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[perl #59766] Changing effective userid from root to normal user fails on Linux

# New Ticket Created by  huaraz@moeller.plus.com 
# Please include the string:  [perl #59766]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=59766 >



This is a bug report for perl from huaraz@moeller.plus.com,
generated with the help of perlbug 1.35 running under perl v5.8.8.


-----------------------------------------------------------------
[Please enter your report here]
When perl is used under root and the effective id has changed using 
$> perl can not any more access its own binary when spawning 
processes as perl tries to access /proc/self/exe (which points to 
/usr/bin/perl) and fails. This stops application to work (like 
Radiator a perl based radius server) on Linux.

This has been reported to Novell and the Linux Kernel group, but 
it was rejected as a bug.

See also:
https://bugzilla.novell.com/show_bug.cgi?id=365738
http://bugzilla.kernel.org/show_bug.cgi?id=10782

Markus

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=high
---
This perlbug was built using Perl v5.8.8 - Fri Jul 11 15:12:08 UTC 2008
It is being executed now by  Perl v5.8.8 - Fri Jul 11 15:08:48 UTC 2008.

Site configuration information for perl v5.8.8:

Configured by abuild at Fri Jul 11 15:08:48 UTC 2008.

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=linux, osvers=2.6.22, archname=i586-linux-thread-multi
    uname='linux cimarosa 2.6.22 #1 smp preempt rt 2008-06-04 00:52:17 +0200 i686 i686 i386 gnulinux '
    config_args='-ds -e -Dprefix=/usr -Dvendorprefix=/usr -Dinstallusrbinperl -Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Duseshrplib=true -Doptimize=-O2 -march=i586 -mtune=i686 -fmessage-length=0 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -g -Wall -pipe'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBUGGING -fno-strict-aliasing -pipe -Wdeclaration-after-statement -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2 -march=i586 -mtune=i686 -fmessage-length=0 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -g -Wall -pipe',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBUGGING -fno-strict-aliasing -pipe -Wdeclaration-after-statement'
    ccversion='', gccversion='4.2.1 (SUSE Linux)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =''
    libpth=/lib /usr/lib /usr/local/lib
    libs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.6.1.so, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.6.1'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.8.8/i586-linux-thread-multi/CORE'
    cccdlflags='-fPIC', lddlflags='-shared'

Locally applied patches:
    

---
@INC for perl v5.8.8:
    /usr/lib/perl5/5.8.8/i586-linux-thread-multi
    /usr/lib/perl5/5.8.8
    /usr/lib/perl5/site_perl/5.8.8/i586-linux-thread-multi
    /usr/lib/perl5/site_perl/5.8.8
    /usr/lib/perl5/site_perl
    /usr/lib/perl5/vendor_perl/5.8.8/i586-linux-thread-multi
    /usr/lib/perl5/vendor_perl/5.8.8
    /usr/lib/perl5/vendor_perl
    .

---
Environment for perl v5.8.8:
    HOME=/home/markus
    LANG=en_GB.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/markus/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
    PERL_BADLANG (unset)
    SHELL=/bin/bash
Follow-Ups from:
"Rafael Garcia-Suarez" <rgarciasuarez@gmail.com>
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