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

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Date:   Sat, 7 May 2022 16:22:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jason Xing <kerneljasonxing@...il.com>
Cc:     Peilin Ye <yepeilin.cs@...il.com>, 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

On Sat, May 07, 2022 at 09:26:07AM +0800, Jason Xing wrote:
> On Sat, May 7, 2022 at 2:56 AM Peilin Ye <yepeilin.cs@...il.com> wrote:
> >
> > 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:
> >
> 
> I noticed this warning before submitting. Since the %p format doesn't
> print the real address, printing the address here will be helpless and
> we cannot trace what exactly the bad socket is.
> 
> What do you suggest?

How is a socket identified in places like /proc/<PID>/net/tcp ?
Could you print the local and remote port to identify the socket?

How does the address of the structure actually help you? Do you see
this address somewhere else?

     Andrew