[PATCH] elf: Support vDSO with more than one PT_LOAD with v_addr starting at 0 (BZ 32583)

[Florian Weimer]

* Adhemerval Zanella:

> The setup_vdso assumes that vDSO will contain only one PT_LOAD segment
> and that 0 is the sentinel for the start mapping address. Although the
> kernel avoids adding more than one PT_LOAD to avoid compatibility
> issues, there is no impending issue that prevents glibc from supporting
> vDSO with multiple PT_LOAD (as some wrapper tools do [1]).

[1] is a dangling reference.

The change as such seems fine.  Maybe add a comment that this check is
unnecessary on original Linux?

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian