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Subject: Re: [PATCH bpf] bpf: Annotate bpf_long_memcpy with data_race
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <169351382344.13181.5151687407861972063.git-patchwork-notify@kernel.org>
Date: Thu, 31 Aug 2023 20:30:23 +0000
References: <57628f7a15e20d502247c3b55fceb1cb2b31f266.1693342186.git.daniel@iogearbox.net>
In-Reply-To: <57628f7a15e20d502247c3b55fceb1cb2b31f266.1693342186.git.daniel@iogearbox.net>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: bpf@vger.kernel.org,
 syzbot+97522333291430dd277f@syzkaller.appspotmail.com, elver@google.com,
 yonghong.song@linux.dev

Hello:

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

On Tue, 29 Aug 2023 22:53:52 +0200 you wrote:
> syzbot reported a data race splat between two processes trying to
> update the same BPF map value via syscall on different CPUs:
> 
>   BUG: KCSAN: data-race in bpf_percpu_array_update / bpf_percpu_array_update
> 
>   write to 0xffffe8fffe7425d8 of 8 bytes by task 8257 on cpu 1:
>    bpf_long_memcpy include/linux/bpf.h:428 [inline]
>    bpf_obj_memcpy include/linux/bpf.h:441 [inline]
>    copy_map_value_long include/linux/bpf.h:464 [inline]
>    bpf_percpu_array_update+0x3bb/0x500 kernel/bpf/arraymap.c:380
>    bpf_map_update_value+0x190/0x370 kernel/bpf/syscall.c:175
>    generic_map_update_batch+0x3ae/0x4f0 kernel/bpf/syscall.c:1749
>    bpf_map_do_batch+0x2df/0x3d0 kernel/bpf/syscall.c:4648
>    __sys_bpf+0x28a/0x780
>    __do_sys_bpf kernel/bpf/syscall.c:5241 [inline]
>    __se_sys_bpf kernel/bpf/syscall.c:5239 [inline]
>    __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5239
>    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>    do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
>    entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> [...]

Here is the summary with links:
  - [bpf] bpf: Annotate bpf_long_memcpy with data_race
    https://git.kernel.org/bpf/bpf/c/6a86b5b5cd76

You are awesome, thank you!
-- 
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