Fix a SEGV that occurs during a restart when remounting already mounted
mounts. Jira: https://issues.redhat.com/browse/RHEL-18035 In commit 635b90ecc (autofs-5.1.8 - fix mount tree startup reconnect) when getting the parent the check for a multi-mount should include a check for the root of the multi-mount as well since the root does not set the parent. There's also a possible deadlock when re-connecting to existing direct mounts. 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 <ikent@redhat.com>
This commit is contained in:
Ian Kent
parent
985ef12d21
commit
5a4722cbbe
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@ -0,0 +1,68 @@
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autofs-5.1.9 - fix deadlock in remount
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From: Ian Kent <raven@themaw.net>
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If we're starting up or trying to re-connect to an existing direct mount
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we could be iterating through the map entries with the cache readlock
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held so we can't just take the writelock for direct mounts. But when
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trying to re-connect to an existing mount at startup there won't be any
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other process updating the map entry cache.
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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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modules/parse_sun.c | 26 ++++++++++++++++++++++++--
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2 files changed, 25 insertions(+), 2 deletions(-)
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--- autofs-5.1.4.orig/CHANGELOG
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+++ autofs-5.1.4/CHANGELOG
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@@ -153,6 +153,7 @@
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- allow -null map in indirect maps.
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- fix multi-mount check.
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- fix get parent multi-mount check in try_remount().
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+- fix deadlock in remount.
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xx/xx/2018 autofs-5.1.5
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- fix flag file permission.
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--- autofs-5.1.4.orig/modules/parse_sun.c
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+++ autofs-5.1.4/modules/parse_sun.c
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@@ -888,7 +888,18 @@ update_offset_entry(struct autofs_point
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strcpy(m_mapent, loc);
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}
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- cache_writelock(mc);
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+ /*
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+ * If we're starting up or trying to re-connect to an existing
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+ * direct mount we could be iterating through the map entries
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+ * with the readlock held so we can't just take the writelock
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+ * for direct mounts. But at when trying to re-connect to an
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+ * existing mount at startup there won't be any other process
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+ * updating the map entry cache.
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+ */
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+ if (ap->state == ST_INIT && ap->flags & MOUNT_FLAG_REMOUNT)
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+ cache_readlock(mc);
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+ else
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+ cache_writelock(mc);
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ret = cache_update_offset(mc, name, m_key, m_mapent, age);
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me = cache_lookup_distinct(mc, m_key);
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@@ -1580,7 +1591,18 @@ dont_expand:
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free(myoptions);
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} while (*p == '/' || (*p == '"' && *(p + 1) == '/'));
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- cache_writelock(mc);
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+ /*
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+ * If we're starting up or trying to re-connect to an existing
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+ * direct mount we could be iterating through the map entries
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+ * with the readlock held so we can't just take the writelock
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+ * for direct mounts. But at when trying to re-connect to an
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+ * existing mount at startup there won't be any other process
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+ * updating the map entry cache.
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+ */
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+ if (ap->state == ST_INIT && ap->flags & MOUNT_FLAG_REMOUNT)
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+ cache_readlock(mc);
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+ else
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+ cache_writelock(mc);
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me = cache_lookup_distinct(mc, name);
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if (!me) {
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cache_unlock(mc);
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@ -0,0 +1,43 @@
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autofs-5.1.9 - fix get parent multi-mount check in try_remount()
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From: Ian Kent <raven@themaw.net>
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In commit 635b90ecc (autofs-5.1.8 - fix mount tree startup reconnect)
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when getting the parent the check for a multi-mount should include a
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check for the root of the multi-mount as well since the root does not
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set its parent (it remains NULL).
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We could set the root parent to itself but that may have side effects
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because the convention has always been the parent is NULL for the
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multi-mount root.
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Reported-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
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Suggested-by: Roberto Bergantinos Corpas <rbergant@redhat.com>
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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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lib/mounts.c | 2 +-
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2 files changed, 2 insertions(+), 1 deletion(-)
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--- autofs-5.1.4.orig/CHANGELOG
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+++ autofs-5.1.4/CHANGELOG
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@@ -152,6 +152,7 @@
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- fix expire retry looping.
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- allow -null map in indirect maps.
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- fix multi-mount check.
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+- fix get parent multi-mount check in try_remount().
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xx/xx/2018 autofs-5.1.5
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- fix flag file permission.
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--- autofs-5.1.4.orig/lib/mounts.c
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+++ autofs-5.1.4/lib/mounts.c
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@@ -2878,7 +2878,7 @@ int try_remount(struct autofs_point *ap,
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}
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me->flags &= ~MOUNT_FLAG_DIR_CREATED;
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- mapent = IS_MM(me) ? MM_PARENT(me) : me;
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+ mapent = IS_MM(me) && !IS_MM_ROOT(me) ? MM_PARENT(me) : me;
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/* Direct or offset mount, key is full path */
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if (mapent->key[0] == '/') {
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if (!is_mounted(mapent->key, MNTS_REAL))
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15
autofs.spec
15
autofs.spec
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@ -8,7 +8,7 @@
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Summary: A tool for automatically mounting and unmounting filesystems
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Name: autofs
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Version: 5.1.4
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Release: 112%{?dist}
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Release: 113%{?dist}
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Epoch: 1
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License: GPLv2+
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Group: System Environment/Daemons
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@ -329,6 +329,9 @@ Patch326: autofs-5.1.8-fix-expire-retry-looping.patch
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Patch327: autofs-5.1.8-allow-null-map-in-indirect-maps.patch
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Patch328: autofs-5.1.8-fix-multi-mount-check.patch
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Patch329: autofs-5.1.9-fix-get-parent-multi-mount-check-in-try_remount.patch
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Patch330: autofs-5.1.9-fix-deadlock-in-remount.patch
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%if %{with_systemd}
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BuildRequires: systemd-units
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BuildRequires: systemd-devel
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@ -698,6 +701,9 @@ echo %{version}-%{release} > .version
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%patch327 -p1
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%patch328 -p1
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%patch329 -p1
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%patch330 -p1
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%build
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LDFLAGS=-Wl,-z,now
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%configure --disable-mount-locking --enable-ignore-busy --with-libtirpc --without-hesiod %{?systemd_configure_arg:}
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@ -792,6 +798,13 @@ fi
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%dir /etc/auto.master.d
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%changelog
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* Mon Dec 18 2023 Ian Kent <ikent@redhat.com> - 5.1.4-113
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- RHEL-18035 - SIGSEGV using hierarchical map entries on reload with
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autofs-5.1.4-109
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- fix get parent multi-mount check in try_remount().
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- fix deadlock in remount.
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- Resolves: RHEL-18035
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* Mon Sep 18 2023 Ian Kent <ikent@redhat.com> - 5.1.4-112
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- RHEL-7997 - multi mount detection fails for share with blank+dash
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causing SEGV crash
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