================================================================== 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 ffff88801af36b24 by task syz-executor.3/7309 CPU: 1 PID: 7309 Comm: syz-executor.3 Not tainted 6.7.0-rc6-next-20231219-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: 0033:0x7f0c7027cbe9 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:00007f0c70f120c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f0c7039bf80 RCX: 00007f0c7027cbe9 RDX: 0000000020000040 RSI: 0000000020000400 RDI: 00000000200003c0 RBP: 00007f0c702c847a R08: 000000003a64eeae R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f0c7039bf80 R15: 00007ffe73fe7578 Allocated by task 7309: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_set_track+0x24/0x30 mm/kasan/common.c:61 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:198 [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 ffff88801af36b20 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 [ffff88801af36b20, ffff88801af36b24) The buggy address belongs to the physical page: page:ffffea00006bcd80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801af36820 pfn:0x1af36 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888013041280 ffffea0000cf0180 dead000000000002 raw: ffff88801af36820 000000008080007f 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5100, tgid 5100 (syz-executor.1), ts 220331902675, free_ts 220262268500 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1540 prep_new_page mm/page_alloc.c:1547 [inline] get_page_from_freelist+0xa19/0x3740 mm/page_alloc.c:3355 __alloc_pages+0x22e/0x2410 mm/page_alloc.c:4611 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_track_caller+0x367/0x470 mm/slub.c:4005 kstrdup+0x3c/0x70 mm/util.c:62 kstrdup_const+0x5f/0x70 mm/util.c:85 __kernfs_new_node+0x9c/0x890 fs/kernfs/dir.c:611 kernfs_new_node+0x18c/0x240 fs/kernfs/dir.c:691 kernfs_create_dir_ns+0x4c/0x150 fs/kernfs/dir.c:1052 sysfs_create_dir_ns+0x13b/0x2b0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x2c8/0x970 lib/kobject.c:238 kobject_add_varg lib/kobject.c:372 [inline] kobject_init_and_add+0x11c/0x190 lib/kobject.c:455 page last free pid 5158 tgid 5158 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:2390 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2530 __put_partials+0x14c/0x160 mm/slub.c:2926 qlink_free mm/kasan/quarantine.c:178 [inline] qlist_free_all+0xc1/0x1e0 mm/kasan/quarantine.c:194 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:301 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slub.c:3817 [inline] slab_alloc_node mm/slub.c:3864 [inline] __do_kmalloc_node mm/slub.c:3984 [inline] __kmalloc+0x1bd/0x440 mm/slub.c:3998 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1eb0 net/ipv6/route.c:3749 ip6_route_add+0x26/0x190 net/ipv6/route.c:3843 addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2509 addrconf_add_dev+0x146/0x1c0 net/ipv6/addrconf.c:2527 addrconf_dev_config net/ipv6/addrconf.c:3431 [inline] addrconf_init_auto_addrs+0x380/0x820 net/ipv6/addrconf.c:3518 addrconf_notify+0x6e2/0x19c0 net/ipv6/addrconf.c:3691 notifier_call_chain+0xb6/0x3d0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x130 net/core/dev.c:1966 Memory state around the buggy address: ffff88801af36a00: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff88801af36a80: fa fc fc fc fb fc fc fc fb fc fc fc fa fc fc fc >ffff88801af36b00: fa fc fc fc 04 fc fc fc fa fc fc fc fa fc fc fc ^ ffff88801af36b80: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff88801af36c00: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ==================================================================