linux-kernel - Re: [PATCH] net: define __packed for the userspace code

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <AANLkTiktOcAvAxcXUxh+4jKh0nBmYCf0OVG0wqRNMb9T@mail.gmail.com>
Date:	Sun, 22 Aug 2010 21:47:06 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: define __packed for the userspace code

On Sun, Aug 22, 2010 at 9:07 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Sunday 22 August 2010 13:23:42 Changli Gao wrote:
>> On Sun, Aug 22, 2010 at 7:12 PM, Changli Gao <xiaosuo@...il.com> wrote:
>> > This commit
>> >
>> >  commit bc10502dba37d3b210efd9f3867212298f13b78e
>> >  Author: Eric Dumazet <eric.dumazet@...il.com>
>> >  Date:   Thu Jun 3 03:21:52 2010 -0700
>> >
>> >    net: use __packed annotation
>> >
>> > makes use of __packed in the userspace code. So we'd better define __packed
>> > for the userspace code too.
>> >
>>
>> Oh, sorry. This patch can't work as include/linux/compiler.h isn't
>> exported to the userspace. But where should we define __packed for the
>> userspace code? include/linux/types.h?
>
> I would try to avoid making those structures packed to start with.
> From what I can see, they structures annotated in the above commit
> mostly don't even require explicit packing because they are already
> packed. Not marking them packed makes the code portable to non-gcc
> compilers.
>

Maybe __packed is used somewhere to hint that some members of a
structure maybe unaligned.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/