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autofs-5.1.8 - fix hosts map deadlock on restart
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From: Ian Kent <raven@themaw.net>
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When starting automount(8) with a hosts map that has mounts that were
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in use at the last exit a deadlock can occur.
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In this case automount(8) will perform the same steps but not actually
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perform the mount to re-construct the context of each mount. But, with
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the hosts map, that leads to calling back into the sun parse module
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while holding the map module read lock which will again try and take
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the write lock.
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Fix this by only taking the write lock in the mount code path if the
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module handle has not already been opened.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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daemon/lookup.c | 22 ++++++++++++----------
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modules/parse_amd.c | 18 ++++++++++--------
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3 files changed, 23 insertions(+), 18 deletions(-)
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--- autofs-5.1.7.orig/CHANGELOG
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+++ autofs-5.1.7/CHANGELOG
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@@ -107,6 +107,7 @@
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- fix parse module instance mutex naming.
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- serialise lookup module open and reinit.
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- coverity fix for invalid access.
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+- fix hosts map deadlock on restart.
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25/01/2021 autofs-5.1.7
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- make bind mounts propagation slave by default.
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--- autofs-5.1.7.orig/daemon/lookup.c
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+++ autofs-5.1.7/daemon/lookup.c
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@@ -807,19 +807,21 @@ int do_lookup_mount(struct autofs_point
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struct lookup_mod *lookup;
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int status;
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- map_module_writelock(map);
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if (!map->lookup) {
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- status = open_lookup(map->type, "",
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- map->format, map->argc, map->argv, &lookup);
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- if (status != NSS_STATUS_SUCCESS) {
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- map_module_unlock(map);
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- debug(ap->logopt,
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- "lookup module %s open failed", map->type);
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- return status;
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+ map_module_writelock(map);
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+ if (!map->lookup) {
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+ status = open_lookup(map->type, "",
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+ map->format, map->argc, map->argv, &lookup);
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+ if (status != NSS_STATUS_SUCCESS) {
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+ map_module_unlock(map);
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+ debug(ap->logopt,
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+ "lookup module %s open failed", map->type);
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+ return status;
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+ }
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+ map->lookup = lookup;
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}
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- map->lookup = lookup;
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+ map_module_unlock(map);
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}
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- map_module_unlock(map);
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master_source_current_wait(ap->entry);
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ap->entry->current = map;
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--- autofs-5.1.7.orig/modules/parse_amd.c
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+++ autofs-5.1.7/modules/parse_amd.c
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@@ -1370,17 +1370,19 @@ static int do_host_mount(struct autofs_p
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}
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}
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- map_module_writelock(instance);
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if (!instance->lookup) {
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- status = open_lookup("hosts", MODPREFIX, NULL, argc, pargv, &lookup);
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- if (status != NSS_STATUS_SUCCESS) {
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- map_module_unlock(instance);
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- debug(ap->logopt, "open lookup module hosts failed");
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- goto out;
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+ map_module_writelock(instance);
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+ if (!instance->lookup) {
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+ status = open_lookup("hosts", MODPREFIX, NULL, argc, pargv, &lookup);
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+ if (status != NSS_STATUS_SUCCESS) {
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+ map_module_unlock(instance);
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+ debug(ap->logopt, "open lookup module hosts failed");
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+ goto out;
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+ }
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+ instance->lookup = lookup;
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}
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- instance->lookup = lookup;
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+ map_module_unlock(instance);
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}
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- map_module_unlock(instance);
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cache_writelock(source->mc);
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me = cache_lookup_distinct(source->mc, name);
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