================================================================== BUG: KASAN: slab-use-after-free in bpf_link_free+0x28d/0x320 kernel/bpf/syscall.c:3065 Read of size 8 at addr ffff88807ea2c310 by task syz-executor.4/13869 CPU: 0 PID: 13869 Comm: syz-executor.4 Not tainted 6.9.0-rc7-syzkaller-00136-gf4345f05c0df #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bpf_link_free+0x28d/0x320 kernel/bpf/syscall.c:3065 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x63/0x80 kernel/bpf/syscall.c:3100 __fput+0x273/0xb80 fs/file_table.c:422 task_work_run+0x151/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f950b07dd69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f950be290c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f950b1abf80 RCX: 00007f950b07dd69 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: 00007f950b0ca49e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f950b1abf80 R15: 00007fffb6d856d8 Allocated by task 13869: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] bpf_raw_tp_link_attach+0x188/0x610 kernel/bpf/syscall.c:3850 bpf_raw_tracepoint_open kernel/bpf/syscall.c:3892 [inline] __sys_bpf+0x3a0/0x4b40 kernel/bpf/syscall.c:5702 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5765 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13879: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2111 [inline] slab_free mm/slub.c:4286 [inline] kfree+0x129/0x3a0 mm/slub.c:4396 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0x82b/0x16b0 kernel/rcu/tree.c:2471 handle_softirqs+0x219/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2734 bpf_link_free+0x26a/0x320 kernel/bpf/syscall.c:3063 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x63/0x80 kernel/bpf/syscall.c:3100 __fput+0x273/0xb80 fs/file_table.c:422 task_work_run+0x151/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807ea2c300 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 16 bytes inside of freed 128-byte region [ffff88807ea2c300, ffff88807ea2c380) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ea2c anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8880150418c0 ffffea00006fbbc0 dead000000000005 raw: 0000000000000000 0000000000100010 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5855, tgid -816918629 (syz-executor.2), ts 5855, free_ts 158080767460 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2180 [inline] allocate_slab mm/slub.c:2343 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2396 ___slab_alloc+0x66d/0x1790 mm/slub.c:3530 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3615 __slab_alloc_node mm/slub.c:3668 [inline] slab_alloc_node mm/slub.c:3841 [inline] __do_kmalloc_node mm/slub.c:3971 [inline] __kmalloc_node+0x379/0x480 mm/slub.c:3979 kmalloc_array_node include/linux/slab.h:726 [inline] kcalloc_node include/linux/slab.h:731 [inline] memcg_alloc_slab_cgroups+0xa9/0x180 mm/memcontrol.c:3015 account_slab mm/slub.c:2306 [inline] allocate_slab mm/slub.c:2361 [inline] new_slab+0x2ed/0x3a0 mm/slub.c:2396 ___slab_alloc+0x66d/0x1790 mm/slub.c:3530 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3615 __slab_alloc_node mm/slub.c:3668 [inline] slab_alloc_node mm/slub.c:3841 [inline] __do_kmalloc_node mm/slub.c:3971 [inline] __kmalloc+0x3bf/0x440 mm/slub.c:3985 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] __register_sysctl_table+0xac/0x16c0 fs/proc/proc_sysctl.c:1360 mpls_dev_sysctl_register+0x1eb/0x330 net/mpls/af_mpls.c:1422 mpls_add_dev net/mpls/af_mpls.c:1478 [inline] mpls_dev_notify+0x498/0xa10 net/mpls/af_mpls.c:1618 notifier_call_chain+0xbc/0x410 kernel/notifier.c:93 page last free pid 5858 tgid 5858 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 __put_partials+0x14c/0x170 mm/slub.c:2911 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3851 [inline] __do_kmalloc_node mm/slub.c:3971 [inline] __kmalloc+0x1bd/0x440 mm/slub.c:3985 kmalloc include/linux/slab.h:632 [inline] metadata_dst_alloc+0x25/0x60 net/core/dst.c:282 macsec_add_dev drivers/net/macsec.c:4102 [inline] macsec_newlink+0xe1f/0x1b00 drivers/net/macsec.c:4217 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline] __rtnl_newlink+0x119a/0x1960 net/core/rtnetlink.c:3714 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x3ca/0xe60 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x16e/0x440 net/netlink/af_netlink.c:2559 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x545/0x820 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x482/0x4e0 net/socket.c:2191 Memory state around the buggy address: ffff88807ea2c200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807ea2c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807ea2c300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ea2c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ea2c400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================