================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2326 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run2+0xfa/0x540 kernel/trace/bpf_trace.c:2381 Read of size 8 at addr ffff888033152618 by task udevd/6024 CPU: 1 UID: 0 PID: 6024 Comm: udevd Not tainted 6.12.0-rc5-next-20241101-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:2326 [inline] bpf_trace_run2+0xfa/0x540 kernel/trace/bpf_trace.c:2381 __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: 0033:0x7f8bac57fb6a 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:00007ffca52aa8c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8bac57fb6a RDX: 0000000000000080 RSI: 00007ffca52aa9b8 RDI: 0000000000000003 RBP: 00007ffca52aa908 R08: 0000000000000007 R09: e9aebb0f1acd71b9 R10: 00000000ffffffff R11: 0000000000000246 R12: 000055e072bc1db0 R13: 00007ffca52aa908 R14: 0000000000000001 R15: 000055e072a72910 Allocated by task 6269: 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:4314 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:3934 bpf_raw_tracepoint_open+0x177/0x1f0 kernel/bpf/syscall.c:3981 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5796 __do_sys_bpf kernel/bpf/syscall.c:5861 [inline] __se_sys_bpf kernel/bpf/syscall.c:5859 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5859 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 0: 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:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x196/0x420 mm/slub.c:4746 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 __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:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 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: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:3145 [inline] bpf_link_release+0x78/0x90 kernel/bpf/syscall.c:3152 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 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 ffff888033152600 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888033152600, ffff888033152680) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x33152 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41a00 dead000000000122 0000000000000000 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 6263, tgid 6260 (syz.2.65), ts 106477573833, free_ts 105665240252 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1541 prep_new_page mm/page_alloc.c:1549 [inline] get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3495 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_slab_page+0x59/0x140 mm/slub.c:2410 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_noprof+0x2ee/0x4d0 mm/slub.c:4289 kmalloc_array_node_noprof include/linux/slab.h:1018 [inline] alloc_slab_obj_exts+0x3a/0xa0 mm/slub.c:1964 __memcg_slab_post_alloc_hook+0x319/0x7e0 mm/memcontrol.c:3001 memcg_slab_post_alloc_hook mm/slub.c:2152 [inline] slab_post_alloc_hook mm/slub.c:4114 [inline] slab_alloc_node mm/slub.c:4153 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_track_caller_noprof+0x308/0x4c0 mm/slub.c:4302 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2875 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2027 page last free pid 58 tgid 58 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1112 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2678 vfree+0x186/0x2e0 mm/vmalloc.c:3382 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3303 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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 Memory state around the buggy address: ffff888033152500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888033152580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888033152600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888033152680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888033152700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================