T239] ffff88800192c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.957915][ T239] ffff88800192c800: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 fc [ 12.958180][ T239] ================================================================== [ 12.958454][ T239] Disabling lock debugging due to kernel taint WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr WAIT TIMEOUT stderr