Re: [PATCH] mm/secretmem: fix panic when growing a memfd_secret

On Thu, Mar 24, 2022 at 02:09:09PM -0700, Axel Rasmussen wrote:

This patch avoids the panic by implementing a custom setattr for memfd_secret, which detects resizes specifically (setting the size for the first time works just fine, since there are no existing pages to try to zero), and rejects them as not supported (ENOTSUP).

Isn't ENOTTY the normal return value for this? Or even ENOSYS?