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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/kernel/params.c
....@@ -1,19 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* Helpers for initial module or kernel cmdline parsing
23    Copyright (C) 2001 Rusty Russell.
34 
4
-    This program is free software; you can redistribute it and/or modify
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-    it under the terms of the GNU General Public License as published by
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-    the Free Software Foundation; either version 2 of the License, or
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-    (at your option) any later version.
8
-
9
-    This program is distributed in the hope that it will be useful,
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-    but WITHOUT ANY WARRANTY; without even the implied warranty of
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-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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-    GNU General Public License for more details.
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-
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-    You should have received a copy of the GNU General Public License
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-    along with this program; if not, write to the Free Software
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-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
175 */
186 #include <linux/kernel.h>
197 #include <linux/string.h>
....@@ -24,6 +12,7 @@
2412 #include <linux/err.h>
2513 #include <linux/slab.h>
2614 #include <linux/ctype.h>
15
+#include <linux/security.h>
2716 
2817 #ifdef CONFIG_SYSFS
2918 /* Protects all built-in parameters, modules use their own param_lock */
....@@ -108,13 +97,19 @@
10897 	return parameqn(a, b, strlen(a)+1);
10998 }
11099 
111
-static void param_check_unsafe(const struct kernel_param *kp)
100
+static bool param_check_unsafe(const struct kernel_param *kp)
112101 {
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+	if (kp->flags & KERNEL_PARAM_FL_HWPARAM &&
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+	    security_locked_down(LOCKDOWN_MODULE_PARAMETERS))
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+		return false;
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+
113106 	if (kp->flags & KERNEL_PARAM_FL_UNSAFE) {
114107 		pr_notice("Setting dangerous option %s - tainting kernel\n",
115108 			  kp->name);
116109 		add_taint(TAINT_USER, LOCKDEP_STILL_OK);
117110 	}
111
+
112
+	return true;
118113 }
119114 
120115 static int parse_one(char *param,
....@@ -144,8 +139,10 @@
144139 			pr_debug("handling %s with %p\n", param,
145140 				params[i].ops->set);
146141 			kernel_param_lock(params[i].mod);
147
-			param_check_unsafe(&params[i]);
148
-			err = params[i].ops->set(val, &params[i]);
142
+			if (param_check_unsafe(&params[i]))
143
+				err = params[i].ops->set(val, &params[i]);
144
+			else
145
+				err = -EPERM;
149146 			kernel_param_unlock(params[i].mod);
150147 			return err;
151148 		}
....@@ -236,14 +233,15 @@
236233 	EXPORT_SYMBOL(param_ops_##name)
237234 
238235 
239
-STANDARD_PARAM_DEF(byte,	unsigned char,		"%hhu", kstrtou8);
240
-STANDARD_PARAM_DEF(short,	short,			"%hi",  kstrtos16);
241
-STANDARD_PARAM_DEF(ushort,	unsigned short,		"%hu",  kstrtou16);
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-STANDARD_PARAM_DEF(int,		int,			"%i",   kstrtoint);
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-STANDARD_PARAM_DEF(uint,	unsigned int,		"%u",   kstrtouint);
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-STANDARD_PARAM_DEF(long,	long,			"%li",  kstrtol);
245
-STANDARD_PARAM_DEF(ulong,	unsigned long,		"%lu",  kstrtoul);
246
-STANDARD_PARAM_DEF(ullong,	unsigned long long,	"%llu", kstrtoull);
236
+STANDARD_PARAM_DEF(byte,	unsigned char,		"%hhu",		kstrtou8);
237
+STANDARD_PARAM_DEF(short,	short,			"%hi",		kstrtos16);
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+STANDARD_PARAM_DEF(ushort,	unsigned short,		"%hu",		kstrtou16);
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+STANDARD_PARAM_DEF(int,		int,			"%i",		kstrtoint);
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+STANDARD_PARAM_DEF(uint,	unsigned int,		"%u",		kstrtouint);
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+STANDARD_PARAM_DEF(long,	long,			"%li",		kstrtol);
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+STANDARD_PARAM_DEF(ulong,	unsigned long,		"%lu",		kstrtoul);
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+STANDARD_PARAM_DEF(ullong,	unsigned long long,	"%llu",		kstrtoull);
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+STANDARD_PARAM_DEF(hexint,	unsigned int,		"%#08x", 	kstrtouint);
247245 
248246 int param_set_charp(const char *val, const struct kernel_param *kp)
249247 {
....@@ -532,7 +530,7 @@
532530 {
533531 	unsigned int num;
534532 	struct attribute_group grp;
535
-	struct param_attribute attrs[0];
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+	struct param_attribute attrs[];
536534 };
537535 
538536 #ifdef CONFIG_SYSFS
....@@ -565,8 +563,10 @@
565563 		return -EPERM;
566564 
567565 	kernel_param_lock(mk->mod);
568
-	param_check_unsafe(attribute->param);
569
-	err = attribute->param->ops->set(buf, attribute->param);
566
+	if (param_check_unsafe(attribute->param))
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+		err = attribute->param->ops->set(buf, attribute->param);
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+	else
569
+		err = -EPERM;
570570 	kernel_param_unlock(mk->mod);
571571 	if (!err)
572572 		return len;
....@@ -924,7 +924,6 @@
924924 };
925925 
926926 struct kset *module_kset;
927
-EXPORT_SYMBOL_GPL(module_kset);
928927 int module_sysfs_initialized;
929928 
930929 static void module_kobj_release(struct kobject *kobj)
....@@ -937,7 +936,6 @@
937936 	.release   =	module_kobj_release,
938937 	.sysfs_ops =	&module_sysfs_ops,
939938 };
940
-EXPORT_SYMBOL_GPL(module_ktype);
941939 
942940 /*
943941  * param_sysfs_init - wrapper for built-in params support
....@@ -957,10 +955,6 @@
957955 
958956 	return 0;
959957 }
960
-#ifdef CONFIG_ROCKCHIP_THUNDER_BOOT
961
-arch_initcall_sync(param_sysfs_init);
962
-#else
963958 subsys_initcall(param_sysfs_init);
964
-#endif
965959 
966960 #endif /* CONFIG_SYSFS */