[RFC PATCH] generic/45[34]: add colored emoji variants to unicode tests

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Ted told me this morning about a recent problem with kernel Unicode name
casefolding vs. emoji -- initially, someone decided that zero-width
joiners should be stripped out of filenames during comparisons, which
lead to malicious git pulls of branches containing "<zwj>.git/config"
files overwriting git repo config files.  A quick fix was to stop
ignoring the "ignorable" code points, but that broke emoji in filenames,
because emoji use zero-width joiners to combine simpler emoji into more
complex ones, or alter skin tones, or colors, etc.  Reportedly the
casefolding code will also fold a red heart into a black one.

So.  To our filename support test, let's add various colors of heart
emoji and various skin tones of heart-hands; and compound emoji
consisting of multiple emoji glued together with zero width joiners.
This actually caused a buffer overflow in the string-escaping functions
of xfs_scrub phase 5 because I hadn't anticipated that we'd end up with
a filename consisting *entirely* of nonprinting bytes.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
 tests/generic/453 |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/generic/454 |   55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)

diff --git a/tests/generic/453 b/tests/generic/453
index 04945ad1085b2d..bd5ce8b2bb11d9 100755
--- a/tests/generic/453
+++ b/tests/generic/453
@@ -203,6 +203,36 @@ setf "job offer.pdf" "actual period"
 setf "llamapirate\xf3\xa0\x80\x81\xf3\xa0\x81\x94\xf3\xa0\x81\xa8\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb3\xf3\xa0\x81\xa1\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x81\xb3\xf3\xa0\x80\xa0\xf3\xa0\x81\xa6\xf3\xa0\x81\xaf\xf3\xa0\x81\xb2\xf3\xa0\x80\xa0\xf3\xa0\x81\x93\xf3\xa0\x81\xa5\xf3\xa0\x81\xa1\xf3\xa0\x81\xb4\xf3\xa0\x81\xb4\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb7\xf3\xa0\x81\xa5\xf3\xa0\x81\xb2\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\x95\xf3\xa0\x81\x93\xf3\xa0\x81\x84\xf3\xa0\x80\xa0\xf3\xa0\x80\xb1\xf3\xa0\x80\xb2\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x81\xbf"
 setf "llamapirate"
 
+# colored heart emoji to check if casefolding whacks emoji
+setf "\xf0\x9f\x92\x9c" "purple"
+setf "\xf0\x9f\x92\x99" "blue"
+setf "\xf0\x9f\x92\x9a" "green"
+setf "\xf0\x9f\x92\x9b" "yellow"
+setf "\xf0\x9f\xab\x80" "heart"
+setf "\xe2\x9d\xa4\xef\xb8\x8f" "red"
+setf "\xf0\x9f\xa4\x8e" "brown"
+setf "\xf0\x9f\xa4\x8d" "white"
+setf "\xf0\x9f\x96\xa4" "black"
+setf "\xf0\x9f\xa7\xa1" "orange"
+setf "\xe2\x99\xa5\xef\xb8\x8f" "red suit"
+
+# zero width joiners exist in the middle of emoji sequences aren't supposed
+# to be normalized to nothing, but apparently this caused issues with
+# casefolding on ext4; also the mending heart caused a crash in xfs_scrub
+setf "\xf0\x9f\x92\x94" "broken heart"
+setf "\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa9\xb9" "mending heart"
+setf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8
+\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbc" "couple with heart"
+setf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbf" "couple with heart, light and dark skin tone"
+
+# emoji heart hands with skin tone variations
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbf" "dark"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbe" "medium dark"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbd" "medium"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbc" "medium light"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbb" "light"
+setf "\xf0\x9f\xab\xb6" "neutral"
+
 ls -laR $testdir >> $seqres.full
 
 echo "Test files"
@@ -276,6 +306,31 @@ testf "job offer.pdf" "actual period"
 testf "llamapirate\xf3\xa0\x80\x81\xf3\xa0\x81\x94\xf3\xa0\x81\xa8\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb3\xf3\xa0\x81\xa1\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x81\xb3\xf3\xa0\x80\xa0\xf3\xa0\x81\xa6\xf3\xa0\x81\xaf\xf3\xa0\x81\xb2\xf3\xa0\x80\xa0\xf3\xa0\x81\x93\xf3\xa0\x81\xa5\xf3\xa0\x81\xa1\xf3\xa0\x81\xb4\xf3\xa0\x81\xb4\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb7\xf3\xa0\x81\xa5\xf3\xa0\x81\xb2\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\x95\xf3\xa0\x81\x93\xf3\xa0\x81\x84\xf3\xa0\x80\xa0\xf3\xa0\x80\xb1\xf3\xa0\x80\xb2\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x81\xbf"
 testf "llamapirate"
 
+testf "\xf0\x9f\x92\x9c" "purple"
+testf "\xf0\x9f\x92\x99" "blue"
+testf "\xf0\x9f\x92\x9a" "green"
+testf "\xf0\x9f\x92\x9b" "yellow"
+testf "\xf0\x9f\xab\x80" "heart"
+testf "\xe2\x9d\xa4\xef\xb8\x8f" "red"
+testf "\xf0\x9f\xa4\x8e" "brown"
+testf "\xf0\x9f\xa4\x8d" "white"
+testf "\xf0\x9f\x96\xa4" "black"
+testf "\xf0\x9f\xa7\xa1" "orange"
+testf "\xe2\x99\xa5\xef\xb8\x8f" "red suit"
+
+testf "\xf0\x9f\x92\x94" "broken heart"
+testf "\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa9\xb9" "mending heart"
+testf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8
+\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbc" "couple with heart"
+testf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbf" "couple with heart, light and dark skin tone"
+
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbf" "dark"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbe" "medium dark"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbd" "medium"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbc" "medium light"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbb" "light"
+testf "\xf0\x9f\xab\xb6" "neutral"
+
 echo "Uniqueness of inodes?"
 stat -c '%i' "${testdir}/"* | sort | uniq -c | while read nr inum; do
 	if [ "${nr}" -gt 1 ]; then
diff --git a/tests/generic/454 b/tests/generic/454
index aec8beb8b43ca0..9f6ddb4a0e48b2 100755
--- a/tests/generic/454
+++ b/tests/generic/454
@@ -124,6 +124,36 @@ setf "combmark_\xe1\x80\x9c\xe1\x80\xaf\xe1\x80\xad.txt" "combining marks"
 setf "llamapirate\xf3\xa0\x80\x81\xf3\xa0\x81\x94\xf3\xa0\x81\xa8\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb3\xf3\xa0\x81\xa1\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x81\xb3\xf3\xa0\x80\xa0\xf3\xa0\x81\xa6\xf3\xa0\x81\xaf\xf3\xa0\x81\xb2\xf3\xa0\x80\xa0\xf3\xa0\x81\x93\xf3\xa0\x81\xa5\xf3\xa0\x81\xa1\xf3\xa0\x81\xb4\xf3\xa0\x81\xb4\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb7\xf3\xa0\x81\xa5\xf3\xa0\x81\xb2\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\x95\xf3\xa0\x81\x93\xf3\xa0\x81\x84\xf3\xa0\x80\xa0\xf3\xa0\x80\xb1\xf3\xa0\x80\xb2\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x81\xbf" "secret instructions"
 setf "llamapirate" "no secret instructions"
 
+# colored heart emoji to check if casefolding whacks emoji
+setf "\xf0\x9f\x92\x9c" "purple"
+setf "\xf0\x9f\x92\x99" "blue"
+setf "\xf0\x9f\x92\x9a" "green"
+setf "\xf0\x9f\x92\x9b" "yellow"
+setf "\xf0\x9f\xab\x80" "heart"
+setf "\xe2\x9d\xa4\xef\xb8\x8f" "red"
+setf "\xf0\x9f\xa4\x8e" "brown"
+setf "\xf0\x9f\xa4\x8d" "white"
+setf "\xf0\x9f\x96\xa4" "black"
+setf "\xf0\x9f\xa7\xa1" "orange"
+setf "\xe2\x99\xa5\xef\xb8\x8f" "red suit"
+
+# zero width joiners exist in the middle of emoji sequences aren't supposed
+# to be normalized to nothing, but apparently this caused issues with
+# casefolding on ext4; also the mending heart caused a crash in xfs_scrub
+setf "\xf0\x9f\x92\x94" "broken heart"
+setf "\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa9\xb9" "mending heart"
+setf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8
+\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbc" "couple with heart"
+setf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbf" "couple with heart, light and dark skin tone"
+
+# emoji heart hands with skin tone variations
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbf" "dark"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbe" "medium dark"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbd" "medium"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbc" "medium light"
+setf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbb" "light"
+setf "\xf0\x9f\xab\xb6" "neutral"
+
 _getfattr --absolute-names -d "${testfile}" >> $seqres.full
 
 echo "Test files"
@@ -174,6 +204,31 @@ testf "combmark_\xe1\x80\x9c\xe1\x80\xaf\xe1\x80\xad.txt" "combining marks"
 testf "llamapirate\xf3\xa0\x80\x81\xf3\xa0\x81\x94\xf3\xa0\x81\xa8\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb3\xf3\xa0\x81\xa1\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x81\xb3\xf3\xa0\x80\xa0\xf3\xa0\x81\xa6\xf3\xa0\x81\xaf\xf3\xa0\x81\xb2\xf3\xa0\x80\xa0\xf3\xa0\x81\x93\xf3\xa0\x81\xa5\xf3\xa0\x81\xa1\xf3\xa0\x81\xb4\xf3\xa0\x81\xb4\xf3\xa0\x81\xac\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\xb7\xf3\xa0\x81\xa5\xf3\xa0\x81\xb2\xf3\xa0\x81\xa5\xf3\xa0\x80\xa0\xf3\xa0\x81\x95\xf3\xa0\x81\x93\xf3\xa0\x81\x84\xf3\xa0\x80\xa0\xf3\xa0\x80\xb1\xf3\xa0\x80\xb2\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x80\xb0\xf3\xa0\x81\xbf" "secret instructions"
 testf "llamapirate" "no secret instructions"
 
+testf "\xf0\x9f\x92\x9c" "purple"
+testf "\xf0\x9f\x92\x99" "blue"
+testf "\xf0\x9f\x92\x9a" "green"
+testf "\xf0\x9f\x92\x9b" "yellow"
+testf "\xf0\x9f\xab\x80" "heart"
+testf "\xe2\x9d\xa4\xef\xb8\x8f" "red"
+testf "\xf0\x9f\xa4\x8e" "brown"
+testf "\xf0\x9f\xa4\x8d" "white"
+testf "\xf0\x9f\x96\xa4" "black"
+testf "\xf0\x9f\xa7\xa1" "orange"
+testf "\xe2\x99\xa5\xef\xb8\x8f" "red suit"
+
+testf "\xf0\x9f\x92\x94" "broken heart"
+testf "\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa9\xb9" "mending heart"
+testf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8
+\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbc" "couple with heart"
+testf "\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbb\xe2\x80\x8d\xe2\x9d\xa4\xef\xb8\x8f\xe2\x80\x8d\xf0\x9f\xa7\x91\xf0\x9f\x8f\xbf" "couple with heart, light and dark skin tone"
+
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbf" "dark"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbe" "medium dark"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbd" "medium"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbc" "medium light"
+testf "\xf0\x9f\xab\xb6\xf0\x9f\x8f\xbb" "light"
+testf "\xf0\x9f\xab\xb6" "neutral"
+
 echo "Uniqueness of keys?"
 crazy_keys="$(_getfattr --absolute-names -d "${testfile}" | grep -E -c '(french_|chinese_|greek_|arabic_|urk)')"
 expected_keys=11