syzbot


general protection fault in bpf_clone_redirect (2)

Status: public: reported C repro on 2019/08/30 23:43
Reported-by: syzbot+d46cff893ea0799b55bd@syzkaller.appspotmail.com
First crash: 1898d, last: 1898d
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 general protection fault in bpf_clone_redirect 1 2229d 2229d 0/1 auto-closed as invalid on 2019/04/02 02:03
linux-4.14 general protection fault in bpf_clone_redirect 2 1823d 1841d 0/1 auto-closed as invalid on 2020/03/12 14:54

Sample crash report:
audit: type=1400 audit(1567206683.969:7): avc:  denied  { map } for  pid=1779 comm="syz-executor195" path="/root/syz-executor195311216" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
audit: type=1400 audit(1567206683.999:8): avc:  denied  { prog_load } for  pid=1779 comm="syz-executor195" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
audit: type=1400 audit(1567206684.019:9): avc:  denied  { prog_run } for  pid=1779 comm="syz-executor195" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 0 PID: 1779 Comm: syz-executor195 Not tainted 4.14.140+ #39
task:         (ptrval) task.stack:         (ptrval)
RIP: 0010:read_pnet include/net/net_namespace.h:282 [inline]
RIP: 0010:dev_net include/linux/netdevice.h:2015 [inline]
RIP: 0010:____bpf_clone_redirect net/core/filter.c:1768 [inline]
RIP: 0010:bpf_clone_redirect+0x6a/0x2b0 net/core/filter.c:1759
RSP: 0018:ffff8881cfc1f808 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881d697ae20 RCX: 00000000607cfff9
RDX: 00000000000000a7 RSI: 0000000000000006 RDI: 0000000000000538
RBP: 0000000000000000 R08: ffffffffa9dfd0bb R09: ffffed103b7444fa
R10: ffffed103b7444f9 R11: ffff8881dba227cf R12: 0000000000000000
R13: 0000000000000006 R14: ffffffffaafb97e0 R15: ffffc90000496088
FS:  0000000000a19880(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000200 CR3: 00000001d1288006 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ___bpf_prog_run+0x2478/0x5510 kernel/bpf/core.c:1086
Code: 48 c1 ea 03 80 3c 02 00 0f 85 55 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 10 49 8d bc 24 38 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 12 02 00 00 49 8b bc 24 38 05 00 00 44 89 ee 
RIP: read_pnet include/net/net_namespace.h:282 [inline] RSP: ffff8881cfc1f808
RIP: dev_net include/linux/netdevice.h:2015 [inline] RSP: ffff8881cfc1f808
RIP: ____bpf_clone_redirect net/core/filter.c:1768 [inline] RSP: ffff8881cfc1f808
RIP: bpf_clone_redirect+0x6a/0x2b0 net/core/filter.c:1759 RSP: ffff8881cfc1f808
---[ end trace 7f4889397ebda4c3 ]---
Kernel panic - not syncing: Fatal exception
Kernel Offset: 0x28c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/08/30 23:14 android-4.14 987732fcbbe3 fd37b39e .config console log report syz C ci-android-414-kasan-gce-root
2019/08/30 22:42 android-4.14 987732fcbbe3 fd37b39e .config console log report ci-android-414-kasan-gce-root
* Struck through repros no longer work on HEAD.