proc: reject "." and ".." as filenames

[muen/linux.git] / fs / proc / generic.c

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 800247a256c9395b54fbb4f0d25b3fb72c6a3948..5dad2e89007bf841fee2426636e9bcb961b10ff2 100644 (file)
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -366,6 +366,14 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
                WARN(1, "name len %u\n", qstr.len);
                return NULL;
        }
+       if (qstr.len == 1 && fn[0] == '.') {
+               WARN(1, "name '.'\n");
+               return NULL;
+       }
+       if (qstr.len == 2 && fn[0] == '.' && fn[1] == '.') {
+               WARN(1, "name '..'\n");
+               return NULL;
+       }
        if (*parent == &proc_root && name_to_int(&qstr) != ~0U) {
                WARN(1, "create '/proc/%s' by hand\n", qstr.name);
                return NULL;