Fix Busybox CVE-2017-16544 issue

diff --git a/package/utils/busybox/patches/900-fix_cve2017-16544.patch b/package/utils/busybox/patches/900-fix_cve2017-16544.patch
new file mode 100644 (file)
index 0000000..4fd77e8
--- /dev/null
+++ b/package/utils/busybox/patches/900-fix_cve2017-16544.patch
@@ -0,0 +1,22 @@
+--- a/libbb/lineedit.c
++++ b/libbb/lineedit.c
+@@ -632,6 +632,19 @@ static void free_tab_completion_data(voi
+ 
+ static void add_match(char *matched)
+ {
++      unsigned char *p = (unsigned char*)matched;
++      while (*p) {
++              /* ESC attack fix: drop any string with control chars */
++              if (*p < ' '
++               || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
++               || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
++              ) {
++                      free(matched);
++                      return;
++              }
++              p++;
++      }
++
+       matches = xrealloc_vector(matches, 4, num_matches);
+       matches[num_matches] = matched;
+       num_matches++;