linux-kernel - [PATCH 3/3] module: Make .static_call

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Message-ID: <20241223093840.29417-4-petr.pavlu@suse.com>
Date: Mon, 23 Dec 2024 10:37:49 +0100
From: Petr Pavlu <petr.pavlu@...e.com>
To: Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Jason Baron <jbaron@...mai.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ard Biesheuvel <ardb@...nel.org>
Cc: linux-modules@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] module: Make .static_call_sites read-only after init

Section .static_call_sites holds data structures that need to be sorted and
processed only at module load time. This initial processing happens in
static_call_add_module(), which is invoked as a callback to the
MODULE_STATE_COMING notification from prepare_coming_module().

The section is never modified afterwards. Make it therefore read-only after
module initialization to avoid any (non-)accidental modifications.

Signed-off-by: Petr Pavlu <petr.pavlu@...e.com>
---
 kernel/module/strict_rwx.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/module/strict_rwx.c b/kernel/module/strict_rwx.c
index 598f89195336..4ae5facab569 100644
--- a/kernel/module/strict_rwx.c
+++ b/kernel/module/strict_rwx.c
@@ -115,6 +115,15 @@ static const char *const ro_after_init[] = {
 	 * section, which are marked as such at module load time.
 	 */
 	"__jump_table",
+
+#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
+	/*
+	 * Section .static_call_sites holds data structures that need to be
+	 * sorted and processed at module load time but are never modified
+	 * afterwards.
+	 */
+	".static_call_sites",
+#endif
 };
 
 void module_mark_ro_after_init(const Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
-- 
2.43.0