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[01/22] objtool: use sh_info to find the base for .rela sections

Message ID 20200624203200.78870-2-samitolvanen@google.com (mailing list archive)
State New, archived
Headers show
Series add support for Clang LTO | expand

Commit Message

Sami Tolvanen June 24, 2020, 8:31 p.m. UTC
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>
 tools/objtool/elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 84225679f96d..c1ba92abaa03 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -502,7 +502,7 @@  static int read_relas(struct elf *elf)
 		if (sec->sh.sh_type != SHT_RELA)
-		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",