[PATCH] elf: dl-minimal malloc needs to respect fundamental alignment

[H.J. Lu]

On Tue, Jun 21, 2016 at 4:17 AM, Florian Weimer <fweimer@redhat.com> wrote:
> If malloc is used instead of memalign for small alignments,
> malloc needs to provide the ABI-required alignment.
>
> 2016-06-21  Florian Weimer  <fweimer@redhat.com>
>
>         * elf/dl-minimal.c (malloc): Allocate with fundamental alignment.
>
> diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
> index c8a8f8d..2d7d139 100644
> --- a/elf/dl-minimal.c
> +++ b/elf/dl-minimal.c
> @@ -27,6 +27,7 @@
>  #include <sys/types.h>
>  #include <ldsodefs.h>
>  #include <_itoa.h>
> +#include <stdalign.h>
>
>  #include <assert.h>
>
> @@ -90,7 +91,7 @@ __libc_memalign (size_t align, size_t n)
>  void * weak_function
>  malloc (size_t n)
>  {
> -  return __libc_memalign (sizeof (double), n);
> +  return __libc_memalign (_Alignof (max_align_t), n);
>  }
>
>  /* We use this function occasionally since the real implementation may

We also have MALLOC_ALIGNMENT in malloc.  Should they be consistent?

-- 
H.J.