Commit 9f88b906 authored Jul 03, 2014 by Jan Beulich Committed by H. Peter Anvin Jul 10, 2014

x86-64, vdso: Fix vDSO build breakage due to empty .rela.dyn



Certain ld versions (observed with 2.20.0) put an empty .rela.dyn
section into shared object files, breaking the assumption on the number
of sections to be copied to the final output. Simply discard any empty
SHT_REL and SHT_RELA sections to address this.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Link: http://lkml.kernel.org/r/53B5861E02000078000204D1@mail.emea.novell.com


Acked-by: Andy Lutomirski <luto@amacapital.net>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Tested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

parent cd3de83f

arch/x86/vdso/vdso2c.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -93,6 +93,9 @@ static void BITSFUNC(copy_section)(struct BITSFUNC(fake_sections) *out,
		uint64_t flags = GET_LE(&in->sh_flags);

		bool copy = flags & SHF_ALLOC &&
		(GET_LE(&in->sh_size) \|\|
		(GET_LE(&in->sh_type) != SHT_RELA &&
		GET_LE(&in->sh_type) != SHT_REL)) &&
		strcmp(name, ".altinstructions") &&
		strcmp(name, ".altinstr_replacement");

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