14 Jun
2021
14 Jun
'21
6:02 p.m.
On Mon, Jun 14, 2021 at 9:45 AM Kees Cook keescook@chromium.org wrote:
/* A task may only write when it was the opener. */
if (file->private_data != current->mm)
if (!file->private_data || file->private_data != current->mm)
I don't think this is necessary.
If file->private_data is NULL, then the old test for private_data != current->mm will still work just fine.
Because if you can fool kernel threads to do the write for you, you have bigger security issues than that test.
Linus