linux-kernel - [PATCH] fix verify_export

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Date:	Thu, 13 Mar 2008 09:04:17 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] fix verify_export_symbols()

When the newer export flavors were added, it was apparently forgotten
to add respective code here.
In order to not double the (source) size of the function, add some
abstraction to reduce code duplication.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 kernel/module.c |   39 +++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 20 deletions(-)

--- linux-2.6.25-rc5/kernel/module.c	2008-03-10 13:24:35.000000000 +0100
+++ 2.6.25-rc5-verify-export-symbols/kernel/module.c	2008-03-04 11:23:05.000000000 +0100
@@ -1383,33 +1383,32 @@ EXPORT_SYMBOL_GPL(__symbol_get);
  */
 static int verify_export_symbols(struct module *mod)
 {
-	const char *name = NULL;
-	unsigned long i, ret = 0;
+	const char *name;
+	unsigned int i;
 	struct module *owner;
 	const unsigned long *crc;
 
-	for (i = 0; i < mod->num_syms; i++)
-		if (!IS_ERR_VALUE(__find_symbol(mod->syms[i].name,
-							&owner, &crc, 1))) {
-			name = mod->syms[i].name;
-			ret = -ENOEXEC;
-			goto dup;
-		}
+#define VERIFY(syms) \
+	for (i = 0; i < mod->num_##syms; i++) { \
+		name = mod->syms[i].name; \
+		if (!IS_ERR_VALUE(__find_symbol(name, &owner, &crc, 1))) \
+			goto dup; \
+	}
 
-	for (i = 0; i < mod->num_gpl_syms; i++)
-		if (!IS_ERR_VALUE(__find_symbol(mod->gpl_syms[i].name,
-							&owner, &crc, 1))) {
-			name = mod->gpl_syms[i].name;
-			ret = -ENOEXEC;
-			goto dup;
-		}
+	VERIFY(syms);
+	VERIFY(gpl_syms);
+	VERIFY(gpl_future_syms);
+	VERIFY(unused_syms);
+	VERIFY(unused_gpl_syms);
+#undef VERIFY
+
+	return 0;
 
 dup:
-	if (ret)
-		printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
-			mod->name, name, module_name(owner));
+	printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
+		mod->name, name, module_name(owner));
 
-	return ret;
+	return -ENOEXEC;
 }
 
 /* Change all symbols so that st_value encodes the pointer directly. */



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