28 lines
739 B
Go
28 lines
739 B
Go
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package nametransform
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import (
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"fmt"
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"strings"
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)
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// IsValidName checks if `name` is a valid name for a normal file
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// (does not contain null bytes or "/" etc...).
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func IsValidName(name string) error {
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if name == "" {
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return fmt.Errorf("empty input")
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}
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if len(name) > NameMax {
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return fmt.Errorf("too long")
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}
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// A name can never contain a null byte or "/". Make sure we never return those
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// to the kernel, even when we read a corrupted (or fuzzed) filesystem.
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if strings.Contains(name, "\000") || strings.Contains(name, "/") {
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return fmt.Errorf("contains forbidden bytes")
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}
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// The name should never be "." or "..".
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if name == "." || name == ".." {
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return fmt.Errorf(". and .. are forbidden names")
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}
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return nil
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}
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