linux-kernel - Re: linux-next: Tree for July 28 ("copy_from_user

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Message-Id: <20110728220926.6d1a91f4.rdunlap@xenotime.net>
Date:	Thu, 28 Jul 2011 22:09:26 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	sedat.dilek@...il.com
Cc:	Sedat Dilek <sedat.dilek@...glemail.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Tree for July 28 ("copy_from_user_overflow"
 undefined)

On Fri, 29 Jul 2011 03:34:26 +0200 Sedat Dilek wrote:

> On Fri, Jul 29, 2011 at 1:01 AM, Randy Dunlap <rdunlap@...otime.net> wrote:
> > On Thu, 28 Jul 2011 16:05:31 +0200 Sedat Dilek wrote:
> >
> >> Hi,
> >>
> >> just see this build-break on the last mile:
> >>
> >> [...]
> >>   OBJCOPY arch/x86/boot/compressed/vmlinux.bin
> >>   HOSTCC  arch/x86/boot/compressed/relocs
> >>   HOSTCC  arch/x86/boot/compressed/mkpiggy
> >> /mnt/sdb3/linux-kernel/linux-3.0/debian/build/source_i386_none/arch/x86/boot/compressed/relocs.c:
> >> In function 'print_absolute_symbols':
> >> /mnt/sdb3/linux-kernel/linux-3.0/debian/build/source_i386_none/arch/x86/boot/compressed/relocs.c:405:14:
> >> warning: variable 'sh_symtab' set but not used
> >> [-Wunused-but-set-variable]
> >> ERROR: "copy_from_user_overflow" [fs/binfmt_misc.ko] undefined!
> >> make[5]: *** [__modpost] Error 1
> >> make[4]: *** [modules] Error 2
> >> make[4]: *** Waiting for unfinished jobs....
> >>   RELOCS  arch/x86/boot/compressed/vmlinux.relocs
> >>   GZIP    arch/x86/boot/compressed/vmlinux.bin.gz
> >>   MKPIGGY arch/x86/boot/compressed/piggy.S
> >>   AS      arch/x86/boot/compressed/piggy.o
> >>   LD      arch/x86/boot/compressed/vmlinux
> >>   ZOFFSET arch/x86/boot/zoffset.h
> >>   OBJCOPY arch/x86/boot/vmlinux.bin
> >>   AS      arch/x86/boot/header.o
> >>   LD      arch/x86/boot/setup.elf
> >>   OBJCOPY arch/x86/boot/setup.bin
> >>   BUILD   arch/x86/boot/bzImage
> >> Setup is 15596 bytes (padded to 15872 bytes).
> >> System is 2471 kB
> >> CRC eb598167
> >> Kernel: arch/x86/boot/bzImage is ready  (#1)
> >> make[3]: *** [sub-make] Error 2
> >> make[2]: *** [all] Error 2
> >>
> >> I have these binfmt kernel-config options set:
> >>
> >> CONFIG_BINFMT_ELF=y
> >> # CONFIG_BINFMT_AOUT is not set
> >> CONFIG_BINFMT_MISC=m
> >
> > How does someone turn off this error message?
> >
> > I have:
> > # CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is not set
> > # CONFIG_STRICT_DEVMEM is not set
> >
> > and I still cannot get this error to go away (on x86_64).
> >
> >
> > ---
> > ~Randy
> > *** Remember to use Documentation/SubmitChecklist when testing your code ***
> >
> 
> Can you say with which linux-next version you saw this first?
> My last version was next-20110722 (which was OK).

It looks like 2011-0727 has lots of these errors in my randconfig builds,
but I can't say that they are all incorrect, so it's not very conclusive.

---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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