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commit 94ab2088c37d8e4285354af120b7ed6b887b9e53
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Author: Sam James <sam@gentoo.org>
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Date: Sun Jun 5 04:57:10 2022 +0100
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nss: handle stat failure in check_reload_and_get (BZ #28752)
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Skip the chroot test if the database isn't loaded
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correctly (because the chroot test uses some
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existing DB state).
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The __stat64_time64 -> fstatat call can fail if
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running under an (aggressive) seccomp filter,
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like Firefox seems to use.
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This manifested in a crash when using glib built
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with FAM support with such a Firefox build.
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Suggested-by: DJ Delorie <dj@redhat.com>
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Signed-off-by: Sam James <sam@gentoo.org>
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Reviewed-by: DJ Delorie <dj@redhat.com>
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(cherry picked from commit ace9e3edbca62d978b1e8f392d8a5d78500272d9)
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diff --git a/nss/nss_database.c b/nss/nss_database.c
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index 54561f03287db2e4..e807e9d84ca03680 100644
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--- a/nss/nss_database.c
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+++ b/nss/nss_database.c
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@@ -420,23 +420,32 @@ nss_database_check_reload_and_get (struct nss_database_state *local,
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return true;
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}
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- /* Before we reload, verify that "/" hasn't changed. We assume that
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- errors here are very unlikely, but the chance that we're entering
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- a container is also very unlikely, so we err on the side of both
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- very unlikely things not happening at the same time. */
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- if (__stat64_time64 ("/", &str) != 0
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- || (local->root_ino != 0
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- && (str.st_ino != local->root_ino
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- || str.st_dev != local->root_dev)))
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+ int stat_rv = __stat64_time64 ("/", &str);
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+
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+ if (local->data.services[database_index] != NULL)
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{
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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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- return true;
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+ /* Before we reload, verify that "/" hasn't changed. We assume that
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+ errors here are very unlikely, but the chance that we're entering
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+ a container is also very unlikely, so we err on the side of both
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+ very unlikely things not happening at the same time. */
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+ if (stat_rv != 0
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+ || (local->root_ino != 0
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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 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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+ return true;
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+ }
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+ }
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+ if (stat_rv == 0)
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+ {
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+ local->root_ino = str.st_ino;
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+ local->root_dev = str.st_dev;
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}
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- local->root_ino = str.st_ino;
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- local->root_dev = str.st_dev;
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+
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__libc_lock_unlock (local->lock);
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/* Avoid overwriting the global configuration until we have loaded
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