From 18e25107a68466fce17790e9c8d7d7e667651f55 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sat, 06 Apr 2019 22:29:32 -0400
Subject: patches: Fix security vulnerabilities

---
(limited to 'patches/02_bzip2recover-race-open-output.patch')

diff --git a/patches/02_bzip2recover-race-open-output.patch b/patches/02_bzip2recover-race-open-output.patch
new file mode 100644
index 0000000..3a91e97
--- /dev/null
+++ b/patches/02_bzip2recover-race-open-output.patch
@@ -0,0 +1,46 @@
+Description: fix unsafe race condition in opening output files.
+Author: Colin Phipps <crp22@cam.ac.uk>
+Origin: Debian:
+ https://salsa.debian.org/debian/bzip2/blob/6baf99d2eb446f50f7986868b7d57e6f4fd9b459/debian/patches/bzip2recover-race-open-output.diff
+ https://sources.debian.org/src/bzip2/1.0.6-9/debian/patches/bzip2recover-race-open-output.diff/
+
+--- a/bzip2recover.c
++++ b/bzip2recover.c
+@@ -24,6 +24,8 @@
+ #include <errno.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <fcntl.h>
++#include <unistd.h>
+ 
+ 
+ /* This program records bit locations in the file to be recovered.
+@@ -269,6 +271,19 @@
+        name[n-1] == '2');
+ }
+ 
++/*---------------------------------------------*/
++/* Open an output file safely with O_EXCL and good permissions */
++FILE* fopen_output( Char* name, const char* mode )
++{
++  FILE *fp;
++  int   fh;
++
++  fh = open(name, O_WRONLY|O_CREAT|O_EXCL, 0600);
++  if (fh == -1) return NULL;
++  fp = fdopen(fh, mode);
++  if (fp == NULL) close(fh);
++  return fp;
++}
+ 
+ /*---------------------------------------------------*/
+ /*---                                             ---*/
+@@ -486,7 +501,7 @@
+          fprintf ( stderr, "   writing block %d to `%s' ...\n",
+                            wrBlock+1, outFileName );
+ 
+-         outFile = fopen ( outFileName, "wb" );
++         outFile = fopen_output ( outFileName, "wb" );
+          if (outFile == NULL) {
+             fprintf ( stderr, "%s: can't write `%s'\n",
+                       progName, outFileName );
--
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