Re: [PATCH 1/1] binutils-native: do_compile failed on Ubuntu 12.10

[Saul Wold <sgw@linux.intel.com>]

On 11/21/2012 01:24 AM, Hongxu Jia wrote:
> binutils-native do_compile failed on Ubuntu 12.10:
> ...
> error: call to '__warn_memset_zero_len' declared with attribute warning:
> memset used with constant zero length parameter; this could be due to
> transposed parameters [-Werror]
> ...
>
> When compiling binutils-native, option "--enable-targets=all" makes
> oasys.c compiled and option "-Werror" makes warning treated as error,
> so both of the options make the compile warning of oasys.c cause
> binutils-native compile failed.
>
This patch is not needed for 2.23 since it's been fixed there.

Sau!

> The warning caused by /usr/include/x86_64-linux-gnu/bits/string3.h:82
> in Ubuntu 12.10, here is the code:
> __extern_always_inline void *
> __NTH (memset (void *__dest, int __ch, size_t __len))
> {
>    if (__builtin_constant_p (__len) && __len == 0
>        && (!__builtin_constant_p (__ch) || __ch != 0))
>      {
>        __warn_memset_zero_len ();
>        return __dest;
>      }
>    return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
> }
>
> In oasys.c, invoking memset without checking len nonzero caused the
> warning.
>
> Add len nonzero checking when invoke memset in oasys.c to remove the
> compile warning could fix the problem.
>
> [YOCTO #3464]
> Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
> ---
>   meta/recipes-devtools/binutils/binutils-2.22.inc   |    3 +-
>   .../binutils-check-size-before-memset.patch        |   43 ++++++++++++++++++++
>   2 files changed, 45 insertions(+), 1 deletion(-)
>   create mode 100644 meta/recipes-devtools/binutils/binutils/binutils-check-size-before-memset.patch
>
> diff --git a/meta/recipes-devtools/binutils/binutils-2.22.inc b/meta/recipes-devtools/binutils/binutils-2.22.inc
> index 9697242..94cd17f 100644
> --- a/meta/recipes-devtools/binutils/binutils-2.22.inc
> +++ b/meta/recipes-devtools/binutils/binutils-2.22.inc
> @@ -1,4 +1,4 @@
> -PR = "r17"
> +PR = "r18"
>
>   LIC_FILES_CHKSUM="\
>       file://src-release;endline=17;md5=4830a9ef968f3b18dd5e9f2c00db2d35\
> @@ -45,6 +45,7 @@ SRC_URI = "\
>        file://0144-timer.cc-include-unistd.h.patch \
>        file://0166-2012-04-27-Doug-Kwan-dougkwan-google.com.patch \
>        file://0182-PR-ld-13991.patch \
> +     file://binutils-check-size-before-memset.patch \
>        "
>
>   SRC_URI[md5sum] = "ee0f10756c84979622b992a4a61ea3f5"
> diff --git a/meta/recipes-devtools/binutils/binutils/binutils-check-size-before-memset.patch b/meta/recipes-devtools/binutils/binutils/binutils-check-size-before-memset.patch
> new file mode 100644
> index 0000000..0baf42e
> --- /dev/null
> +++ b/meta/recipes-devtools/binutils/binutils/binutils-check-size-before-memset.patch
> @@ -0,0 +1,43 @@
> +bfd/oasys.c: check size before memset
> +
> +On Ubuntu 12.10 /usr/include/x86_64-linux-gnu/bits/string3.h:77
> +
> +__extern_always_inline void *
> +__NTH (memset (void *__dest, int __ch, size_t __len))
> +{
> +  if (__builtin_constant_p (__len) && __len == 0
> +      && (!__builtin_constant_p (__ch) || __ch != 0))
> +    {
> +      __warn_memset_zero_len ();
> +      return __dest;
> +    }
> +  return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
> +}
> +
> +The "memset(void *s, int c, size_t n)" will warn if the "n" is zero,
> +check the value of "n" before memset will fix the problem.
> +
> +Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
> +
> +Upstream-Status: Pending
> +---
> + binutils-2.22/bfd/oasys.c |    4 +++-
> + 1 file changed, 3 insertions(+), 1 deletion(-)
> +
> +diff --git a/bfd/oasys.c b/bfd/oasys.c
> +--- a/bfd/oasys.c
> ++++ b/bfd/oasys.c
> +@@ -908,7 +908,9 @@ oasys_write_header (bfd *abfd)
> +     length = sizeof (r.module_name);
> +
> +   (void) memcpy (r.module_name, abfd->filename, length);
> +-  (void) memset (r.module_name + length, ' ', sizeof (r.module_name) - length);
> ++
> ++  if (sizeof (r.module_name) > length)
> ++    (void) memset (r.module_name + length, ' ', sizeof (r.module_name) - length);
> +
> +   r.version_number = OASYS_VERSION_NUMBER;
> +   r.rev_number = OASYS_REV_NUMBER;
> +--
> +1.7.10.4
> +
>