cve-check-tool: backport a patch to make CVE checking work

CVE checking in OE didn't work as do_populate_cve_db failed with the following
error message.

  [snip]/downloads/CVE_CHECK/nvdcve-2.0-2002.xml is not consistent

Backport a patch to fix this error.

(From OE-Core rev: ee55b5685aaa4be92d6d51f8641a559d4e34ce64)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/cve-check-tool/cve-check-tool_5.6.4.bb

@@ -10,6 +10,7 @@ SRC_URI = "https://github.com/ikeydoherty/${BPN}/releases/download/v${PV}/${BP}.
            file://check-for-malloc_trim-before-using-it.patch \
            file://0001-print-progress-in-percent-when-downloading-CVE-db.patch \
            file://0001-curl-allow-overriding-default-CA-certificate-file.patch \
+           file://0001-update-Compare-computed-vs-expected-sha256-digit-str.patch \
           "
 
 SRC_URI[md5sum] = "c5f4247140fc9be3bf41491d31a34155"

meta/recipes-devtools/cve-check-tool/files/0001-update-Compare-computed-vs-expected-sha256-digit-str.patch

@@ -0,0 +1,52 @@
+From b0426e63c9ac61657e029f689bcb8dd051e752c6 Mon Sep 17 00:00:00 2001
+From: Sergey Popovich <popovich_sergei@mail.ua>
+Date: Fri, 21 Apr 2017 07:32:23 -0700
+Subject: [PATCH] update: Compare computed vs expected sha256 digit string
+ ignoring case
+
+We produce sha256 digest string using %x snprintf()
+qualifier for each byte of digest which uses alphabetic
+characters from "a" to "f" in lower case to represent
+integer values from 10 to 15.
+
+Previously all of the NVD META files supply sha256
+digest string for corresponding XML file in lower case.
+
+However due to some reason this changed recently to
+provide digest digits in upper case causing fetched
+data consistency checks to fail. This prevents database
+from being updated periodically.
+
+While commit c4f6e94 (update: Do not treat sha256 failure
+as fatal if requested) adds useful option to skip
+digest validation at all and thus provides workaround for
+this situation, it might be unacceptable for some
+deployments where we need to ensure that downloaded
+data is consistent before start parsing it and update
+SQLite database.
+
+Use strcasecmp() to compare two digest strings case
+insensitively and addressing this case.
+
+Upstream-Status: Backport
+Signed-off-by: Sergey Popovich <popovich_sergei@mail.ua>
+---
+ src/update.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/update.c b/src/update.c
+index 8588f38..3cc6b67 100644
+--- a/src/update.c
++++ b/src/update.c
+@@ -187,7 +187,7 @@ static bool nvdcve_data_ok(const char *meta, const char *data)
+                 snprintf(&csum_data[idx], len, "%02hhx", digest[i]);
+         }
+ 
+-        ret = streq(csum_meta, csum_data);
++        ret = !strcasecmp(csum_meta, csum_data);
+ 
+ err_unmap:
+         munmap(buffer, length);
+-- 
+2.11.0
+