linux-kernel - Re: mmotm 2013-03-01-15-50 uploaded (strict user copy)

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Message-ID: <51420D62.7030701@codeaurora.org>
Date:	Thu, 14 Mar 2013 10:48:18 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	akpm@...ux-foundation.org
CC:	Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: mmotm 2013-03-01-15-50 uploaded (strict user copy)

On 03/01/13 19:42, Stephen Boyd wrote:
> On 03/01/13 19:00, Randy Dunlap wrote:
>> on i386:
>>
>> ERROR: "copy_from_user_overflow" [fs/binfmt_misc.ko] undefined!
>>
>> which I don't understand.
>> lib/usercopy.o is built and building binfmt_misc.c says:
>>
>>   CC [M]  fs/binfmt_misc.o
>> In file included from arch/x86/include/asm/uaccess.h:537:0,
>>                  from include/linux/uaccess.h:5,
>>                  from include/linux/highmem.h:8,
>>                  from include/linux/pagemap.h:10,
>>                  from fs/binfmt_misc.c:27:
>> arch/x86/include/asm/uaccess_32.h: In function 'parse_command.part.1':
>> arch/x86/include/asm/uaccess_32.h:211:26: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct [enabled by default]
> Hm.. That's because it's part of lib and not obj, right?
>
> diff --git a/lib/Makefile b/lib/Makefile
> index 59fabd0..4c55104 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -15,7 +15,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
>          is_single_threaded.o plist.o decompress.o kobject_uevent.o \
>          earlycpio.o percpu-refcount.o
>  
> -lib-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o
> +obj-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o
>  lib-$(CONFIG_MMU) += ioremap.o
>  lib-$(CONFIG_SMP) += cpumask.o
>  
>

Andrew, can you squash this into "Kconfig: consolidate
CONFIG_DEBUG_STRICT_USER_COPY_CHECKS"?

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