RBP: 00007f3a7d1fd090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f3a7c5b6080 R15: 00007fff8681bcf8 ================================================================== BUG: KASAN: slab-use-after-free in free_prog kernel/trace/trace_events_filter.c:1288 [inline] BUG: KASAN: slab-use-after-free in __free_filter.part.0+0x153/0x160 kernel/trace/trace_events_filter.c:1312 Read of size 8 at addr ffff888028741560 by task syz.2.2964/20263 CPU: 0 UID: 0 PID: 20263 Comm: syz.2.2964 Tainted: G U 6.16.0-rc3-syzkaller #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xcd/0x680 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 free_prog kernel/trace/trace_events_filter.c:1288 [inline] __free_filter.part.0+0x153/0x160 kernel/trace/trace_events_filter.c:1312 __free_filter kernel/trace/trace_events_filter.c:1309 [inline] filter_free_subsystem_filters kernel/trace/trace_events_filter.c:1470 [inline] apply_subsystem_event_filter+0x1487/0x17a0 kernel/trace/trace_events_filter.c:2512 subsystem_filter_write+0x95/0x120 kernel/trace/trace_events.c:2304 vfs_write+0x2a0/0x1150 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3a7c38e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3a7d1fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3a7c5b6080 RCX: 00007f3a7c38e929 RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f3a7d1fd090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f3a7c5b6080 R15: 00007fff8681bcf8 Allocated by task 19443: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] create_filter_start.constprop.0+0xa5/0x300 kernel/trace/trace_events_filter.c:2334 create_system_filter kernel/trace/trace_events_filter.c:2426 [inline] apply_subsystem_event_filter+0x18d/0x17a0 kernel/trace/trace_events_filter.c:2516 subsystem_filter_write+0x95/0x120 kernel/trace/trace_events.c:2304 vfs_write+0x2a0/0x1150 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 20263: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x2b4/0x4d0 mm/slub.c:4842 __free_filter kernel/trace/trace_events_filter.c:1309 [inline] free_filter_list+0xa5/0x240 kernel/trace/trace_events_filter.c:1357 filter_free_subsystem_filters kernel/trace/trace_events_filter.c:1463 [inline] apply_subsystem_event_filter+0x12be/0x17a0 kernel/trace/trace_events_filter.c:2512 subsystem_filter_write+0x95/0x120 kernel/trace/trace_events.c:2304 vfs_write+0x2a0/0x1150 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888028741560 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of freed 16-byte region [ffff888028741560, ffff888028741570) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28741 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b841640 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000800080 00000000f5000000 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 5867, tgid 5867 (syz-executor), ts 378433434547, free_ts 378433374299 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_slab_page mm/slub.c:2453 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x94/0x330 mm/slub.c:2673 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x3b1/0x620 mm/slub.c:5015 xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline] xt_replace_table+0x1e3/0x950 net/netfilter/x_tables.c:1394 __do_replace+0x1cf/0x9e0 net/ipv4/netfilter/ip_tables.c:1064 do_replace net/ipv4/netfilter/ip_tables.c:1141 [inline] do_ipt_set_ctl+0x7f7/0xa60 net/ipv4/netfilter/ip_tables.c:1635 nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4108 do_sock_setsockopt+0x221/0x470 net/socket.c:2296 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321 __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 page last free pid 5867 tgid 5867 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706 ___free_pages_bulk mm/kasan/shadow.c:332 [inline] __kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline] kasan_populate_vmalloc+0x18c/0x1f0 mm/kasan/shadow.c:417 alloc_vmap_area+0x959/0x29c0 mm/vmalloc.c:2084 __get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3179 __vmalloc_node_range_noprof+0x271/0x14b0 mm/vmalloc.c:3845 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3948 xt_counters_alloc+0x4c/0x70 net/netfilter/x_tables.c:1380 __do_replace+0x97/0x9e0 net/ipv4/netfilter/ip_tables.c:1046 do_replace net/ipv4/netfilter/ip_tables.c:1141 [inline] do_ipt_set_ctl+0x7f7/0xa60 net/ipv4/netfilter/ip_tables.c:1635 nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4108 do_sock_setsockopt+0x221/0x470 net/socket.c:2296 __sys_setsockopt+0x120/0x1a0 net/socket.c:2321 __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 Memory state around the buggy address: ffff888028741400: 00 00 fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc ffff888028741480: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc >ffff888028741500: 00 00 fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc ^ ffff888028741580: 00 00 fc fc 00 03 fc fc 00 00 fc fc 00 00 fc fc ffff888028741600: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 03 fc fc ==================================================================