[Bug time/26833] New: adjtime() with delta == NULL segfaults on armv7 32bit platform

["matthias.gerstner at nefkom dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26833

            Bug ID: 26833
           Summary: adjtime() with delta == NULL segfaults on armv7 32bit
                    platform
           Product: glibc
           Version: 2.32
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: matthias.gerstner at nefkom dot net
  Target Milestone: ---

I recently updated glibc from release 2.31 to release 2.32 on Gentoo Linux
running on a 32-bit armv7 machine. Ever since that the ntpd from openntpd
doesn't startup any more.

Digging deeper I found that the forked 'ntp_main' instance of ntpd dies with a
SIGSEGV when executing the the adjtime() glibc function call in the following
function:


```
double                                                                          
getoffset(void)                                                                 
{                                                                               
        struct timeval  tv;                                                     
>>>>    if (adjtime(NULL, &tv) == -1)                                             
                return (0.0);                                                   
        return (tv.tv_sec + 1.0e-6 * tv.tv_usec);                               
}
```

The issue seems to stem from glibc git commit
0308077e3a4ff1c123cdddd311f55a2ecdd3115c where the newly introduced __adjtime
32-bit wrapper cannot handle a NULL pointer itv input parameter.

```
+#if __TIMESIZE != 64
+libc_hidden_def (__adjtime64)
+
+int
+__adjtime (const struct timeval *itv, struct timeval *otv)
+{
+  struct __timeval64 itv64, otv64;
+  int retval;
+
+  itv64 = valid_timeval_to_timeval64 (*itv);
+  retval = __adjtime64 (&itv64, otv != NULL ? &otv64 : NULL);
+  if (otv != NULL)
+    *otv = valid_timeval64_to_timeval (otv64);
+
+  return retval;
+}
+#endif
```

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