From: syzbot <syzbot+08811615f0e17bc6708b@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bigeasy@linutronix.de,
bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net,
eddyz87@gmail.com, haoluo@google.com, hawk@kernel.org,
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,
patchwork-bot@kernel.org, sdf@fomichev.me, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: Re: [syzbot] [bpf?] [net?] general protection fault in dev_map_redirect
Date: Fri, 05 Jul 2024 23:21:24 -0700 [thread overview]
Message-ID: <000000000000767898061c8e30e8@google.com> (raw)
In-Reply-To: <000000000000adb970061c354f06@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=1228a3b9980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ed034204f2e40e53
dashboard link: https://syzkaller.appspot.com/bug?extid=08811615f0e17bc6708b
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=12512bc1980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fe346e980000
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+08811615f0e17bc6708b@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 UID: 0 PID: 5101 Comm: syz-executor153 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_map include/linux/filter.h:1699 [inline]
RIP: 0010:dev_map_redirect+0x65/0x6a0 kernel/bpf/devmap.c:1015
Code: 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 83 b3 3d 00 4c 8b 2b 4d 8d 7d 38 4c 89 fb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 0f 85 6e 04 00 00 41 8b 2f 89 ee 83 e6 02 31 ff
RSP: 0018:ffffc9000355f6e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000007 RCX: ffff888018b78000
RDX: 0000000000000000 RSI: 000000000355f738 RDI: ffff8880183a2800
RBP: dffffc0000000000 R08: 0000000000000007 R09: ffffffff81b5ee2f
R10: 0000000000000004 R11: ffff888018b78000 R12: 000000000355f738
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000038
FS: 000055557cbd4380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 0000000078ac6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
bpf_prog_ec9efaa32d58ce69+0x56/0x5a
__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: 0033:0x7fa9a2adcf90
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 31 e1 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:00007ffd3cd09788 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa9a2adcf90
RDX: 000000000000fdef RSI: 0000000020000100 RDI: 00000000000000c8
RBP: 0000000000000000 R08: 00007ffd3cd098b8 R09: 00007ffd3cd098b8
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_map include/linux/filter.h:1699 [inline]
RIP: 0010:dev_map_redirect+0x65/0x6a0 kernel/bpf/devmap.c:1015
Code: 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 83 b3 3d 00 4c 8b 2b 4d 8d 7d 38 4c 89 fb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 0f 85 6e 04 00 00 41 8b 2f 89 ee 83 e6 02 31 ff
RSP: 0018:ffffc9000355f6e8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000007 RCX: ffff888018b78000
RDX: 0000000000000000 RSI: 000000000355f738 RDI: ffff8880183a2800
RBP: dffffc0000000000 R08: 0000000000000007 R09: ffffffff81b5ee2f
R10: 0000000000000004 R11: ffff888018b78000 R12: 000000000355f738
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000038
FS: 000055557cbd4380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 0000000078ac6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c1 e8 03 shr $0x3,%rax
4: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
8: 74 08 je 0x12
a: 48 89 df mov %rbx,%rdi
d: e8 83 b3 3d 00 call 0x3db395
12: 4c 8b 2b mov (%rbx),%r13
15: 4d 8d 7d 38 lea 0x38(%r13),%r15
19: 4c 89 fb mov %r15,%rbx
1c: 48 c1 eb 03 shr $0x3,%rbx
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 0f b6 04 03 movzbl (%rbx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 6e 04 00 00 jne 0x4a4
36: 41 8b 2f mov (%r15),%ebp
39: 89 ee mov %ebp,%esi
3b: 83 e6 02 and $0x2,%esi
3e: 31 ff xor %edi,%edi
---
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.
next prev parent reply other threads:[~2024-07-06 6:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-01 20:19 [syzbot] [net?] [bpf?] general protection fault in dev_map_redirect syzbot
2024-07-02 18:40 ` Jakub Kicinski
2024-07-03 12:27 ` [PATCH net-net] tun: Assign missing bpf_net_context Sebastian Andrzej Siewior
2024-07-03 19:01 ` Jakub Kicinski
2024-07-03 19:21 ` Sebastian Andrzej Siewior
2024-07-04 10:14 ` [PATCH v2 " Sebastian Andrzej Siewior
2024-07-04 14:24 ` Jakub Kicinski
2024-07-04 14:48 ` [PATCH v3 net-next] " Sebastian Andrzej Siewior
2024-07-06 0:10 ` patchwork-bot+netdevbpf
2024-09-12 12:06 ` [PATCH net-net] " Breno Leitao
2024-09-12 12:28 ` Sebastian Andrzej Siewior
2024-09-12 13:17 ` Breno Leitao
2024-09-12 13:32 ` Vadim Fedorenko
2024-09-12 14:19 ` Breno Leitao
2024-09-12 14:30 ` Sebastian Andrzej Siewior
2024-09-12 14:40 ` Breno Leitao
2024-09-12 13:33 ` Sebastian Andrzej Siewior
2024-09-12 15:03 ` Daniel Borkmann
2024-09-16 10:19 ` Sebastian Andrzej Siewior
2024-09-12 14:24 ` Toke Høiland-Jørgensen
2024-07-06 6:21 ` syzbot [this message]
2024-07-06 13:13 ` [syzbot] [bpf?] [net?] general protection fault in dev_map_redirect Sebastian Andrzej Siewior
2024-07-06 13:38 ` syzbot
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