================================================================== BUG: KASAN: slab-use-after-free in smk_access+0xae/0x4e0 security/smack/smack_access.c:147 Read of size 8 at addr ffff8880118c47e0 by task syz.4.911/11251 CPU: 1 UID: 0 PID: 11251 Comm: syz.4.911 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: 0033:0x7f0536d7def9 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:00007f0537b50038 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007f0536f35f80 RCX: 00007f0536d7def9 RDX: 0000000000000009 RSI: 000000003794c4f4 RDI: 0000000000000020 RBP: 00007f0536df0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000b1 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0536f35f80 R15: 00007ffc7f2193f8 Allocated by task 11140: 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 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_dir_ns+0x43/0x120 fs/kernfs/dir.c:1061 sysfs_create_dir_ns+0x189/0x3a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x435/0x8d0 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_init_and_add+0x124/0x190 lib/kobject.c:457 netdev_queue_add_kobject net/core/net-sysfs.c:1789 [inline] netdev_queue_update_kobjects+0x1f5/0x550 net/core/net-sysfs.c:1841 register_queue_kobjects net/core/net-sysfs.c:1903 [inline] netdev_register_kobject+0x265/0x310 net/core/net-sysfs.c:2143 register_netdevice+0x12c5/0x1b00 net/core/dev.c:10487 veth_newlink+0x855/0xce0 drivers/net/veth.c:1861 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink net/core/rtnetlink.c:3730 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6646 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x398/0x4f0 net/socket.c:2210 __do_sys_sendto net/socket.c:2222 [inline] __se_sys_sendto net/socket.c:2218 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2218 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 11140: 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 kernfs_free_rcu+0x3f/0x100 fs/kernfs/dir.c:536 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 sock_orphan include/net/sock.h:2005 [inline] unix_release_sock+0x4b8/0xd00 net/unix/af_unix.c:682 unix_release+0x91/0xc0 net/unix/af_unix.c:1109 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1427 __fput+0x23f/0x880 fs/file_table.c:431 __do_sys_close fs/open.c:1565 [inline] __se_sys_close fs/open.c:1550 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1550 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 The buggy address belongs to the object at ffff8880118c47e0 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of freed 8-byte region [ffff8880118c47e0, ffff8880118c47e8) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118c4 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801a841500 0000000000000000 0000000000000001 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 8299, tgid 8292 (syz.1.466), ts 480333291438, free_ts 480330149667 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_gid_attrs drivers/infiniband/core/sysfs.c:1173 [inline] ib_setup_port_attrs+0x16a4/0x2440 drivers/infiniband/core/sysfs.c:1450 page last free pid 8299 tgid 8292 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619 __slab_free+0x31b/0x3d0 mm/slub.c:4385 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3989 [inline] slab_alloc_node mm/slub.c:4038 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045 __kernfs_new_node+0xd8/0x870 fs/kernfs/dir.c:624 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_gid_attrs drivers/infiniband/core/sysfs.c:1173 [inline] ib_setup_port_attrs+0x16a4/0x2440 drivers/infiniband/core/sysfs.c:1450 add_one_compat_dev+0x51a/0x710 drivers/infiniband/core/device.c:975 add_compat_devs drivers/infiniband/core/device.c:1033 [inline] enable_device_and_get+0x31a/0x440 drivers/infiniband/core/device.c:1344 ib_register_device+0x10d4/0x13d0 drivers/infiniband/core/device.c:1426 Memory state around the buggy address: ffff8880118c4680: 05 fc fc fc 00 fc fc fc 05 fc fc fc 05 fc fc fc ffff8880118c4700: 05 fc fc fc 05 fc fc fc fa fc fc fc fa fc fc fc >ffff8880118c4780: fa fc fc fc fa fc fc fc 00 fc fc fc fa fc fc fc ^ ffff8880118c4800: 05 fc fc fc 05 fc fc fc fa fc fc fc fa fc fc fc ffff8880118c4880: 05 fc fc fc 05 fc fc fc fa fc fc fc fa fc fc fc ==================================================================