gnu: jq: Fix CVE-2015-8863.

* gnu/packages/patches/jq-CVE-2015-8863.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/web.scm (jq)[source]: Use it.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu/local.mk

@@ -595,6 +595,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/jasper-CVE-2016-2089.patch		\
   %D%/packages/patches/jasper-CVE-2016-2116.patch		\
   %D%/packages/patches/jbig2dec-ignore-testtest.patch		\
+  %D%/packages/patches/jq-CVE-2015-8863.patch			\
   %D%/packages/patches/khmer-use-libraries.patch                \
   %D%/packages/patches/kmod-module-directory.patch		\
   %D%/packages/patches/laby-make-install.patch			\

gnu/packages/patches/jq-CVE-2015-8863.patch

@@ -0,0 +1,45 @@
+Fix CVE-2015-8863 (Off-by-one error in the tokenadd function in
+jv_parse.c in jq allows remote attackers to cause a denial of service
+(crash) via a long JSON-encoded number, which triggers a heap-based
+buffer overflow):
+
+<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8863>
+
+Copied from upstream code repository:
+
+<https://github.com/stedolan/jq/commit/8eb1367ca44e772963e704a700ef72ae2e12babd>
+
+From 8eb1367ca44e772963e704a700ef72ae2e12babd Mon Sep 17 00:00:00 2001
+From: Nicolas Williams <nico@cryptonector.com>
+Date: Sat, 24 Oct 2015 17:24:57 -0500
+Subject: [PATCH] Heap buffer overflow in tokenadd() (fix #105)
+
+This was an off-by one: the NUL terminator byte was not allocated on
+resize.  This was triggered by JSON-encoded numbers longer than 256
+bytes.
+---
+ jv_parse.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/jv_parse.c b/jv_parse.c
+index 3102ed4..84245b8 100644
+--- a/jv_parse.c
++++ b/jv_parse.c
+@@ -383,7 +383,7 @@ static pfunc stream_token(struct jv_parser* p, char ch) {
+ 
+ static void tokenadd(struct jv_parser* p, char c) {
+   assert(p->tokenpos <= p->tokenlen);
+-  if (p->tokenpos == p->tokenlen) {
++  if (p->tokenpos >= (p->tokenlen - 1)) {
+     p->tokenlen = p->tokenlen*2 + 256;
+     p->tokenbuf = jv_mem_realloc(p->tokenbuf, p->tokenlen);
+   }
+@@ -485,7 +485,7 @@ static pfunc check_literal(struct jv_parser* p) {
+     TRY(value(p, v));
+   } else {
+     // FIXME: better parser
+-    p->tokenbuf[p->tokenpos] = 0; // FIXME: invalid
++    p->tokenbuf[p->tokenpos] = 0;
+     char* end = 0;
+     double d = jvp_strtod(&p->dtoa, p->tokenbuf, &end);
+     if (end == 0 || *end != 0)

gnu/packages/web.scm

@@ -3293,7 +3293,11 @@ It uses the uwsgi protocol for all the networking/interprocess communications.")
                                   "/" name "-" version ".tar.gz"))
               (sha256
                (base32
-                "0g29kyz4ykasdcrb0zmbrp2jqs9kv1wz9swx849i2d1ncknbzln4"))))
+                "0g29kyz4ykasdcrb0zmbrp2jqs9kv1wz9swx849i2d1ncknbzln4"))
+              ;; This patch has been pushed and the vulnerability will be
+              ;; fixed in the next release after 1.5.
+              ;; https://github.com/stedolan/jq/issues/995
+              (patches (search-patches "jq-CVE-2015-8863.patch"))))
     (inputs
      `(("oniguruma" ,oniguruma)))
     (native-inputs