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tests: Exercise NSS group lookup before running tests

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Similar to #256, NSS plugins might open file descriptors the first time
they look up a system group, and leave them open. To avoid detecting
this as a leak, do one group lookup (which we expect to fail) before
starting testing, so that the fd is already open the first time we
call _dbus_check_fdleaks_enter(), and therefore is not considered to
have been leaked in _dbus_check_fdleaks_leave().

Resolves: https://gitlab.freedesktop.org/dbus/dbus/-/issues/540
Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2024-12-10 14:31:59 +00:00
parent e3c3cd6889
commit 7cbb7b75dd
1 changed files with 9 additions and 3 deletions
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12
test/test-utils.c
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@ -788,14 +788,20 @@ _dbus_test_main (int argc,
* show up as having been "leaked" by the first module of code under
* test that happens to do a NSS lookup. */
{
DBusString username;
DBusString lookup;
dbus_uid_t ignored_uid = DBUS_UID_UNSET;
dbus_gid_t ignored_gid = DBUS_GID_UNSET;
_dbus_string_init_const (&username, "dbus-no-user-with-this-name");
_dbus_string_init_const (&lookup, "dbus-no-user-with-this-name");
/* We use a username that almost certainly doesn't exist, because
* if we used something like root it might get handled early in the
* NSS search order, before we get as far as asking sssd or LDAP. */
_dbus_parse_unix_user_from_config (&username, &ignored_uid);
_dbus_parse_unix_user_from_config (&lookup, &ignored_uid);
/* Same for groups */
_dbus_string_init_const (&lookup, "dbus-no-group-with-this-name");
_dbus_parse_unix_group_from_config (&lookup, &ignored_gid);
_dbus_test_check_memleaks ("initial nss query");
}