From: syzbot <syzbot+5ae46b237278e2369cac@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, davem@davemloft.net, eddyz87@gmail.com,
edumazet@google.com, haoluo@google.com,
john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org,
kuba@kernel.org, linux-kernel@vger.kernel.org,
martin.lau@linux.dev, netdev@vger.kernel.org, pabeni@redhat.com,
sdf@fomichev.me, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: Re: [syzbot] [bpf?] [net?] stack segment fault in bpf_xdp_redirect
Date: Fri, 05 Jul 2024 20:39:20 -0700 [thread overview]
Message-ID: <000000000000e40c9b061c8bec7b@google.com> (raw)
In-Reply-To: <0000000000008f77c2061c357383@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: 0b58e108042b Add linux-next specific files for 20240703
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ee3e81980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ed034204f2e40e53
dashboard link: https://syzkaller.appspot.com/bug?extid=5ae46b237278e2369cac
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a6e781980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165e6db9980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1d079762feae/disk-0b58e108.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e53996c8d8c2/vmlinux-0b58e108.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a0bf21cdd844/bzImage-0b58e108.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5ae46b237278e2369cac@syzkaller.appspotmail.com
Oops: stack segment: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5100 Comm: syz-executor326 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline]
RIP: 0010:____bpf_xdp_redirect net/core/filter.c:4561 [inline]
RIP: 0010:bpf_xdp_redirect+0x59/0x1a0 net/core/filter.c:4559
Code: 81 c3 00 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 b5 18 90 f8 48 8b 1b 4c 8d 63 38 4c 89 e5 48 c1 ed 03 <42> 0f b6 44 2d 00 84 c0 0f 85 d0 00 00 00 45 8b 34 24 44 89 f6 83
RSP: 0018:ffffc900033bf6f8 EFLAGS: 00010202
RAX: 1ffff11004549e40 RBX: 0000000000000000 RCX: ffff888022a4da00
RDX: 0000000000000000 RSI: 0000000002000000 RDI: ffffc900033bf900
RBP: 0000000000000007 R08: ffffffff895fff80 R09: 1ffff110172a8938
R10: dffffc0000000000 R11: ffffed10172a8939 R12: 0000000000000038
R13: dffffc0000000000 R14: 1ffff92000677f21 R15: 0000000002000000
FS: 000055557e4d4380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000007abc8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
bpf_prog_56e821181540367a+0x1d/0x1f
__bpf_prog_run include/linux/filter.h:691 [inline]
bpf_prog_run_xdp include/net/xdp.h:514 [inline]
bpf_prog_run_generic_xdp+0x679/0x14c0 net/core/dev.c:4962
netif_receive_generic_xdp net/core/dev.c:5075 [inline]
do_xdp_generic+0x673/0xb90 net/core/dev.c:5134
tun_get_user+0x2805/0x4560 drivers/net/tun.c:1924
tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa72/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f806d71bfd0
Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d d1 e0 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89
RSP: 002b:00007fff9b41b6b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff9b41b750 RCX: 00007f806d71bfd0
RDX: 000000000000fdef RSI: 0000000020000100 RDI: 00000000000000c8
RBP: 00007fff9b41b700 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline]
RIP: 0010:____bpf_xdp_redirect net/core/filter.c:4561 [inline]
RIP: 0010:bpf_xdp_redirect+0x59/0x1a0 net/core/filter.c:4559
Code: 81 c3 00 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 b5 18 90 f8 48 8b 1b 4c 8d 63 38 4c 89 e5 48 c1 ed 03 <42> 0f b6 44 2d 00 84 c0 0f 85 d0 00 00 00 45 8b 34 24 44 89 f6 83
RSP: 0018:ffffc900033bf6f8 EFLAGS: 00010202
RAX: 1ffff11004549e40 RBX: 0000000000000000 RCX: ffff888022a4da00
RDX: 0000000000000000 RSI: 0000000002000000 RDI: ffffc900033bf900
RBP: 0000000000000007 R08: ffffffff895fff80 R09: 1ffff110172a8938
R10: dffffc0000000000 R11: ffffed10172a8939 R12: 0000000000000038
R13: dffffc0000000000 R14: 1ffff92000677f21 R15: 0000000002000000
FS: 000055557e4d4380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000007abc8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 81 c3 00 18 00 00 add $0x1800,%ebx
6: 48 89 d8 mov %rbx,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
12: 74 08 je 0x1c
14: 48 89 df mov %rbx,%rdi
17: e8 b5 18 90 f8 call 0xf89018d1
1c: 48 8b 1b mov (%rbx),%rbx
1f: 4c 8d 63 38 lea 0x38(%rbx),%r12
23: 4c 89 e5 mov %r12,%rbp
26: 48 c1 ed 03 shr $0x3,%rbp
* 2a: 42 0f b6 44 2d 00 movzbl 0x0(%rbp,%r13,1),%eax <-- trapping instruction
30: 84 c0 test %al,%al
32: 0f 85 d0 00 00 00 jne 0x108
38: 45 8b 34 24 mov (%r12),%r14d
3c: 44 89 f6 mov %r14d,%esi
3f: 83 .byte 0x83
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
prev parent reply other threads:[~2024-07-06 3:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-01 20:29 [syzbot] [bpf?] [net?] stack segment fault in bpf_xdp_redirect syzbot
2024-07-01 23:19 ` syzbot
2024-07-06 3:39 ` syzbot [this message]
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