netlink: 8 bytes leftover after parsing attributes in process `syz.0.0'. ================================================================== BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x396/0x430 mm/vmalloc.c:4093 Write of size 4064 at addr ffffc9000d661020 by task syz.0.0/5324 CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xb4/0x290 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x29a/0x2b0 mm/kasan/generic.c:189 __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 vrealloc_noprof+0x396/0x430 mm/vmalloc.c:4093 push_insn_history+0x184/0x650 kernel/bpf/verifier.c:3874 do_check+0x597/0xd630 kernel/bpf/verifier.c:19450 do_check_common+0x168d/0x20b0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x13679/0x19a70 kernel/bpf/verifier.c:24033 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2971 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f923758e969 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:00007f92339f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f92377b5fa0 RCX: 00007f923758e969 RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005 RBP: 00007f9237610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f92377b5fa0 R15: 00007ffc9aa4c318 The buggy address belongs to the virtual mapping at [ffffc9000d641000, ffffc9000d663000) created by: kvrealloc_noprof+0x82/0xe0 mm/slub.c:5123 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x1d5a pfn:0x46d90 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000001d5a 0000000000000000 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 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN), pid 5324, tgid 5323 (syz.0.0), ts 70639219856, free_ts 70616096183 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688 __alloc_pages_slowpath+0x2fe/0xcc0 mm/page_alloc.c:4509 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:4983 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2392 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x8fe/0x12c0 mm/vmalloc.c:3844 __kvmalloc_node_noprof+0x3a0/0x5e0 mm/slub.c:5048 kvrealloc_noprof+0x82/0xe0 mm/slub.c:5123 push_insn_history+0x184/0x650 kernel/bpf/verifier.c:3874 do_check+0x597/0xd630 kernel/bpf/verifier.c:19450 do_check_common+0x168d/0x20b0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x13679/0x19a70 kernel/bpf/verifier.c:24033 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2971 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939 page last free pid 5324 tgid 5323 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] free_unref_folios+0xb81/0x14a0 mm/page_alloc.c:2782 shrink_folio_list+0x3053/0x4e90 mm/vmscan.c:1552 evict_folios+0x417b/0x5110 mm/vmscan.c:4698 try_to_shrink_lruvec+0x705/0x990 mm/vmscan.c:4859 shrink_one+0x21b/0x7c0 mm/vmscan.c:4904 shrink_many mm/vmscan.c:4967 [inline] lru_gen_shrink_node mm/vmscan.c:5045 [inline] shrink_node+0x3139/0x3750 mm/vmscan.c:6016 shrink_zones mm/vmscan.c:6274 [inline] do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6336 try_to_free_pages+0x8a2/0xdd0 mm/vmscan.c:6582 __perform_reclaim mm/page_alloc.c:4140 [inline] __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4162 __alloc_pages_slowpath+0x5d6/0xcc0 mm/page_alloc.c:4603 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:4983 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0xe2/0x3b0 mm/slub.c:2640 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3872 __slab_alloc mm/slub.c:3962 [inline] __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4360 __do_krealloc mm/slub.c:4918 [inline] krealloc_noprof+0x122/0x330 mm/slub.c:4971 Memory state around the buggy address: ffffc9000d660f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000d660f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000d661000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000d661080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000d661100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 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