diff options
Diffstat (limited to 'meta/recipes-devtools/git/files/CVE-2022-41903-03.patch')
| -rw-r--r-- | meta/recipes-devtools/git/files/CVE-2022-41903-03.patch | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/meta/recipes-devtools/git/files/CVE-2022-41903-03.patch b/meta/recipes-devtools/git/files/CVE-2022-41903-03.patch new file mode 100644 index 0000000000..d83d77eaf7 --- /dev/null +++ b/meta/recipes-devtools/git/files/CVE-2022-41903-03.patch @@ -0,0 +1,146 @@ +From b49f309aa16febeddb65e82526640a91bbba3be3 Mon Sep 17 00:00:00 2001 +From: Patrick Steinhardt <ps@pks.im> +Date: Thu, 1 Dec 2022 15:46:30 +0100 +Subject: [PATCH 03/12] pretty: fix out-of-bounds read when left-flushing with stealing + +With the `%>>(<N>)` pretty formatter, you can ask git-log(1) et al to +steal spaces. To do so we need to look ahead of the next token to see +whether there are spaces there. This loop takes into account ANSI +sequences that end with an `m`, and if it finds any it will skip them +until it finds the first space. While doing so it does not take into +account the buffer's limits though and easily does an out-of-bounds +read. + +Add a test that hits this behaviour. While we don't have an easy way to +verify this, the test causes the following failure when run with +`SANITIZE=address`: + + ==37941==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000000baf at pc 0x55ba6f88e0d0 bp 0x7ffc84c50d20 sp 0x7ffc84c50d10 + READ of size 1 at 0x603000000baf thread T0 + #0 0x55ba6f88e0cf in format_and_pad_commit pretty.c:1712 + #1 0x55ba6f88e7b4 in format_commit_item pretty.c:1801 + #2 0x55ba6f9b1ae4 in strbuf_expand strbuf.c:429 + #3 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869 + #4 0x55ba6f890ccf in pretty_print_commit pretty.c:2161 + #5 0x55ba6f7884c8 in show_log log-tree.c:781 + #6 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117 + #7 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508 + #8 0x55ba6f41035b in cmd_log_walk builtin/log.c:549 + #9 0x55ba6f4131a2 in cmd_log builtin/log.c:883 + #10 0x55ba6f2ea993 in run_builtin git.c:466 + #11 0x55ba6f2eb397 in handle_builtin git.c:721 + #12 0x55ba6f2ebb07 in run_argv git.c:788 + #13 0x55ba6f2ec8a7 in cmd_main git.c:923 + #14 0x55ba6f581682 in main common-main.c:57 + #15 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f) + #16 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349) + #17 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115 + + 0x603000000baf is located 1 bytes to the left of 24-byte region [0x603000000bb0,0x603000000bc8) + allocated by thread T0 here: + #0 0x7f2d08ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85 + #1 0x55ba6fa5b494 in xrealloc wrapper.c:136 + #2 0x55ba6f9aefdc in strbuf_grow strbuf.c:99 + #3 0x55ba6f9b0a06 in strbuf_add strbuf.c:298 + #4 0x55ba6f9b1a25 in strbuf_expand strbuf.c:418 + #5 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869 + #6 0x55ba6f890ccf in pretty_print_commit pretty.c:2161 + #7 0x55ba6f7884c8 in show_log log-tree.c:781 + #8 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117 + #9 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508 + #10 0x55ba6f41035b in cmd_log_walk builtin/log.c:549 + #11 0x55ba6f4131a2 in cmd_log builtin/log.c:883 + #12 0x55ba6f2ea993 in run_builtin git.c:466 + #13 0x55ba6f2eb397 in handle_builtin git.c:721 + #14 0x55ba6f2ebb07 in run_argv git.c:788 + #15 0x55ba6f2ec8a7 in cmd_main git.c:923 + #16 0x55ba6f581682 in main common-main.c:57 + #17 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f) + #18 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349) + #19 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115 + + SUMMARY: AddressSanitizer: heap-buffer-overflow pretty.c:1712 in format_and_pad_commit + Shadow bytes around the buggy address: + 0x0c067fff8120: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd + 0x0c067fff8130: fd fd fa fa fd fd fd fd fa fa fd fd fd fa fa fa + 0x0c067fff8140: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa + 0x0c067fff8150: fa fa fd fd fd fd fa fa 00 00 00 fa fa fa fd fd + 0x0c067fff8160: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa + =>0x0c067fff8170: fd fd fd fa fa[fa]00 00 00 fa fa fa 00 00 00 fa + 0x0c067fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff8190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff81a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff81b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa + 0x0c067fff81c0: 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 + +Luckily enough, this would only cause us to copy the out-of-bounds data +into the formatted commit in case we really had an ANSI sequence +preceding our buffer. So this bug likely has no security consequences. + +Fix it regardless by not traversing past the buffer's start. + +Reported-by: Patrick Steinhardt <ps@pks.im> +Reported-by: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de> +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/b49f309aa16febeddb65e82526640a91bbba3be3] +CVE: CVE-2022-41903 +Signed-off-by: Vijay Anusuri <vanusuri@mvista.com> +--- + pretty.c | 2 +- + t/t4205-log-pretty-formats.sh | 6 ++++++ + 2 files changed, 7 insertions(+), 1 deletion(-) + +diff --git a/pretty.c b/pretty.c +index 637e344..4348a82 100644 +--- a/pretty.c ++++ b/pretty.c +@@ -1468,7 +1468,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */ + if (*ch != 'm') + break; + p = ch - 1; +- while (ch - p < 10 && *p != '\033') ++ while (p > sb->buf && ch - p < 10 && *p != '\033') + p--; + if (*p != '\033' || + ch + 1 - p != display_mode_esc_sequence_len(p)) +diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh +index a2acee1..e69caba 100755 +--- a/t/t4205-log-pretty-formats.sh ++++ b/t/t4205-log-pretty-formats.sh +@@ -788,6 +788,12 @@ test_expect_success '%S in git log --format works with other placeholders (part + test_cmp expect actual + ' + ++test_expect_success 'log --pretty with space stealing' ' ++ printf mm0 >expect && ++ git log -1 --pretty="format:mm%>>|(1)%x30" >actual && ++ test_cmp expect actual ++' ++ + test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' ' + # We only assert that this command does not crash. This needs to be + # executed with the address sanitizer to demonstrate failure. +-- +2.25.1 + |