[PATCH v4] elf: Only allow execute libc.so.6 directly [BZ #28453]

[Florian Weimer]

* H. J. Lu:

> +  /* With DT_NEEDED dependencies, it is a shared library.  Only allow
> +     execute libc.so directly.  */
> +  if (__glibc_unlikely (main_map->l_info[DT_NEEDED] != NULL))
> +    return (main_map->l_info[DT_SONAME] != NULL
> +	    && strncmp ("libc.so.6",
> +			((const char *) D_PTR (main_map, l_info[DT_STRTAB])
> +			 + main_map->l_info[DT_SONAME]->d_un.d_val),
> +			sizeof ("libc.so.6") - 1) == 0);

I don't think this works.  See /usr/bin/npc in Fedora, it has a soname.

Thanks,
Florian