[Bug build/22339] New: support/support_can_chroot.c (support_can_chroot): Should call chdir("/");

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22339

            Bug ID: 22339
           Summary: support/support_can_chroot.c (support_can_chroot):
                    Should call chdir("/");
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

We should set a good example by calling chdir("/"); immediately after the
chroot, anyone reading this should see that it's clear that we're following the
normative practice of "chroot+chdir."

This also has the added side-effect of silencing warnings in some security
related analysis of the support code.

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