Ubuntu
bsdmainutils package

ncal crashes with segmentation fault

Bug #1549850 reported by bugproxy
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
GLibC
Unknown
Unknown
bsdmainutils (Ubuntu)
Fix Released
Undecided
Dimitri John Ledkov
glibc (Ubuntu)
Invalid
Undecided
Dimitri John Ledkov

Bug Description

== Comment: #0 - Christoph Arenz <email address hidden> - 2016-02-24 09:27:23 ==
The ncal calendar program crashes with a segmentation fault.

test@s8315043:~$ ncal
Segmentation fault (core dumped)

Note that ncal is a symlink to cal and cal is working fine.

test@s8315043:~$ ls -l /usr/bin/cal /usr/bin/ncal
lrwxrwxrwx 1 root root 4 Feb 7 11:08 /usr/bin/cal -> ncal
-rwxr-xr-x 1 root root 33888 Feb 7 11:08 /usr/bin/ncal

arenz@oc6366361507:~$ cal
    February 2016
Su Mo Tu We Th Fr Sa
    1 2 3 4 5 6
 7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29

gdb session shows:
(gdb) run
Starting program: /usr/bin/ncal

Program received signal SIGSEGV, Segmentation fault.
__wcslen (s=0x0) at wcslen.c:32
32 wcslen.c: No such file or directory.

== Comment: #3 - Christoph Arenz <email address hidden> - 2016-02-24 11:52:20 ==
Package information for ncal/cal:
test@s8315043:~$ dpkg -l bsdmainutils
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============================-====================-====================-==================================================================
ii bsdmainutils 9.0.6ubuntu2 s390x collection of more utilities from FreeBSD

Revision history for this message
bugproxy (bugproxy) wrote : sosreport

Default Comment by Bridge

tags: added: architecture-s39064 bugnameltc-137759 severity-medium targetmilestone-inin1604
Revision history for this message
bugproxy (bugproxy) wrote : dbginfo output

Default Comment by Bridge

Changed in ubuntu:
assignee: nobody → Skipper Bug Screeners (skipper-screen-team)
dann frazier (dannf)
affects: ubuntu → bsdmainutils (Ubuntu)
dann frazier (dannf)
Changed in bsdmainutils (Ubuntu):
status: New → Confirmed
Revision history for this message
dann frazier (dannf) wrote :

Thanks for the report. The problem appears to be with how glibc's nl_langinfo() is returning values on s390x (or, at least, with how ncal *assumes* it will return them). Here's a short test program:

---
int main() {
  int i = (intptr_t)nl_langinfo(_NL_TIME_WEEK_1STDAY);
  printf("1ST DAY IS %d\n", i);
}
---
On x86, this, for most locales, will output:

$ ./test
1ST DAY IS 19971130

However, on s390x, it outputs:

$ ./test
1ST DAY IS 0

However, if you look at the full pointer, you can see that s390x does have the correct value in the top order bytes:

ubuntu@s390x:~$ cat test.c
#include <stdio.h>
#include <langinfo.h>
#include <stdint.h>

int main() {
  char *p = nl_langinfo(_NL_TIME_WEEK_1STDAY);
  printf("1ST DAY IS %p\n", p);
}

ubuntu@s390x:~$ gcc test.c -o test
ubuntu@s390x:~$ ./test
1ST DAY IS 0x130bc3a00000000

While on x86/arm64 it is in the lower bytes:
ubuntu@x86$ ./test
1ST DAY IS 0x130bc3a

Changed in glibc (Ubuntu):
assignee: nobody → Dimitri John Ledkov (xnox)
Changed in bsdmainutils (Ubuntu):
assignee: Skipper Bug Screeners (skipper-screen-team) → Dimitri John Ledkov (xnox)
Dimitri John Ledkov (xnox)
Changed in glibc (Ubuntu):
status: New → Invalid
Dimitri John Ledkov (xnox)
Changed in bsdmainutils (Ubuntu):
status: Confirmed → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package bsdmainutils - 9.0.6ubuntu3

---------------
bsdmainutils (9.0.6ubuntu3) xenial; urgency=medium

  * Fix ncal on big-endian platforms. LP: #1549850.

 -- Dimitri John Ledkov <email address hidden> Tue, 01 Mar 2016 11:34:26 +0000

Changed in bsdmainutils (Ubuntu):
status: Fix Committed → Fix Released
Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2016-03-08 09:01 EDT-------
Verified for bsdmainutils 9.0.6ubuntu3 on s390x.
ncal works now as expected. Thanks for fixing!
This bugzilla can be closed.

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