Fix mode
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@ -487,8 +487,8 @@ class Filesystem
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$tmpFile = $dir.'/'.$prefix.uniqid(mt_rand(), true);
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// Use fopen instead of file_exists as some streams do not support stat
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// Use mode 'x' to atomically check existence and create to avoid a TOCTOU vulnerability
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$handle = @fopen($tmpFile, 'x');
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// Use mode 'x+' to atomically check existence and create to avoid a TOCTOU vulnerability
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$handle = @fopen($tmpFile, 'x+');
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// If unsuccessful restart the loop
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if (false === $handle) {
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