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Make regular expression for format strings more precise.

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This commit is contained in:
Max Schaefer
2020-02-06 12:28:49 +00:00
parent 8b0d271717
commit 69edfe08df
1 changed files with 7 additions and 3 deletions
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10
ql/src/semmle/go/StringOps.qll
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@@ -214,13 +214,17 @@ module StringOps {
* width and precision specifiers, but not including `*` specifiers or explicit argument
* indices.
*/
pragma[noinline]
private string getFormatComponentRegex() {
exists(string literal, string opt_flag, string opt_width, string operator, string verb |
exists(string literal, string opt_flag, string width, string prec, string opt_width_and_prec, string operator, string verb |
literal = "([^%]|%%)+" and
opt_flag = "[-+ #0]?" and
opt_width = "((\\d*|\\*)(\\.(\\d*|\\*))?)?" and
width = "\\d+|\\*" and
prec = "\\.(\\d+|\\*)" and
// either a width followed by an optional prec, or just a prec, or nothing
opt_width_and_prec = "((" + width + ")(" + prec + ")?|(" + prec + "))?" and
operator = "[bcdeEfFgGoOpqstTxXUv]" and
verb = "(%" + opt_flag + opt_width + operator + ")"
verb = "(%" + opt_flag + opt_width_and_prec + operator + ")"
|
result = "(" + literal + "|" + verb + ")"
)