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new 'no-dereference' mount option

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Add a new `no-dereference` mount option supported by crun 1.11+ to
re-create/copy a symlink if it's the source of a mount.  By default the
kernel will resolve the symlink on the host and mount the target.
As reported in #20098, there are use cases where the symlink structure
must be preserved by all means.

Fixes: #20098
Fixes: issues.redhat.com/browse/RUN-1935
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
This commit is contained in:
Valentin Rothberg
2023-10-09 14:08:00 +02:00
parent 7dfbc72769
commit e40d70cecc
10 changed files with 105 additions and 10 deletions
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7
pkg/util/mountOpts.go
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@ -28,7 +28,7 @@ type defaultMountOptions struct {
// The sourcePath variable, if not empty, contains a bind mount source.
func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string, error) {
var (
foundWrite, foundSize, foundProp, foundMode, foundExec, foundSuid, foundDev, foundCopyUp, foundBind, foundZ, foundU, foundOverlay, foundIdmap, foundCopy, foundNoSwap bool
foundWrite, foundSize, foundProp, foundMode, foundExec, foundSuid, foundDev, foundCopyUp, foundBind, foundZ, foundU, foundOverlay, foundIdmap, foundCopy, foundNoSwap, foundNoDereference bool
)
newOptions := make([]string, 0, len(options))
@ -148,6 +148,11 @@ func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string
foundNoSwap = true
newOptions = append(newOptions, opt)
continue
case "no-dereference":
if foundNoDereference {
return nil, fmt.Errorf("the 'no-dereference' option can only be set once: %w", ErrDupeMntOption)
}
foundNoDereference = true
case define.TypeBind, "rbind":
if isTmpfs {
return nil, fmt.Errorf("the 'bind' and 'rbind' options are not allowed with tmpfs mounts: %w", ErrBadMntOption)