69 lines
2.3 KiB
Diff
69 lines
2.3 KiB
Diff
autofs-5.1.9 - fix deadlock in remount
|
|
|
|
From: Ian Kent <raven@themaw.net>
|
|
|
|
If we're starting up or trying to re-connect to an existing direct
|
|
mount we could be iterating through the map entries with the readlock
|
|
held so we can't just take the writelock for direct mounts. But when
|
|
trying to re-connect to an existing mount at startup there won't be
|
|
any other process updating the map entry cache.
|
|
|
|
Signed-off-by: Ian Kent <raven@themaw.net>
|
|
---
|
|
CHANGELOG | 1 +
|
|
modules/parse_sun.c | 26 ++++++++++++++++++++++++--
|
|
2 files changed, 25 insertions(+), 2 deletions(-)
|
|
|
|
--- autofs-5.1.7.orig/CHANGELOG
|
|
+++ autofs-5.1.7/CHANGELOG
|
|
@@ -160,6 +160,7 @@
|
|
- allow -null map in indirect maps.
|
|
- fix multi-mount check.
|
|
- fix get parent multi-mount check in try_remount().
|
|
+- fix deadlock in remount.
|
|
|
|
25/01/2021 autofs-5.1.7
|
|
- make bind mounts propagation slave by default.
|
|
--- autofs-5.1.7.orig/modules/parse_sun.c
|
|
+++ autofs-5.1.7/modules/parse_sun.c
|
|
@@ -889,7 +889,18 @@ update_offset_entry(struct autofs_point
|
|
strcpy(m_mapent, loc);
|
|
}
|
|
|
|
- cache_writelock(mc);
|
|
+ /*
|
|
+ * If we're starting up or trying to re-connect to an existing
|
|
+ * direct mount we could be iterating through the map entries
|
|
+ * with the readlock held so we can't just take the writelock
|
|
+ * for direct mounts. But at when trying to re-connect to an
|
|
+ * existing mount at startup there won't be any other process
|
|
+ * updating the map entry cache.
|
|
+ */
|
|
+ if (ap->state == ST_INIT && ap->flags & MOUNT_FLAG_REMOUNT)
|
|
+ cache_readlock(mc);
|
|
+ else
|
|
+ cache_writelock(mc);
|
|
ret = cache_update_offset(mc, name, m_key, m_mapent, age);
|
|
|
|
me = cache_lookup_distinct(mc, m_key);
|
|
@@ -1581,7 +1592,18 @@ dont_expand:
|
|
free(myoptions);
|
|
} while (*p == '/' || (*p == '"' && *(p + 1) == '/'));
|
|
|
|
- cache_writelock(mc);
|
|
+ /*
|
|
+ * If we're starting up or trying to re-connect to an existing
|
|
+ * direct mount we could be iterating through the map entries
|
|
+ * with the readlock held so we can't just take the writelock
|
|
+ * for direct mounts. But at when trying to re-connect to an
|
|
+ * existing mount at startup there won't be any other process
|
|
+ * updating the map entry cache.
|
|
+ */
|
|
+ if (ap->state == ST_INIT && ap->flags & MOUNT_FLAG_REMOUNT)
|
|
+ cache_readlock(mc);
|
|
+ else
|
|
+ cache_writelock(mc);
|
|
me = cache_lookup_distinct(mc, name);
|
|
if (!me) {
|
|
cache_unlock(mc);
|