indent/fix-heap-buffer-overwrite-search_brace-CVE-2023-40305.patch
Danilo Spinella b6046b21bf Accepting request 1105123 from home:ateixeira:branches:devel:tools
- Fix memory safety issues, bsc#1214243, CVE-2023-40305:
  * fix-out-of-buffer-read-CVE-2023-40305.patch
  * fix-heap-buffer-overwrite-search_brace-CVE-2023-40305.patch

OBS-URL: https://build.opensuse.org/request/show/1105123
OBS-URL: https://build.opensuse.org/package/show/devel:tools/indent?expand=0&rev=20
2023-08-22 10:58:07 +00:00

4250 lines
14 KiB
Diff

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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+ */
+ {
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;