[PATCH][BZ #13601] Retry read in ld.so if the entire ELF header is not read in

[Siddhesh Poyarekar]

Hi,

We currently assume that the operation to read in the DSO in
open_verify always reads in the entire ELF header.  This assumption is
wrong since the read syscall is free to return smaller chunks of data
and we ought to continue reading if that happens.  Attached patch does
exactly that.  I have verified that there are no regressions resulting
from this patch on x86_64 F-16, but I don't have a way to verify that
the split read works.  OK to commit?

Regards,
Siddhesh

ChangeLog:

	* elf/dl-load.c (open_verify): Retry read if the entire ELF
	header is not read in.
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