linux-kernel - linux-next: build warnings (buffer size is not provably correct)

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Date:	Thu, 8 Oct 2009 15:47:10 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	James Morris <jmorris@...ei.org>,
	David Howells <dhowells@...hat.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: linux-next: build warnings (buffer size is not provably correct)

Hi all,

Today's linux-next build (i386 defconfig) produced these warnings:

In file included from arch/x86/include/asm/uaccess.h:572,
                 from kernel/capability.c:18:
arch/x86/include/asm/uaccess_32.h: In function 'sys_capset':
arch/x86/include/asm/uaccess_32.h:211: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In file included from arch/x86/include/asm/uaccess.h:572,
                 from include/linux/poll.h:14,
                 from include/linux/rtc.h:115,
                 from include/linux/mc146818rtc.h:16,
                 from drivers/char/nvram.c:108:
arch/x86/include/asm/uaccess_32.h: In function 'nvram_write':
arch/x86/include/asm/uaccess_32.h:211: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct

Brought to light by commit 4a3127693001c61a21d1ce680db6340623f52e93
("x86: Turn the copy_from_user check into an (optional) compile time
warning") from the tip tree.

Clearly these are not problems with the tip tree, but someone may want to
look at them.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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