As with .gitattributes and .gitignore, we would like to make sure that
.mailmap files are handled consistently whether read from the a blob (as
is the default behavior in a bare repo) or from the filesystem.
Likewise, we would like to avoid reading out-of-tree files pointed to by
a symlink, which could have security implications in certain setups.
We can cover both by using open_nofollow() when opening the in-tree
files. We'll continue to follow links for mailmap.file, as well as when
reading .mailmap from the current directory when outside of a repository
entirely.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
mailmap.c | 22 +++++++++++++++++-----
t/t4203-mailmap.sh | 31 +++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+), 5 deletions(-)
diff --git a/mailmap.c b/mailmap.c
index eb77c6e77c..7ac966107e 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -157,20 +157,30 @@ static void read_mailmap_line(struct string_list *map, char *buffer)
add_mapping(map, name1, email1, name2, email2);
}
-static int read_mailmap_file(struct string_list *map, const char *filename)
+/* Flags for read_mailmap_file() */
+#define MAILMAP_NOFOLLOW (1<<0)
+
+static int read_mailmap_file(struct string_list *map, const char *filename,
+ unsigned flags)
{
char buffer[1024];
FILE *f;
+ int fd;
if (!filename)
return 0;
- f = fopen(filename, "r");
- if (!f) {
+ if (flags & MAILMAP_NOFOLLOW)
+ fd = open_nofollow(filename, O_RDONLY);
+ else
+ fd = open(filename, O_RDONLY);
+
+ if (fd < 0) {
if (errno == ENOENT)
return 0;
return error_errno("unable to open mailmap at %s", filename);
}
+ f = xfdopen(fd, "r");
while (fgets(buffer, sizeof(buffer), f) != NULL)
read_mailmap_line(map, buffer);
@@ -225,10 +235,12 @@ int read_mailmap(struct string_list *map)
if (!git_mailmap_blob && is_bare_repository())
git_mailmap_blob = "HEAD:.mailmap";
- err |= read_mailmap_file(map, ".mailmap");
+ err |= read_mailmap_file(map, ".mailmap",
+ startup_info->have_repository ?
+ MAILMAP_NOFOLLOW : 0);
if (startup_info->have_repository)
err |= read_mailmap_blob(map, git_mailmap_blob);
- err |= read_mailmap_file(map, git_mailmap_file);
+ err |= read_mailmap_file(map, git_mailmap_file, 0);
return err;
}
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 621f9962d5..96a4e6132f 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -889,4 +889,35 @@ test_expect_success 'empty syntax: setup' '
test_cmp expect actual
'
+test_expect_success SYMLINKS 'set up symlink tests' '
+ git commit --allow-empty -m foo --author="Orig <orig@xxxxxxxxxxx>" &&
+ echo "New <new@xxxxxxxxxxx> <orig@xxxxxxxxxxx>" >map &&
+ rm -f .mailmap
+'
+
+test_expect_success SYMLINKS 'symlinks respected in mailmap.file' '
+ test_when_finished "rm symlink" &&
+ ln -s map symlink &&
+ git -c mailmap.file="$(pwd)/symlink" log -1 --format=%aE >actual &&
+ echo "new@xxxxxxxxxxx" >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success SYMLINKS 'symlinks respected in non-repo shortlog' '
+ git log -1 >input &&
+ test_when_finished "nongit rm .mailmap" &&
+ nongit ln -sf "$TRASH_DIRECTORY/map" .mailmap &&
+ nongit git shortlog -s <input >actual &&
+ echo " 1 New" >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success SYMLINKS 'symlinks not respected in-tree' '
+ test_when_finished "rm .mailmap" &&
+ ln -s map .mailmap &&
+ git log -1 --format=%aE >actual &&
+ echo "orig@xxxxxxxxxxx" >expect&&
+ test_cmp expect actual
+'
+
test_done
--
2.30.1.986.gd86016a168
