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Bug #75873 pcntl_wexitstatus returns incorrect on Big_Endian platform (s390x)
Submitted: 2018-01-25 15:34 UTC Modified: 2018-02-23 22:59 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: samding at ca dot ibm dot com Assigned: cmb (profile)
Status: Closed Package: PCNTL related
PHP Version: 7.2.1 OS: RHEL7.2
Private report: No CVE-ID: None
View Developer Edit
 [2018-01-25 15:34 UTC] samding at ca dot ibm dot com 
Description:
------------
Test case "ext/pcntl/tests/001.phpt" show it result on big_endian platform:

"
Staring wait.h tests....

Testing pcntl_wifexited and wexitstatus....
Exited With: 0

Testing pcntl_wifsignaled....

Testing pcntl_wifstopped and pcntl_wstopsig....
"

Test script:
---------------
 sapi/cli/php ext/pcntl/tests/001.php

Expected result:
----------------
"pcntl_wifexited" should return "255"

Actual result:
--------------
"pcntl_wifexited" should return "0"

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 [2018-01-25 15:51 UTC] samding at ca dot ibm dot com 
See the code of "pcntl_wexitstatus" of ext/pcntl/pcntl.c

    841 PHP_FUNCTION(pcntl_wexitstatus)
    842 {
    843 #ifdef WEXITSTATUS
    844         zend_long status_word;
    845
    846         if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &status_word) == FAILURE) {
    847                return;
    848         }
    849         RETURN_LONG(WEXITSTATUS(status_word));
    850 #else
    851         RETURN_FALSE;
    852 #endif

Here status_word is long, but WEXITSTATUS needs the input as int.(https://www.gnu.org/software/libc/manual/html_node/Process-Completion-Status.html)
This is no problem on Little_Endian, but causes the problem on Big_Endian platform (s390x).

Have to cast it to int before running macro WEXITSTATUS:

    849         RETURN_LONG(WEXITSTATUS((int)status_word));

Similarly following function need to change:

pcntl_wifexited
pcntl_wifstopped
pcntl_wifsignaled
pcntl_wifcontinued
pcntl_wexitstatus
pcntl_wtermsig
pcntl_wstopsig
 [2018-02-23 22:59 UTC] cmb@php.net 
Automatic comment on behalf of samding@ca.ibm.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=78c1ef2adbd3f9383659326cc85e7f45fef639ae
Log: Fix #75873: pcntl_wexitstatus returns incorrect on Big_Endian platform (s390x)
 [2018-02-23 22:59 UTC] cmb@php.net
-Status: Open +Status: Closed
 [2018-02-23 22:59 UTC] cmb@php.net
-Assigned To: +Assigned To: cmb
 
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