[Toybox] [PATCH] file: cope with invalid ELF notes.

[Rob Landley]

> -      if (sh_offset+sh_size>TT.len) goto bad;
> -
>        // An ELF note is a sequence of entries, each consisting of an
>        // ndhr followed by n_namesz+n_descsz bytes of data (each of those
>        // rounded up to the next 4 bytes, without this being reflected in
>        // the header byte counts themselves).
>        while (sh_size >= 3*4) { // Don't try to read a truncated entry.
> +        // Sanity check (https://github.com/landley/toybox/issues/99).
> +        if (sh_offset+sh_size>TT.len) goto bad;
> +

Fixed this one a slightly different way (commit 72af8466ac0e).

Rob