Re: [Qemu-devel] [PATCH 14/14] Add -fstack-protector-all to CFLAGS

["Kirill A. Shutemov" <kirill@shutemov.name>]

On Thu, Dec 31, 2009 at 12:58 PM, Arnaud Patard
<arnaud.patard@rtp-net.org> wrote:
> "Kirill A. Shutemov" <kirill@shutemov.name> writes:
> Hi,
>
>> -fstack-protector-all emit extra code to check for buffer overflows,
>> such as stack smashing attacks.  This is done by adding a guard
>> variable to functions with vulnerable objects.
>>
>> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
>> ---
>>  configure |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/configure b/configure
>> index 0cdcdb3..16b70d8 100755
>> --- a/configure
>> +++ b/configure
>> @@ -98,6 +98,7 @@ QEMU_CFLAGS="-Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes $
>>  QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
>>  QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
>>  QEMU_CFLAGS="-D_FORTIFY_SOURCE=2 $QEMU_CFLAGS"
>> +QEMU_CFLAGS="-fstack-protector-all $QEMU_CFLAGS"
>
> afaik not all arches out there are supporting
> -fstack-protector-all (to be more precise, some have no stack protector
> support at all). iirc, gcc will emit a warning and still compile
> but would be nice to avoid a warning.

Thanks. Will be fixed.