syzbot


BUG: unable to handle kernel NULL pointer dereference in bpf_prog_ADDR

Status: upstream: reported syz repro on 2020/08/02 22:45
Reported-by: syzbot+192a7fbbece55f740074@syzkaller.appspotmail.com
First crash: 914d, last: 599d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: sleeping function called from invalid context in do_user_addr_fault (2) syz done unreliable 27 205d 769d 0/24 upstream: reported syz repro on 2020/12/25 13:45
Last patch testing requests:
Created Duration User Patch Repo Result
2022/12/13 18:31 19m retest repro bpf-next OK log
2022/12/13 14:31 19m retest repro bpf-next OK log
2022/12/13 09:31 19m retest repro bpf OK log
2022/12/13 06:31 8m retest repro bpf error
2022/10/07 01:30 17m retest repro linux-next error
2022/10/06 12:30 17m retest repro linux-next error
2022/09/29 22:30 15m retest repro upstream OK log
2022/09/29 20:30 15m retest repro upstream OK log
2022/09/29 18:30 15m retest repro upstream OK log
2022/09/26 20:30 16m retest repro upstream OK log

Sample crash report:
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 98023067 P4D 98023067 PUD 9676d067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8634 Comm: syz-executor.2 Not tainted 5.9.0-rc1-next-20200821-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_prog_cd248b930ddf8412+0x1f/0xae4
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc90005797b08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: ffff888097a06040 RSI: ffffc90000ef2038 RDI: ffffc90005797cb0
RBP: ffffc90005797b30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000ef2000
R13: ffffc90000ef2000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f29bce87700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009648c000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_prog_run_xdp include/linux/filter.h:734 [inline]
 bpf_test_run+0x221/0xc70 net/bpf/test_run.c:47
 bpf_prog_test_run_xdp+0x2ca/0x510 net/bpf/test_run.c:563
 bpf_prog_test_run kernel/bpf/syscall.c:2996 [inline]
 __do_sys_bpf+0x26a2/0x4b30 kernel/bpf/syscall.c:4206
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d579
Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f29bce86c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000001440 RCX: 000000000045d579
RDX: 0000000000000010 RSI: 0000000020001300 RDI: 000000000000000a
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007fffc337f90f R14: 00007f29bce879c0 R15: 000000000118cfec
Modules linked in:
CR2: 0000000000000000
---[ end trace b8778aa70cfacda4 ]---
RIP: 0010:bpf_prog_cd248b930ddf8412+0x1f/0xae4
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc90005797b08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: ffff888097a06040 RSI: ffffc90000ef2038 RDI: ffffc90005797cb0
RBP: ffffc90005797b30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000ef2000
R13: ffffc90000ef2000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f29bce87700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009648c000 CR4: 00000000001506e0

Crashes (19):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-linux-next-kasan-gce-root 2020/08/24 02:00 linux-next 494d311a82bb cef5ae68 .config console log report syz
ci-upstream-linux-next-kasan-gce-root 2020/08/06 03:13 linux-next 01830e6c042e 0487ea6f .config console log report syz
ci-upstream-kasan-gce-root 2021/06/12 18:50 upstream ad347abe4a98 1ba81399 .config console log report syz BUG: unable to handle kernel NULL pointer dereference in bpf_prog_ADDR
ci-upstream-kasan-gce-selinux-root 2020/08/23 01:33 upstream c3d8f220d012 1da71ab0 .config console log report syz
ci-upstream-kasan-gce-root 2020/08/23 01:11 upstream c3d8f220d012 1da71ab0 .config console log report syz
ci-upstream-kasan-gce-smack-root 2020/08/23 01:08 upstream c3d8f220d012 1da71ab0 .config console log report syz
ci-upstream-kasan-gce-root 2020/08/04 03:54 upstream 3208167a865e 196277c4 .config console log report syz
ci-upstream-kasan-gce-selinux-root 2020/08/02 12:14 upstream ac3a0c847296 63a73341 .config console log report syz
ci-upstream-kasan-gce-smack-root 2020/08/01 23:27 upstream 7dc6fd0f3b84 d895b3be .config console log report syz
ci-upstream-bpf-kasan-gce 2020/08/23 01:04 bpf 4af7b32f84aa 1da71ab0 .config console log report syz
ci-upstream-net-this-kasan-gce 2020/08/23 01:04 net eeaac3634ee0 1da71ab0 .config console log report syz
ci-upstream-bpf-kasan-gce 2020/08/01 18:38 bpf 69138b34a724 d895b3be .config console log report syz
ci-upstream-net-this-kasan-gce 2020/08/01 18:08 net 69138b34a724 d895b3be .config console log report syz
ci-upstream-net-kasan-gce 2020/08/23 01:44 net-next 1aecbf1861f8 1da71ab0 .config console log report syz
ci-upstream-bpf-next-kasan-gce 2020/08/23 01:04 bpf-next 9c0f8cbdc0e9 1da71ab0 .config console log report syz
ci-upstream-bpf-next-kasan-gce 2020/08/05 11:07 bpf-next da7955405fb2 b7129355 .config console log report syz
ci-upstream-net-kasan-gce 2020/08/01 21:42 net-next 8f3f330da28e d895b3be .config console log report syz
ci-upstream-bpf-kasan-gce 2020/12/13 07:47 bpf d9838b1d3928 bca53db9 .config console log report info
ci-upstream-net-this-kasan-gce 2020/08/01 17:19 net 69138b34a724 d895b3be .config console log report
* Struck through repros no longer work on HEAD.