================================================================== 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 ffff88816864916c by task syz-executor.4/794 CPU: 0 PID: 794 Comm: syz-executor.4 Not tainted 6.1.70-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: 0033:0x7feff367cce9 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:00007feff44310c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007feff379bf80 RCX: 00007feff367cce9 RDX: 0000000020000080 RSI: 0000000020000400 RDI: 0000000020000380 RBP: 00007feff36c947a R08: 000000002585962a R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007feff379bf80 R15: 00007ffe3d3702f8 Allocated by task 794: 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 ffff888168649168 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 4 bytes inside of 8-byte region [ffff888168649168, ffff888168649170) The buggy address belongs to the physical page: page:ffffea0005a19240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x168649 flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000000200 ffffea0005cc7a40 dead000000000002 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 31184, tgid 31181 (syz-executor.5), ts 2554388303278, free_ts 2225947070279 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_track_caller+0xa0/0x220 mm/slab_common.c:975 kvasprintf+0xdb/0x180 lib/kasprintf.c:25 kobject_set_name_vargs+0x5d/0x110 lib/kobject.c:265 kobject_add_varg lib/kobject.c:360 [inline] kobject_init_and_add+0xda/0x190 lib/kobject.c:449 netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline] netdev_queue_update_kobjects+0x1f2/0x480 net/core/net-sysfs.c:1718 register_queue_kobjects net/core/net-sysfs.c:1779 [inline] netdev_register_kobject+0x263/0x310 net/core/net-sysfs.c:2019 register_netdevice+0x108a/0x1720 net/core/dev.c:10096 bond_newlink+0x37/0x80 drivers/net/bonding/bond_netlink.c:565 rtnl_newlink_create net/core/rtnetlink.c:3390 [inline] __rtnl_newlink net/core/rtnetlink.c:3610 [inline] rtnl_newlink+0x14e3/0x2050 net/core/rtnetlink.c:3623 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 bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:151 [inline] bpf_ringbuf_alloc+0x3a2/0x420 kernel/bpf/ringbuf.c:167 ringbuf_map_alloc+0x1cf/0x2f0 kernel/bpf/ringbuf.c:207 find_and_alloc_map kernel/bpf/syscall.c:131 [inline] map_create+0x4c0/0xd20 kernel/bpf/syscall.c:1106 __sys_bpf+0x2d3/0x6c0 kernel/bpf/syscall.c:4950 __do_sys_bpf kernel/bpf/syscall.c:5072 [inline] __se_sys_bpf kernel/bpf/syscall.c:5070 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5070 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: ffff888168649000: 06 fc fc fc fc 06 fc fc fc fc 06 fc fc fc fc 06 ffff888168649080: fc fc fc fc fa fc fc fc fc 00 fc fc fc fc fa fc >ffff888168649100: fc fc fc 05 fc fc fc fc 05 fc fc fc fc 04 fc fc ^ ffff888168649180: fc fc fb fc fc fc fc fb fc fc fc fc fb fc fc fc ffff888168649200: fc fb fc fc fc fc fa fc fc fc fc fb fc fc fc fc ==================================================================