================================================================== BUG: KASAN: slab-use-after-free in smk_access+0xae/0x4e0 security/smack/smack_access.c:147 Read of size 8 at addr ffff8880540f0840 by task syz.0.2019/15223 CPU: 0 UID: 0 PID: 15223 Comm: syz.0.2019 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 smk_access+0xae/0x4e0 security/smack/smack_access.c:147 smack_watch_key+0x2f4/0x3a0 security/smack/smack_lsm.c:4656 security_watch_key+0x86/0x250 security/security.c:4448 keyctl_watch_key+0x2b7/0x480 security/keys/keyctl.c:1813 __do_sys_keyctl security/keys/keyctl.c:2021 [inline] __se_sys_keyctl+0x106/0xa50 security/keys/keyctl.c:1874 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8c7537def9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8c76117038 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007f8c75535f80 RCX: 00007f8c7537def9 RDX: 0000000000000004 RSI: 0000000020b8ab90 RDI: 0000000000000020 RBP: 00007f8c753f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8c75535f80 R15: 00007fff96e1bf68 Allocated by task 13484: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4159 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4178 kvasprintf+0xdf/0x190 lib/kasprintf.c:25 kobject_set_name_vargs+0x61/0x120 lib/kobject.c:274 kobject_add_varg lib/kobject.c:368 [inline] kobject_init_and_add+0xde/0x190 lib/kobject.c:457 rx_queue_add_kobject net/core/net-sysfs.c:1109 [inline] net_rx_queue_update_kobjects+0x1cf/0x5b0 net/core/net-sysfs.c:1164 register_queue_kobjects net/core/net-sysfs.c:1898 [inline] netdev_register_kobject+0x224/0x310 net/core/net-sysfs.c:2143 register_netdevice+0x12c5/0x1b00 net/core/dev.c:10487 __ip_tunnel_create+0x2b4/0x380 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x21c/0x720 net/ipv4/ip_tunnel.c:1160 ops_init+0x31e/0x590 net/core/net_namespace.c:139 setup_net+0x287/0x9e0 net/core/net_namespace.c:356 copy_net_ns+0x33f/0x570 net/core/net_namespace.c:494 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228 ksys_unshare+0x619/0xc10 kernel/fork.c:3309 __do_sys_unshare kernel/fork.c:3380 [inline] __se_sys_unshare kernel/fork.c:3378 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3378 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 52: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2250 [inline] slab_free mm/slub.c:4474 [inline] kfree+0x149/0x360 mm/slub.c:4595 kobject_cleanup lib/kobject.c:695 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x272/0x480 lib/kobject.c:737 net_rx_queue_update_kobjects+0x52b/0x5b0 net/core/net-sysfs.c:1178 remove_queue_kobjects net/core/net-sysfs.c:1953 [inline] netdev_unregister_kobject+0x104/0x250 net/core/net-sysfs.c:2107 unregister_netdevice_many_notify+0x1851/0x1da0 net/core/dev.c:11433 cleanup_net+0x75d/0xcc0 net/core/net_namespace.c:621 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x870/0xd30 kernel/workqueue.c:3393 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8880540f0840 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of freed 8-byte region [ffff8880540f0840, ffff8880540f0848) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x540f0 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801a841500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080800080 00000001fdffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 12842, tgid 12840 (syz.3.1479), ts 1023531992496, free_ts 1022325300939 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2319 allocate_slab+0x5a/0x2f0 mm/slub.c:2482 new_slab mm/slub.c:2535 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721 __slab_alloc+0x58/0xa0 mm/slub.c:3811 __slab_alloc_node mm/slub.c:3864 [inline] slab_alloc_node mm/slub.c:4026 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4178 kstrdup+0x3a/0x80 mm/util.c:64 __kernfs_new_node+0x9d/0x870 fs/kernfs/dir.c:620 kernfs_new_node+0x137/0x240 fs/kernfs/dir.c:700 __kernfs_create_file+0x49/0x2e0 fs/kernfs/file.c:1034 sysfs_add_file_mode_ns+0x24a/0x310 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:76 [inline] internal_create_group+0x7a7/0x11d0 fs/sysfs/group.c:180 internal_create_groups fs/sysfs/group.c:220 [inline] sysfs_create_groups+0x56/0x120 fs/sysfs/group.c:246 setup_port drivers/infiniband/core/sysfs.c:1258 [inline] ib_setup_port_attrs+0xfae/0x2440 drivers/infiniband/core/sysfs.c:1444 page last free pid 12864 tgid 12860 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_folios+0x100f/0x1ac0 mm/page_alloc.c:2667 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x44f/0xc80 mm/mmap.c:3425 __mmput+0x115/0x380 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880540f0700: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff8880540f0780: fa fc fc fc fa fc fc fc fa fc fc fc 05 fc fc fc >ffff8880540f0800: fa fc fc fc 00 fc fc fc fa fc fc fc 00 fc fc fc ^ ffff8880540f0880: 05 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff8880540f0900: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ==================================================================