================================================================== BUG: KASAN: slab-out-of-bounds in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 Read of size 8 at addr ffffaf8010303b50 by task syz-executor.0/2039 CPU: 0 PID: 2039 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708 [] __bfs_forwards kernel/locking/lockdep.c:1803 [inline] [] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104 [] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131 [] check_prev_add kernel/locking/lockdep.c:3063 [inline] [] check_prevs_add kernel/locking/lockdep.c:3186 [inline] [] validate_chain kernel/locking/lockdep.c:3801 [inline] [] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027 [] lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 [] lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 [] local_lock_acquire include/linux/local_lock_internal.h:29 [inline] [] rmqueue_pcplist mm/page_alloc.c:3660 [inline] [] rmqueue mm/page_alloc.c:3698 [inline] [] get_page_from_freelist+0xbc2/0x12d8 mm/page_alloc.c:4162 Allocated by task 2038: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc+0x190/0x318 mm/slub.c:4424 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] kobject_get_path+0xac/0x16e lib/kobject.c:179 kobject_uevent_env+0x1de/0xdfe lib/kobject_uevent.c:529 kobject_uevent+0x22/0x2e lib/kobject_uevent.c:642 rx_queue_add_kobject net/core/net-sysfs.c:1061 [inline] net_rx_queue_update_kobjects+0xd6/0x3c6 net/core/net-sysfs.c:1101 register_queue_kobjects net/core/net-sysfs.c:1761 [inline] netdev_register_kobject+0x166/0x208 net/core/net-sysfs.c:2012 register_netdevice+0x8ee/0xc6a net/core/dev.c:9667 veth_newlink+0x30e/0x7dc drivers/net/veth.c:1691 __rtnl_newlink+0xc16/0xfa0 net/core/rtnetlink.c:3479 rtnl_newlink+0x60/0x8c net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x338/0x9a0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0xf8/0x2be net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:5610 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x40e/0x5fe net/netlink/af_netlink.c:1343 netlink_sendmsg+0x4e0/0x994 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xa0/0xc4 net/socket.c:725 __sys_sendto+0x1f2/0x2e0 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] sys_sendto+0x3e/0x52 net/socket.c:2048 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ffffaf8010303b00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes to the right of 64-byte region [ffffaf8010303b00, ffffaf8010303b40) The buggy address belongs to the page: page:ffffaf807aad68d8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x90503 flags: 0x9000000200(slab|section=18|node=0|zone=0) raw: 0000009000000200 0000000000000000 0000000000000122 ffffaf8007201640 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 raw: 00000000000007ff page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 2457, ts 627705598000, free_ts 621603118000 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x76/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x268/0x318 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] tomoyo_encode2.part.0+0xf0/0x264 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode security/tomoyo/realpath.c:80 [inline] tomoyo_realpath_from_path+0x14c/0x3f4 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x282/0x348 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline] tomoyo_file_open+0x78/0x7c security/tomoyo/tomoyo.c:306 security_file_open+0x44/0x9a security/security.c:1627 do_dentry_open+0x1c6/0x7d4 fs/open.c:811 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 __free_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __slab_free+0x20a/0x29c mm/slub.c:3414 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x156/0x318 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tomoyo_realpath_from_path+0x9c/0x3f4 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x1fc/0x3a8 security/tomoyo/file.c:822 tomoyo_inode_getattr+0x1e/0x28 security/tomoyo/tomoyo.c:122 security_inode_getattr+0x82/0xc6 security/security.c:1326 Memory state around the buggy address: ffffaf8010303a00: f1 f1 f1 f1 00 f3 f3 f3 fc fc fc fc fc fc fc fc ffffaf8010303a80: fa fb fb fb fb fb fb fb fc fc fc fc 00 00 00 00 >ffffaf8010303b00: f1 f1 f1 f1 00 f2 f2 f2 fc fc fc fc 00 00 00 f3 ^ ffffaf8010303b80: f3 f3 f3 f3 fb fb fb fb fc fc fc fc fc fc fc fc ffffaf8010303c00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================