================================================================== BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2376 [inline] BUG: KASAN: slab-use-after-free in bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2430 Read of size 8 at addr ffff888022135c18 by task syz-executor.4/9720 CPU: 0 PID: 9720 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-05239-g476a5e929119 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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:2376 [inline] bpf_trace_run1+0xcb/0x510 kernel/trace/bpf_trace.c:2430 __traceiter_rcu_utilization+0x74/0xb0 include/trace/events/rcu.h:27 trace_rcu_utilization+0x194/0x1c0 include/trace/events/rcu.h:27 rcu_core+0x11f1/0x1830 kernel/rcu/tree.c:2479 __do_softirq+0x2bc/0x943 kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645 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 RIP: 0010:__fd_array_map_delete_elem+0x219/0x280 kernel/bpf/arraymap.c:892 Code: c7 c0 f9 ff ff ff eb 37 e8 44 bf df ff 49 8d bc ed d0 01 00 00 be 08 00 00 00 e8 62 1c 43 00 45 31 ff 4d 87 bc ed d0 01 00 00 <4d> 85 ff 0f 85 6b ff ff ff e8 19 bf df ff 48 c7 c0 fe ff ff ff 48 RSP: 0018:ffffc90003cffbd8 EFLAGS: 00000246 RAX: ffffffff81b53101 RBX: ffffffff8bb1de18 RCX: ffffffff81b5311e RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90004f8a948 RBP: 00000000000030ef R08: ffffc90004f8a94f R09: 1ffff920009f1529 R10: dffffc0000000000 R11: fffff520009f152a R12: 0000000000000000 R13: ffffc90004f72000 R14: 1ffff920009ee400 R15: 0000000000000000 bpf_fd_array_map_clear kernel/bpf/arraymap.c:939 [inline] cgroup_fd_array_free+0xe3/0x250 kernel/bpf/arraymap.c:1274 map_create+0xe2d/0x1200 kernel/bpf/syscall.c:1402 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5613 __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 RIP: 0033:0x7fbba1e7dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fbba2c620c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fbba1fabf80 RCX: 00007fbba1e7dda9 RDX: 0000000000000048 RSI: 0000000020004080 RDI: 0000000000000000 RBP: 00007fbba1eca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fbba1fabf80 R15: 00007ffc2f5adbf8 Allocated by task 9723: 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 9721: 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 __do_sys_close fs/open.c:1557 [inline] __se_sys_close fs/open.c:1542 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1542 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 The buggy address belongs to the object at ffff888022135c00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888022135c00, ffff888022135c80) The buggy address belongs to the physical page: page:ffffea0000884d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22135 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c418c0 ffffea0000af63c0 dead000000000002 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4524, tgid 4524 (udevadm), ts 19661990918, free_ts 16331014865 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] kzalloc include/linux/slab.h:711 [inline] kernfs_get_open_node fs/kernfs/file.c:523 [inline] kernfs_fop_open+0x803/0xcd0 fs/kernfs/file.c:691 do_dentry_open+0x907/0x15a0 fs/open.c:956 do_open fs/namei.c:3643 [inline] path_openat+0x2860/0x3240 fs/namei.c:3800 do_filp_open+0x235/0x490 fs/namei.c:3827 do_sys_openat2+0x13e/0x1d0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1433 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 page last free pid 1 tgid 1 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 kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:415 apply_to_pte_range mm/memory.c:2619 [inline] apply_to_pmd_range mm/memory.c:2663 [inline] apply_to_pud_range mm/memory.c:2699 [inline] apply_to_p4d_range mm/memory.c:2735 [inline] __apply_to_page_range+0x8ec/0xe40 mm/memory.c:2769 kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:532 __purge_vmap_area_lazy+0x163f/0x1a10 mm/vmalloc.c:1842 _vm_unmap_aliases+0x7d1/0x870 mm/vmalloc.c:2378 change_page_attr_set_clr+0x2fc/0xf80 arch/x86/mm/pat/set_memory.c:1842 change_page_attr_set arch/x86/mm/pat/set_memory.c:1883 [inline] set_memory_nx+0xf2/0x130 arch/x86/mm/pat/set_memory.c:2071 free_init_pages arch/x86/mm/init.c:927 [inline] free_kernel_image_pages arch/x86/mm/init.c:946 [inline] free_initmem+0x79/0x110 arch/x86/mm/init.c:973 kernel_init+0x31/0x2a0 init/main.c:1455 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Memory state around the buggy address: ffff888022135b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888022135b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888022135c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022135c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888022135d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: c7 c0 f9 ff ff ff mov $0xfffffff9,%eax 6: eb 37 jmp 0x3f 8: e8 44 bf df ff call 0xffdfbf51 d: 49 8d bc ed d0 01 00 lea 0x1d0(%r13,%rbp,8),%rdi 14: 00 15: be 08 00 00 00 mov $0x8,%esi 1a: e8 62 1c 43 00 call 0x431c81 1f: 45 31 ff xor %r15d,%r15d 22: 4d 87 bc ed d0 01 00 xchg %r15,0x1d0(%r13,%rbp,8) 29: 00 * 2a: 4d 85 ff test %r15,%r15 <-- trapping instruction 2d: 0f 85 6b ff ff ff jne 0xffffff9e 33: e8 19 bf df ff call 0xffdfbf51 38: 48 c7 c0 fe ff ff ff mov $0xfffffffffffffffe,%rax 3f: 48 rex.W