netdev - Re: [PATCH 01/15] skbuff: introduce skb_pull

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 30 Nov 2021 17:11:05 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc:     davem@...emloft.net, linux-bluetooth@...r.kernel.org,
        netdev@...r.kernel.org, dan.carpenter@...cle.com,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Subject: Re: [PATCH 01/15] skbuff: introduce skb_pull_data

On Tue, 30 Nov 2021 16:02:01 -0800 Luiz Augusto von Dentz wrote:
> From: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> 
> Like skb_pull but returns the original data pointer before pulling the
> data after performing a check against sbk->len.
> 
> This allows to change code that does "struct foo *p = (void *)skb->data;"
> which is hard to audit and error prone, to:
> 
>         p = skb_pull_data(skb, sizeof(*p));
>         if (!p)
>                 return;
> 
> Which is both safer and cleaner.

It doesn't take a data pointer, so not really analogous to
skb_put_data() and friends which come to mind. But I have 
no better naming suggestions. You will need to respin, tho,
if you want us to apply these directly, the patches as posted 
don't apply to either netdev tree.