================================================================== BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x132/0x320 mm/vmalloc.c:4093 Write of size 4064 at addr ffffc9000ef02020 by task syz.3.2473/14987 CPU: 1 UID: 0 PID: 14987 Comm: syz.3.2473 Not tainted 6.15.0-rc2-syzkaller-00400-g3088d26962e8 #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 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+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 vrealloc_noprof+0x132/0x320 mm/vmalloc.c:4093 push_insn_history+0x2ae/0x6c0 kernel/bpf/verifier.c:3874 do_check kernel/bpf/verifier.c:19450 [inline] do_check_common+0xbd3/0xc2a0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x7f51/0xb460 kernel/bpf/verifier.c:24033 bpf_prog_load+0xe41/0x2490 kernel/bpf/syscall.c:2971 __sys_bpf+0x433c/0x4d80 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5939 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f77579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f509655c EFLAGS: 00000296 ORIG_RAX: 0000000000000165 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000800017c0 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the virtual mapping at [ffffc9000eee2000, ffffc9000ef04000) created by: kvrealloc_noprof+0x7d/0xd0 mm/slub.c:5123 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x442 pfn:0x6e392 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000442 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 14987, tgid 14986 (syz.3.2473), ts 481706716950, free_ts 481625136496 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x135c/0x3920 mm/page_alloc.c:3700 __alloc_pages_slowpath mm/page_alloc.c:4521 [inline] __alloc_frozen_pages_noprof+0x5a8/0x23a0 mm/page_alloc.c:4995 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2301 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] alloc_pages_noprof+0x131/0x390 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+0x732/0x1540 mm/vmalloc.c:3844 __kvmalloc_node_noprof+0x2ff/0x600 mm/slub.c:5048 kvrealloc_noprof+0x7d/0xd0 mm/slub.c:5123 push_insn_history+0x2ae/0x6c0 kernel/bpf/verifier.c:3874 do_check kernel/bpf/verifier.c:19450 [inline] do_check_common+0xbd3/0xc2a0 kernel/bpf/verifier.c:22776 do_check_main kernel/bpf/verifier.c:22867 [inline] bpf_check+0x7f51/0xb460 kernel/bpf/verifier.c:24033 bpf_prog_load+0xe41/0x2490 kernel/bpf/syscall.c:2971 __sys_bpf+0x433c/0x4d80 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0x76/0xe0 kernel/bpf/syscall.c:5939 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 page last free pid 5949 tgid 5949 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] free_unref_folios+0x999/0x1630 mm/page_alloc.c:2782 shrink_folio_list+0x3255/0x40e0 mm/vmscan.c:1552 evict_folios+0x779/0x1b60 mm/vmscan.c:4698 try_to_shrink_lruvec+0x5a3/0x990 mm/vmscan.c:4859 shrink_one+0x3e3/0x7a0 mm/vmscan.c:4904 shrink_many mm/vmscan.c:4967 [inline] lru_gen_shrink_node mm/vmscan.c:5045 [inline] shrink_node+0x268e/0x3d20 mm/vmscan.c:6016 shrink_zones mm/vmscan.c:6274 [inline] do_try_to_free_pages+0x362/0x1920 mm/vmscan.c:6336 try_to_free_pages+0x2a1/0x690 mm/vmscan.c:6582 __perform_reclaim mm/page_alloc.c:4152 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4174 [inline] __alloc_pages_slowpath mm/page_alloc.c:4615 [inline] __alloc_frozen_pages_noprof+0x9fb/0x23a0 mm/page_alloc.c:4995 __alloc_pages_noprof mm/page_alloc.c:5016 [inline] alloc_pages_bulk_noprof+0x703/0x13b0 mm/page_alloc.c:4936 alloc_pages_bulk_mempolicy_noprof+0x244/0x1200 mm/mempolicy.c:2606 vm_area_alloc_pages mm/vmalloc.c:3565 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x529/0x1540 mm/vmalloc.c:3844 __vmalloc_node_noprof mm/vmalloc.c:3907 [inline] vmalloc_noprof+0x6b/0x90 mm/vmalloc.c:3940 xt_compat_init_offsets+0xe6/0x1f0 net/netfilter/x_tables.c:733 compat_table_info+0xb8/0x510 net/ipv4/netfilter/arp_tables.c:779 get_info+0x26f/0x620 net/ipv4/netfilter/arp_tables.c:816 Memory state around the buggy address: ffffc9000ef01f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc9000ef01f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000ef02000: 00 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000ef02080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000ef02100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi