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bus: Try to get groups directly from credentials, not userdb

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If we avoid consulting the userdb, then it's one less chance to
deadlock.

Signed-off-by: Simon McVittie <smcv@collabora.com>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=103737
Reviewed-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Simon McVittie 2018-01-15 19:45:39 +00:00
parent 005bded7a8
commit aaf690e805
1 changed files with 32 additions and 0 deletions
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32
bus/connection.c
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@ -1033,11 +1033,43 @@ bus_connection_get_unix_groups (DBusConnection *connection,
int *n_groups,
DBusError *error)
{
/* Assigning dbus_gid_t to unsigned long is lossless (in fact
* they are the same type) */
_DBUS_STATIC_ASSERT (sizeof (unsigned long) == sizeof (dbus_gid_t));
const dbus_gid_t *groups_borrowed = NULL;
DBusCredentials *credentials;
unsigned long uid;
size_t n = 0;
*groups = NULL;
*n_groups = 0;
credentials = _dbus_connection_get_credentials (connection);
if (credentials != NULL &&
_dbus_credentials_get_unix_gids (credentials, &groups_borrowed, &n))
{
size_t i;
/* We got the group IDs from SO_PEERGROUPS or equivalent - no
* need to ask NSS */
*n_groups = n;
*groups = dbus_new (unsigned long, n);
if (groups == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
for (i = 0; i < n; i++)
(*groups)[i] = groups_borrowed[i];
return TRUE;
}
if (dbus_connection_get_unix_user (connection, &uid))
{
if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))