[#JRUBY-2453] Etc.getpwnam crashes JVM on Linux

JRuby

Etc.getpwnam crashes JVM on Linux

Created: 26/Apr/08 10:41 AM Updated: 04/Jul/08 09:07 AM

Component/s:

Core Classes/Modules

Affects Version/s:

JRuby 1.1.1

Fix Version/s:

JRuby 1.1.2

Time Tracking:

Not Specified

File Attachments:	1. jna-posix-passwd.patch (19 kb) 2. linux-passwd.patch (0.8 kb)
Environment:	Latest JRuby 1.1.1

Description

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Etc.getpwnam(`whoami`.strip) crashes JVM on Linux (Ubuntu 8.04 x32)

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0xb527ace9, pid=31094, tid=3085126544
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0_03-b05 mixed mode, sharing)
# Problematic frame:
# C  [jna51575.tmp+0x7ce9]
#
# An error report file with more information is saved as hs_err_pid31094.log
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#
Aborted

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Wayne Meissner - 29/Apr/08 01:28 AM

This patch creates separate Passwd structs for each OS, and maps them to the pointer returned from getpwnam() via a TypeMapper. Only tested on MacOS, but the linux and solaris ones should just need tweaking for any missing fields.

Not sure if this is the most understandable way to do it, as it uses a TypeMapper for LibC. Its less intrusive to the interface files, but may be somewhat opaque to someone who is trying to understand how the posix layer works.