43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
commit 17f0ff097887008b2d3dca270c8ffbb4b43a8749
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Author: Sergei Trofimovich <slyfox@gentoo.org>
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Date: Fri Feb 5 07:32:18 2021 +0000
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nsswitch: return result when nss database is locked [BZ #27343]
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Before the change nss_database_check_reload_and_get() did not populate
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the '*result' value when it returned success in a case of chroot
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detection. This caused initgroups() to use garage pointer in the
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following test (extracted from unbound):
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```
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int main() {
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// load some NSS modules
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struct passwd * pw = getpwnam("root");
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chdir("/tmp");
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chroot("/tmp");
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chdir("/");
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// access nsswitch.conf in a chroot
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initgroups("root", 0);
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}
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```
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Reviewed-by: DJ Delorie <dj@redhat.com>
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diff --git a/nss/nss_database.c b/nss/nss_database.c
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index cf0306adc47f12d9..e1bef6bd75ce0160 100644
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--- a/nss/nss_database.c
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+++ b/nss/nss_database.c
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@@ -398,8 +398,9 @@ nss_database_check_reload_and_get (struct nss_database_state *local,
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&& (str.st_ino != local->root_ino
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|| str.st_dev != local->root_dev)))
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{
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- /* Change detected; disable reloading. */
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+ /* Change detected; disable reloading and return current state. */
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atomic_store_release (&local->data.reload_disabled, 1);
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+ *result = local->data.services[database_index];
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__libc_lock_unlock (local->lock);
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__nss_module_disable_loading ();
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return true;
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