================================================================== BUG: KASAN: slab-use-after-free in bpf_link_free+0x234/0x2d0 kernel/bpf/syscall.c:3065 Read of size 8 at addr ffff88807f697710 by task syz-executor.0/9777 CPU: 1 PID: 9777 Comm: syz-executor.0 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+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_link_free+0x234/0x2d0 kernel/bpf/syscall.c:3065 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x7b/0x90 kernel/bpf/syscall.c:3100 __fput+0x42b/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f701da7cc5a Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007fff7f4c6930 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f701da7cc5a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fff7f4c6a08 R08: 00007f701da00000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000293 R12: 00000000000629bf R13: 00007f701dbabf8c R14: 00007f701dbabf80 R15: 0000000000000032 Allocated by task 9778: 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+0x1db/0x370 mm/slub.c:4003 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] bpf_raw_tp_link_attach+0x2a4/0x6d0 kernel/bpf/syscall.c:3850 bpf_raw_tracepoint_open+0x19d/0x210 kernel/bpf/syscall.c:3892 __sys_bpf+0x3c0/0x810 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+0x7c/0x90 kernel/bpf/syscall.c:5765 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 34: 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+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:2111 [inline] slab_free mm/slub.c:4286 [inline] kfree+0x153/0x3b0 mm/slub.c:4396 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0xaff/0x1830 kernel/rcu/tree.c:2471 handle_softirqs+0x2d8/0x990 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 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+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:2734 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2838 bpf_link_free+0x1f8/0x2d0 kernel/bpf/syscall.c:3063 bpf_link_put_direct kernel/bpf/syscall.c:3093 [inline] bpf_link_release+0x7b/0x90 kernel/bpf/syscall.c:3100 __fput+0x42b/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807f697700 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 16 bytes inside of freed 128-byte region [ffff88807f697700, ffff88807f697780) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f697 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8880150418c0 dead000000000122 0000000000000000 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 9770, tgid -174579076 (syz-executor.0), ts 9773, free_ts 402973788470 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 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+0x5f/0x160 mm/slub.c:2180 allocate_slab mm/slub.c:2343 [inline] new_slab+0x84/0x2f0 mm/slub.c:2396 ___slab_alloc+0xc73/0x1260 mm/slub.c:3530 __slab_alloc mm/slub.c:3615 [inline] __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+0x2db/0x4f0 mm/slub.c:3979 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0x72/0x190 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] btf_parse kernel/bpf/btf.c:5574 [inline] btf_new_fd+0x28f/0xad0 kernel/bpf/btf.c:7461 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5705 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5765 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 56 tgid 56 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+0x986/0xab0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:408 apply_to_pte_range mm/memory.c:2744 [inline] apply_to_pmd_range mm/memory.c:2788 [inline] apply_to_pud_range mm/memory.c:2824 [inline] apply_to_p4d_range mm/memory.c:2860 [inline] __apply_to_page_range+0x8ee/0xe40 mm/memory.c:2894 kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:525 purge_vmap_node+0x3e3/0x770 mm/vmalloc.c:2183 __purge_vmap_area_lazy+0x715/0xaf0 mm/vmalloc.c:2265 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2299 process_one_work kernel/workqueue.c:3267 [inline] process_scheduled_works+0xa12/0x17c0 kernel/workqueue.c:3348 worker_thread+0x86d/0xd70 kernel/workqueue.c:3429 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88807f697600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807f697680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807f697700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807f697780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807f697800: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================