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https://github.com/podman-container-tools/podman.git
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ac136b7999
Keep the selected subpath mounted while stat and copy use it so a shared volume cannot redirect the copy root with a symlink. Release the mount after each operation and cover source replacement in a regression test. Signed-off-by: pooyanazad <pooyan.azadparvar@gmail.com>
47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
//go:build !remote
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package libpod
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import (
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"errors"
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"os"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/require"
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"golang.org/x/sys/unix"
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)
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func TestSafeMountSubPathAfterReplacement(t *testing.T) {
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parent := t.TempDir()
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volumeRoot := filepath.Join(parent, "volume")
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subPath := filepath.Join(volumeRoot, "sub")
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outside := filepath.Join(parent, "outside")
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require.NoError(t, os.MkdirAll(subPath, 0o755))
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require.NoError(t, os.MkdirAll(outside, 0o755))
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require.NoError(t, os.WriteFile(filepath.Join(subPath, "probe"), []byte("inside"), 0o644))
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require.NoError(t, os.WriteFile(filepath.Join(outside, "probe"), []byte("outside"), 0o644))
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container := &Container{state: &ContainerState{RunDir: t.TempDir()}}
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mount, err := container.safeMountSubPath(volumeRoot, "sub")
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if errors.Is(err, unix.EPERM) {
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t.Skip("bind mounts are not permitted in this test environment")
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}
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require.NoError(t, err)
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defer mount.Close()
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root := mount.mountPoint
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require.NoError(t, os.Rename(subPath, filepath.Join(volumeRoot, "moved")))
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require.NoError(t, os.Symlink(outside, subPath))
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content, err := os.ReadFile(filepath.Join(root, "probe"))
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require.NoError(t, err)
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require.Equal(t, "inside", string(content))
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require.NoError(t, os.WriteFile(filepath.Join(root, "written"), []byte("x"), 0o644))
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content, err = os.ReadFile(filepath.Join(volumeRoot, "moved", "written"))
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require.NoError(t, err)
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require.Equal(t, "x", string(content))
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_, err = os.Stat(filepath.Join(outside, "written"))
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require.ErrorIs(t, err, os.ErrNotExist)
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}
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