linux-hardening - Re: [PATCH v2] netlink: Return unsigned value for nla

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Date: Tue, 5 Dec 2023 08:58:45 +0100
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: Kees Cook <keescook@...omium.org>
Cc: Jakub Kicinski <kuba@...nel.org>, kernel test robot <lkp@...el.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Johannes Berg <johannes@...solutions.net>,
 Jeff Johnson <quic_jjohnson@...cinc.com>, Michael Walle <mwalle@...nel.org>,
 Max Schulze <max.schulze@...ine.de>, netdev@...r.kernel.org,
 linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] netlink: Return unsigned value for nla_len()

Le 04/12/2023 à 23:21, Kees Cook a écrit :
[snip]
>>> diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
>>> index f87aaf28a649..270feed9fd63 100644
>>> --- a/include/uapi/linux/netlink.h
>>> +++ b/include/uapi/linux/netlink.h
>>> @@ -247,7 +247,7 @@ struct nlattr {
>>>  
>>>  #define NLA_ALIGNTO		4
>>>  #define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
>>> -#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))
>>> +#define NLA_HDRLEN		((__u16) NLA_ALIGN(sizeof(struct nlattr)))
>> I wonder if this may break the compilation of some userspace tools with errors
>> like comparing signed and unsigned values.
> 
> Should I drop this part, then?
> 
Yes please.

Thank you,
Nicolas