From: "H. Peter Anvin" <hpa@zytor.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Arjan van de Ven <arjan@infradead.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Ingo Molnar <mingo@elte.hu>, David Miller <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: strict copy_from_user checks issues?
Date: Fri, 08 Jan 2010 16:10:44 -0800 [thread overview]
Message-ID: <4B47C984.1080903@zytor.com> (raw)
In-Reply-To: <201001090107.43402.arnd@arndb.de>
On 01/08/2010 04:07 PM, Arnd Bergmann wrote:
>
> Also, the calling conventions require you to write slightly more when
> you want to pass down an error value, e.g.
>
> return copy_to_user(uptr, &data, sizeof(data)) ? -EFAULT : 0;
>
> instead of
>
> return put_user(data, uptr);
>
> The latter form requires a macro instead of a function for the user copy,
> but we now have that anyway because of the size check.
>
Well... we already have the latter form?
-hpa
next prev parent reply other threads:[~2010-01-09 0:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-04 15:43 strict copy_from_user checks issues? Heiko Carstens
2010-01-05 1:43 ` Arjan van de Ven
2010-01-05 7:35 ` Ingo Molnar
2010-01-05 9:48 ` Heiko Carstens
2010-01-05 12:47 ` Arnd Bergmann
2010-01-05 13:19 ` Heiko Carstens
2010-01-05 13:31 ` Arjan van de Ven
2010-01-05 15:22 ` [PATCH] sparc: copy_from_user() should not return -EFAULT Heiko Carstens
2010-01-05 17:27 ` Andi Kleen
2010-01-05 20:47 ` David Miller
2010-01-06 3:20 ` Arjan van de Ven
2010-01-05 17:55 ` Arnd Bergmann
2010-01-06 4:42 ` David Miller
2010-01-05 22:15 ` [tip:x86/urgent] x86: " tip-bot for Heiko Carstens
2010-01-05 13:34 ` strict copy_from_user checks issues? Arjan van de Ven
2010-01-05 13:36 ` Arjan van de Ven
2010-01-05 13:45 ` Arnd Bergmann
2010-01-05 13:52 ` Arjan van de Ven
2010-01-05 15:20 ` Arnd Bergmann
2010-01-05 21:44 ` H. Peter Anvin
2010-01-07 14:02 ` Arnd Bergmann
2010-01-07 23:57 ` H. Peter Anvin
2010-01-09 0:07 ` Arnd Bergmann
2010-01-09 0:10 ` H. Peter Anvin [this message]
2010-01-09 8:01 ` Arnd Bergmann
2010-01-09 20:57 ` H. Peter Anvin
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