nspr: Fix for CVE-2014-1545

Mozilla Netscape Portable Runtime (NSPR) before 4.10.6 allows remote
attackers to execute arbitrary code or cause a denial of service
(out-of-bounds write) via vectors involving the sprintf and console
functions.Per: http://cwe.mitre.org/data/definitions/787.html

(From OE-Core rev: 191cab2f679491c2b6ddba49c5cf4886dcd22f57)

Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com>
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/nspr/nspr/nspr-CVE-2014-1545.patch

@@ -0,0 +1,67 @@
+Fix for CVE-2014-1545
+
+Upstream-Status: Backport
+
+Backported from nspr-4.10.6.tar.gz.
+---
+--- a/pr/src/io/prprf.c
++++ b/pr/src/io/prprf.c
+@@ -50,6 +50,10 @@
+ #include "prlog.h"
+ #include "prmem.h"
+ 
++#ifdef _MSC_VER
++#define snprintf _snprintf
++#endif
++
+ /*
+ ** WARNING: This code may *NOT* call PR_LOG (because PR_LOG calls it)
+ */
+@@ -330,7 +334,7 @@
+ ** Convert a double precision floating point number into its printable
+ ** form.
+ **
+-** XXX stop using sprintf to convert floating point
++** XXX stop using snprintf to convert floating point
+ */
+ static int cvt_f(SprintfState *ss, double d, const char *fmt0, const char *fmt1)
+ {
+@@ -338,15 +342,14 @@
+     char fout[300];
+     int amount = fmt1 - fmt0;
+ 
+-    PR_ASSERT((amount > 0) && (amount < sizeof(fin)));
+-    if (amount >= sizeof(fin)) {
+-	/* Totally bogus % command to sprintf. Just ignore it */
++    if (amount <= 0 || amount >= sizeof(fin)) {
++        /* Totally bogus % command to snprintf. Just ignore it */
+ 	return 0;
+     }
+     memcpy(fin, fmt0, amount);
+     fin[amount] = 0;
+ 
+-    /* Convert floating point using the native sprintf code */
++    /* Convert floating point using the native snprintf code */
+ #ifdef DEBUG
+     {
+         const char *p = fin;
+@@ -356,14 +359,11 @@
+         }
+     }
+ #endif
+-    sprintf(fout, fin, d);
+-
+-    /*
+-    ** This assert will catch overflow's of fout, when building with
+-    ** debugging on. At least this way we can track down the evil piece
+-    ** of calling code and fix it!
+-    */
+-    PR_ASSERT(strlen(fout) < sizeof(fout));
++    memset(fout, 0, sizeof(fout));
++    snprintf(fout, sizeof(fout), fin, d);
++    /* Explicitly null-terminate fout because on Windows snprintf doesn't
++     * append a null-terminator if the buffer is too small. */
++    fout[sizeof(fout) - 1] = '\0';
+ 
+     return (*ss->stuff)(ss, fout, strlen(fout));
+ }

meta/recipes-support/nspr/nspr_4.10.3.bb

@@ -9,6 +9,7 @@ SRC_URI = "ftp://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v${PV}/src/nspr-$
            file://remove-rpath-from-tests.patch \
            file://fix-build-on-x86_64.patch \
            file://trickly-fix-build-on-x86_64.patch \
+           file://nspr-CVE-2014-1545.patch \
           "
 
 SRC_URI += "file://nspr.pc.in"