93 lines
3.1 KiB
Diff
93 lines
3.1 KiB
Diff
From 2591fad87cefdf217fd77bf7bb9d485ced15fd8c Mon Sep 17 00:00:00 2001
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From: JunWei Song <sungboss2004@gmail.com>
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Date: Wed, 11 Sep 2019 23:04:12 +0800
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Subject: [PATCH] bpo-36260: Add pitfalls to zipfile module documentation
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(#13378)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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* bpo-36260: Add pitfalls to zipfile module documentation
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We saw vulnerability warning description (including zip bomb) in Doc/library/xml.rst file.
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This gave us the idea of documentation improvement.
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So, we moved a little bit forward :P
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And the doc patch can be found (pr).
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* fix trailing whitespace
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* 📜🤖 Added by blurb_it.
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* Reformat text for consistency.
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(cherry picked from commit 3ba51d587f6897a45301ce9126300c14fcd4eba2)
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Signed-off-by: Yufa Fang <fangyufa1@huawei.com>
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---
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Doc/library/zipfile.rst | 40 +++++++++++++++++++
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.../2019-06-04-09-29-00.bpo-36260.WrGuc-.rst | 1 +
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2 files changed, 41 insertions(+)
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create mode 100644 Misc/NEWS.d/next/Documentation/2019-06-04-09-29-00.bpo-36260.WrGuc-.rst
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diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst
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index ba613b3f8e..77a29fbccd 100644
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--- a/Doc/library/zipfile.rst
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+++ b/Doc/library/zipfile.rst
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@@ -553,5 +553,45 @@ Command-line options
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Test whether the zipfile is valid or not.
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+Decompression pitfalls
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+----------------------
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+
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+The extraction in zipfile module might fail due to some pitfalls listed below.
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+
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+From file itself
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+~~~~~~~~~~~~~~~~
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+
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+Decompression may fail due to incorrect password / CRC checksum / ZIP format or
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+unsupported compression method / decryption.
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+
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+File System limitations
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+~~~~~~~~~~~~~~~~~~~~~~~
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+
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+Exceeding limitations on different file systems can cause decompression failed.
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+Such as allowable characters in the directory entries, length of the file name,
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+length of the pathname, size of a single file, and number of files, etc.
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+
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+Resources limitations
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+~~~~~~~~~~~~~~~~~~~~~
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+
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+The lack of memory or disk volume would lead to decompression
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+failed. For example, decompression bombs (aka `ZIP bomb`_)
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+apply to zipfile library that can cause disk volume exhaustion.
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+
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+Interruption
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+~~~~~~~~~~~~
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+
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+Interruption during the decompression, such as pressing control-C or killing the
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+decompression process may result in incomplete decompression of the archive.
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+
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+Default behaviors of extraction
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+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+
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+Not knowing the default extraction behaviors
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+can cause unexpected decompression results.
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+For example, when extracting the same archive twice,
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+it overwrites files without asking.
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+
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+.. _ZIP bomb: https://en.wikipedia.org/wiki/Zip_bomb
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.. _PKZIP Application Note: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
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diff --git a/Misc/NEWS.d/next/Documentation/2019-06-04-09-29-00.bpo-36260.WrGuc-.rst b/Misc/NEWS.d/next/Documentation/2019-06-04-09-29-00.bpo-36260.WrGuc-.rst
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new file mode 100644
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index 0000000000..9276516a88
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Documentation/2019-06-04-09-29-00.bpo-36260.WrGuc-.rst
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@@ -0,0 +1 @@
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+Add decompression pitfalls to zipfile module documentation.
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\ No newline at end of file
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--
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2.19.1
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