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Merge pull request #2593 from mheon/scrub_tmpfs_links

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Ensure that tmpfs mounts do not have symlinks
This commit is contained in:
OpenShift Merge Robot
2019-03-11 17:56:51 -07:00
committed by GitHub
parent 1466c8a2f8 66a72d9283
commit dec36f2d0b
1 changed files with 13 additions and 0 deletions
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13
libpod/container_internal_linux.go
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@ -26,6 +26,7 @@ import (
"github.com/containers/libpod/pkg/resolvconf"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/storage/pkg/idtools"
"github.com/cyphar/filepath-securejoin"
"github.com/opencontainers/runc/libcontainer/user"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
@ -366,6 +367,18 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
// For private volumes any root propagation value should work.
rootPropagation := ""
for _, m := range mounts {
// We need to remove all symlinks from tmpfs mounts.
// Runc and other runtimes may choke on them.
// Easy solution: use securejoin to do a scoped evaluation of
// the links, then trim off the mount prefix.
if m.Type == "tmpfs" {
finalPath, err := securejoin.SecureJoin(c.state.Mountpoint, m.Destination)
if err != nil {
return nil, errors.Wrapf(err, "error resolving symlinks for mount destination %s", m.Destination)
}
trimmedPath := strings.TrimPrefix(finalPath, strings.TrimSuffix(c.state.Mountpoint, "/"))
m.Destination = trimmedPath
}
g.AddMount(m)
for _, opt := range m.Options {
switch opt {