https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277863
Bug ID: 277863
Summary: Possible regression in mktime(3)
Product: Base System
Version: 14.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: misc
Assignee: b...@freebsd.org
Reporter: nson...@outlook.com
Attachment #249371 text/plain
mime type:
Created attachment 249371
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=249371&action=edit
Code that triggers the mktime bug
The following works on FreeBSD 13.0-RELEASE amd64 but fails on 14.0-RELEASE
amd64 (code included as an attachment):
#
# freebsd-version
13.0-RELEASE
#
# uname -m
amd64
#
# cat mktime_bug.c
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <time.h>
int
main(void)
{
struct tm time_buf = {
.tm_sec = 0,
.tm_min = 0,
.tm_hour = 0,
.tm_mday = 1,
.tm_mon = 0,
.tm_year = 69,
.tm_wday = 3,
.tm_yday = 0,
.tm_isdst = 0,
.tm_zone = "CET",
};
errno = 0;
time_t const unix_time = mktime(&time_buf);
if (errno)
err(EX_DATAERR, "mktime failed");
printf("Unix time is: %ld\n", unix_time);
return 0;
}
#
# cc -g -O0 -o mktime_bug mktime_bug.c
# ./mktime_bug
Unix time is: -31539600
#
Whereas on 14.0-RELEASE:
$ freebsd-version
14.0-RELEASE-p5
$
$ uname -m
amd64
$
$ cc -g -O0 -o mktime_bug mktime_bug.c
$ ./mktime_bug
mktime_bug: mktime failed: Value too large to be stored in data type
$
Note that the requested year is 1969 - the bug is possibly related to this
fact. This might be a regression due to a version bump of tzcode.
This bug was discovered due to a test failure in schilytools at
https://codeberg.org/schilytools/schilytools/issues/66.
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