pass creds to get_empty_filp(), make sure dentry_open() passes the right creds
... and rename get_empty_filp() to alloc_empty_file().
dentry_open() gets creds as argument, but the only thing that sees those is
security_file_open() - file->f_cred still ends up with current_cred(). For
almost all callers it's the same thing, but there are several broken cases.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/file_table.c b/fs/file_table.c
index 086c3f5..76cfa4c 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -101,9 +101,8 @@
* done, you will imbalance int the mount's writer count
* and a warning at __fput() time.
*/
-struct file *get_empty_filp(void)
+struct file *alloc_empty_file(const struct cred *cred)
{
- const struct cred *cred = current_cred();
static long old_max;
struct file *f;
int error;
@@ -161,7 +160,7 @@
{
struct file *file;
- file = get_empty_filp();
+ file = alloc_empty_file(current_cred());
if (IS_ERR(file))
return file;