diff options
Diffstat (limited to 'libpod/container_internal.go')
| -rw-r--r-- | libpod/container_internal.go | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/libpod/container_internal.go b/libpod/container_internal.go index 78ec09f29..216bbe669 100644 --- a/libpod/container_internal.go +++ b/libpod/container_internal.go @@ -1383,18 +1383,34 @@ func (c *Container) mountNamedVolume(v *ContainerNamedVolume, mountpoint string) } if vol.state.NeedsCopyUp { logrus.Debugf("Copying up contents from container %s to volume %s", c.ID(), vol.Name()) + + // Set NeedsCopyUp to false immediately, so we don't try this + // again when there are already files copied. + vol.state.NeedsCopyUp = false + if err := vol.save(); err != nil { + return nil, err + } + + // If the volume is not empty, we should not copy up. + volMount := vol.MountPoint() + contents, err := ioutil.ReadDir(volMount) + if err != nil { + return nil, errors.Wrapf(err, "error listing contents of volume %s mountpoint when copying up from container %s", vol.Name(), c.ID()) + } + if len(contents) > 0 { + // The volume is not empty. It was likely modified + // outside of Podman. For safety, let's not copy up into + // it. Fixes CVE-2020-1726. + return vol, nil + } + srcDir, err := securejoin.SecureJoin(mountpoint, v.Dest) if err != nil { return nil, errors.Wrapf(err, "error calculating destination path to copy up container %s volume %s", c.ID(), vol.Name()) } - if err := c.copyWithTarFromImage(srcDir, vol.MountPoint()); err != nil && !os.IsNotExist(err) { + if err := c.copyWithTarFromImage(srcDir, volMount); err != nil && !os.IsNotExist(err) { return nil, errors.Wrapf(err, "error copying content from container %s into volume %s", c.ID(), vol.Name()) } - - vol.state.NeedsCopyUp = false - if err := vol.save(); err != nil { - return nil, err - } } return vol, nil } |