netdev - Re: [PATCH bpf-next] bpf: Fix potential array overflow in bpf_trampoline_get

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Date:   Thu, 12 May 2022 04:30:12 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Yuntao Wang <ytcoode@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf: Fix potential array overflow in
 bpf_trampoline_get_progs()

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Sat, 30 Apr 2022 21:08:03 +0800 you wrote:
> The cnt value in the 'cnt >= BPF_MAX_TRAMP_PROGS' check does not
> include BPF_TRAMP_MODIFY_RETURN bpf programs, so the number of
> the attached BPF_TRAMP_MODIFY_RETURN bpf programs in a trampoline
> can exceed BPF_MAX_TRAMP_PROGS.
> 
> When this happens, the assignment '*progs++ = aux->prog' in
> bpf_trampoline_get_progs() will cause progs array overflow as the
> progs field in the bpf_tramp_progs struct can only hold at most
> BPF_MAX_TRAMP_PROGS bpf programs.
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: Fix potential array overflow in bpf_trampoline_get_progs()
    https://git.kernel.org/bpf/bpf-next/c/a2aa95b71c9b

You are awesome, thank you!
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