netdev - Re: [PATCH net-next] net: use the %px format to display sock

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Message-ID: <20220506185641.GA2289@bytedance>
Date:   Fri, 6 May 2022 11:56:41 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     kerneljasonxing@...il.com
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        kuba@...nel.org, pabeni@...hat.com, 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,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Jason Xing <xingwanli@...ishou.com>
Subject: Re: [PATCH net-next] net: use the %px format to display sock

Hi Jason,

On Thu, May 05, 2022 at 09:08:26PM +0800, kerneljasonxing@...il.com wrote:
> -		pr_err("Attempt to release TCP socket in state %d %p\n",
> +		pr_err("Attempt to release TCP socket in state %d %px\n",

I think we cannot use %px here for security reasons?  checkpatch is also
warning about it:

WARNING: Using vsprintf specifier '%px' potentially exposes the kernel memory layout, if you don't really need the address please consider using '%p'.
#21: FILE: net/ipv4/af_inet.c:142:
+		pr_err("Attempt to release TCP socket in state %d %px\n",
 		       sk->sk_state, sk);

Thanks,
Peilin Ye