linux-kernel - [tip: objtool/core] objtool: Use sh_info to find the base for .rela sections

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Message-ID: <158759428485.28353.15005772572257518607.tip-bot2@tip-bot2>
Date:   Wed, 22 Apr 2020 22:24:44 -0000
From:   "tip-bot2 for Sami Tolvanen" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Kees Cook <keescook@...omium.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/core] objtool: Use sh_info to find the base for .rela sections

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     e2ccbff8f02d6b140b8ee71108264686c19b1c78
Gitweb:        https://git.kernel.org/tip/e2ccbff8f02d6b140b8ee71108264686c19b1c78
Author:        Sami Tolvanen <samitolvanen@...gle.com>
AuthorDate:    Tue, 21 Apr 2020 11:25:01 -07:00
Committer:     Josh Poimboeuf <jpoimboe@...hat.com>
CommitterDate: Tue, 21 Apr 2020 18:49:15 -05:00

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

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@...gle.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
---
 tools/objtool/elf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index c4857fa..c20dfe1 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -468,7 +468,7 @@ 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);