linux-kernel - Re: [PATCH bpf] bpf: Fix kernel BUG in purge_effective

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Date:   Thu, 18 Aug 2022 21:40:14 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Pu Lehui <pulehui@...wei.com>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        tadeusz.struk@...aro.org, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        jean-philippe@...aro.org, haoluo@...gle.com, jolsa@...nel.org
Subject: Re: [PATCH bpf] bpf: Fix kernel BUG in purge_effective_progs

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Sat, 13 Aug 2022 21:40:30 +0800 you wrote:
> Syzkaller reported kernel BUG as follows:
> 
> ------------[ cut here ]------------
> kernel BUG at kernel/bpf/cgroup.c:925!
> invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
> RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0
> Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84
> 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48
> 8b 0c5
> RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246
> RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578
> RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000
> R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00
> FS:  00007f68213d2b80(0000) GS:ffff88813bc80000(0000)
> knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0
> Call Trace:
>  <TASK>
>  cgroup_bpf_prog_detach+0xcc/0x100
>  __sys_bpf+0x2273/0x2a00
>  __x64_sys_bpf+0x17/0x20
>  do_syscall_64+0x3b/0x90
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f68214dbcb9
> Code: 08 44 89 e0 5b 41 5c c3 66 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 ff8
> RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9
> RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009
> RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003
> R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20
> R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0
>  </TASK>
> Modules linked in:
> 
> [...]

Here is the summary with links:
  - [bpf] bpf: Fix kernel BUG in purge_effective_progs
    https://git.kernel.org/bpf/bpf/c/7d6620f107ba

You are awesome, thank you!
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