Re: [PATCH 3/3] x86/alternative: make kernel ITS thunks read-only

On Wed, May 28, 2025 at 05:58:21PM +0200, Peter Zijlstra wrote:

On Wed, May 28, 2025 at 03:30:33PM +0200, Jürgen Groß wrote:

...

Have a look at its_fini_mod().

Oh, that's what you mean. But this still isn't very nice, you now have restore_rox() without make_temp_rw(), which was the intended usage pattern.

Bah, I hate how execmem works different for !PSE, Mike, you see a sane way to fix this?

The least ugly thing I could think of is to replace the current pattern of

execmem_alloc() exemem_make_temp_rw() /* update */ execmem_restore_rox()

with

execmem_alloc_rw() /* update */ execmem_protect()

but I still haven't got to try it.