[release-branch.go1.24] os: hide SetFinalizer from users of Root
Currently Root embeds a root and calls SetFinalizer on &r.root. This
sets the finalizer on the outer root, which is visible to users of
os.Root, and thus they can mutate the finalizer attached to it.
This change modifies Root to not embed its inner root, but rather to
refer to it by pointer. This allows us to set the finalizer on this
independent inner object, preventing users of os.Root from changing the
finalizer. This follows the same pattern as os.File's finalizer.
Fixes #71617.
Change-Id: Ibd199bab1b3c877d5e12ef380fd4647b4e10221f
Reviewed-on: https://go-review.googlesource.com/c/go/+/647876
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
(cherry picked from commit
a704d39b29dfc21599f644909c0f98bbfa745cb4)
Reviewed-on: https://go-review.googlesource.com/c/go/+/648135
TryBot-Bypass: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>