================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2382 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2436 Read of size 8 at addr ffff888011374418 by task syz-executor.2/7969 CPU: 1 PID: 7969 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-05243-g14bb1e8c8d4a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 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 __bpf_trace_run kernel/trace/bpf_trace.c:2382 [inline] bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2436 __traceiter_mm_lru_insertion+0x71/0xc0 include/trace/events/pagemap.h:28 trace_mm_lru_insertion include/trace/events/pagemap.h:28 [inline] lru_add_fn+0xee0/0x19f0 mm/swap.c:200 folio_batch_move_lru+0x322/0x6e0 mm/swap.c:217 folio_add_lru+0x475/0xd70 mm/swap.c:517 wp_page_copy mm/memory.c:3206 [inline] do_wp_page+0x1c59/0x4c90 mm/memory.c:3525 handle_pte_fault mm/memory.c:5180 [inline] __handle_mm_fault+0x26ad/0x72d0 mm/memory.c:5305 handle_mm_fault+0x3c2/0x8a0 mm/memory.c:5470 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x446/0x890 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f868f846d97 Code: 00 00 e9 8f e7 ff ff ba 01 00 00 00 e9 a9 ee ff ff 66 90 41 57 41 56 41 55 49 89 d5 41 54 55 53 48 89 fb 48 81 ec 18 05 00 00 <48> 89 74 24 08 89 4c 24 48 64 48 8b 04 25 28 00 00 00 48 89 84 24 RSP: 002b:00007ffef07c6fe0 EFLAGS: 00010202 RAX: 00007ffef07c7860 RBX: 00007ffef07c7540 RCX: 0000000000000000 RDX: 00007ffef07c76c0 RSI: 00007f868f8ca390 RDI: 00007ffef07c7540 RBP: 00007ffef07c7630 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f868f8ca390 R13: 00007ffef07c76c0 R14: 0000000000000000 R15: 00007ffef07c7540 Allocated by task 7961: 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] kmalloc_trace+0x1d9/0x360 mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3816 bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3863 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5673 __do_sys_bpf kernel/bpf/syscall.c:5738 [inline] __se_sys_bpf kernel/bpf/syscall.c:5736 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5736 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Freed by task 7962: 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:589 poison_slab_object+0xa6/0xe0 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:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071 __fput+0x429/0x8a0 fs/file_table.c:423 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x176e/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888011374400 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888011374400, ffff888011374480) The buggy address belongs to the physical page: page:ffffea000044dd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11374 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 ffffea0000b5bf00 dead000000000002 raw: 0000000000000000 0000000080100010 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 1085, tgid 1085 (kworker/u8:6), ts 124482983606, free_ts 124451475815 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x256/0x680 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd1b/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmalloc_trace+0x267/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] __hw_addr_create net/core/dev_addr_lists.c:60 [inline] __hw_addr_add_ex+0x1a8/0x610 net/core/dev_addr_lists.c:118 __hw_addr_sync_one net/core/dev_addr_lists.c:216 [inline] __hw_addr_sync_multiple net/core/dev_addr_lists.c:256 [inline] dev_mc_sync_multiple+0x1f5/0x3d0 net/core/dev_addr_lists.c:994 hsr_set_rx_mode+0xa4/0x130 net/hsr/hsr_device.c:427 __dev_mc_add net/core/dev_addr_lists.c:871 [inline] dev_mc_add+0xca/0x110 net/core/dev_addr_lists.c:885 igmp6_group_added+0x1a4/0x710 net/ipv6/mcast.c:680 __ipv6_dev_mc_inc+0x8b8/0xa90 net/ipv6/mcast.c:949 addrconf_join_solict net/ipv6/addrconf.c:2238 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4099 [inline] addrconf_dad_work+0x448/0x16f0 net/ipv6/addrconf.c:4224 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 page last free pid 44 tgid 44 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17c/0x250 mm/slub.c:2997 __slab_free+0x302/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 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:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x192/0x380 mm/slub.c:3903 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:658 alloc_skb include/linux/skbuff.h:1318 [inline] alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6504 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2795 sock_alloc_send_skb include/net/sock.h:1835 [inline] mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 add_grhead net/ipv6/mcast.c:1849 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 mld_send_cr net/ipv6/mcast.c:2113 [inline] mld_ifc_work+0x68e/0xd90 net/ipv6/mcast.c:2650 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 Memory state around the buggy address: ffff888011374300: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888011374380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888011374400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888011374480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888011374500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ==================================================================