On Mon, 24 Oct 2022 18:02:32 -0700 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > On Mon, Oct 24, 2022 at 5:21 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > > > It's all about updating read only pages that are executable with a shadow mm. > > Right. And it doesn't actually need the mm at all, all it wants is the > kernel page tables. Which is why all the "dup_mmap()" stuff seems so > wrong. > > I suspect mm_alloc() does everything that VM actually needs. > > IOW, it shouldn't have used the fork() helper, it should have used the > execve() helper that actually starts out from a clean slate. Because a > clean slate is exactly what that code wants. > > No? > Something to look into. But I'm guessing that's best for the next merge window, and not for the -rc releases? -- Steve
