b6046b21bf
- 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
4192 lines
12 KiB
Diff
4192 lines
12 KiB
Diff
From d091dae6b9080859cd47b85fc0a73e572d40d9be Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
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Date: Tue, 15 Aug 2023 14:09:06 +0200
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Subject: [PATCH 1/2] Fix an out-of-buffer read in search_brace()/lexi() on an
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condition without parentheses followed with an overlong comment
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Reproducer:
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$ hexdump -C /tmp/short
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00000000 69 66 20 30 3b 65 6c 73 65 2f 2a 0a 0a 0a 0a 0a |if 0;else/*.....|
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00000010 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a |................|
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*
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00000800 0a 0a 2a 2f 78 0a |..*/x.|
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00000806
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$ valgrind -- ./indent -o /dev/null /tmp/short
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[...]
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==21830== Invalid read of size 1
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==21830== at 0x40586A: lexi (lexi.c:251)
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==21830== by 0x40198C: search_brace (indent.c:387)
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==21830== by 0x401CC2: indent_main_loop (indent.c:548)
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==21830== by 0x402298: indent (indent.c:758)
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==21830== by 0x402941: indent_single_file (indent.c:1003)
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==21830== by 0x402A0F: indent_all (indent.c:1041)
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==21830== by 0x402BC5: main (indent.c:1122)
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==21830== Address 0x4ab2210 is 0 bytes inside a block of size 2,048 free'd
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==21830== at 0x4847A40: realloc (vg_replace_malloc.c:1649)
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==21830== by 0x408BC0: xrealloc (globs.c:64)
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==21830== by 0x40BF03: need_chars (handletoken.c:89)
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==21830== by 0x401433: sw_buffer (indent.c:149)
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==21830== by 0x401973: search_brace (indent.c:380)
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==21830== by 0x401CC2: indent_main_loop (indent.c:548)
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==21830== by 0x402298: indent (indent.c:758)
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==21830== by 0x402941: indent_single_file (indent.c:1003)
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==21830== by 0x402A0F: indent_all (indent.c:1041)
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==21830== by 0x402BC5: main (indent.c:1122)
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==21830== Block was alloc'd at
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==21830== at 0x4847A40: realloc (vg_replace_malloc.c:1649)
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==21830== by 0x408BC0: xrealloc (globs.c:64)
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==21830== by 0x40BF03: need_chars (handletoken.c:89)
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==21830== by 0x401696: search_brace (indent.c:281)
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==21830== by 0x401CC2: indent_main_loop (indent.c:548)
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==21830== by 0x402298: indent (indent.c:758)
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==21830== by 0x402941: indent_single_file (indent.c:1003)
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==21830== by 0x402A0F: indent_all (indent.c:1041)
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==21830== by 0x402BC5: main (indent.c:1122)
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The cause was that need_chars(&save_com, ...) could reallocate save_com.ptr
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pointer keeping a dangling copy of that pointer saved to buf_ptr
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a line above.
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Related to CVE-2023-40305
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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regression/TEST | 3 +-
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regression/input/comment-heap-overread.c | 2040 ++++++++++++++++++
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regression/standard/comment-heap-overread.c | 2042 +++++++++++++++++++
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src/indent.c | 2 +-
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4 files changed, 4085 insertions(+), 2 deletions(-)
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create mode 100644 regression/input/comment-heap-overread.c
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create mode 100644 regression/standard/comment-heap-overread.c
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diff --git a/regression/TEST b/regression/TEST
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index 37d0664..0933e9b 100755
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--- a/regression/TEST
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+++ b/regression/TEST
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@@ -39,7 +39,8 @@ BUGS="case-label.c one-line-1.c one-line-2.c one-line-3.c \
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one-line-4.c struct-decl.c sizeof-in-while.c line-break-comment.c \
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macro.c enum.c elif.c nested.c wrapped-string.c minus_predecrement.c \
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bug-gnu-33364.c float-constant-suffix.c block-comments.c \
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- no-forced-nl-in-block-init.c hexadecimal_float.c binary-constant.c"
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+ no-forced-nl-in-block-init.c hexadecimal_float.c binary-constant.c \
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+ comment-heap-overread.c"
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INDENTSRC="args.c backup.h backup.c dirent_def.h globs.c indent.h \
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indent.c indent_globs.h io.c lexi.c memcpy.c parse.c pr_comment.c \
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diff --git a/regression/input/comment-heap-overread.c b/regression/input/comment-heap-overread.c
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new file mode 100644
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index 0000000..5b0b172
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--- /dev/null
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+++ b/regression/input/comment-heap-overread.c
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@@ -0,0 +1,2040 @@
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+if 0;else/*
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+*/x
|
|
diff --git a/regression/standard/comment-heap-overread.c b/regression/standard/comment-heap-overread.c
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new file mode 100644
|
|
index 0000000..e601fb4
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--- /dev/null
|
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+++ b/regression/standard/comment-heap-overread.c
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@@ -0,0 +1,2042 @@
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+if 0;
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+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
|
|
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