package/utils/busybox/patches/600-cve-2017-16544.patch

   1 From c3797d40a1c57352192c6106cc0f435e7d9c11e8 Mon Sep 17 00:00:00 2001
   2 From: Denys Vlasenko <vda.linux@googlemail.com>
   3 Date: Tue, 7 Nov 2017 18:09:29 +0100
   4 Subject: lineedit: do not tab-complete any strings which have control
   5  characters
   6
   7 function                                             old     new   delta
   8 add_match                                             41      68     +27
   9
  10 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
  11 ---
  12  libbb/lineedit.c | 12 ++++++++++++
  13  1 file changed, 12 insertions(+)
  14
  15 --- a/libbb/lineedit.c
  16 +++ b/libbb/lineedit.c
  17 @@ -633,6 +633,18 @@ static void free_tab_completion_data(voi
  18
  19  static void add_match(char *matched)
  20  {
  21 +       unsigned char *p = (unsigned char*)matched;
  22 +       while (*p) {
  23 +               /* ESC attack fix: drop any string with control chars */
  24 +               if (*p < ' '
  25 +                || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
  26 +                || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
  27 +               ) {
  28 +                       free(matched);
  29 +                       return;
  30 +               }
  31 +               p++;
  32 +       }
  33         matches = xrealloc_vector(matches, 4, num_matches);
  34         matches[num_matches] = matched;
  35         num_matches++;