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From a6fec757c8a17f3a5b92fb766b0f2eeb3b1a208a Mon Sep 17 00:00:00 2001
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From: Giuseppe Scrivano <gscrivan@redhat.com>
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Date: Thu, 19 Dec 2019 19:06:00 +0100
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Subject: [PATCH] store: keep graph lock during Mount
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This solves a race condition where a mountpoint is created without the
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home mount being present.
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The cause is that another process could be calling the graph driver
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cleanup as part of store.Shutdown() causing the unmount of the
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driver home directory.
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The unmount could happen between the time the rlstore is retrieved and
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the actual mount, causing the driver mount to be done without a home
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mount below it.
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A third process then would re-create again the home mount, shadowing
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the previous mount.
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Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1757845
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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---
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store.go | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/store.go b/store.go
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index 65808b8a0..272153e51 100644
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--- a/vendor/github.com/containers/storage/store.go
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+++ b/vendor/github.com/containers/storage/store.go
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@@ -2479,6 +2479,10 @@ func (s *store) Mount(id, mountLabel string) (string, error) {
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if err != nil {
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return "", err
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}
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+
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+ s.graphLock.Lock()
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+ defer s.graphLock.Unlock()
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+
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rlstore.Lock()
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defer rlstore.Unlock()
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if modified, err := rlstore.Modified(); modified || err != nil {
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@@ -2486,6 +2490,18 @@ func (s *store) Mount(id, mountLabel string) (string, error) {
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return "", err
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}
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}
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+
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+ /* We need to make sure the home mount is present when the Mount is done. */
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+ if s.graphLock.TouchedSince(s.lastLoaded) {
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+ s.graphDriver = nil
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+ s.layerStore = nil
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+ s.graphDriver, err = s.getGraphDriver()
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+ if err != nil {
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+ return "", err
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+ }
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+ s.lastLoaded = time.Now()
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+ }
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+
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if rlstore.Exists(id) {
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options := drivers.MountOpts{
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MountLabel: mountLabel,
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