Re: [syzbot] [fs?] [efi?] BUG: unable to handle kernel paging request in alloc_fs_context

Ard Biesheuvel
2025-05-22T13:47:56Z

On Thu, 22 May 2025 at 14:24, Christian Brauner <brauner@kernel.org> wrote:
>
> On Wed, May 21, 2025 at 07:28:34PM +0200, Ard Biesheuvel wrote:
> > (cc James, Al, Christian)
> >
> > Please see the splat below.
> >
> > The NULL dereference is due to get_cred() in alloc_fs_context()
> > attempting to increment current->cred->usage while current->cred ==
> > NULL, and this is a result of the fact that PM notifier call chain is
> > called while the task is exiting.
> >
> > IIRC, the intent was for commit
> >
> > 11092db5b573 efivarfs: fix NULL dereference on resume
> >
> > to be replaced at some point with something more robust; might that
> > address this issue as well?
>
> Yes. It's in the merge queue for v6.16 which kills off all that
> vfs_kern_mount() stuff.

Excellent, thanks for the update.