1 files changed, 79 insertions, 0 deletions
diff --git a/patches/source/patch/0001-Refuse-to-apply-ed-scripts-by-default.patch b/patches/source/patch/0001-Refuse-to-apply-ed-scripts-by-default.patch
new file mode 100644
index 00000000..46d9fcf5
--- /dev/null
+++ b/patches/source/patch/0001-Refuse-to-apply-ed-scripts-by-default.patch
@@ -0,0 +1,79 @@
+From 5046e5605cf7420d9a11de49bd9fe4851a4ca1d2 Mon Sep 17 00:00:00 2001
+From: Saleem Rashid <dev@saleemrashid.com>
+Date: Thu, 5 Apr 2018 22:48:25 +0100
+Subject: [PATCH] Refuse to apply ed scripts by default
+
+* src/patch.c, src/pch.c: Warn that ed scripts are potentially
+dangerous, unless patch is invoked with --force
+
+This fixes an issue where ed scripts could be included in a patch, executing
+arbitrary shell commands without the user's knowledge.
+
+Original bug report:
+https://savannah.gnu.org/bugs/index.php?53566
+---
+ src/patch.c                | 13 +++++++++++--
+ src/pch.c                  | 11 +++++++++++
+ 6 files changed, 62 insertions(+), 5 deletions(-)
+
+diff --git a/src/patch.c b/src/patch.c
+index 0fe6d72..e14a9c4 100644
+--- a/src/patch.c
++++ b/src/patch.c
+@@ -781,7 +781,7 @@ static char const *const option_help[] =
+ "  -l  --ignore-whitespace  Ignore white space changes between patch and input.",
+ "",
+ "  -c  --context  Interpret the patch as a context difference.",
+-"  -e  --ed  Interpret the patch as an ed script.",
++"  -e  --ed  Interpret the patch as a potentially dangerous ed script.  This could allow arbitrary command execution!",
+ "  -n  --normal  Interpret the patch as a normal difference.",
+ "  -u  --unified  Interpret the patch as a unified difference.",
+ "",
+@@ -825,7 +825,7 @@ static char const *const option_help[] =
+ "Miscellaneous options:",
+ "",
+ "  -t  --batch  Ask no questions; skip bad-Prereq patches; assume reversed.",
+-"  -f  --force  Like -t, but ignore bad-Prereq patches, and assume unreversed.",
++"  -f  --force  Like -t, but ignore bad-Prereq patches, apply potentially dangerous ed scripts, and assume unreversed.",
+ "  -s  --quiet  --silent  Work silently unless an error occurs.",
+ "  --verbose  Output extra information about the work being done.",
+ "  --dry-run  Do not actually change any files; just print what would happen.",
+@@ -1068,6 +1068,15 @@ get_some_switches (void)
+ 	}
+     }
+ 
++    if (! force && diff_type == ED_DIFF)
++     {
++      ask ("Apply potentially dangerous ed script?  This could allow arbitrary command execution!  [n] ");
++      if (*buf != 'y')
++       {
++	  fatal ("Refusing to apply potentially dangerous ed script.");
++       }
++     }
++
+     /* Process any filename args.  */
+     if (optind < Argc)
+       {
+diff --git a/src/pch.c b/src/pch.c
+index bc6278c..ab34dd4 100644
+--- a/src/pch.c
++++ b/src/pch.c
+@@ -1001,6 +1001,17 @@ intuit_diff_type (bool need_header, mode_t *p_file_type)
+ 	instat = st[i];
+       }
+ 
++    if (! force && retval == ED_DIFF)
++     {
++      ask ("Apply potentially dangerous ed script?  This could allow arbitrary command execution!  [n] ");
++      if (*buf != 'y')
++       {
++	  if (verbosity != SILENT)
++	      say ("Skipping potentially dangerous ed script.\n");
++	  skip_rest_of_patch = true;
++       }
++     }
++
+     return retval;
+ }
+ 
+