File fix-out-of-buffer-read-CVE-2023-40305.patch of Package indent

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File fix-out-of-buffer-read-CVE-2023-40305.patch of Package indent (Revision 74399d650d5f3300c773b982049609cf)

Currently displaying revision 74399d650d5f3300c773b982049609cf , Show latest

From d091dae6b9080859cd47b85fc0a73e572d40d9be 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 14:09:06 +0200
Subject: [PATCH 1/2] Fix an out-of-buffer read in search_brace()/lexi() on an
 condition without parentheses followed with an overlong comment
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Reproducer:

$ hexdump -C /tmp/short
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 2a 2f 78 0a                                 |..*/x.|
00000806

$ valgrind -- ./indent -o /dev/null /tmp/short
[...]
==21830== Invalid read of size 1
==21830==    at 0x40586A: lexi (lexi.c:251)
==21830==    by 0x40198C: search_brace (indent.c:387)
==21830==    by 0x401CC2: indent_main_loop (indent.c:548)
==21830==    by 0x402298: indent (indent.c:758)
==21830==    by 0x402941: indent_single_file (indent.c:1003)
==21830==    by 0x402A0F: indent_all (indent.c:1041)
==21830==    by 0x402BC5: main (indent.c:1122)
==21830==  Address 0x4ab2210 is 0 bytes inside a block of size 2,048 free'd
==21830==    at 0x4847A40: realloc (vg_replace_malloc.c:1649)
==21830==    by 0x408BC0: xrealloc (globs.c:64)
==21830==    by 0x40BF03: need_chars (handletoken.c:89)
==21830==    by 0x401433: sw_buffer (indent.c:149)
==21830==    by 0x401973: search_brace (indent.c:380)
==21830==    by 0x401CC2: indent_main_loop (indent.c:548)
==21830==    by 0x402298: indent (indent.c:758)
==21830==    by 0x402941: indent_single_file (indent.c:1003)
==21830==    by 0x402A0F: indent_all (indent.c:1041)
==21830==    by 0x402BC5: main (indent.c:1122)
==21830==  Block was alloc'd at
==21830==    at 0x4847A40: realloc (vg_replace_malloc.c:1649)
==21830==    by 0x408BC0: xrealloc (globs.c:64)
==21830==    by 0x40BF03: need_chars (handletoken.c:89)
==21830==    by 0x401696: search_brace (indent.c:281)
==21830==    by 0x401CC2: indent_main_loop (indent.c:548)
==21830==    by 0x402298: indent (indent.c:758)
==21830==    by 0x402941: indent_single_file (indent.c:1003)
==21830==    by 0x402A0F: indent_all (indent.c:1041)
==21830==    by 0x402BC5: main (indent.c:1122)

The cause was that need_chars(&save_com, ...) could reallocate save_com.ptr
pointer keeping a dangling copy of that pointer saved to buf_ptr
a line above.

Related to CVE-2023-40305

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 regression/TEST                             |    3 +-
 regression/input/comment-heap-overread.c    | 2040 ++++++++++++++++++
 regression/standard/comment-heap-overread.c | 2042 +++++++++++++++++++
 src/indent.c                                |    2 +-
 4 files changed, 4085 insertions(+), 2 deletions(-)
 create mode 100644 regression/input/comment-heap-overread.c
 create mode 100644 regression/standard/comment-heap-overread.c

diff --git a/regression/TEST b/regression/TEST
index 37d0664..0933e9b 100755
--- a/regression/TEST
+++ b/regression/TEST
@@ -39,7 +39,8 @@ BUGS="case-label.c one-line-1.c one-line-2.c one-line-3.c \
         one-line-4.c struct-decl.c sizeof-in-while.c line-break-comment.c \
         macro.c enum.c elif.c nested.c wrapped-string.c minus_predecrement.c \
         bug-gnu-33364.c float-constant-suffix.c block-comments.c \
-        no-forced-nl-in-block-init.c hexadecimal_float.c binary-constant.c"
+        no-forced-nl-in-block-init.c hexadecimal_float.c binary-constant.c \
+        comment-heap-overread.c"
 
 INDENTSRC="args.c backup.h backup.c dirent_def.h globs.c indent.h \
         indent.c indent_globs.h io.c lexi.c memcpy.c parse.c pr_comment.c \
diff --git a/regression/input/comment-heap-overread.c b/regression/input/comment-heap-overread.c
new file mode 100644
index 0000000..5b0b172
--- /dev/null
+++ b/regression/input/comment-heap-overread.c
@@ -0,0 +1,2040 @@
+if 0;else/*
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+*/x
diff --git a/regression/standard/comment-heap-overread.c b/regression/standard/comment-heap-overread.c
new file mode 100644
index 0000000..e601fb4
--- /dev/null
+++ b/regression/standard/comment-heap-overread.c
@@ -0,0 +1,2042 @@
+if 0;
+else				/*
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+				 */
+  x
diff --git a/src/indent.c b/src/indent.c
index fc69974..3f9ffc9 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -145,8 +145,8 @@ static void sw_buffer(void)
     parser_state_tos->search_brace = false;
     bp_save = buf_ptr;
     be_save = buf_end;
-    buf_ptr = save_com.ptr;
     need_chars (&save_com, 1);
+    buf_ptr = save_com.ptr;
     buf_end = save_com.end;
     save_com.end = save_com.ptr;        /* make save_com empty */
 }
-- 
2.41.0

Places

File fix-out-of-buffer-read-CVE-2023-40305.patch of Package indent (Revision 74399d650d5f3300c773b982049609cf)

Places