================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2304 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run2+0xfa/0x540 kernel/trace/bpf_trace.c:2359 Read of size 8 at addr ffff88802700db18 by task udevd/8871 CPU: 0 UID: 0 PID: 8871 Comm: udevd Not tainted 6.12.0-rc3-next-20241016-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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:2304 [inline] bpf_trace_run2+0xfa/0x540 kernel/trace/bpf_trace.c:2359 __bpf_trace_sys_enter+0x38/0x60 include/trace/events/syscalls.h:18 trace_sys_enter+0xd9/0x150 include/trace/events/syscalls.h:18 syscall_trace_enter+0xf8/0x150 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0xcc/0x230 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f23a5316b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffe4b5b24f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f23a5316b6a RDX: 0000000000000080 RSI: 00007ffe4b5b25e8 RDI: 0000000000000003 RBP: 00007ffe4b5b2538 R08: 0000000000000007 R09: 20e89c4002ea71b6 R10: 00000000ffffffff R11: 0000000000000246 R12: 000055e47d268ec0 R13: 00007ffe4b5b2538 R14: 0000000000000001 R15: 000055e47d243910 Allocated by task 9038: 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:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4304 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] bpf_raw_tp_link_attach+0x2a0/0x6e0 kernel/bpf/syscall.c:3829 bpf_raw_tracepoint_open+0x177/0x1f0 kernel/bpf/syscall.c:3876 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5691 __do_sys_bpf kernel/bpf/syscall.c:5756 [inline] __se_sys_bpf kernel/bpf/syscall.c:5754 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5754 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 16: 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:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2329 [inline] slab_free mm/slub.c:4588 [inline] kfree+0x1a0/0x460 mm/slub.c:4736 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:921 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 bpf_link_put_direct kernel/bpf/syscall.c:3045 [inline] bpf_link_release+0x78/0x90 kernel/bpf/syscall.c:3052 __fput+0x23c/0xa50 fs/file_table.c:434 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16a3/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802700db00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff88802700db00, ffff88802700db80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2700d flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41a00 ffffea0001e80f40 dead000000000004 raw: 0000000000000000 0000000080100010 00000001f5000000 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5426, tgid 5426 (syz-executor), ts 178694625862, free_ts 178675200189 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3123/0x3270 mm/page_alloc.c:3493 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4769 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2399 allocate_slab+0x5a/0x2f0 mm/slub.c:2565 new_slab mm/slub.c:2618 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3805 __slab_alloc+0x58/0xa0 mm/slub.c:3895 __slab_alloc_node mm/slub.c:3970 [inline] slab_alloc_node mm/slub.c:4131 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4299 kmalloc_noprof include/linux/slab.h:901 [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+0x2ae/0x1080 net/core/dev.c:11177 rtnl_create_link+0x2f9/0xc20 net/core/rtnetlink.c:3477 veth_newlink+0x2c3/0xcd0 drivers/net/veth.c:1815 rtnl_newlink_create net/core/rtnetlink.c:3613 [inline] __rtnl_newlink net/core/rtnetlink.c:3833 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3846 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6749 page last free pid 5500 tgid 5500 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2674 tlb_batch_list_free mm/mmu_gather.c:159 [inline] tlb_finish_mmu+0x11f/0x200 mm/mmu_gather.c:468 exit_mmap+0x496/0xc40 mm/mmap.c:1891 __mmput+0x115/0x390 kernel/fork.c:1346 exit_mm+0x220/0x310 kernel/exit.c:570 do_exit+0x9b2/0x28e0 kernel/exit.c:925 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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 Memory state around the buggy address: ffff88802700da00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff88802700da80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802700db00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802700db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802700dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================