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authorSergei Trofimovich <slyfox@gentoo.org>2021-02-05 07:32:18 +0000
committerDJ Delorie <dj@redhat.com>2021-02-05 13:07:10 -0500
commitc3479fb7939898ec22c655c383454d6e8b982a67 (patch)
tree7f5a514f3602b691721804e8281304e085b7510d /nss
parent921e6f419867ae0ec15b6b5182f194a8229e7941 (diff)
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nsswitch: return result when nss database is locked [BZ #27343]
Before the change nss_database_check_reload_and_get() did not populate
the '*result' value when it returned success in a case of chroot
detection. This caused initgroups() to use garage pointer in the
following test (extracted from unbound):

```

int main() {
    // load some NSS modules
    struct passwd * pw = getpwnam("root");

    chdir("/tmp");
    chroot("/tmp");
    chdir("/");
    // access nsswitch.conf in a chroot
    initgroups("root", 0);
}
```

Reviewed-by: DJ Delorie <dj@redhat.com>
Diffstat (limited to 'nss')
-rw-r--r--nss/nss_database.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/nss/nss_database.c b/nss/nss_database.c
index cf0306adc4..e1bef6bd75 100644
--- a/nss/nss_database.c
+++ b/nss/nss_database.c
@@ -398,8 +398,9 @@ nss_database_check_reload_and_get (struct nss_database_state *local,
 	  && (str.st_ino != local->root_ino
 	      ||  str.st_dev != local->root_dev)))
     {
-      /* Change detected; disable reloading.  */
+      /* Change detected; disable reloading and return current state.  */
       atomic_store_release (&local->data.reload_disabled, 1);
+      *result = local->data.services[database_index];
       __libc_lock_unlock (local->lock);
       __nss_module_disable_loading ();
       return true;