[Bug time/27662] New: adjtimex/clock_adjtime: y2038 regression causes segfault or wrong return value

["adrian.ratiu at collabora dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27662

            Bug ID: 27662
           Summary: adjtimex/clock_adjtime: y2038 regression causes
                    segfault or wrong return value
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: adrian.ratiu at collabora dot com
  Target Milestone: ---

This is a continuation of BZ #26833 for adjtimex/clock_adjtime.

Example of segfault from a 32bit armv7 system:

$ cat timex.c

#include <errno.h>
#include <string.h>
#include <sys/timex.h>

int main(void) {
  int ret;
  /* Test with nullptr buffer. Should fail with EFAULT. */
  ret = adjtimex(NULL);
  if (ret == -EFAULT)
    return 0;
  return 1;
}

$ armv7a-cros-linux-gnueabihf-gcc -o main timex.c -static -g
$ qemu-arm main
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault.

I believe the following commits need fixing to correctly handle the NULL case:

8f8a6cae48 y2038: linux: Provide ___adjtimex64 implementation
63ff4a6d17 y2038: linux: Provide __clock_adjtime64 implementation

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