File CVE-2023-29007-3.patch of Package git.32663
commit 3bb3d6bac5f2b496dfa2862dc1a84cbfa9b4449a
Author: Taylor Blau <me@ttaylorr.com>
Date: Wed Apr 12 19:18:28 2023 -0400
config.c: disallow overly-long lines in `copy_or_rename_section_in_file()`
As a defense-in-depth measure to guard against any potentially-unknown
buffer overflows in `copy_or_rename_section_in_file()`, refuse to work
with overly-long lines in a gitconfig.
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
diff --git a/config.c b/config.c
index e4189aa2d7..b8194dfd8a 100644
--- a/config.c
+++ b/config.c
@@ -3083,6 +3083,8 @@ static int section_name_is_ok(const char *name)
return 1;
}
+#define GIT_CONFIG_MAX_LINE_LEN (512 * 1024)
+
/* if new_name == NULL, the section is removed instead */
static int git_config_copy_or_rename_section_in_file(const char *config_filename,
const char *old_name,
@@ -3097,6 +3099,7 @@ static int git_config_copy_or_rename_section_in_file(const char *config_filename
struct stat st;
struct strbuf copystr = STRBUF_INIT;
struct config_store_data store;
+ uint32_t line_nr = 0;
memset(&store, 0, sizeof(store));
@@ -3137,6 +3140,16 @@ static int git_config_copy_or_rename_section_in_file(const char *config_filename
size_t i, length;
int is_section = 0;
char *output = buf.buf;
+
+ line_nr++;
+
+ if (buf.len >= GIT_CONFIG_MAX_LINE_LEN) {
+ ret = error(_("refusing to work with overly long line "
+ "in '%s' on line %"PRIuMAX),
+ config_filename, (uintmax_t)line_nr);
+ goto out;
+ }
+
for (i = 0; buf.buf[i] && isspace(buf.buf[i]); i++)
; /* do nothing */
if (buf.buf[i] == '[') {
diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 24c13b91db..de564cb8e5 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -633,6 +633,16 @@ test_expect_success 'renaming an embedded section with a long line' '
test_must_fail git config -f y foo.e
'
+test_expect_success 'renaming a section with an overly-long line' '
+ {
+ printf "[b]\\n" &&
+ printf " c = d %525000s e" " " &&
+ printf "[a] g = h\\n"
+ } >y &&
+ test_must_fail git config -f y --rename-section a xyz 2>err &&
+ test_i18ngrep "refusing to work with overly long line in .y. on line 2" err
+'
+
cat >> .git/config << EOF
[branch "zwei"] a = 1 [branch "vier"]
EOF