Re: [PATCH net-next] modules: allow modprobe load regular elf binaries

[Andy Lutomirski]

> On Mar 9, 2018, at 10:17 AM, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> 

> 
> Hmm. I wish we had an "execute blob" model, but we really don't, and
> it would be hard/impossible to do without pinning the pages in memory.
> 

Why so hard?  We can already execute a struct file for execveat, and Alexei already has this working for umh. Surely we can make an immutable (as in even root canât write it) kernel-internal tmpfs file, execveat it, then unlink it. And /proc/PID/exe should be openable and readable.  The blob itself would be __initdata so it gets discarded after it lands in tmpfs.