top: parse ps(1) args correctly

The arguments of ps(1) should be shlexed.

Fixes: #12452
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

libpod/container_top_linux.go

@@ -4,6 +4,7 @@ package libpod
 
 import (
 	"bufio"
+	"fmt"
 	"os"
 	"strconv"
 	"strings"
@@ -11,6 +12,7 @@ import (
 	"github.com/containers/podman/v3/libpod/define"
 	"github.com/containers/podman/v3/pkg/rootless"
 	"github.com/containers/psgo"
+	"github.com/google/shlex"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -51,7 +53,21 @@ func (c *Container) Top(descriptors []string) ([]string, error) {
 		return nil, psgoErr
 	}
 
-	output, err = c.execPS(descriptors)
+	// Note that the descriptors to ps(1) must be shlexed (see #12452).
+	psDescriptors := []string{}
+	for _, d := range descriptors {
+		shSplit, err := shlex.Split(d)
+		if err != nil {
+			return nil, fmt.Errorf("parsing ps args: %v", err)
+		}
+		for _, s := range shSplit {
+			if s != "" {
+				psDescriptors = append(psDescriptors, s)
+			}
+		}
+	}
+
+	output, err = c.execPS(psDescriptors)
 	if err != nil {
 		return nil, errors.Wrapf(err, "error executing ps(1) in the container")
 	}

test/e2e/top_test.go

@@ -101,6 +101,11 @@ var _ = Describe("Podman top", func() {
 		result.WaitWithDefaultTimeout()
 		Expect(result).Should(Exit(0))
 		Expect(len(result.OutputToStringArray())).To(BeNumerically(">", 1))
+
+		result = podmanTest.Podman([]string{"top", session.OutputToString(), "ax -o args"})
+		result.WaitWithDefaultTimeout()
+		Expect(result).Should(Exit(0))
+		Expect(result.OutputToStringArray()).To(Equal([]string{"COMMAND", "top -d 2"}))
 	})
 
 	It("podman top with comma-separated options", func() {