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objtool: Use sh_info to find the base for .rela sections

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ELF doesn't require .rela section names to match the base section. Use
the section index in sh_info to find the section instead of looking it
up by name.

LLD, for example, generates a .rela section that doesn't match the base
section name when we merge sections in a linker script for a binary
compiled with -ffunction-sections.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Sami Tolvanen 2020-04-21 11:25:01 -07:00 committed by Josh Poimboeuf
parent e000acc145
commit 1e968bf5ca
1 changed files with 1 additions and 1 deletions
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2
tools/objtool/elf.c
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@ -508,7 +508,7 @@ static int read_relas(struct elf *elf)
if (sec->sh.sh_type != SHT_RELA)
continue;
sec->base = find_section_by_name(elf, sec->name + 5);
sec->base = find_section_by_index(elf, sec->sh.sh_info);
if (!sec->base) {
WARN("can't find base section for rela section %s",
sec->name);