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package/pkg-utils: escape \ in generated legal-info

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In the output of legal-info, which is JSON-formatted, we include the
CPI_ID (when it is valid).

For xerces, the CPE_ID contains two sequences of \+ (which is exactly
what is present in the NIST DB, [0]).

However, in JSON, like in C, \ escapes the following character; only a
very limited set of characters are valid to escape: " \ / b f n r t u.
Escaping any other character is invalid. Conformant JSON parser will
choke on invalid sequences, and so does not the json python module:

      File "/usr/lib/python2.7/json/decoder.py", line 380, in raw_decode
        obj, end = self.scan_once(s, idx)
    ValueError: Invalid \escape: line 1 column 608554 (char 608553)

We fix that be globally escaping \ in our json output, in the generic
sanitising macro.

[0] https://nvd.nist.gov/products/cpe/detail/645?namingFormat=2.3&orderBy=CPEURI&keyword=xerces&status=FINAL

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN 2021-02-06 09:51:02 +01:00 committed by Peter Korsgaard
parent 3658c1362b
commit e4c284e6b9
1 changed files with 2 additions and 1 deletions
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3
package/pkg-utils.mk
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@ -167,8 +167,9 @@ endef
clean-json = $(strip \ clean-json = $(strip \
$(subst $(comma)},}, $(subst $(comma)$(space)},$(space)}, \ $(subst $(comma)},}, $(subst $(comma)$(space)},$(space)}, \
$(subst $(comma)],], $(subst $(comma)$(space)],$(space)], \ $(subst $(comma)],], $(subst $(comma)$(space)],$(space)], \
$(subst \,\\, \
$(strip $(1)) \ $(strip $(1)) \
)))) \ ))))) \
) )
ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y) ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)