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    SubjectRe: 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, 6 Aug 2011 19:56:00 +0200 Alessandro Suardi wrote:

    > On Sat, Aug 6, 2011 at 7:49 PM, Miles Lane <miles.lane@gmail.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@gmail.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.

    Even after you disable this kconfig option, you probably also still
    need this patch (unless it's already applied):
    http://marc.info/?l=linux-kernel&m=131196593501269&w=2

    ---
    ~Randy
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