================================================================== 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 ffff88806e043a18 by task syz-executor.3/6883 CPU: 0 PID: 6883 Comm: syz-executor.3 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_rcu_utilization+0x74/0xb0 include/trace/events/rcu.h:27 trace_rcu_utilization+0x194/0x1c0 include/trace/events/rcu.h:27 rcu_note_context_switch+0xc7c/0xff0 kernel/rcu/tree_plugin.h:360 __schedule+0x345/0x4a20 kernel/sched/core.c:6635 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7058 irqentry_exit+0x5e/0x90 kernel/entry/common.c:348 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:mt_validate+0xee6/0x4aa0 lib/maple_tree.c:7595 Code: 30 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 dd 96 92 f6 4c 8b 3b 31 ff 4c 89 fe e8 20 41 2f f6 31 ff 8b 5c 24 08 <89> de e8 73 40 2f f6 4d 85 ff 75 08 85 db 0f 85 e2 00 00 00 e8 21 RSP: 0018:ffffc90011067680 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff888067e70000 RDX: ffff888067e70000 RSI: 0000000020ffffff RDI: 0000000000000000 RBP: ffffc90011067870 R08: ffffffff8b65b410 R09: ffffffff8b65b282 R10: 0000000000000004 R11: ffff888067e70000 R12: 0000000000000001 R13: 000000001fffffff R14: 000000000000000f R15: 0000000020ffffff validate_mm+0xe7/0x530 mm/mmap.c:288 __split_vma+0xb1a/0xd00 mm/mmap.c:2389 split_vma mm/mmap.c:2415 [inline] vma_modify+0x24e/0x410 mm/mmap.c:2450 vma_modify_flags include/linux/mm.h:3283 [inline] mprotect_fixup+0x4a6/0xb80 mm/mprotect.c:635 do_mprotect_pkey+0x903/0xe20 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:827 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f49ac87de67 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 00 00 00 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:00007ffd420fb2f8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a RAX: ffffffffffffffda RBX: 00007f49abbde6c0 RCX: 00007f49ac87de67 RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f49abbbf000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffd420fb5a0 R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000 Allocated by task 6866: 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 6876: 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 ffff88806e043a00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88806e043a00, ffff88806e043a80) The buggy address belongs to the physical page: page:ffffea0001b810c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6e043 ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 ffffea0001f21240 dead000000000003 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5732, tgid 5732 (syz-executor.3), ts 102328938590, free_ts 102287226779 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_add net/core/dev_addr_lists.c:135 [inline] dev_addr_init+0x143/0x230 net/core/dev_addr_lists.c:558 alloc_netdev_mqs+0x2a7/0xf80 net/core/dev.c:10857 __ip_tunnel_create+0x209/0x380 net/ipv4/ip_tunnel.c:253 ip_tunnel_init_net+0x223/0x710 net/ipv4/ip_tunnel.c:1117 ops_init+0x352/0x610 net/core/net_namespace.c:136 setup_net+0x515/0xca0 net/core/net_namespace.c:340 copy_net_ns+0x4e4/0x7b0 net/core/net_namespace.c:505 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110 page last free pid 5073 tgid 5073 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 vfree+0x186/0x2e0 mm/vmalloc.c:2914 kcov_put kernel/kcov.c:429 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:525 __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 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Memory state around the buggy address: ffff88806e043900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806e043980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806e043a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806e043a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806e043b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 30 48 89 xor %cl,-0x77(%rax) 3: d8 48 c1 fmuls -0x3f(%rax) 6: e8 03 42 80 3c call 0x3c80420e b: 38 00 cmp %al,(%rax) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 dd 96 92 f6 call 0xf69296f4 17: 4c 8b 3b mov (%rbx),%r15 1a: 31 ff xor %edi,%edi 1c: 4c 89 fe mov %r15,%rsi 1f: e8 20 41 2f f6 call 0xf62f4144 24: 31 ff xor %edi,%edi 26: 8b 5c 24 08 mov 0x8(%rsp),%ebx * 2a: 89 de mov %ebx,%esi <-- trapping instruction 2c: e8 73 40 2f f6 call 0xf62f40a4 31: 4d 85 ff test %r15,%r15 34: 75 08 jne 0x3e 36: 85 db test %ebx,%ebx 38: 0f 85 e2 00 00 00 jne 0x120 3e: e8 .byte 0xe8 3f: 21 .byte 0x21