linux-kernel - [PATCH v4 2/3] vmlinux: Avoid weak reference to notes section

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Message-ID: <20240415162041.2491523-7-ardb+git@google.com>
Date: Mon, 15 Apr 2024 18:20:44 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, linux-arch@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, bpf@...r.kernel.org, 
	Andrii Nakryiko <andrii@...nel.org>, Jiri Olsa <olsajiri@...il.com>
Subject: [PATCH v4 2/3] vmlinux: Avoid weak reference to notes section

From: Ard Biesheuvel <ardb@...nel.org>

Weak references are references that are permitted to remain unsatisfied
in the final link. This means they cannot be implemented using place
relative relocations, resulting in GOT entries when using position
independent code generation.

The notes section should always exist, so the weak annotations can be
omitted.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 kernel/ksysfs.c | 4 ++--
 lib/buildid.c   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 495b69a71a5d..07fb5987b42b 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -228,8 +228,8 @@ KERNEL_ATTR_RW(rcu_normal);
 /*
  * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
  */
-extern const void __start_notes __weak;
-extern const void __stop_notes __weak;
+extern const void __start_notes;
+extern const void __stop_notes;
 #define	notes_size (&__stop_notes - &__start_notes)
 
 static ssize_t notes_read(struct file *filp, struct kobject *kobj,
diff --git a/lib/buildid.c b/lib/buildid.c
index 898301b49eb6..7954dd92e36c 100644
--- a/lib/buildid.c
+++ b/lib/buildid.c
@@ -182,8 +182,8 @@ unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init;
  */
 void __init init_vmlinux_build_id(void)
 {
-	extern const void __start_notes __weak;
-	extern const void __stop_notes __weak;
+	extern const void __start_notes;
+	extern const void __stop_notes;
 	unsigned int size = &__stop_notes - &__start_notes;
 
 	build_id_parse_buf(&__start_notes, vmlinux_build_id, size);
-- 
2.44.0.683.g7961c838ac-goog