syzbot


general protection fault in bpf_check

Status: fixed on 2017/11/28 03:36
Subsystems: bpf
[Documentation on labels]
Fix commit: 8c01c4f896aa bpf: fix verifier NULL pointer dereference
First crash: 2388d, last: 2383d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in bpf_check (2) bpf C done 7 45d 56d 0/26 upstream: reported C repro on 2024/03/22 19:13

Sample crash report:
RBP: 00007f311079aa20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7550
R13: 00007f311079ab58 R14: 00000000004b7560 R15: 0000000000000000
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 27062 Comm: syz-executor5 Not tainted 4.14.0-rc7+ #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c2c74700 task.stack: ffff8801c3e28000
RIP: 0010:free_verifier_state kernel/bpf/verifier.c:347 [inline]
RIP: 0010:bpf_check+0xcf4/0x19c0 kernel/bpf/verifier.c:4533
RSP: 0018:ffff8801c3e2f5c8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 00000000fffffff4 RCX: 0000000000000000
RDX: 0000000000000070 RSI: ffffffff817d5aa9 RDI: 0000000000000380
RBP: ffff8801c3e2f668 R08: 0000000000000000 R09: 1ffff100387c5d9f
R10: 00000000218c4e80 R11: ffffffff85b34380 R12: ffff8801c4dc6a28
R13: 0000000000000000 R14: ffff8801c4dc6a00 R15: ffff8801c4dc6a20
FS:  00007f311079b700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d4a24 CR3: 00000001cbcd0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_prog_load+0xcbb/0x18e0 kernel/bpf/syscall.c:1166
 SYSC_bpf kernel/bpf/syscall.c:1690 [inline]
 SyS_bpf+0xae9/0x4620 kernel/bpf/syscall.c:1652
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007f311079abe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000030 RSI: 0000000020168000 RDI: 0000000000000005
RBP: 00007f311079aa20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7550
R13: 00007f311079ab58 R14: 00000000004b7560 R15: 0000000000000000
Code: df 48 c1 ea 03 80 3c 02 00 0f 85 e6 0b 00 00 4d 8b 6e 20 48 b8 00 00 00 00 00 fc ff df 49 8d bd 80 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 b6 0b 00 00 49 8b bd 80 03 00 00 e8 d6 0c 26 
RIP: free_verifier_state kernel/bpf/verifier.c:347 [inline] RSP: ffff8801c3e2f5c8
RIP: bpf_check+0xcf4/0x19c0 kernel/bpf/verifier.c:4533 RSP: ffff8801c3e2f5c8
---[ end trace c8d37f339dc64004 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/02 09:33 net-next-old e20f469660ad dab7524e .config console log report ci-upstream-net-kasan-gce
2017/11/07 09:20 linux-next 5a3517e009e9 e0a2b195 .config console log report ci-upstream-next-kasan-gce
2017/11/03 02:44 linux-next fa8785e862ef 02b8363d .config console log report skylake-linux-next-kasan-qemu
* Struck through repros no longer work on HEAD.