================================================================== BUG: KASAN: slab-use-after-free in consumer_filter kernel/events/uprobes.c:869 [inline] BUG: KASAN: slab-use-after-free in filter_chain kernel/events/uprobes.c:880 [inline] BUG: KASAN: slab-use-after-free in uprobe_mmap+0xb9a/0x11a0 kernel/events/uprobes.c:1368 Read of size 8 at addr ffff88804c402fb8 by task syz.3.610/7535 CPU: 1 UID: 0 PID: 7535 Comm: syz.3.610 Not tainted 6.11.0-rc3-next-20240816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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 consumer_filter kernel/events/uprobes.c:869 [inline] filter_chain kernel/events/uprobes.c:880 [inline] uprobe_mmap+0xb9a/0x11a0 kernel/events/uprobes.c:1368 mmap_region+0x16ec/0x20a0 mm/mmap.c:1569 do_mmap+0x8f9/0x1010 mm/mmap.c:495 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:541 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 RIP: 0033:0x7fc891979e79 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:00007fc8927fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fc891b15f80 RCX: 00007fc891979e79 RDX: 0000000000000001 RSI: 0000000000004000 RDI: 0000000020000000 RBP: 00007fc8919e7916 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc891b15f80 R15: 00007ffe01646f88 Allocated by task 6806: 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] __do_kmalloc_node mm/slub.c:4202 [inline] __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4208 __kvmalloc_node_noprof+0x72/0x1b0 mm/util.c:658 kvmalloc_array_node_noprof include/linux/slab.h:835 [inline] bpf_uprobe_multi_link_attach+0x43e/0xb90 kernel/trace/bpf_trace.c:3369 link_create+0x6e9/0x870 kernel/bpf/syscall.c:5236 __sys_bpf+0x4bc/0x810 kernel/bpf/syscall.c:5697 __do_sys_bpf kernel/bpf/syscall.c:5734 [inline] __se_sys_bpf kernel/bpf/syscall.c:5732 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5732 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 6806: 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 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:2295 [inline] slab_free mm/slub.c:4517 [inline] kfree+0x196/0x3e0 mm/slub.c:4665 bpf_uprobe_multi_link_attach+0xa7d/0xb90 kernel/trace/bpf_trace.c:3431 link_create+0x6e9/0x870 kernel/bpf/syscall.c:5236 __sys_bpf+0x4bc/0x810 kernel/bpf/syscall.c:5697 __do_sys_bpf kernel/bpf/syscall.c:5734 [inline] __se_sys_bpf kernel/bpf/syscall.c:5732 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5732 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 The buggy address belongs to the object at ffff88804c402f80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 56 bytes inside of freed 96-byte region [ffff88804c402f80, ffff88804c402fe0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804c402c80 pfn:0x4c402 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000200 ffff888015841280 ffffea0000917fd0 ffffea0001ef4e50 raw: ffff88804c402c80 000000000020000f 00000001fdffffff 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5277, tgid 5277 (kworker/0:5), ts 66354645314, free_ts 66296306186 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1518 prep_new_page mm/page_alloc.c:1526 [inline] get_page_from_freelist+0x3004/0x30c0 mm/page_alloc.c:3477 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4744 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2364 allocate_slab+0x5a/0x2f0 mm/slub.c:2527 new_slab mm/slub.c:2580 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3767 __slab_alloc+0x58/0xa0 mm/slub.c:3857 __slab_alloc_node mm/slub.c:3910 [inline] slab_alloc_node mm/slub.c:4069 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4228 kmalloc_noprof include/linux/slab.h:681 [inline] dst_cow_metrics_generic+0x56/0x1c0 net/core/dst.c:178 dst_metrics_write_ptr include/net/dst.h:133 [inline] dst_metric_set include/net/dst.h:194 [inline] icmp6_dst_alloc+0x270/0x420 net/ipv6/route.c:3288 mld_sendpack+0x6a3/0xdb0 net/ipv6/mcast.c:1807 mld_send_cr net/ipv6/mcast.c:2119 [inline] mld_ifc_work+0x7d9/0xd90 net/ipv6/mcast.c:2650 process_one_work kernel/workqueue.c:3232 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 page last free pid 5305 tgid 5305 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1099 [inline] free_unref_folios+0xe5c/0x1780 mm/page_alloc.c:2700 folios_put_refs+0x76e/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __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+0x496/0xc40 mm/mmap.c:1934 __mmput+0x115/0x390 kernel/fork.c:1347 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 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 Memory state around the buggy address: ffff88804c402e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88804c402f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88804c402f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88804c403000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804c403080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================