/ 
perl-5.6.2
River stage five • 12010 direct dependents • 33600 total dependents
/ lib/ExtUtils/MakeMaker/Tutorial.pod
Security Advisories (26)
CVE-2011-2728 (2012-12-21)

The bsd_glob function in the File::Glob module for Perl before 5.14.2 allows context-dependent attackers to cause a denial of service (crash) via a glob expression with the GLOB_ALTDIRFUNC flag, which triggers an uninitialized pointer dereference.

CVE-2020-12723 (2020-06-05)

regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

CVE-2020-10878 (2020-06-05)

Perl before 5.30.3 has an integer overflow related to mishandling of a "PL_regkind[OP(n)] == NOTHING" situation. A crafted regular expression could lead to malformed bytecode with a possibility of instruction injection.

CVE-2020-10543 (2020-06-05)

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

CVE-2018-6913 (2018-04-17)

Heap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a large item count.

CVE-2018-18314 (2018-12-07)

Perl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVE-2018-18313 (2018-12-07)

Perl before 5.26.3 has a buffer over-read via a crafted regular expression that triggers disclosure of sensitive information from process memory.

CVE-2018-18312 (2018-12-05)

Perl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVE-2018-18311 (2018-12-07)

Perl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.

CVE-2015-8853 (2016-05-25)

The (1) S_reghop3, (2) S_reghop4, and (3) S_reghopmaybe3 functions in regexec.c in Perl before 5.24.0 allow context-dependent attackers to cause a denial of service (infinite loop) via crafted utf-8 data, as demonstrated by "a\x80."

CVE-2013-1667 (2013-03-14)

The rehash mechanism in Perl 5.8.2 through 5.16.x allows context-dependent attackers to cause a denial of service (memory consumption and crash) via a crafted hash key.

CVE-2010-4777 (2014-02-10)

The Perl_reg_numbered_buff_fetch function in Perl 5.10.0, 5.12.0, 5.14.0, and other versions, when running with debugging enabled, allows context-dependent attackers to cause a denial of service (assertion failure and application exit) via crafted input that is not properly handled when using certain regular expressions, as demonstrated by causing SpamAssassin and OCSInventory to crash.

CVE-2010-1158 (2010-04-20)

Integer overflow in the regular expression engine in Perl 5.8.x allows context-dependent attackers to cause a denial of service (stack consumption and application crash) by matching a crafted regular expression against a long string.

CVE-2009-3626 (2009-10-29)

Perl 5.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a UTF-8 character with a large, invalid codepoint, which is not properly handled during a regular-expression match.

CVE-2008-1927 (2008-04-24)

Double free vulnerability in Perl 5.8.8 allows context-dependent attackers to cause a denial of service (memory corruption and crash) via a crafted regular expression containing UTF8 characters. NOTE: this issue might only be present on certain operating systems.

CVE-2005-3962 (2005-12-01)

Integer overflow in the format string functionality (Perl_sv_vcatpvfn) in Perl 5.9.2 and 5.8.6 Perl allows attackers to overwrite arbitrary memory and possibly execute arbitrary code via format string specifiers with large values, which causes an integer wrap and leads to a buffer overflow, as demonstrated using format string vulnerabilities in Perl applications.

CVE-2007-5116 (2007-11-07)

Buffer overflow in the polymorphic opcode support in the Regular Expression Engine (regcomp.c) in Perl 5.8 allows context-dependent attackers to execute arbitrary code by switching from byte to Unicode (UTF) characters in a regular expression.

CVE-2012-5195 (2012-12-18)

Heap-based buffer overflow in the Perl_repeatcpy function in util.c in Perl 5.12.x before 5.12.5, 5.14.x before 5.14.3, and 5.15.x before 15.15.5 allows context-dependent attackers to cause a denial of service (memory consumption and crash) or possibly execute arbitrary code via the 'x' string repeat operator.

CVE-2016-2381 (2016-04-08)

Perl might allow context-dependent attackers to bypass the taint protection mechanism in a child process via duplicate environment variables in envp.

CVE-2013-7422 (2015-08-16)

Integer underflow in regcomp.c in Perl before 5.20, as used in Apple OS X before 10.10.5 and other products, allows context-dependent attackers to execute arbitrary code or cause a denial of service (application crash) via a long digit string associated with an invalid backreference within a regular expression.

CVE-2011-1487 (2011-04-11)

The (1) lc, (2) lcfirst, (3) uc, and (4) ucfirst functions in Perl 5.10.x, 5.11.x, and 5.12.x through 5.12.3, and 5.13.x through 5.13.11, do not apply the taint attribute to the return value upon processing tainted input, which might allow context-dependent attackers to bypass the taint protection mechanism via a crafted string.

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

CVE-2024-56406 (2025-04-13)

A heap buffer overflow vulnerability was discovered in Perl. When there are non-ASCII bytes in the left-hand-side of the `tr` operator, `S_do_trans_invmap` can overflow the destination pointer `d`.    $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;'    Segmentation fault (core dumped) It is believed that this vulnerability can enable Denial of Service and possibly Code Execution attacks on platforms that lack sufficient defenses.

CVE-2016-1238 (2016-08-02)

(1) cpan/Archive-Tar/bin/ptar, (2) cpan/Archive-Tar/bin/ptardiff, (3) cpan/Archive-Tar/bin/ptargrep, (4) cpan/CPAN/scripts/cpan, (5) cpan/Digest-SHA/shasum, (6) cpan/Encode/bin/enc2xs, (7) cpan/Encode/bin/encguess, (8) cpan/Encode/bin/piconv, (9) cpan/Encode/bin/ucmlint, (10) cpan/Encode/bin/unidump, (11) cpan/ExtUtils-MakeMaker/bin/instmodsh, (12) cpan/IO-Compress/bin/zipdetails, (13) cpan/JSON-PP/bin/json_pp, (14) cpan/Test-Harness/bin/prove, (15) dist/ExtUtils-ParseXS/lib/ExtUtils/xsubpp, (16) dist/Module-CoreList/corelist, (17) ext/Pod-Html/bin/pod2html, (18) utils/c2ph.PL, (19) utils/h2ph.PL, (20) utils/h2xs.PL, (21) utils/libnetcfg.PL, (22) utils/perlbug.PL, (23) utils/perldoc.PL, (24) utils/perlivp.PL, and (25) utils/splain.PL in Perl 5.x before 5.22.3-RC2 and 5.24 before 5.24.1-RC2 do not properly remove . (period) characters from the end of the includes directory array, which might allow local users to gain privileges via a Trojan horse module under the current working directory.

CVE-2015-8608 (2017-02-07)

The VDir::MapPathA and VDir::MapPathW functions in Perl 5.22 allow remote attackers to cause a denial of service (out-of-bounds read) and possibly execute arbitrary code via a crafted (1) drive letter or (2) pInName argument.

NAME

ExtUtils::MakeMaker::Tutorial - Writing a module with MakeMaker

SYNOPSIS

use ExtUtils::MakeMaker;

WriteMakefile(
    NAME            => 'Your::Module',
    VERSION_FROM    => 'lib/Your/Module.pm'
);

DESCRIPTION

This is a short tutorial on writing a simple module with MakeMaker. Its really not that hard.

The Mantra

MakeMaker modules are installed using this simple mantra

perl Makefile.PL
make
make test
make install

There are lots more commands and options, but the above will do it.

The Layout

The basic files in a module look something like this.

Makefile.PL
MANIFEST
lib/Your/Module.pm

That's all that's strictly necessary. There's additional files you might want:

lib/Your/Other/Module.pm
t/some_test.t
t/some_other_test.t
Changes
README
INSTALL
MANIFEST.SKIP
bin/some_program
Makefile.PL

When you run Makefile.PL, it makes a Makefile. That's the whole point of MakeMaker. The Makefile.PL is a simple module which loads ExtUtils::MakeMaker and runs the WriteMakefile() function with a few simple arguments.

Here's an example of what you need for a simple module:

use ExtUtils::MakeMaker;

WriteMakefile(
    NAME            => 'Your::Module',
    VERSION_FROM    => 'lib/Your/Module.pm'
);

NAME is the top-level namespace of your module. VERSION_FROM is the file which contains the $VERSION variable for the entire distribution. Typically this is the same as your top-level module.

MANIFEST

A simple listing of all the files in your distribution.

Makefile.PL
MANIFEST
lib/Your/Module.pm

File paths in a MANIFEST always use Unix conventions (ie. /) even if you're not on Unix.

You can write this by hand or generate it with 'make manifest'.

lib/

This is the directory where your .pm and .pod files you wish to have installed go. They are layed out according to namespace. So Foo::Bar is lib/Foo/Bar.pm.

t/

Tests for your modules go here. Each test filename ends with a .t. So t/foo.t. 'make test' will run these tests. The directory is flat, you cannot, for example, have t/foo/bar.t run by 'make test'.

Tests are run from the top level of your distribution. So inside a test you would refer to ./lib to enter the lib directory, for example.

Changes

A log of changes you've made to this module. The layout is free-form. Here's an example:

1.01 Fri Apr 11 00:21:25 PDT 2003
    - thing() does some stuff now
    - fixed the wiggy bug in withit()

1.00 Mon Apr  7 00:57:15 PDT 2003
    - "Rain of Frogs" now supported
README

A short description of your module, what it does, why someone would use it and its limitations. CPAN automatically pulls your README file out of the archive and makes it available to CPAN users, it is the first thing they will read to decide if your module is right for them.

INSTALL

Instructions on how to install your module along with any dependencies. Suggested information to include here:

any extra modules required for use
the minimum version of Perl required
if only works on certain operating systems
MANIFEST.SKIP

A file full of regular expressions to exclude when using 'make manifest' to generate the MANIFEST. These regular expressions are checked against each file path found in the distribution (so you're matching against "t/foo.t" not "foo.t").

Here's a sample:

~$          # ignore emacs and vim backup files
.bak$       # ignore manual backups
\#          # ignore CVS old revision files and emacs temp files

Since # can be used for comments, # must be escaped.

MakeMaker comes with a default MANIFEST.SKIP to avoid things like version control directories and backup files. Specifying your own will override this default.

bin/

SEE ALSO

perlmodstyle gives stylistic help writing a module.

perlnewmod gives more information about how to write a module.

There are modules to help you through the process of writing a module: ExtUtils::ModuleMaker, Module::Install, PAR