package/network/services/dropbear/patches/009-use-write-rather-than-fprintf-in-segv-handler.patch

   1 From 3292b8c6f1e5fcc405fa0f7a20e90a60f74037b2 Mon Sep 17 00:00:00 2001
   2 From: Matt Johnston <matt@ucc.asn.au>
   3 Date: Sun, 12 Feb 2023 23:00:00 +0800
   4 Subject: Use write() rather than fprintf() in segv handler
   5
   6 fprintf isn't guaranteed safe (though hasn't had any problems reported).
   7 ---
   8  svr-main.c | 8 ++++++--
   9  1 file changed, 6 insertions(+), 2 deletions(-)
  10
  11 --- a/svr-main.c
  12 +++ b/svr-main.c
  13 @@ -420,8 +420,12 @@ static void sigchld_handler(int UNUSED(u
  14
  15  /* catch any segvs */
  16  static void sigsegv_handler(int UNUSED(unused)) {
  17 -       fprintf(stderr, "Aiee, segfault! You should probably report "
  18 -                       "this as a bug to the developer\n");
  19 +       int i;
  20 +       const char *msg = "Aiee, segfault! You should probably report "
  21 +                       "this as a bug to the developer\n";
  22 +       i = write(STDERR_FILENO, msg, strlen(msg));
  23 +       /* ignore short writes */
  24 +       (void)i;
  25         _exit(EXIT_FAILURE);
  26  }
  27