RBP: 000000000000d341 R08: 00000000ffffffff R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402360 R13: 00000000004023f0 R14: 0000000000000000 R15: 0000000000000000 proc_fill_super: allocate dentry failed ================================================================== BUG: KASAN: use-after-free in put_pid_ns+0x100/0x110 kernel/pid_namespace.c:202 Read of size 8 at addr ffff88809977b510 by task syz-executor316/7239 CPU: 1 PID: 7239 Comm: syz-executor316 Not tainted 4.14.138 #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 put_pid_ns+0x100/0x110 kernel/pid_namespace.c:202 free_nsproxy+0x103/0x200 kernel/nsproxy.c:182 switch_task_namespaces+0x98/0xb0 kernel/nsproxy.c:229 exit_task_namespaces+0x18/0x20 kernel/nsproxy.c:234 copy_process.part.0+0x3b59/0x6a00 kernel/fork.c:1986 copy_process kernel/fork.c:1595 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2085 SYSC_clone kernel/fork.c:2195 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2189 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441549 RSP: 002b:00007ffc71bf82a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441549 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 88bd14a7b286b957 RBP: 000000000000d337 R08: 00000000ffffffff R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402360 R13: 00000000004023f0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7239: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 kmem_cache_zalloc include/linux/slab.h:651 [inline] create_pid_namespace kernel/pid_namespace.c:116 [inline] copy_pid_ns+0x1ae/0xa40 kernel/pid_namespace.c:186 create_new_namespaces+0x267/0x720 kernel/nsproxy.c:94 copy_namespaces+0x284/0x310 kernel/nsproxy.c:165 copy_process.part.0+0x2603/0x6a00 kernel/fork.c:1783 copy_process kernel/fork.c:1595 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2085 SYSC_clone kernel/fork.c:2195 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2189 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 7: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 delayed_free_pidns+0x89/0xb0 kernel/pid_namespace.c:166 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x7b8/0x12b0 kernel/rcu/tree.c:2946 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 The buggy address belongs to the object at ffff88809977acd8 which belongs to the cache pid_namespace of size 2264 The buggy address is located 2104 bytes inside of 2264-byte region [ffff88809977acd8, ffff88809977b5b0) The buggy address belongs to the page: page:ffffea000265de80 count:1 mapcount:0 mapping:ffff88809977a380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff88809977a380 0000000000000000 0000000100000003 raw: ffffea000264f220 ffffea0002647aa0 ffff8880a87f2640 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809977b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809977b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809977b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809977b580: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88809977b600: fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb ==================================================================