================================================================== BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xa12/0xb50 net/dns_resolver/dns_key.c:127 Read of size 1 at addr ffff88810329270c by task syz-executor.0/1864 CPU: 1 PID: 1864 Comm: syz-executor.0 Not tainted 6.7.0-rc5-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+0x3d/0x60 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 dns_resolver_preparse+0xa12/0xb50 net/dns_resolver/dns_key.c:127 __key_create_or_update+0x3c4/0xa90 security/keys/key.c:842 key_create_or_update+0xf/0x20 security/keys/key.c:1007 __do_sys_add_key+0x1be/0x310 security/keys/keyctl.c:134 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0xe0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f1e2ecd4ba9 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:00007f1e2e8570c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8 RAX: ffffffffffffffda RBX: 00007f1e2edf3f80 RCX: 00007f1e2ecd4ba9 RDX: 0000000020000080 RSI: 0000000000000000 RDI: 00000000200003c0 RBP: 00007f1e2ed2047a R08: 0000000006b67e5a R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f1e2edf3f80 R15: 00007ffc2bd66178 Allocated by task 1864: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node+0x63/0x160 mm/slab_common.c:1014 kvmalloc include/linux/slab.h:738 [inline] __do_sys_add_key+0x149/0x310 security/keys/keyctl.c:116 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0xe0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff888103292708 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 [ffff888103292708, ffff88810329270c) The buggy address belongs to the physical page: page:ffffea00040ca480 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888103292fc8 pfn:0x103292 flags: 0x200000000000800(slab|node=0|zone=2) page_type: 0xffffffff() raw: 0200000000000800 ffff888100041280 ffffea00042d9440 0000000000000002 raw: ffff888103292fc8 0000000080660065 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 731, tgid 731 (udevadm), ts 4287116703, free_ts 3320237610 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x27f/0x2f0 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xeb8/0x36a0 mm/page_alloc.c:3312 __alloc_pages+0x342/0x5e0 mm/page_alloc.c:4568 alloc_pages_mpol+0xbf/0x370 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x24b/0x360 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8ce/0x10e0 mm/slub.c:3223 __slab_alloc.constprop.0+0x4d/0x90 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x150/0x350 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x4f/0x160 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kernfs_fop_write_iter+0x1bd/0x510 fs/kernfs/file.c:311 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x51f/0xc70 fs/read_write.c:584 ksys_write+0xf6/0x1d0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0xe0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b 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+0x562/0xbd0 mm/page_alloc.c:2347 free_unref_page+0x33/0x2a0 mm/page_alloc.c:2487 vfree mm/vmalloc.c:2842 [inline] vfree+0x27c/0x9c0 mm/vmalloc.c:2807 delayed_vfree_work+0x4a/0x70 mm/vmalloc.c:2763 process_one_work+0x72e/0x11b0 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x6b3/0x1080 kernel/workqueue.c:2781 kthread+0x278/0x330 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 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: ffff888103292600: fc fc fc fb fc fc fc fc fb fc fc fc fc fb fc fc ffff888103292680: fc fc fb fc fc fc fc fb fc fc fc fc fb fc fc fc >ffff888103292700: fc 04 fc fc fc fc 05 fc fc fc fc fa fc fc fc fc ^ ffff888103292780: fa fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa ffff888103292800: fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc ==================================================================