================================================================== 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 ffff888025370818 by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0-rc1-next-20240328-syzkaller #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+0x241/0x360 lib/dump_stack.c:114 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+0x1b4/0x1e0 include/trace/events/rcu.h:27 rcu_note_context_switch+0xc7c/0xff0 kernel/rcu/tree_plugin.h:360 __schedule+0x348/0x4a50 kernel/sched/core.c:6635 schedule_idle+0x53/0x90 kernel/sched/core.c:6864 do_idle+0x56a/0x5d0 kernel/sched/idle.c:360 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430 rest_init+0x2dc/0x300 init/main.c:738 start_kernel+0x47a/0x500 init/main.c:1080 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 Allocated by task 14580: 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_noprof+0x19c/0x2b0 mm/slub.c:4079 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:775 [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 14579: 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:579 poison_slab_object+0xe0/0x150 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:2180 [inline] slab_free mm/slub.c:4363 [inline] kfree+0x149/0x350 mm/slub.c:4484 bpf_link_release+0x3b/0x50 kernel/bpf/syscall.c:3071 __fput+0x429/0x8a0 fs/file_table.c:422 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+0x16a1/0x1740 kernel/signal.c:2911 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 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+0xc9/0x360 kernel/entry/common.c:218 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 ffff888025370800 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888025370800, ffff888025370880) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25370 flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff8880150418c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffefff 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 10566, tgid -981530761 (dhcpcd-run-hook), ts 10566, free_ts 222348216819 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1487 prep_new_page mm/page_alloc.c:1495 [inline] get_page_from_freelist+0x2e8a/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] __do_kmalloc_node mm/slub.c:4047 [inline] __kmalloc_node_noprof+0x28b/0x450 mm/slub.c:4055 kmalloc_array_node_noprof include/linux/slab.h:756 [inline] alloc_slab_obj_exts mm/slub.c:1931 [inline] account_slab mm/slub.c:2375 [inline] allocate_slab+0xb6/0x2e0 mm/slub.c:2430 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:3934 vm_area_dup+0x27/0x290 kernel/fork.c:482 dup_mmap kernel/fork.c:697 [inline] dup_mm kernel/fork.c:1687 [inline] copy_mm+0xd95/0x21b0 kernel/fork.c:1736 copy_process+0x187a/0x3dc0 kernel/fork.c:2389 kernel_clone+0x226/0x8f0 kernel/fork.c:2796 page last free pid 10580 tgid 10580 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_folios+0xf23/0x19e0 mm/page_alloc.c:2666 folios_put_refs+0x93a/0xa60 mm/swap.c:1034 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x459/0xcf0 mm/mmap.c:3279 __mmput+0x115/0x3c0 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:569 do_exit+0x99e/0x27e0 kernel/exit.c:865 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: ffff888025370700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025370780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888025370800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025370880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888025370900: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================