================================================================== BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xcaf/0xd20 net/dns_resolver/dns_key.c:127 Read of size 1 at addr ffff88807e60f234 by task syz-executor.5/18293 CPU: 0 PID: 18293 Comm: syz-executor.5 Not tainted 6.1.71-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+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 dns_resolver_preparse+0xcaf/0xd20 net/dns_resolver/dns_key.c:127 key_create_or_update+0x47b/0xbf0 security/keys/key.c:861 __do_sys_add_key security/keys/keyctl.c:134 [inline] __se_sys_add_key+0x33b/0x480 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f352b07cd29 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:00007f352be280c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f352b1abf80 RCX: 00007f352b07cd29 RDX: 0000000020000340 RSI: 0000000020000400 RDI: 00000000200003c0 RBP: 00007f352b0c947a R08: 000000000bce300e R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f352b1abf80 R15: 00007ffd03b13638 Allocated by task 18293: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0xb3/0x230 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] __do_sys_add_key security/keys/keyctl.c:116 [inline] __se_sys_add_key+0x26c/0x480 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807e60f230 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 4 bytes inside of 8-byte region [ffff88807e60f230, ffff88807e60f238) The buggy address belongs to the physical page: page:ffffea0001f983c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e60f flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888012441280 raw: 0000000000000000 0000000080660066 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 3585, tgid 3585 (syz-executor.1), ts 592405710843, free_ts 592405577883 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] __vmalloc_area_node mm/vmalloc.c:3037 [inline] __vmalloc_node_range+0x5c0/0x1460 mm/vmalloc.c:3223 __vmalloc_node mm/vmalloc.c:3288 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3361 __do_replace+0xbf/0xa70 net/ipv6/netfilter/ip6_tables.c:1065 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x2db8/0x3f60 net/ipv6/netfilter/ip6_tables.c:1638 nf_setsockopt+0x28a/0x2b0 net/netfilter/nf_sockopt.c:101 __sys_setsockopt+0x57e/0xa00 net/socket.c:2269 __do_sys_setsockopt net/socket.c:2280 [inline] __se_sys_setsockopt net/socket.c:2277 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2277 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 __vunmap+0x834/0x9a0 mm/vmalloc.c:2717 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x11df/0x18a0 net/ipv6/netfilter/ip6_tables.c:1671 nf_getsockopt+0x28e/0x2b0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x259/0x370 net/ipv6/ipv6_sockglue.c:1513 tcp_getsockopt+0x15c/0x1c0 net/ipv4/tcp.c:4416 __sys_getsockopt+0x2b2/0x5d0 net/socket.c:2313 __do_sys_getsockopt net/socket.c:2328 [inline] __se_sys_getsockopt net/socket.c:2325 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2325 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807e60f100: fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc fc ffff88807e60f180: fc fc fa fc fc fc fc fb fc fc fc fc fa fc fc fc >ffff88807e60f200: fc fa fc fc fc fc 04 fc fc fc fc fa fc fc fc fc ^ ffff88807e60f280: 05 fc fc fc fc fa fc fc fc fc fa fc fc fc fc 06 ffff88807e60f300: fc fc fc fc 06 fc fc fc fc 06 fc fc fc fc 06 fc ==================================================================