================================================================== BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127 Read of size 1 at addr ffff8880226e4c64 by task syz-executor.2/31699 CPU: 0 PID: 31699 Comm: syz-executor.2 Not tainted 6.7.0-rc6-next-20231222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 dns_resolver_preparse+0xc9f/0xd60 net/dns_resolver/dns_key.c:127 __key_create_or_update+0x453/0xdf0 security/keys/key.c:842 key_create_or_update+0x42/0x50 security/keys/key.c:1007 __do_sys_add_key+0x29c/0x450 security/keys/keyctl.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f0881a7cce9 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:00007f088286c0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f0881b9bf80 RCX: 00007f0881a7cce9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 00000000200003c0 RBP: 00007f0881ac947a R08: 000000001c5758e0 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0881b9bf80 R15: 00007ffebc2994e8 Allocated by task 31699: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_set_track+0x24/0x30 mm/kasan/common.c:61 poison_kmalloc_redzone mm/kasan/common.c:340 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:357 kasan_kmalloc include/linux/kasan.h:210 [inline] __do_kmalloc_node mm/slub.c:3985 [inline] __kmalloc_node+0x226/0x480 mm/slub.c:3992 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:634 kvmalloc include/linux/slab.h:728 [inline] __do_sys_add_key+0x1f8/0x450 security/keys/keyctl.c:116 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a The buggy address belongs to the object at ffff8880226e4c60 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 4-byte region [ffff8880226e4c60, ffff8880226e4c64) The buggy address belongs to the physical page: page:ffffea000089b900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x226e4 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888013041280 ffffea0000832280 dead000000000004 raw: 0000000000000000 00000000802a002a 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5088, tgid 5088 (syz-executor.0), ts 442397999147, free_ts 442397804753 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa19/0x3740 mm/page_alloc.c:3348 __alloc_pages+0x22e/0x2410 mm/page_alloc.c:4604 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:2191 [inline] allocate_slab mm/slub.c:2358 [inline] new_slab+0x283/0x3c0 mm/slub.c:2411 ___slab_alloc+0x4ab/0x1990 mm/slub.c:3544 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3629 __slab_alloc_node mm/slub.c:3682 [inline] slab_alloc_node mm/slub.c:3854 [inline] __do_kmalloc_node mm/slub.c:3984 [inline] __kmalloc_node+0x36e/0x480 mm/slub.c:3992 kmalloc_node include/linux/slab.h:610 [inline] __vmalloc_area_node mm/vmalloc.c:3125 [inline] __vmalloc_node_range+0x3e8/0x1530 mm/vmalloc.c:3320 __vmalloc_node mm/vmalloc.c:3385 [inline] vzalloc+0x6b/0x80 mm/vmalloc.c:3458 xt_counters_alloc+0x4c/0x70 net/netfilter/x_tables.c:1379 __do_replace+0x9a/0x9c0 net/ipv4/netfilter/arp_tables.c:894 do_replace net/ipv6/netfilter/ip6_tables.c:1154 [inline] do_ip6t_set_ctl+0x954/0xbf0 net/ipv6/netfilter/ip6_tables.c:1636 nf_setsockopt+0x87/0xe0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x12b/0x190 net/ipv6/ipv6_sockglue.c:997 tcp_setsockopt+0x9d/0x100 net/ipv4/tcp.c:3723 page last free pid 5088 tgid 5088 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+0x51f/0xb10 mm/page_alloc.c:2383 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2523 vfree+0x181/0x7a0 mm/vmalloc.c:2842 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0x8e8/0xae0 net/ipv6/netfilter/ip6_tables.c:1669 nf_getsockopt+0x76/0xe0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x1f9/0x2b0 net/ipv6/ipv6_sockglue.c:1488 tcp_getsockopt+0x97/0xf0 net/ipv4/tcp.c:4361 do_sock_getsockopt+0x2e1/0x6c0 net/socket.c:2371 __sys_getsockopt+0x1a1/0x270 net/socket.c:2400 __do_sys_getsockopt net/socket.c:2410 [inline] __se_sys_getsockopt net/socket.c:2407 [inline] __x64_sys_getsockopt+0xbd/0x150 net/socket.c:2407 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a Memory state around the buggy address: ffff8880226e4b00: fc fc fc fc fc fc fc fc fa fc fc fc fc fc fc fc ffff8880226e4b80: fc fc fc fc fb fc fc fc fc fc fc fc fc fc fc fc >ffff8880226e4c00: fb fc fc fc fc fc fc fc fc fc fc fc 04 fc fc fc ^ ffff8880226e4c80: fc fc fc fc fc fc fc fc fb fc fc fc fc fc fc fc ffff8880226e4d00: fc fc fc fc fa fc fc fc fc fc fc fc fc fc fc fc 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