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Date: Fri, 24 Mar 2023 11:22:05 -0700
From: Kui-Feng Lee <sinquersw@...il.com>
To: syzbot <syzbot+71ccc0fe37abb458406b@...kaller.appspotmail.com>,
andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
daniel@...earbox.net, haoluo@...gle.com, john.fastabend@...il.com,
jolsa@...nel.org, kpsingh@...nel.org, kuifeng@...a.com,
linux-kernel@...r.kernel.org, martin.lau@...nel.org,
martin.lau@...ux.dev, netdev@...r.kernel.org, sdf@...gle.com,
song@...nel.org, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: [syzbot] [bpf?] [net?] general protection fault in
bpf_struct_ops_link_create
I am investigating on this issue.
On 3/23/23 23:11, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 226bc6ae6405 Merge branch 'Transit between BPF TCP congest..
> git tree: bpf-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=139c727ac80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=cab35c936731a347
> dashboard link: https://syzkaller.appspot.com/bug?extid=71ccc0fe37abb458406b
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11ef67a1c80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119c20fec80000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ac055f681ed7/disk-226bc6ae.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/3895cc8a51d2/vmlinux-226bc6ae.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/1b18bb9fae05/bzImage-226bc6ae.xz
>
> The issue was bisected to:
>
> commit 68b04864ca425d1894c96b8141d4fba1181f11cb
> Author: Kui-Feng Lee <kuifeng@...a.com>
> Date: Thu Mar 23 03:24:00 2023 +0000
>
> bpf: Create links for BPF struct_ops maps.
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=116731b1c80000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=136731b1c80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=156731b1c80000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+71ccc0fe37abb458406b@...kaller.appspotmail.com
> Fixes: 68b04864ca42 ("bpf: Create links for BPF struct_ops maps.")
>
> general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
> CPU: 1 PID: 5081 Comm: syz-executor182 Not tainted 6.2.0-syzkaller-13084-g226bc6ae6405 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
> RIP: 0010:bpf_struct_ops_valid_to_reg kernel/bpf/bpf_struct_ops.c:764 [inline]
> RIP: 0010:bpf_struct_ops_link_create+0xb1/0x390 kernel/bpf/bpf_struct_ops.c:879
> Code: 95 81 eb ff 48 85 c0 48 89 c5 0f 84 9e 02 00 00 e8 24 27 dd ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 60 02 00 00 44 8b 65 18 bf 1a
> RSP: 0018:ffffc90003b8fc38 EFLAGS: 00010203
> RAX: dffffc0000000000 RBX: 1ffff92000771f87 RCX: 0000000000000000
> RDX: 0000000000000001 RSI: ffffffff81a7dc8c RDI: 000000000000000f
> RBP: fffffffffffffff7 R08: 0000000000000007 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
> R13: 000000000000002c R14: ffffc90003b8fde8 R15: 0000000000000000
> FS: 0000555556538300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000eaa388 CR3: 00000000206d2000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> link_create kernel/bpf/syscall.c:4585 [inline]
> __sys_bpf+0x3b77/0x53b0 kernel/bpf/syscall.c:5129
> __do_sys_bpf kernel/bpf/syscall.c:5163 [inline]
> __se_sys_bpf kernel/bpf/syscall.c:5161 [inline]
> __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5161
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7fc374490ae9
> Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fffe2184578 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc374490ae9
> RDX: 0000000000000010 RSI: 0000000020001340 RDI: 000000000000001c
> RBP: 00007fc374454c90 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fc374454d20
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:bpf_struct_ops_valid_to_reg kernel/bpf/bpf_struct_ops.c:764 [inline]
> RIP: 0010:bpf_struct_ops_link_create+0xb1/0x390 kernel/bpf/bpf_struct_ops.c:879
> Code: 95 81 eb ff 48 85 c0 48 89 c5 0f 84 9e 02 00 00 e8 24 27 dd ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 60 02 00 00 44 8b 65 18 bf 1a
> RSP: 0018:ffffc90003b8fc38 EFLAGS: 00010203
> RAX: dffffc0000000000 RBX: 1ffff92000771f87 RCX: 0000000000000000
> RDX: 0000000000000001 RSI: ffffffff81a7dc8c RDI: 000000000000000f
> RBP: fffffffffffffff7 R08: 0000000000000007 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
> R13: 000000000000002c R14: ffffc90003b8fde8 R15: 0000000000000000
> FS: 0000555556538300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000eaa388 CR3: 00000000206d2000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
> 0: 95 xchg %eax,%ebp
> 1: 81 eb ff 48 85 c0 sub $0xc08548ff,%ebx
> 7: 48 89 c5 mov %rax,%rbp
> a: 0f 84 9e 02 00 00 je 0x2ae
> 10: e8 24 27 dd ff callq 0xffdd2739
> 15: 48 8d 7d 18 lea 0x18(%rbp),%rdi
> 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
> 20: fc ff df
> 23: 48 89 fa mov %rdi,%rdx
> 26: 48 c1 ea 03 shr $0x3,%rdx
> * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
> 2e: 84 c0 test %al,%al
> 30: 74 08 je 0x3a
> 32: 3c 03 cmp $0x3,%al
> 34: 0f 8e 60 02 00 00 jle 0x29a
> 3a: 44 8b 65 18 mov 0x18(%rbp),%r12d
> 3e: bf .byte 0xbf
> 3f: 1a .byte 0x1a
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
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