linux-kernel - [PATCH v3 21/64] objtool: Check for missing annotation entries in read

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Message-ID: <8ccb86bda68d31f29137ee25d027e9d293307327.1750980517.git.jpoimboe@kernel.org>
Date: Thu, 26 Jun 2025 16:55:08 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org,
	Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>,
	Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>,
	Dylan Hatch <dylanbhatch@...gle.com>
Subject: [PATCH v3 21/64] objtool: Check for missing annotation entries in read_annotate()

Add a sanity check to make sure none of the relocations for the
.discard.annotate_insn section have gone missing.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/check.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index b5257a959458..fe18f9f5dbef 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2292,6 +2292,11 @@ static int read_annotate(struct objtool_file *file,
 		sec->sh.sh_entsize = 8;
 	}
 
+	if (sec_num_entries(sec) != sec_num_entries(sec->rsec)) {
+		ERROR("bad .discard.annotate_insn section: missing relocs");
+		return -1;
+	}
+
 	for_each_reloc(sec->rsec, reloc) {
 		type = *(u32 *)(sec->data->d_buf + (reloc_idx(reloc) * sec->sh.sh_entsize) + 4);
 
-- 
2.49.0