Changeset 33360

Timestamp:

07/22/2015 05:43:35 AM (10 years ago)

Author:

pento

Message:

Shortcodes: Improve the reliablity of shortcodes inside HTML tags.

Merge of [33359] to the 4.2 branch.

Props miqrogroove.

See #15694.

Location:

branches/4.2

Files:

• src/wp-admin/css/press-this.css (modified) (1 diff)
• src/wp-includes/class-wp-embed.php (modified) (2 diffs)
• src/wp-includes/formatting.php (modified) (2 diffs)
• src/wp-includes/kses.php (modified) (4 diffs)
• src/wp-includes/shortcodes.php (modified) (4 diffs)
• tests/phpunit/tests/kses.php (modified) (1 diff)
• tests/phpunit/tests/shortcode.php (modified) (1 diff)

branches/4.2/src/wp-admin/css/press-this.css

@@ -847 +847 @@
     font-size: 14px;
     -webkit-appearance: none;
+    -moz-appearance: none;
     appearance: none;
 }

branches/4.2/src/wp-includes/class-wp-embed.php

@@ -58 +58 @@
 
         // Do the shortcode (only the [embed] one is registered)
-        $content = do_shortcode( $content );
+        $content = do_shortcode( $content, true );
 
         // Put the original shortcodes back
@@ -313 +313 @@
      */
     public function autoembed( $content ) {
+        // Strip newlines from all elements.
+        $content = wp_replace_in_html_tags( $content, array( "\n" => " " ) );
+
+        // Find URLs that are on their own line.
         return preg_replace_callback( '|^(\s*)(https?://[^\s"]+)(\s*)$|im', array( $this, 'autoembed_callback' ), $content );
     }

branches/4.2/src/wp-includes/formatting.php

@@ -422 +422 @@
     $pee = str_replace(array("\r\n", "\r"), "\n", $pee); 
 
+    // Strip newlines from all elements.
+    $pee = wp_replace_in_html_tags( $pee, array( "\n" => " " ) );
+
     // Collapse line breaks before and after <option> elements so they don't get autop'd.
     if ( strpos( $pee, '<option' ) !== false ) {
@@ -508 +511 @@
 
     return $pee;
+}
+
+/**
+ * Replace characters or phrases within HTML elements only.
+ *
+ * @since 4.2.3
+ *
+ * @param string $haystack The text which has to be formatted.
+ * @param array $replace_pairs In the form array('from' => 'to', ...).
+ * @return string The formatted text.
+ */
+function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
+    // Find all elements.
+    $comments =
+          '!'           // Start of comment, after the <.
+        . '(?:'         // Unroll the loop: Consume everything until --> is found.
+        .     '-(?!->)' // Dash not followed by end of comment.
+        .     '[^\-]*+' // Consume non-dashes.
+        . ')*+'         // Loop possessively.
+        . '(?:-->)?';   // End of comment. If not found, match all input.
+
+    $regex =
+          '/('              // Capture the entire match.
+        .     '<'           // Find start of element.
+        .     '(?(?=!--)'   // Is this a comment?
+        .         $comments // Find end of comment.
+        .     '|'
+        .         '[^>]*>?' // Find end of element. If not found, match all input.
+        .     ')'
+        . ')/s';
+
+    $textarr = preg_split( $regex, $haystack, -1, PREG_SPLIT_DELIM_CAPTURE );
+    $changed = false;
+
+    // Optimize when searching for one item.
+    if ( 1 === count( $replace_pairs ) ) {
+        // Extract $needle and $replace.
+        foreach ( $replace_pairs as $needle => $replace );
+
+        // Loop through delimeters (elements) only.
+        for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) { 
+            if ( false !== strpos( $textarr[$i], $needle ) ) {
+                $textarr[$i] = str_replace( $needle, $replace, $textarr[$i] );
+                $changed = true;
+            }
+        }
+    } else {
+        // Extract all $needles.
+        $needles = array_keys( $replace_pairs );
+
+        // Loop through delimeters (elements) only.
+        for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) { 
+            foreach ( $needles as $needle ) {
+                if ( false !== strpos( $textarr[$i], $needle ) ) {
+                    $textarr[$i] = strtr( $textarr[$i], $replace_pairs );
+                    $changed = true;
+                    // After one strtr() break out of the foreach loop and look at next element.
+                    break;
+                }
+            }
+        }
+    }
+
+    if ( $changed ) {
+        $haystack = implode( $textarr );
+    }
+
+    return $haystack;
 }
 

branches/4.2/src/wp-includes/kses.php

@@ -530 +530 @@
 
 /**
+ * Filters one attribute only and ensures its value is allowed.
+ *
+ * This function has the advantage of being more secure than esc_attr() and can
+ * escape data in some situations where wp_kses() must strip the whole attribute.
+ *
+ * @since 4.2.3
+ *
+ * @param string $string The 'whole' attribute, including name and value.
+ * @param string $element The element name to which the attribute belongs.
+ * @return string Filtered attribute.
+ */
+function wp_kses_one_attr( $string, $element ) {
+    $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
+    $allowed_html = wp_kses_allowed_html( 'post' );
+    $allowed_protocols = wp_allowed_protocols();
+    $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
+    $string = wp_kses_js_entities( $string );
+    $string = wp_kses_normalize_entities( $string );
+
+    // Preserve leading and trailing whitespace.
+    $matches = array();
+    preg_match('/^\s*/', $string, $matches);
+    $lead = $matches[0];
+    preg_match('/\s*$/', $string, $matches);
+    $trail = $matches[0];
+    if ( empty( $trail ) ) {
+        $string = substr( $string, strlen( $lead ) );
+    } else {
+        $string = substr( $string, strlen( $lead ), -strlen( $trail ) );
+    }
+    
+    // Parse attribute name and value from input.
+    $split = preg_split( '/\s*=\s*/', $string, 2 );
+    $name = $split[0];
+    if ( count( $split ) == 2 ) {
+        $value = $split[1];
+
+        // Remove quotes surrounding $value.
+        // Also guarantee correct quoting in $string for this one attribute.
+        if ( '' == $value ) {
+            $quote = '';
+        } else {
+            $quote = $value[0];
+        }
+        if ( '"' == $quote || "'" == $quote ) {
+            if ( substr( $value, -1 ) != $quote ) {
+                return '';
+            }
+            $value = substr( $value, 1, -1 );
+        } else {
+            $quote = '"';
+        }
+
+        // Sanitize quotes and angle braces.
+        $value = htmlspecialchars( $value, ENT_QUOTES, null, false );
+
+        // Sanitize URI values.
+        if ( in_array( strtolower( $name ), $uris ) ) {
+            $value = wp_kses_bad_protocol( $value, $allowed_protocols );
+        }
+
+        $string = "$name=$quote$value$quote";
+        $vless = 'n';
+    } else {
+        $value = '';
+        $vless = 'y';
+    }
+    
+    // Sanitize attribute by name.
+    wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );
+
+    // Restore whitespace.
+    return $lead . $string . $trail;
+}
+
+/**
  * Return a list of allowed tags and attributes for a given context.
  *
@@ -749 +825 @@
     // in $attr2
     $attr2 = '';
-
-    $allowed_attr = $allowed_html[strtolower($element)];
-    foreach ($attrarr as $arreach) {
-        if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )
-            continue; // the attribute is not allowed
-
-        $current = $allowed_attr[strtolower($arreach['name'])];
-        if ( $current == '' )
-            continue; // the attribute is not allowed
-
-        if ( strtolower( $arreach['name'] ) == 'style' ) {
-            $orig_value = $arreach['value'];
-            $value = safecss_filter_attr( $orig_value );
-
-            if ( empty( $value ) )
-                continue;
-
-            $arreach['value'] = $value;
-            $arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] );
+    foreach ( $attrarr as $arreach ) {
+        if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
+            $attr2 .= ' '.$arreach['whole'];
         }
-
-        if ( ! is_array($current) ) {
-            $attr2 .= ' '.$arreach['whole'];
-        // there are no checks
-
-        } else {
-            // there are some checks
-            $ok = true;
-            foreach ($current as $currkey => $currval) {
-                if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) {
-                    $ok = false;
-                    break;
-                }
-            }
-
-            if ( $ok )
-                $attr2 .= ' '.$arreach['whole']; // it passed them
-        } // if !is_array($current)
-    } // foreach
+    }
 
     // Remove any "<" or ">" characters
@@ -793 +835 @@
 
     return "<$element$attr2$xhtml_slash>";
+}
+
+/**
+ * Determine whether an attribute is allowed.
+ *
+ * @since 4.2.3
+ *
+ * @param string $name The attribute name. Returns empty string when not allowed.
+ * @param string $value The attribute value. Returns a filtered value.
+ * @param string $whole The name=value input. Returns filtered input.
+ * @param string $vless 'y' when attribute like "enabled", otherwise 'n'.
+ * @param string $element The name of the element to which this attribute belongs.
+ * @param array $allowed_html The full list of allowed elements and attributes.
+ * @return bool Is the attribute allowed?
+ */
+function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
+    $allowed_attr = $allowed_html[strtolower( $element )];
+
+    $name_low = strtolower( $name );
+    if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
+        $name = $value = $whole = '';
+        return false;
+    }
+
+    if ( 'style' == $name_low ) {
+        $new_value = safecss_filter_attr( $value );
+
+        if ( empty( $new_value ) ) {
+            $name = $value = $whole = '';
+            return false;
+        }
+
+        $whole = str_replace( $value, $new_value, $whole );
+        $value = $new_value;
+    }
+
+    if ( is_array( $allowed_attr[$name_low] ) ) {
+        // there are some checks
+        foreach ( $allowed_attr[$name_low] as $currkey => $currval ) {
+            if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
+                $name = $value = $whole = '';
+                return false;
+            }
+        }
+    }
+
+    return true;
 }
 
@@ -922 +1011 @@
 
     return $attrarr;
+}
+
+/**
+ * Finds all attributes of an HTML element.
+ *
+ * Does not modify input.  May return "evil" output.
+ *
+ * Based on wp_kses_split2() and wp_kses_attr()
+ *
+ * @since 4.2.3
+ *
+ * @param string $element HTML element/tag
+ * @return array|bool List of attributes found in $element. Returns false on failure.
+ */
+function wp_kses_attr_parse( $element ) {
+    $valid = preg_match('%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches);
+    if ( 1 !== $valid ) {
+        return false;
+    }
+
+    $begin =  $matches[1];
+    $slash =  $matches[2];
+    $elname = $matches[3];
+    $attr =   $matches[4];
+    $end =    $matches[5];
+
+    if ( '' !== $slash ) {
+        // Closing elements do not get parsed.
+        return false;
+    }
+
+    // Is there a closing XHTML slash at the end of the attributes?
+    if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
+        $xhtml_slash = $matches[0];
+        $attr = substr( $attr, 0, -strlen( $xhtml_slash ) );
+    } else {
+        $xhtml_slash = '';
+    }
+    
+    // Split it
+    $attrarr = wp_kses_hair_parse( $attr );
+    if ( false === $attrarr ) {
+        return false;
+    }
+
+    // Make sure all input is returned by adding front and back matter.
+    array_unshift( $attrarr, $begin . $slash . $elname );
+    array_push( $attrarr, $xhtml_slash . $end );
+    
+    return $attrarr;
+}
+
+/**
+ * Builds an attribute list from string containing attributes.
+ *
+ * Does not modify input.  May return "evil" output.
+ * In case of unexpected input, returns false instead of stripping things.
+ *
+ * Based on wp_kses_hair() but does not return a multi-dimensional array.
+ *
+ * @since 4.2.3
+ *
+ * @param string $attr Attribute list from HTML element to closing HTML element tag
+ * @return array|bool List of attributes found in $attr. Returns false on failure.
+ */
+function wp_kses_hair_parse( $attr ) {
+    if ( '' === $attr ) {
+        return array();
+    }
+
+    $regex =
+      '(?:'
+    .     '[-a-zA-Z:]+'   // Attribute name.
+    . '|'
+    .     '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html.
+    . ')'
+    . '(?:'               // Attribute value.
+    .     '\s*=\s*'       // All values begin with '='
+    .     '(?:'
+    .         '"[^"]*"'   // Double-quoted
+    .     '|'
+    .         "'[^']*'"   // Single-quoted
+    .     '|'
+    .         '[^\s"\']+' // Non-quoted
+    .         '(?:\s|$)'  // Must have a space
+    .     ')'
+    . '|'
+    .     '(?:\s|$)'      // If attribute has no value, space is required.
+    . ')'
+    . '\s*';              // Trailing space is optional except as mentioned above.
+
+    // Although it is possible to reduce this procedure to a single regexp,
+    // we must run that regexp twice to get exactly the expected result.
+
+    $validation = "%^($regex)+$%";
+    $extraction = "%$regex%";
+
+    if ( 1 === preg_match( $validation, $attr ) ) {
+        preg_match_all( $extraction, $attr, $attrarr );
+        return $attrarr[0];
+    } else {
+        return false;
+    }
 }
 

branches/4.2/src/wp-includes/shortcodes.php

@@ -185 +185 @@
  *
  * @param string $content Content to search for shortcodes.
+ * @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
  * @return string Content with shortcodes filtered out.
  */
-function do_shortcode($content) {
+function do_shortcode( $content, $ignore_html = false ) {
     global $shortcode_tags;
 
@@ -197 +198 @@
         return $content;
 
+    $tagnames = array_keys($shortcode_tags);
+    $tagregexp = join( '|', array_map('preg_quote', $tagnames) );
+    $pattern = "/\\[($tagregexp)/s";
+
+    if ( 1 !== preg_match( $pattern, $content ) ) {
+        // Avoids parsing HTML when there are no shortcodes or embeds anyway.
+        return $content;
+    }
+
+    $content = do_shortcodes_in_html_tags( $content, $ignore_html );
+
     $pattern = get_shortcode_regex();
-    return preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
+    $content = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
+    
+    // Always restore square braces so we don't break things like <!--[if IE ]>
+    $content = unescape_invalid_shortcodes( $content );
+    
+    return $content;
 }
 
@@ -292 +309 @@
 
 /**
+ * Search only inside HTML elements for shortcodes and process them.
+ *
+ * Any [ or ] characters remaining inside elements will be HTML encoded
+ * to prevent interference with shortcodes that are outside the elements.
+ * Assumes $content processed by KSES already.  Users with unfiltered_html
+ * capability may get unexpected output if angle braces are nested in tags.
+ *
+ * @since 4.2.3
+ *
+ * @param string $content Content to search for shortcodes
+ * @param bool $ignore_html When true, all square braces inside elements will be encoded.
+ * @return string Content with shortcodes filtered out.
+ */
+function do_shortcodes_in_html_tags( $content, $ignore_html ) {
+    // Normalize entities in unfiltered HTML before adding placeholders.
+    $trans = array( '&#91;' => '&#091;', '&#93;' => '&#093;' );
+    $content = strtr( $content, $trans );
+    $trans = array( '[' => '&#91;', ']' => '&#93;' );
+    
+    $pattern = get_shortcode_regex();
+
+    $comment_regex =
+          '!'           // Start of comment, after the <.
+        . '(?:'         // Unroll the loop: Consume everything until --> is found.
+        .     '-(?!->)' // Dash not followed by end of comment.
+        .     '[^\-]*+' // Consume non-dashes.
+        . ')*+'         // Loop possessively.
+        . '(?:-->)?';   // End of comment. If not found, match all input.
+
+    $regex =
+          '/('                   // Capture the entire match.
+        .     '<'                // Find start of element.
+        .     '(?(?=!--)'        // Is this a comment?
+        .         $comment_regex // Find end of comment.
+        .     '|'
+        .         '[^>]*>?'      // Find end of element. If not found, match all input.
+        .     ')'
+        . ')/s';
+
+    $textarr = preg_split( $regex, $content, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
+
+    foreach ( $textarr as &$element ) {
+        if ( '<' !== $element[0] ) {
+            continue;
+        }
+
+        $noopen = false === strpos( $element, '[' );
+        $noclose = false === strpos( $element, ']' );
+        if ( $noopen || $noclose ) {
+            // This element does not contain shortcodes.
+            if ( $noopen xor $noclose ) {
+                // Need to encode stray [ or ] chars.
+                $element = strtr( $element, $trans );
+            }
+            continue;
+        }
+
+        if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) ) {
+            // Encode all [ and ] chars.
+            $element = strtr( $element, $trans );
+            continue;
+        }
+
+        $attributes = wp_kses_attr_parse( $element );
+        if ( false === $attributes ) {
+            // Looks like we found some crazy unfiltered HTML.  Skipping it for sanity.
+            $element = strtr( $element, $trans );
+            continue;
+        }
+        
+        // Get element name
+        $front = array_shift( $attributes );
+        $back = array_pop( $attributes );
+        $matches = array();
+        preg_match('%[a-zA-Z0-9]+%', $front, $matches);
+        $elname = $matches[0];
+        
+        // Look for shortcodes in each attribute separately.
+        foreach ( $attributes as &$attr ) {
+            $open = strpos( $attr, '[' );
+            $close = strpos( $attr, ']' );
+            if ( false === $open || false === $close ) {
+                continue; // Go to next attribute.  Square braces will be escaped at end of loop.
+            }
+            $double = strpos( $attr, '"' );
+            $single = strpos( $attr, "'" );
+            if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
+                // $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
+                // In this specific situation we assume KSES did not run because the input
+                // was written by an administrator, so we should avoid changing the output
+                // and we do not need to run KSES here.
+                $attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr );
+            } else {
+                // $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
+                // We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
+                $count = 0;
+                $new_attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr, -1, $count );
+                if ( $count > 0 ) {
+                    // Sanitize the shortcode output using KSES.
+                    $new_attr = wp_kses_one_attr( $new_attr, $elname );
+                    if ( '' !== $new_attr ) {
+                        // The shortcode is safe to use now.
+                        $attr = $new_attr;
+                    }
+                }
+            }
+        }
+        $element = $front . implode( '', $attributes ) . $back;
+        
+        // Now encode any remaining [ or ] chars.
+        $element = strtr( $element, $trans );
+    }
+    
+    $content = implode( '', $textarr );
+    
+    return $content;
+}
+
+/**
+ * Remove placeholders added by do_shortcodes_in_html_tags().
+ *
+ * @since 4.2.3
+ *
+ * @param string $content Content to search for placeholders.
+ * @return string Content with placeholders removed.
+ */
+function unescape_invalid_shortcodes( $content ) {
+        // Clean up entire string, avoids re-parsing HTML.
+        $trans = array( '&#91;' => '[', '&#93;' => ']' );
+        $content = strtr( $content, $trans );
+        
+        return $content;
+}
+
+/**
  * Retrieve all attributes from the shortcodes tag.
  *
@@ -390 +542 @@
         return $content;
 
+    $content = do_shortcodes_in_html_tags( $content, true );
+
     $pattern = get_shortcode_regex();
-
-    return preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
+    $content = preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
+
+    // Always restore square braces so we don't break things like <!--[if IE ]>
+    $content = unescape_invalid_shortcodes( $content );
+    
+    return $content;
 }
 

branches/4.2/tests/phpunit/tests/kses.php

@@ -412 +412 @@
         );
     }
+
+    /**
+     * Test new function wp_kses_hair_parse().
+     *
+     * @dataProvider data_hair_parse
+     */
+    function test_hair_parse( $input, $output ) {
+        return $this->assertEquals( $output, wp_kses_hair_parse( $input ) );
+    }
+
+    function data_hair_parse() {
+        return array(
+            array(
+                'title="hello" href="#" id="my_id" ',
+                array( 'title="hello" ', 'href="#" ', 'id="my_id" ' ),
+            ),
+            array(
+                '[shortcode attr="value"] href="http://www.google.com/"title="moo"disabled',
+                array( '[shortcode attr="value"] ', 'href="http://www.google.com/"', 'title="moo"', 'disabled' ),
+            ),
+            array(
+                '',
+                array(),
+            ),
+            array(
+                'a',
+                array( 'a' ),
+            ),
+            array(
+                'title="hello"disabled href=# id=\'my_id\'',
+                array( 'title="hello"', 'disabled ', 'href=# ', "id='my_id'" ),
+            ),
+            array(
+                '     ', // Calling function is expected to strip leading whitespace.
+                false,
+            ),
+            array(
+                'abcd=abcd"abcd"',
+                false,
+            ),
+            array(
+                "array[1]='z'z'z'z",
+                false,
+            ),
+        );
+    }
+
+    /**
+     * Test new function wp_kses_attr_parse().
+     *
+     * @dataProvider data_attr_parse
+     */
+    function test_attr_parse( $input, $output ) {
+        return $this->assertEquals( $output, wp_kses_attr_parse( $input ) );
+    }
+
+    function data_attr_parse() {
+        return array(
+            array(
+                '<a title="hello" href="#" id="my_id" >',
+                array( '<a ', 'title="hello" ', 'href="#" ', 'id="my_id" ', '>' ),
+            ),
+            array(
+                '<a [shortcode attr="value"] href="http://www.google.com/"title="moo"disabled>',
+                array( '<a ', '[shortcode attr="value"] ', 'href="http://www.google.com/"', 'title="moo"', 'disabled', '>' ),
+            ),
+            array(
+                '',
+                false,
+            ),
+            array(
+                'a',
+                false,
+            ),
+            array(
+                '<a>',
+                array( '<a', '>' ),
+            ),
+            array(
+                '<a%%&&**>',
+                false,
+            ),
+            array(
+                '<a title="hello"disabled href=# id=\'my_id\'>',
+                array( '<a ', 'title="hello"', 'disabled ', 'href=# ', "id='my_id'", ">" ),
+            ),
+            array(
+                '<a     >',
+                array( '<a     ', '>' ),
+            ),
+            array(
+                '<a abcd=abcd"abcd">',
+                false,
+            ),
+            array(
+                "<a array[1]='z'z'z'z>",
+                false,
+            ),
+            array(
+                '<img title="hello" src="#" id="my_id" />',
+                array( '<img ', 'title="hello" ', 'src="#" ', 'id="my_id"', ' />' ),
+            ),
+        );
+    }
+
+    /**
+     * Test new function wp_kses_one_attr().
+     *
+     * @dataProvider data_one_attr
+     */
+    function test_one_attr( $element, $input, $output ) {
+        return $this->assertEquals( $output, wp_kses_one_attr( $input, $element ) );
+    }
+
+    function data_one_attr() {
+        return array(
+            array(
+                'a',
+                ' title="hello" ',
+                ' title="hello" ',
+            ),
+            array(
+                'a',
+                'title  =  "hello"',
+                'title="hello"',
+            ),
+            array(
+                'a',
+                "title='hello'",
+                "title='hello'",
+            ),
+            array(
+                'a',
+                'title=hello',
+                'title="hello"',
+            ),
+            array(
+                'a',
+                'href="javascript:alert(1)"',
+                'href="alert(1)"',
+            ),
+            array(
+                'a',
+                'style ="style "',
+                'style="style"',
+            ),
+            array(
+                'a',
+                'style="style "',
+                'style="style"',
+            ),
+            array(
+                'a',
+                'style ="style ="',
+                '',
+            ),
+            array(
+                'img',
+                'src="mypic.jpg"',
+                'src="mypic.jpg"',
+            ),
+            array(
+                'img',
+                'onerror=alert(1)',
+                '',
+            ),
+            array(
+                'img',
+                'title=>',
+                'title="&gt;"',
+            ),
+            array(
+                'img',
+                'title="&garbage";"',
+                'title="&amp;garbage&quot;;"',
+            ),
+        );
+    }
 }

branches/4.2/tests/phpunit/tests/shortcode.php

@@ -387 +387 @@
 
     /**
+     * Check for bugginess using normal input with latest patches.
+     *
+     * @dataProvider data_escaping
+     */
+    function test_escaping( $input, $output ) {
+        return $this->assertEquals( $output, do_shortcode( $input ) );
+    }
+
+    function data_escaping() {
+        return array(
+            array(
+                '<!--[if lt IE 7]>',
+                '<!--[if lt IE 7]>',
+            ),
+            array(
+                '[gallery title="<div>hello</div>"]',
+                '',
+            ),
+            array(
+                '[caption caption="test" width="2"]<div>hello</div>[/caption]',
+                '<div style="width: 12px" class="wp-caption alignnone"><div>hello</div><p class="wp-caption-text">test</p></div>',
+            ),
+            array(
+                '<div [gallery]>',
+                '<div >',
+            ),
+            array(
+                '<div [[gallery]]>',
+                '<div [gallery]>',
+            ),
+            array(
+                '[gallery]<div>Hello</div>[/gallery]',
+                '',
+            ),
+        );
+    }
+
+    /**
+     * Check for bugginess using normal input with latest patches.
+     *
+     * @dataProvider data_escaping2
+     */
+    function test_escaping2( $input, $output ) {
+        return $this->assertEquals( $output, strip_shortcodes( $input ) );
+    }
+
+    function data_escaping2() {
+        return array(
+            array(
+                '<!--[if lt IE 7]>',
+                '<!--[if lt IE 7]>',
+            ),
+            array(
+                '[gallery title="<div>hello</div>"]',
+                '',
+            ),
+            array(
+                '[caption caption="test" width="2"]<div>hello</div>[/caption]',
+                '',
+            ),
+            array(
+                '<div [gallery]>', // Shortcodes will never be stripped inside elements.
+                '<div [gallery]>',
+            ),
+            array(
+                '<div [[gallery]]>', // Shortcodes will never be stripped inside elements.
+                '<div [[gallery]]>',
+            ),
+            array(
+                '[gallery]<div>Hello</div>[/gallery]',
+                '',
+            ),
+        );
+    }
+
+    /**
      * @ticket 26343
      */