Re: lib/60452: gmtime, gmtime_r put wrong time zone into result

The following reply was made to PR lib/60452; it has been noted by GNATS.

From: Thomas Klausner <[email protected]>
To: Robert Elz <[email protected]>
Cc: [email protected]
Subject: Re: lib/60452: gmtime, gmtime_r put wrong time zone into result
Date: Thu, 16 Jul 2026 20:46:25 +0200

 On Fri, Jul 17, 2026 at 01:40:46AM +0100, Robert Elz wrote:
 > It is easy to test which that is, simply make the f_gmtime() function
 > in your test be:
 > 
 > void f_gmtime(time_t secs, struct tm *tmp) {
 >   memset(tmp, 0, sizeof(*tmp));
 >   if (gmtime_r(&secs, tmp) == NULL)
 >     err(1, "gmtime_r failed");
 >   tmp->tm_gmtoff = -1234;
 >   tmp->tm_zone = (char *)-1234;
 > }
 > 
 > and see what the effect is on those systems.
 
 macOS:
 
 cc     jq.c   -o jq
 ./test.sh: line 3: 53331 Segmentation fault: 11  TZ=Etc/GMT+7 ./jq
 ./test.sh: line 4: 53332 Segmentation fault: 11  ./jq
 
 Debian:
 
 cc     jq.c   -o jq
 Segmentation fault
 Segmentation fault
 
 FreeBSD:
 
 cc -O2 -pipe  jq.c  -o jq
 In-address space security exception (core dumped)
 In-address space security exception (core dumped)
 
  Thomas