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List: kde-frameworks-devel
Subject: D24489: KAutosaveFile not respecting maximum filename length
From: Jean-Baptiste Mardelle <noreply () phabricator ! kde ! org>
Date: 2019-10-08 11:16:29
Message-ID: 46c1e021ebbe984a60a46ea140ef8d94 () localhost ! localdomain
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mardelle created this revision.
mardelle added a reviewer: Frameworks.
mardelle added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
mardelle requested review of this revision.
REVISION SUMMARY
There are 2 different issues in current code regarding maximum filename \
length:
1- We use FILENAME_MAX which is defined as 4096, while most filesystems \
have a max length of 256. Replacing FILENAME_MAX with NAME_MAX fixes this \
first problem (could not test on Windows if it works)
2- We are calculating the maximum length on the UTF-8 string, then \
encoding to percent encoding. This can result in longer strings since \
single characters will be replaced by a percent string. So in some \
situations, we end up with a string longer than allowed. Doing the percent \
encoding before length calculation fixes the problem.
This fixes the follwing bug: https://bugs.kde.org/show_bug.cgi?id=412519
TEST PLAN
Bug is fixed with the changes
REPOSITORY
R244 KCoreAddons
REVISION DETAIL
https://phabricator.kde.org/D24489
AFFECTED FILES
src/lib/io/kautosavefile.cpp
To: mardelle, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
[Attachment #3 (text/html)]
<table><tr><td style="">mardelle created this revision.<br />mardelle added \
a reviewer: Frameworks.<br />mardelle added a project: Frameworks.<br \
/>Herald added a subscriber: kde-frameworks-devel.<br />mardelle requested \
review of this revision. </td><a style="text-decoration: none; padding: 4px \
8px; margin: 0 8px 8px; float: right; color: #464C5C; font-weight: bold; \
border-radius: 3px; background-color: #F7F7F9; background-image: \
linear-gradient(to bottom,#fff,#f1f0f1); display: inline-block; border: 1px \
solid rgba(71,87,120,.2);" href="https://phabricator.kde.org/D24489">View \
Revision</a></tr></table><br /><div><strong>REVISION \
SUMMARY</strong><div><p>There are 2 different issues in current code \
regarding maximum filename length:</p>
<p>1- We use FILENAME_MAX which is defined as 4096, while most filesystems \
have a max length of 256. Replacing FILENAME_MAX with NAME_MAX fixes this \
first problem (could not test on Windows if it works)</p>
<p>2- We are calculating the maximum length on the UTF-8 string, then \
encoding to percent encoding. This can result in longer strings since \
single characters will be replaced by a percent string. So in some \
situations, we end up with a string longer than allowed. Doing the percent \
encoding before length calculation fixes the problem.</p>
<p>This fixes the follwing bug: <a \
href="https://bugs.kde.org/show_bug.cgi?id=412519" class="remarkup-link" \
target="_blank" rel="noreferrer">https://bugs.kde.org/show_bug.cgi?id=412519</a></p></div></div><br \
/><div><strong>TEST PLAN</strong><div><p>Bug is fixed with the \
changes</p></div></div><br /><div><strong>REPOSITORY</strong><div><div>R244 \
KCoreAddons</div></div></div><br /><div><strong>REVISION \
DETAIL</strong><div><a \
href="https://phabricator.kde.org/D24489">https://phabricator.kde.org/D24489</a></div></div><br \
/><div><strong>AFFECTED \
FILES</strong><div><div>src/lib/io/kautosavefile.cpp</div></div></div><br \
/><div><strong>To: </strong>mardelle, Frameworks<br /><strong>Cc: \
</strong>kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns<br \
/></div>
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