================================================================== BUG: KASAN: slab-out-of-bounds in mqueue_get_tree+0x2a2/0x2e0 ipc/mqueue.c:362 Read of size 8 at addr ffff8801bb1948a8 by task syz-executor4/20876 CPU: 1 PID: 20876 Comm: syz-executor4 Not tainted 4.19.0-rc3-next-20180912+ #72 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+0x1d3/0x2c4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 mqueue_get_tree+0x2a2/0x2e0 ipc/mqueue.c:362 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1787 mq_create_mount+0xe3/0x190 ipc/mqueue.c:415 mq_init_ns+0x15a/0x210 ipc/mqueue.c:1621 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x3d2/0x580 ipc/namespace.c:84 create_new_namespaces+0x376/0x900 kernel/nsproxy.c:87 copy_namespaces+0x3ff/0x4d0 kernel/nsproxy.c:165 copy_process+0x4e06/0x8780 kernel/fork.c:1916 _do_fork+0x1cb/0x11d0 kernel/fork.c:2212 __do_sys_clone kernel/fork.c:2319 [inline] __se_sys_clone kernel/fork.c:2313 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2313 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4572d9 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb0d0e96c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb0d0e976d4 RCX: 00000000004572d9 RDX: 00000000200006c0 RSI: 0000000020000640 RDI: 000000005a200000 RBP: 00000000009301e0 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000020000700 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cbe68 R14: 00000000004c36da R15: 0000000000000002 Allocated by task 20876: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] create_ipc_ns ipc/namespace.c:45 [inline] copy_ipcs+0x1c6/0x580 ipc/namespace.c:84 create_new_namespaces+0x376/0x900 kernel/nsproxy.c:87 copy_namespaces+0x3ff/0x4d0 kernel/nsproxy.c:165 copy_process+0x4e06/0x8780 kernel/fork.c:1916 _do_fork+0x1cb/0x11d0 kernel/fork.c:2212 __do_sys_clone kernel/fork.c:2319 [inline] __se_sys_clone kernel/fork.c:2313 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2313 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8801bb194180 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1832 bytes inside of 2048-byte region [ffff8801bb194180, ffff8801bb194980) The buggy address belongs to the page: page:ffffea0006ec6500 count:1 mapcount:0 mapping:ffff8801da800c40 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0007363c08 ffff8801da801948 ffff8801da800c40 raw: 0000000000000000 ffff8801bb194180 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bb194780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bb194800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801bb194880: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801bb194900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801bb194980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================