[PATCH] module: strlen_user() race fix

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index e058aedf6b93..5aad477ddc79 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1670,6 +1670,9 @@ static struct module *load_module(void __user *umod,
                 goto free_mod;
         }
 
+        /* Userspace could have altered the string after the strlen_user() */
+        args[arglen - 1] = '\0';
+
         if (find_module(mod->name)) {
                 err = -EEXIST;
                 goto free_mod;