linux-kernel - [RFC PATCH v2 1/2] module: Make module_flags_taint() accept a module's taints bitmap directly

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Message-Id: <20220419150334.3395019-2-atomlin@redhat.com>
Date:   Tue, 19 Apr 2022 16:03:33 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     mcgrof@...nel.org
Cc:     cl@...ux.com, pmladek@...e.com, mbenes@...e.cz,
        christophe.leroy@...roup.eu, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
        atomlin@...mlin.com, ghalat@...hat.com
Subject: [RFC PATCH v2 1/2] module: Make module_flags_taint() accept a module's taints bitmap directly

No functional change.

The purpose of this patch is to modify module_flags_taint() to accept a
module's taints bitmap as a parameter and modifies all users accordingly.
This is in preparation for module unload taint tracking support.

Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
---
 kernel/module/main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/module/main.c b/kernel/module/main.c
index 05a42d8fcd7a..ea78cec316dd 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -890,13 +890,13 @@ static inline int module_unload_init(struct module *mod)
 }
 #endif /* CONFIG_MODULE_UNLOAD */
 
-static size_t module_flags_taint(struct module *mod, char *buf)
+static size_t module_flags_taint(unsigned long taints, char *buf)
 {
 	size_t l = 0;
 	int i;
 
 	for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
-		if (taint_flags[i].module && test_bit(i, &mod->taints))
+		if (taint_flags[i].module && test_bit(i, &taints))
 			buf[l++] = taint_flags[i].c_true;
 	}
 
@@ -974,7 +974,7 @@ static ssize_t show_taint(struct module_attribute *mattr,
 {
 	size_t l;
 
-	l = module_flags_taint(mk->mod, buffer);
+	l = module_flags_taint(mk->mod->taints, buffer);
 	buffer[l++] = '\n';
 	return l;
 }
@@ -2993,7 +2993,7 @@ char *module_flags(struct module *mod, char *buf)
 	    mod->state == MODULE_STATE_GOING ||
 	    mod->state == MODULE_STATE_COMING) {
 		buf[bx++] = '(';
-		bx += module_flags_taint(mod, buf + bx);
+		bx += module_flags_taint(mod->taints, buf + bx);
 		/* Show a - for module-is-being-unloaded */
 		if (mod->state == MODULE_STATE_GOING)
 			buf[bx++] = '-';
-- 
2.34.1