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Report information
Id: 74142
Status: pending release
Priority: 0/
Queue: perl5

Owner: tonyc <tony [at]>
Requestors: jquelin [at]

Operating System: Linux
PatchStatus: (no value)
Severity: low
Perl Version: 5.12.0
Fixed In: (no value)

Subject: provide a better c wrapper example in perlsec
Date: Thu, 8 Apr 2010 17:06:07 +0200 (CEST)
To: perlbug [...]
From: jquelin [...] (Jerome Quelin)
This is a bug report for perl from, generated with the help of perlbug 1.39 running under perl 5.12.0. ----------------------------------------------------------------- [Please describe your issue here] perl 5.12 doesn't ship perlsuid anymore. it's said so in perlsec, with a small piece of a c code to use as a wrapper calling the real perl script, the goal being to setuid the wrapper instead. however, the wrapper could be better, such as sanitizing env, or whatever any security-aware people will recommend. ==> in order to have a smooth transition, it would be good to provide a more secure wrapper to be used easily. [Please do not change anything below this line] ----------------------------------------------------------------- --- Flags: category=docs severity=low --- Site configuration information for perl 5.12.0: Configured by Mandriva at Thu Apr 8 16:20:55 CEST 2010. Summary of my perl5 (revision 5 version 12 subversion 0) configuration: Platform: osname=linux, osvers=, archname=x86_64-linux-thread-multi uname='linux localhost #1 smp tue mar 16 18:22:58 utc 2010 x86_64 x86_64 x86_64 gnulinux ' config_args='-des -Dinc_version_list=5.10.1 5.10.0 5.8.8 5.8.7 5.8.6 5.8.5 5.8.4 5.8.3 5.8.2 5.8.1 5.8.0 5.6.1 5.6.0 -Darchname=x86_64-linux -Dcc=x86_64-mandriva-linux-gnu-gcc -Doptimize=-O2 -g -pipe -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector --param=ssp-buffer-size=4 -DDEBUGGING=-g -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr -Dsitebin=/usr/local/bin -Dsiteman1dir=/usr/local/share/man/man1 -Dsiteman3dir=/usr/local/share/man/man3 -Dman3ext=3pm -Dcf_by=Mandriva -Dmyhostname=localhost -Dperladmin=root@localhost -Dcf_email=root@localhost -Ud_csh -Duseshrplib -Duseithreads -Di_db -Di_ndbm -Di_gdbm' hint=recommended, useposix=true, d_sigaction=define useithreads=define, usemultiplicity=define useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='x86_64-mandriva-linux-gnu-gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2 -g -pipe -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector --param=ssp-buffer-size=4', cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='', gccversion='4.4.3', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='x86_64-mandriva-linux-gnu-gcc', ldflags =' -fstack-protector -L/usr/local/lib64' libpth=/usr/local/lib64 /lib64 /usr/lib64 libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc libc=/lib/, so=so, useshrplib=true, gnulibc_version='2.11.1' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.12.0/x86_64-linux-thread-multi/CORE' cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector --param=ssp-buffer-size=4 -L/usr/local/lib64' Locally applied patches: RC4 Mandriva Linux patches --- @INC for perl 5.12.0: /home/jquelin/rpm/cooker/perl/BUILD/perl-5.12.0-RC4/lib /usr/lib/perl5/site_perl/5.12.0/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.12.0 /usr/lib/perl5/vendor_perl/5.12.0/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.12.0 /usr/lib/perl5/5.12.0/x86_64-linux-thread-multi /usr/lib/perl5/5.12.0 /usr/lib/perl5/site_perl/5.10.1 /usr/lib/perl5/site_perl/5.10.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.10.1 /usr/lib/perl5/vendor_perl/5.10.0 /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl . --- Environment for perl 5.12.0: HOME=/home/jquelin LANG=fr_FR.UTF-8 LANGUAGE=fr_FR.UTF-8:fr LC_ADDRESS=fr_FR.UTF-8 LC_COLLATE=fr_FR.UTF-8 LC_CTYPE=fr_FR.UTF-8 LC_IDENTIFICATION=fr_FR.UTF-8 LC_MEASUREMENT=fr_FR.UTF-8 LC_MESSAGES=fr_FR.UTF-8 LC_MONETARY=fr_FR.UTF-8 LC_NAME=fr_FR.UTF-8 LC_NUMERIC=fr_FR.UTF-8 LC_PAPER=fr_FR.UTF-8 LC_SOURCED=1 LC_TELEPHONE=fr_FR.UTF-8 LC_TIME=fr_FR.UTF-8 LD_LIBRARY_PATH=. LOGDIR (unset) PATH=.:/home/jquelin/bin:/home/jquelin/bin:/home/jquelin/bin:/home/jquelin/bin:/usr/bin:/bin:/usr/local/bin:/usr/X11R6/bin/:/usr/games:/usr/lib/qt4/bin:/sbin:/usr/sbin:/usr/games:/sbin:/usr/sbin:/usr/games:/sbin:/usr/sbin:/usr/games:/sbin:/usr/sbin:/usr/games PERL5LIB=/home/jquelin/rpm/cooker/perl/BUILD/perl-5.12.0-RC4/lib PERL_BADLANG (unset) SHELL=/bin/bash
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Hmm, that wrapper example has been there since about 1996, and still uses K&R arg conventions! Definitely a good idea to improve it now, though.
Subject: Re: [perl #74142] provide a better c wrapper example in perlsec
Date: Fri, 9 Apr 2010 12:24:35 +0100
To: perl5-porters [...]
From: Zefram <zefram [...]>
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Jerome Quelin wrote: Show quoted text
>however, the wrapper could be better,
I think we should be promoting the use of sudo, before suggesting a custom wrapper. -zefram
CC: perl5-porters [...]
Subject: Re: [perl #74142] provide a better c wrapper example in perlsec
Date: Fri, 9 Apr 2010 10:11:30 -0400
To: Zefram <zefram [...]>
From: Jesse Vincent <jesse [...]>
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On Fri, Apr 09, 2010 at 12:24:35PM +0100, Zefram wrote: Show quoted text
> Jerome Quelin wrote:
> >however, the wrapper could be better,
> > I think we should be promoting the use of sudo, before suggesting a > custom wrapper.
+1 Show quoted text
> > -zefram
To: perl5-porters [...]
Date: Mon, 11 Dec 2017 00:34:05 +0000
From: Zefram <zefram [...]>
Subject: Re: [perl #74142] provide a better c wrapper example in perlsec
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The C wrapper code is actually fine as it is: its purpose is to avoid the shebang race condition, not to sanitise other aspects of the environment. Much of perlsec is about how Perl is actually OK to run set-id. However, the documentation about the race condition and the wrapper was poor. I've revised it, and added a section about sudo, in commit b5145c7d479fcfcb104fc6d3d89b4d757ca3cd15. -zefram

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