security_file_alloc+0x40/0x90 security/security.c:880 __alloc_file+0xc9/0x330 fs/file_table.c:105 alloc_empty_file+0x6d/0x170 fs/file_table.c:150 ================================================================== path_openat+0xe9/0x2df0 fs/namei.c:3526 BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 Read of size 8 at addr ffff8880a84ee438 by task syz-executor.5/19150 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4179b1 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 6a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f91a79cba20 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00000000004179b1 RDX: 00000000000001f6 RSI: 0000000000000002 RDI: 00007f91a79cbae0 RBP: 0000000000000000 R08: 0000000020000218 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000006 R14: 0000000000000006 R15: 0000000020000228 CPU: 0 PID: 19150 Comm: syz-executor.5 Not tainted 4.19.159-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51 squashfs_new_inode fs/squashfs/inode.c:68 [inline] squashfs_read_inode+0x1ee/0x1b40 fs/squashfs/inode.c:133 squashfs_fill_super+0x1655/0x1c00 fs/squashfs/super.c:318 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46090a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fda8f298a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fda8f298b20 RCX: 000000000046090a RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007fda8f298ae0 RBP: 00007fda8f298ae0 R08: 00007fda8f298b20 R09: 0000000020000040 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000040 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000240 Allocated by task 8150: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x155/0x3c0 mm/slab.c:3742 kmemdup+0x23/0x50 mm/util.c:118 kmemdup include/linux/string.h:446 [inline] dccp_feat_clone_sp_val.part.0+0x58/0xe0 net/dccp/feat.c:374 dccp_feat_clone_sp_val net/dccp/feat.c:373 [inline] __feat_register_sp+0x329/0x5a0 net/dccp/feat.c:738 dccp_feat_init+0x2bb/0x820 net/dccp/feat.c:1469 dccp_init_sock+0x2fc/0x3d0 net/dccp/proto.c:208 dccp_v6_init_sock+0x1b/0x96 net/dccp/ipv6.c:1005 inet6_create net/ipv6/af_inet6.c:255 [inline] inet6_create+0x9bf/0xf70 net/ipv6/af_inet6.c:110 __sock_create+0x3d8/0x740 net/socket.c:1276 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1605 dccp_v6_init_net+0x53/0x80 net/dccp/ipv6.c:1102 ops_init+0xb3/0x410 net/core/net_namespace.c:129 setup_net+0x2c2/0x720 net/core/net_namespace.c:315 copy_net_ns+0x1f7/0x335 net/core/net_namespace.c:438 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2551 __do_sys_unshare kernel/fork.c:2619 [inline] __se_sys_unshare kernel/fork.c:2617 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2617 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 aa_free_task_ctx security/apparmor/include/task.h:61 [inline] apparmor_task_free+0x143/0x1e0 security/apparmor/lsm.c:93 security_task_free+0x3e/0x70 security/security.c:992 __put_task_struct+0xea/0x340 kernel/fork.c:688 put_task_struct include/linux/sched/task.h:98 [inline] delayed_put_task_struct+0x1dc/0x320 kernel/exit.c:181 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 The buggy address belongs to the object at ffff8880a84ee400 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes to the right of 32-byte region [ffff8880a84ee400, ffff8880a84ee420) The buggy address belongs to the page: page:ffffea0002a13b80 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a84eefc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002d31408 ffffea0002d3bb08 ffff88813bff01c0 raw: ffff8880a84eefc1 ffff8880a84ee000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a84ee300: 02 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc ffff8880a84ee380: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880a84ee400: 01 fc fc fc fc fc fc fc 06 fc fc fc fc fc fc fc ^ ffff8880a84ee480: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc ffff8880a84ee500: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc ==================================================================