From: Davi Arnaut <davi.arnaut@gmail.com>
Date: Fri, 24 Mar 2006 11:18:43 +0000 (-0800)
Subject: [PATCH] strndup_user: convert module
X-Git-Tag: v2.6.17-rc1~869
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24277dda3a54aa5e6265487e1a3091e27f3c0c45;p=linux-2.6

[PATCH] strndup_user: convert module

Change hand-coded userspace string copying to strndup_user.

Signed-off-by: Davi Arnaut <davi.arnaut@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/kernel/module.c b/kernel/module.c
index fb40429908..54623c714b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1572,7 +1572,6 @@ static struct module *load_module(void __user *umod,
 		exportindex, modindex, obsparmindex, infoindex, gplindex,
 		crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
 		gplfuturecrcindex;
-	long arglen;
 	struct module *mod;
 	long err = 0;
 	void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -1691,23 +1690,11 @@ static struct module *load_module(void __user *umod,
 	}
 
 	/* Now copy in args */
-	arglen = strlen_user(uargs);
-	if (!arglen) {
-		err = -EFAULT;
-		goto free_hdr;
-	}
-	args = kmalloc(arglen, GFP_KERNEL);
-	if (!args) {
-		err = -ENOMEM;
+	args = strndup_user(uargs, ~0UL >> 1);
+	if (IS_ERR(args)) {
+		err = PTR_ERR(args);
 		goto free_hdr;
 	}
-	if (copy_from_user(args, uargs, arglen) != 0) {
-		err = -EFAULT;
-		goto free_mod;
-	}
-
-	/* Userspace could have altered the string after the strlen_user() */
-	args[arglen - 1] = '\0';
 
 	if (find_module(mod->name)) {
 		err = -EEXIST;