================================================================== BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xcb3/0xd30 net/dns_resolver/dns_key.c:127 Read of size 1 at addr ffff88801e9b7dec by task syz-executor.4/31278 CPU: 1 PID: 31278 Comm: syz-executor.4 Not tainted 6.7.0-rc6-syzkaller-00176-g24e0d2e527a3 #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+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 dns_resolver_preparse+0xcb3/0xd30 net/dns_resolver/dns_key.c:127 __key_create_or_update+0x47f/0xc40 security/keys/key.c:842 key_create_or_update+0x42/0x60 security/keys/key.c:1007 __do_sys_add_key security/keys/keyctl.c:134 [inline] __se_sys_add_key+0x33f/0x480 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f4e0c27cce9 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:00007f4e0cfcf0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f4e0c39bf80 RCX: 00007f4e0c27cce9 RDX: 0000000020000080 RSI: 0000000000000000 RDI: 00000000200003c0 RBP: 00007f4e0c2c947a R08: 0000000026ca637b R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4e0c39bf80 R15: 00007ffefc590578 Allocated by task 31278: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node+0xb3/0x190 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x72/0x180 mm/util.c:617 kvmalloc include/linux/slab.h:738 [inline] __do_sys_add_key security/keys/keyctl.c:116 [inline] __se_sys_add_key+0x270/0x480 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88801e9b7de8 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 [ffff88801e9b7de8, ffff88801e9b7dec) The buggy address belongs to the physical page: page:ffffea00007a6dc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801e9b7208 pfn:0x1e9b7 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888012c41280 ffffea00007fd400 dead000000000002 raw: ffff88801e9b7208 000000008066005c 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 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5156, tgid 5156 (kworker/1:4), ts 198942970473, free_ts 196514244350 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_slab_page+0x6a/0x170 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xc8a/0x1330 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x21d/0x300 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa2/0x1a0 mm/slab_common.c:1020 kmalloc_array include/linux/slab.h:637 [inline] kcalloc include/linux/slab.h:668 [inline] nsim_fib6_event_init drivers/net/netdevsim/fib.c:810 [inline] nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline] nsim_fib_event_nb+0x287/0x10b0 drivers/net/netdevsim/fib.c:1043 notifier_call_chain+0x18c/0x3b0 kernel/notifier.c:93 atomic_notifier_call_chain+0xdb/0x180 kernel/notifier.c:231 call_fib_notifiers+0x31/0x60 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:401 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1223 [inline] fib6_add+0x1b78/0x3d40 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1303 [inline] ip6_ins_rt+0x106/0x170 net/ipv6/route.c:1313 __ipv6_ifa_notify+0x5ca/0x11e0 net/ipv6/addrconf.c:6213 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 discard_slab mm/slub.c:2116 [inline] __unfreeze_partials+0x1e0/0x220 mm/slub.c:2655 put_cpu_partial+0x17b/0x250 mm/slub.c:2731 __slab_free+0x2b6/0x390 mm/slub.c:3679 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6c/0x3c0 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x19e/0x2b0 mm/slub.c:3502 alloc_pid+0xa0/0xc50 kernel/pid.c:183 copy_process+0x2295/0x3fb0 kernel/fork.c:2518 kernel_clone+0x222/0x840 kernel/fork.c:2907 __do_sys_clone kernel/fork.c:3050 [inline] __se_sys_clone kernel/fork.c:3034 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88801e9b7c80: fa fc fc fc fc fa fc fc fc fc fa fc fc fc fc 06 ffff88801e9b7d00: fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc >ffff88801e9b7d80: fc fc fc 07 fc fc fc fc fa fc fc fc fc 04 fc fc ^ ffff88801e9b7e00: fc fc fa fc fc fc fc 03 fc fc fc fc fa fc fc fc ffff88801e9b7e80: fc fa fc fc fc fc fa fc fc fc fc fb fc fc fc fc ==================================================================