================================================================== 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 ffff888028894084 by task syz-executor265/5069 CPU: 0 PID: 5069 Comm: syz-executor265 Not tainted 6.7.0-rc5-next-20231213-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 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: 0033:0x7fd37f34f2e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2f4f3198 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007fff2f4f3368 RCX: 00007fd37f34f2e9 RDX: 0000000020000080 RSI: 0000000000000000 RDI: 00000000200003c0 RBP: 00007fd37f3c2610 R08: 0000000002853c32 R09: 00007fff2f4f3368 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff2f4f3358 R14: 0000000000000001 R15: 0000000000000001 Allocated by task 5069: 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:617 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 ffff888028894080 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 [ffff888028894080, ffff888028894084) The buggy address belongs to the physical page: page:ffffea0000a22500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28894 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888013041280 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080800080 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 1, tgid 1 (swapper/0), ts 27978623390, free_ts 27978121808 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 kvasprintf_const+0x10b/0x190 lib/kasprintf.c:48 kobject_set_name_vargs+0x5a/0x130 lib/kobject.c:272 kobject_add_varg lib/kobject.c:366 [inline] kobject_init_and_add+0xe8/0x190 lib/kobject.c:455 locate_module_kobject+0xef/0x190 kernel/params.c:781 kernel_add_sysfs_param kernel/params.c:808 [inline] param_sysfs_builtin kernel/params.c:856 [inline] param_sysfs_builtin_init+0x25f/0x450 kernel/params.c:990 do_one_initcall+0x128/0x680 init/main.c:1236 page last free pid 3062 tgid 3062 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 mm_free_pgd kernel/fork.c:799 [inline] __mmdrop+0xd5/0x470 kernel/fork.c:915 mmdrop include/linux/sched/mm.h:54 [inline] __mmput+0x40a/0x4d0 kernel/fork.c:1352 mmput+0x62/0x70 kernel/fork.c:1363 free_bprm+0x143/0x3e0 fs/exec.c:1490 kernel_execve+0x3e6/0x4e0 fs/exec.c:2036 call_usermodehelper_exec_async+0x252/0x4c0 kernel/umh.c:110 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff888028893f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888028894000: 07 fc fc fc 07 fc fc fc fa fc fc fc 05 fc fc fc >ffff888028894080: 04 fc fc fc fb fc fc fc fb fc fc fc 06 fc fc fc ^ ffff888028894100: 06 fc fc fc fb fc fc fc 00 fc fc fc 00 fc fc fc ffff888028894180: fb fc fc fc 04 fc fc fc 04 fc fc fc fb fc fc fc ==================================================================