linux-kernel - Re: 3.0.0-git21 -- CC fs/binfmt_misc.o .../asm/uaccess_32.h:211:26: error: call to ‘copy_from_user_overflow’ declared with attribute error: copy_from_user() buffer size is not provably correct

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Date:	Sat, 6 Aug 2011 19:56:00 +0200
From:	Alessandro Suardi <alessandro.suardi@...il.com>
To:	Miles Lane <miles.lane@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: 3.0.0-git21 -- CC fs/binfmt_misc.o .../asm/uaccess_32.h:211:26: error: call to ‘copy_from_user_overflow’ declared with attribute error: copy_from_user() buffer size is not provably correct

On Sat, Aug 6, 2011 at 7:49 PM, Miles Lane <miles.lane@...il.com> wrote:
> I am not finding any kernel configuration that enables me to avoid
> this compile error.  Anyone know what I can do to successfully build
> this kernel?
>
> On Fri, Aug 5, 2011 at 1:15 PM, Miles Lane <miles.lane@...il.com> wrote:
>> CC      fs/binfmt_misc.o
>> In file included from /usr/src/linux-3.0/arch/x86/include/asm/uaccess.h:573:0,
>>                 from include/linux/uaccess.h:5,
>>                 from include/linux/highmem.h:7,
>>                 from include/linux/pagemap.h:10,
>>                 from fs/binfmt_misc.c:26:
>> /usr/src/linux-3.0/arch/x86/include/asm/uaccess_32.h: In function
>> ‘parse_command.part.1’:
>> /usr/src/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: error:
>> call to ‘copy_from_user_overflow’ declared with attribute error:
>> copy_from_user() buffer size is not provably correct

Well, uaccess_32.h has this:

extern void copy_from_user_overflow(void)
#ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
    __compiletime_error("copy_from_user() buffer size is not provably correct")
#else
    __compiletime_warning("copy_from_user() buffer size is not provably correct"
)
#endif

 and you have CONFIG_DEBUG_STRICT_USER_COPY_CHECKS=y.

ciao,

--alessandro

 "There's always a siren singing you to shipwreck"

   (Radiohead, "There There")
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