File fix-heap-buffer-overwrite-search_brace-CVE-2023-40305.patch of Package indent

From 61b6e7d6496052a1c04f29ade66921217554bfeb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Tue, 15 Aug 2023 19:00:56 +0200
Subject: [PATCH 2/2] Fix a heap buffer overwrite in search_brace()
 (CVE-2023-40305)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

If there was a comment between if-condition and an statement opening
bracket and the comment size aligned to an indent-internal 1024 B
buffer for comments, indent attempted to write into a nonallocated
memory on heap.

$ hexdump -C /tmp/write1
00000000  69 66 20 30 3b 65 6c 73  65 2f 2a 0a 0a 0a 0a 0a  |if 0;else/*.....|
00000010  0a 0a 0a 0a 0a 0a 0a 0a  0a 0a 0a 0a 0a 0a 0a 0a  |................|
*
00000800  0a 0a 0a 0a 2a 2f 7b 0a                           |....*/{.|
00000808

$ valgrind -- ./indent -o /dev/null /tmp/write1 2>&1 | head -n 23
==26345== Memcheck, a memory error detector
==26345== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==26345== Using Valgrind-3.21.0 and LibVEX; rerun with -h for copyright info
==26345== Command: ./indent -o /dev/null /tmp/write1
==26345==
==26345== Invalid write of size 1
==26345==    at 0x401558: search_brace (indent.c:232)
==26345==    by 0x401CB2: indent_main_loop (indent.c:548)
==26345==    by 0x402288: indent (indent.c:758)
==26345==    by 0x402931: indent_single_file (indent.c:1003)
==26345==    by 0x4029FF: indent_all (indent.c:1041)
==26345==    by 0x402BA6: main (indent.c:1122)
==26345==  Address 0x4aa7830 is 0 bytes after a block of size 2,048 alloc'd
==26345==    at 0x4847A40: realloc (vg_replace_malloc.c:1649)
==26345==    by 0x408BA1: xrealloc (globs.c:64)
==26345==    by 0x40BEE4: need_chars (handletoken.c:89)
==26345==    by 0x401686: search_brace (indent.c:281)
==26345==    by 0x401CB2: indent_main_loop (indent.c:548)
==26345==    by 0x402288: indent (indent.c:758)
==26345==    by 0x402931: indent_single_file (indent.c:1003)
==26345==    by 0x4029FF: indent_all (indent.c:1041)
==26345==    by 0x402BA6: main (indent.c:1122)

The cause was that the buffer was exhausted by the comment text and no
space left for the following new-line and curly bracket characters.

This patch fixes it by enlarging the buffer two fit these two
additional characters.

<https://savannah.gnu.org/bugs/index.php?64503>

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 regression/TEST                               |   44 +-
 regression/input/comment-heap-overwrite.c     | 2042 ++++++++++++++++
 regression/standard/comment-heap-overwrite.c  | 2044 +++++++++++++++++
 .../standard/comment-heap-overwrite.err       |    1 +
 src/indent.c                                  |    1 +
 5 files changed, 4111 insertions(+), 21 deletions(-)
 create mode 100644 regression/input/comment-heap-overwrite.c
 create mode 100644 regression/standard/comment-heap-overwrite.c
 create mode 100644 regression/standard/comment-heap-overwrite.err

Index: b/regression/TEST
===================================================================
--- a/regression/TEST
+++ b/regression/TEST
@@ -429,6 +429,7 @@ echo Testing new comment stuff...Done.
 
 
 echo Testing bad code handling....
+ERR=output/errors
 
 # print_comment() was reading past the end of the buffer...
 echo -ne '/*' | $INDENT -npro -st > /dev/null 2>&1
@@ -446,31 +447,33 @@ then
     echo >> $ERR
 fi
 
-# This ends in a error from indent but it shouldn't coredump.
-$INDENT -npro input/bug206785.c -o output/bug206785.c 2>output/bug206785.err
-
-if [ $? -ne 2 ]
-then
-    printf ERROR: bad return status from indent. | tee -a $ERR
-    echo >> $ERR
-fi
-cd output
-
-for i in bug206785.c bug206785.err
-do
-  printf ...$i...
-  diff --initial-tab ../standard/$i $i > $i-diffs 2>&1
-  if [ -s $i-diffs ]
-  then
-    printf ERROR: $i failed | tee -a $ERR
-    echo >> $ERR
-  else
-    rm $i-diffs
-    rm $i
-  fi
-  echo
+# This ends in an error from indent but it shouldn't coredump.
+for TEST in bug206785 comment-heap-overwrite; do
+    $INDENT -npro input/"$TEST".c -o output/"$TEST".c 2>output/"$TEST".err
+
+    if [ $? -ne 2 ]
+    then
+        printf "ERROR: bad return status from indent for %s.c" "$TEST" | tee -a $ERR
+        echo >> $ERR
+    fi
+
+    for i in "$TEST".c "$TEST".err
+    do
+      printf "...%s..." "$i"
+      diff --initial-tab standard/"$i" output/"$i" > output/"$i"-diffs 2>&1
+      if [ -s output/"$i"-diffs ]
+      then
+        printf "ERROR: %s failed" "$i" | tee -a $ERR
+        echo >> $ERR
+      else
+        rm output/"$i"-diffs
+        rm output/"$i"
+      fi
+      echo
+    done
 done
-
+cd output
+ERR=errors
 echo Testing bad code handling...Done.
 
 # Now see if any errors occured.  If so, bitch and moan, otherwise,
Index: b/regression/input/comment-heap-overwrite.c
===================================================================
--- /dev/null
+++ b/regression/input/comment-heap-overwrite.c
@@ -0,0 +1,2042 @@
+if 0;else/*
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+*/{
Index: b/regression/standard/comment-heap-overwrite.c
===================================================================
--- /dev/null
+++ b/regression/standard/comment-heap-overwrite.c
@@ -0,0 +1,2044 @@
+if 0;
+else				/*
+
+
+
+
+
+
+
+
+
+
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+
+
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+				 */
+  {
Index: b/regression/standard/comment-heap-overwrite.err
===================================================================
--- /dev/null
+++ b/regression/standard/comment-heap-overwrite.err
@@ -0,0 +1 @@
+indent: input/comment-heap-overwrite.c:2044: Error:Unexpected end of file
Index: b/src/indent.c
===================================================================
--- a/src/indent.c
+++ b/src/indent.c
@@ -228,6 +228,7 @@ static BOOLEAN search_brace(
                  * a `dump_line' call, thus ensuring that the brace
                  * will go into the right column. */
 
+                need_chars (&save_com, 2);
                 *save_com.end++ = EOL;
                 *save_com.end++ = '{';
                 save_com.len += 2;
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