GitLab

The patch 0015-syslogd-adjust-timezone-option.patch should probably set the year in the struct tm to something representable. Not sure if this is 32 bit bug only.

Package Version: busybox 1.26.2-r7, Intel 32 bit.

To reproduce:

# service syslog stop
# syslogd -N -O - -Z

In other terminal:

$ logger -t test test

Expected output: the correct date

Actual output:

Dec 31 23:59:59 vm user.notice test: test

This happens because mktime actually fails with EOVERFLOW (tm_year is initialized to 0 = the year 1900 which is not representable in 32 bit time_t) and returns (time_t)-1.

Simple program to reproduce below:

#include <stdio.h>
#include <time.h>

void doit(const char *ts, struct tm *nowtm) {
    time_t tm;
    if (!strptime(ts, "%b %e %T", nowtm)) {
        fprintf(stderr, "Err strptime\n");
    }
    printf("Year is %d\n", nowtm->tm_year);
    tm = mktime(nowtm);
    if (tm == (time_t)-1) {
        perror("mktime");
    }
    printf("Parsed as: %s\n", ctime(&tm));
}

int main() {
    const char *ts = "Oct 22 02:17:13";
    struct tm origtm = { .tm_isdst = 0 };
    struct tm fixedtm = { .tm_isdst = 0, .tm_year=100 };
    tzset();
    printf("With original:\n");
    doit(ts, &origtm);
    printf("With fixed:\n");
    doit(ts, &fixedtm);
}

(from redmine: issue id 8028, created on 2017-10-22)