syzbot


invalid opcode in __check_object_size

Status: auto-closed as invalid on 2019/05/21 15:13
Reported-by: syzbot+c00c98fa4f046928cb38@syzkaller.appspotmail.com
First crash: 2030d, last: 2030d

Sample crash report:
usercopy: kernel memory exposure attempt detected from ffff8801a84d41fd (kmalloc-8192) (337 bytes)
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 0 PID: 27329 Comm: syz-executor4 Not tainted 4.14.82+ #8
task: ffff8801a8981780 task.stack: ffff88019c9a8000
RIP: 0010:report_usercopy mm/usercopy.c:64 [inline]
RIP: 0010:__check_object_size+0x311/0x3a2 mm/usercopy.c:264
RSP: 0018:ffff88019c9afb58 EFLAGS: 00010282
RAX: 0000000000000062 RBX: 0000000000000151 RCX: 000000000001243e
RDX: 0000000000000000 RSI: ffffc90000519000 RDI: ffffffffa85d2420
RBP: ffff8801a84d41fd R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa6ac0060
R13: 0000000000000001 R14: ffffffffa6ac0020 R15: ffffea0006a13400
FS:  00007f684f3b0700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072c000 CR3: 0000000180b30006 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 check_object_size include/linux/thread_info.h:108 [inline]
 check_copy_size include/linux/thread_info.h:139 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 bpf_test_finish.isra.0+0xba/0x190 net/bpf/test_run.c:59
 bpf_prog_test_run_skb+0x4d0/0x8c0 net/bpf/test_run.c:144
 bpf_prog_test_run kernel/bpf/syscall.c:1343 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1615 [inline]
 SyS_bpf+0x79d/0x3700 kernel/bpf/syscall.c:1560
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f684f3afc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f684f3b06d4
R13: 00000000004bd952 R14: 00000000004ccbf0 R15: 00000000ffffffff
Code: 00 ac a6 4c 0f 45 e2 e8 ce d3 db ff 48 8b 04 24 49 89 d9 48 89 e9 4c 89 f2 4c 89 e6 48 c7 c7 a0 00 ac a6 49 89 c0 e8 ba 15 cd ff <0f> 0b 4c 89 ff e8 35 cf fd ff e9 09 fe ff ff 4c 89 ff e8 28 cf 
RIP: report_usercopy mm/usercopy.c:64 [inline] RSP: ffff88019c9afb58
RIP: __check_object_size+0x311/0x3a2 mm/usercopy.c:264 RSP: ffff88019c9afb58
netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'.
---[ end trace a5f07f15a4baf7b8 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/11/22 15:12 android-4.14 d8dce63b0484 2ee77802 .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.