linux-kernel - [PATCH v4 23/63] objtool: Check for missing annotation entries in read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <410930ca7c6ae41231cc4758ceb70c696b1192e6.1758067943.git.jpoimboe@kernel.org>
Date: Wed, 17 Sep 2025 09:03:31 -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>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v4 23/63] 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 bea9b124dcf48..fdb83a0a592a3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2293,6 +2293,11 @@ 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);
 		type = bswap_if_needed(file->elf, type);
-- 
2.50.0