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qapi: Restrict strings to printable ASCII

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RFC 8259 on string contents:

   All Unicode characters may be placed within the quotation marks,
   except for the characters that MUST be escaped: quotation mark,
   reverse solidus, and the control characters (U+0000 through
   U+001F).

The QAPI schema parser accepts both less and more than JSON: it
accepts only ASCII with \u (less), and accepts control characters
other than LF (new line) unescaped.  How it treats unescaped non-ASCII
input differs between Python 2 and Python 3.

Make it accept strictly less: require printable ASCII.  Drop support
for \b, \f, \n, \r, \t.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190913201349.24332-7-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2019-09-13 22:13:39 +02:00
parent 05d6ecd049
commit 56a8caff92
12 changed files with 20 additions and 21 deletions
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tests/qapi-schema/string-code-point-31.err Normal file
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tests/qapi-schema/string-code-point-31.json:2:14: Funny character in string