diff options
Diffstat (limited to 'meta/recipes-devtools/git/files/CVE-2022-41903-09.patch')
| -rw-r--r-- | meta/recipes-devtools/git/files/CVE-2022-41903-09.patch | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/meta/recipes-devtools/git/files/CVE-2022-41903-09.patch b/meta/recipes-devtools/git/files/CVE-2022-41903-09.patch new file mode 100644 index 0000000000..761d4c6a9f --- /dev/null +++ b/meta/recipes-devtools/git/files/CVE-2022-41903-09.patch @@ -0,0 +1,162 @@ +From 937b71cc8b5b998963a7f9a33312ba3549d55510 Mon Sep 17 00:00:00 2001 +From: Patrick Steinhardt <ps@pks.im> +Date: Thu, 1 Dec 2022 15:47:04 +0100 +Subject: [PATCH 09/12] utf8: fix overflow when returning string width + +The return type of both `utf8_strwidth()` and `utf8_strnwidth()` is +`int`, but we operate on string lengths which are typically of type +`size_t`. This means that when the string is longer than `INT_MAX`, we +will overflow and thus return a negative result. + +This can lead to an out-of-bounds write with `--pretty=format:%<1)%B` +and a commit message that is 2^31+1 bytes long: + + ================================================================= + ==26009==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000001168 at pc 0x7f95c4e5f427 bp 0x7ffd8541c900 sp 0x7ffd8541c0a8 + WRITE of size 2147483649 at 0x603000001168 thread T0 + #0 0x7f95c4e5f426 in __interceptor_memcpy /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 + #1 0x5612bbb1068c in format_and_pad_commit pretty.c:1763 + #2 0x5612bbb1087a in format_commit_item pretty.c:1801 + #3 0x5612bbc33bab in strbuf_expand strbuf.c:429 + #4 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869 + #5 0x5612bbb12d96 in pretty_print_commit pretty.c:2161 + #6 0x5612bba0a4d5 in show_log log-tree.c:781 + #7 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117 + #8 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508 + #9 0x5612bb69235b in cmd_log_walk builtin/log.c:549 + #10 0x5612bb6951a2 in cmd_log builtin/log.c:883 + #11 0x5612bb56c993 in run_builtin git.c:466 + #12 0x5612bb56d397 in handle_builtin git.c:721 + #13 0x5612bb56db07 in run_argv git.c:788 + #14 0x5612bb56e8a7 in cmd_main git.c:923 + #15 0x5612bb803682 in main common-main.c:57 + #16 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f) + #17 0x7f95c4c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349) + #18 0x5612bb5680e4 in _start ../sysdeps/x86_64/start.S:115 + + 0x603000001168 is located 0 bytes to the right of 24-byte region [0x603000001150,0x603000001168) + allocated by thread T0 here: + #0 0x7f95c4ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85 + #1 0x5612bbcdd556 in xrealloc wrapper.c:136 + #2 0x5612bbc310a3 in strbuf_grow strbuf.c:99 + #3 0x5612bbc32acd in strbuf_add strbuf.c:298 + #4 0x5612bbc33aec in strbuf_expand strbuf.c:418 + #5 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869 + #6 0x5612bbb12d96 in pretty_print_commit pretty.c:2161 + #7 0x5612bba0a4d5 in show_log log-tree.c:781 + #8 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117 + #9 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508 + #10 0x5612bb69235b in cmd_log_walk builtin/log.c:549 + #11 0x5612bb6951a2 in cmd_log builtin/log.c:883 + #12 0x5612bb56c993 in run_builtin git.c:466 + #13 0x5612bb56d397 in handle_builtin git.c:721 + #14 0x5612bb56db07 in run_argv git.c:788 + #15 0x5612bb56e8a7 in cmd_main git.c:923 + #16 0x5612bb803682 in main common-main.c:57 + #17 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f) + + SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy + Shadow bytes around the buggy address: + 0x0c067fff81d0: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa + 0x0c067fff81e0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd + 0x0c067fff81f0: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa + 0x0c067fff8200: fd fd fd fa fa fa fd fd fd fd fa fa 00 00 00 fa + 0x0c067fff8210: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd + =>0x0c067fff8220: fd fa fa fa fd fd fd fa fa fa 00 00 00[fa]fa fa + 0x0c067fff8230: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff8240: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff8250: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff8260: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff8270: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + Shadow byte legend (one shadow byte represents 8 application bytes): + Addressable: 00 + Partially addressable: 01 02 03 04 05 06 07 + Heap left redzone: fa + Freed heap region: fd + Stack left redzone: f1 + Stack mid redzone: f2 + Stack right redzone: f3 + Stack after return: f5 + Stack use after scope: f8 + Global redzone: f9 + Global init order: f6 + Poisoned by user: f7 + Container overflow: fc + Array cookie: ac + Intra object redzone: bb + ASan internal: fe + Left alloca redzone: ca + Right alloca redzone: cb + ==26009==ABORTING + +Now the proper fix for this would be to convert both functions to return +an `size_t` instead of an `int`. But given that this commit may be part +of a security release, let's instead do the minimal viable fix and die +in case we see an overflow. + +Add a test that would have previously caused us to crash. + +Signed-off-by: Patrick Steinhardt <ps@pks.im> +Signed-off-by: Junio C Hamano <gitster@pobox.com> + +Upstream-Status: Backport [https://github.com/git/git/commit/937b71cc8b5b998963a7f9a33312ba3549d55510] +CVE: CVE-2022-41903 +Signed-off-by: Vijay Anusuri <vanusuri@mvista.com> +--- + t/t4205-log-pretty-formats.sh | 8 ++++++++ + utf8.c | 12 +++++++++--- + 2 files changed, 17 insertions(+), 3 deletions(-) + +diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh +index 261a6f0..de15007 100755 +--- a/t/t4205-log-pretty-formats.sh ++++ b/t/t4205-log-pretty-formats.sh +@@ -843,4 +843,12 @@ test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit mes + test_cmp expect actual + ' + ++test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message does not cause allocation failure' ' ++ test_must_fail git log -1 --format="%<(1)%B" $huge_commit 2>error && ++ cat >expect <<-EOF && ++ fatal: number too large to represent as int on this platform: 2147483649 ++ EOF ++ test_cmp expect error ++' ++ + test_done +diff --git a/utf8.c b/utf8.c +index 6632bd2..03be475 100644 +--- a/utf8.c ++++ b/utf8.c +@@ -208,11 +208,12 @@ int utf8_width(const char **start, size_t *remainder_p) + */ + int utf8_strnwidth(const char *string, size_t len, int skip_ansi) + { +- int width = 0; + const char *orig = string; ++ size_t width = 0; + + while (string && string < orig + len) { +- int glyph_width, skip; ++ int glyph_width; ++ size_t skip; + + while (skip_ansi && + (skip = display_mode_esc_sequence_len(string)) != 0) +@@ -222,7 +223,12 @@ int utf8_strnwidth(const char *string, size_t len, int skip_ansi) + if (glyph_width > 0) + width += glyph_width; + } +- return string ? width : len; ++ ++ /* ++ * TODO: fix the interface of this function and `utf8_strwidth()` to ++ * return `size_t` instead of `int`. ++ */ ++ return cast_size_t_to_int(string ? width : len); + } + + int utf8_strwidth(const char *string) +-- +2.25.1 + |