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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>
This commit is contained in:
Jan Beulich 2014-07-03 15:34:38 +01:00 committed by H. Peter Anvin
parent cd3de83f14
commit 9f88b906b4
1 changed files with 3 additions and 0 deletions
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3
arch/x86/vdso/vdso2c.h
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@ -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");