================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in has_ns_capability_noaudit+0x1b1/0x1c0 kernel/capability.c:343 Read of size 8 at addr ffff8881955ee468 by task syz-executor.5/27345 CPU: 1 PID: 27345 Comm: syz-executor.5 Not tainted 4.14.150+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 print_address_description+0x60/0x226 mm/kasan/report.c:187 __kasan_report.cold+0x1a/0x41 mm/kasan/report.c:316 __read_once_size include/linux/compiler.h:183 [inline] has_ns_capability_noaudit+0x1b1/0x1c0 kernel/capability.c:343 oom_badness.part.0+0x4ee/0x6b0 mm/oom_kill.c:211 oom_badness+0x35/0x50 mm/oom_kill.c:179 proc_oom_score+0x62/0xb0 fs/proc/base.c:559 proc_single_show+0xf1/0x160 fs/proc/base.c:762 seq_read+0x4f7/0x1180 fs/seq_file.c:237 ip6_tunnel: ó xmit: Local address not yet configured! do_loop_readv_writev fs/read_write.c:699 [inline] do_loop_readv_writev fs/read_write.c:686 [inline] do_iter_read+0x3e8/0x5b0 fs/read_write.c:923 vfs_readv+0xe6/0x150 fs/read_write.c:985 do_preadv+0x189/0x230 fs/read_write.c:1069 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459ef9 RSP: 002b:00007f52683dac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459ef9 RDX: 0000000000000199 RSI: 00000000200017c0 RDI: 0000000000000006 ip6_tunnel: ² xmit: Local address not yet configured! RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52683db6d4 R13: 00000000004c75cc R14: 00000000004dcf78 R15: 00000000ffffffff Allocated by task 27334: save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:501 slab_post_alloc_hook mm/slab.h:439 [inline] slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2800 [inline] kmem_cache_alloc+0xee/0x360 mm/slub.c:2805 kmem_cache_alloc_node include/linux/slab.h:361 [inline] alloc_task_struct_node kernel/fork.c:159 [inline] dup_task_struct kernel/fork.c:525 [inline] copy_process.part.0+0x14f4/0x66c0 kernel/fork.c:1729 copy_process kernel/fork.c:1679 [inline] _do_fork+0x197/0xce0 kernel/fork.c:2220 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 0xffffffffffffffff Freed by task 27358: save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x164/0x210 mm/kasan/common.c:463 slab_free_hook mm/slub.c:1407 [inline] slab_free_freelist_hook mm/slub.c:1458 [inline] slab_free mm/slub.c:3039 [inline] kmem_cache_free+0xd7/0x3b0 mm/slub.c:3055 __put_task_struct+0x295/0x490 kernel/fork.c:430 ip6_tunnel: ò xmit: Local address not yet configured! put_task_struct include/linux/sched/task.h:96 [inline] delayed_put_task_struct+0xb4/0x310 kernel/exit.c:180 __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+0x59f/0xf60 kernel/rcu/tree.c:2946 __do_softirq+0x234/0x9ec kernel/softirq.c:288 The buggy address belongs to the object at ffff8881955ede00 which belongs to the cache task_struct of size 5760 The buggy address is located 1640 bytes inside of 5760-byte region [ffff8881955ede00, ffff8881955ef480) The buggy address belongs to the page: page:ffffea0006557a00 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000000000000 0000000100050005 raw: dead000000000100 dead000000000200 ffff8881da823e00 0000000000000000 ip6_tunnel: ² xmit: Local address not yet configured! page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881955ee300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881955ee380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881955ee400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881955ee480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881955ee500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================