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-rw-r--r--pkg/sentry/fsimpl/verity/verity_test.go130
1 files changed, 105 insertions, 25 deletions
diff --git a/pkg/sentry/fsimpl/verity/verity_test.go b/pkg/sentry/fsimpl/verity/verity_test.go
index 9b5641092..8bcc14131 100644
--- a/pkg/sentry/fsimpl/verity/verity_test.go
+++ b/pkg/sentry/fsimpl/verity/verity_test.go
@@ -67,7 +67,7 @@ func newVerityRoot(ctx context.Context) (*vfs.VirtualFilesystem, vfs.VirtualDent
},
})
if err != nil {
- return nil, vfs.VirtualDentry{}, nil, fmt.Errorf("failed to create verity root mount: %v", err)
+ return nil, vfs.VirtualDentry{}, nil, fmt.Errorf("NewMountNamespace: %v", err)
}
root := mntns.Root()
return vfsObj, root, func() {
@@ -130,11 +130,11 @@ func corruptRandomBit(ctx context.Context, fd *vfs.FileDescription, size int) er
randomPos := int64(rand.Intn(size))
byteToModify := make([]byte, 1)
if _, err := fd.PRead(ctx, usermem.BytesIOSequence(byteToModify), randomPos, vfs.ReadOptions{}); err != nil {
- return fmt.Errorf("lowerFD.PRead failed: %v", err)
+ return fmt.Errorf("lowerFD.PRead: %v", err)
}
byteToModify[0] ^= 1
if _, err := fd.PWrite(ctx, usermem.BytesIOSequence(byteToModify), randomPos, vfs.WriteOptions{}); err != nil {
- return fmt.Errorf("lowerFD.PWrite failed: %v", err)
+ return fmt.Errorf("lowerFD.PWrite: %v", err)
}
return nil
}
@@ -145,13 +145,13 @@ func TestOpen(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj, root, cleanup, err := newVerityRoot(ctx)
if err != nil {
- t.Fatalf("Failed to create new verity root: %v", err)
+ t.Fatalf("newVerityRoot: %v", err)
}
defer cleanup()
filename := "verity-test-file"
if _, _, err := newFileFD(ctx, vfsObj, root, filename, 0644); err != nil {
- t.Fatalf("Failed to create new file fd: %v", err)
+ t.Fatalf("newFileFD: %v", err)
}
// Ensure that the corresponding Merkle tree file is created.
@@ -163,7 +163,7 @@ func TestOpen(t *testing.T) {
}, &vfs.OpenOptions{
Flags: linux.O_RDONLY,
}); err != nil {
- t.Errorf("Failed to open Merkle tree file %s: %v", merklePrefix+filename, err)
+ t.Errorf("OpenAt Merkle tree file %s: %v", merklePrefix+filename, err)
}
// Ensure the root merkle tree file is created.
@@ -174,7 +174,7 @@ func TestOpen(t *testing.T) {
}, &vfs.OpenOptions{
Flags: linux.O_RDONLY,
}); err != nil {
- t.Errorf("Failed to open root Merkle tree file %s: %v", merklePrefix+rootMerkleFilename, err)
+ t.Errorf("OpenAt root Merkle tree file %s: %v", merklePrefix+rootMerkleFilename, err)
}
}
@@ -184,27 +184,27 @@ func TestReadUntouchedFileSucceeds(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj, root, cleanup, err := newVerityRoot(ctx)
if err != nil {
- t.Fatalf("Failed to create new verity root: %v", err)
+ t.Fatalf("newVerityRoot: %v", err)
}
defer cleanup()
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, vfsObj, root, filename, 0644)
if err != nil {
- t.Fatalf("Failed to create new file fd: %v", err)
+ t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirm a normal read succeeds.
var args arch.SyscallArguments
args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
- t.Fatalf("Ioctl failed: %v", err)
+ t.Fatalf("Ioctl: %v", err)
}
buf := make([]byte, size)
n, err := fd.PRead(ctx, usermem.BytesIOSequence(buf), 0 /* offset */, vfs.ReadOptions{})
if err != nil && err != io.EOF {
- t.Fatalf("fd.PRead failed: %v", err)
+ t.Fatalf("fd.PRead: %v", err)
}
if n != int64(size) {
@@ -218,21 +218,21 @@ func TestReopenUntouchedFileSucceeds(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj, root, cleanup, err := newVerityRoot(ctx)
if err != nil {
- t.Fatalf("Failed to create new verity root: %v", err)
+ t.Fatalf("newVerityRoot: %v", err)
}
defer cleanup()
filename := "verity-test-file"
fd, _, err := newFileFD(ctx, vfsObj, root, filename, 0644)
if err != nil {
- t.Fatalf("Failed to create new file fd: %v", err)
+ t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file and confirms a normal read succeeds.
var args arch.SyscallArguments
args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
- t.Fatalf("Ioctl failed: %v", err)
+ t.Fatalf("Ioctl: %v", err)
}
// Ensure reopening the verity enabled file succeeds.
@@ -253,21 +253,21 @@ func TestModifiedFileFails(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj, root, cleanup, err := newVerityRoot(ctx)
if err != nil {
- t.Fatalf("Failed to create new verity root: %v", err)
+ t.Fatalf("newVerityRoot: %v", err)
}
defer cleanup()
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, vfsObj, root, filename, 0644)
if err != nil {
- t.Fatalf("Failed to create new file fd: %v", err)
+ t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
var args arch.SyscallArguments
args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
- t.Fatalf("Ioctl failed: %v", err)
+ t.Fatalf("Ioctl: %v", err)
}
// Open a new lowerFD that's read/writable.
@@ -280,11 +280,11 @@ func TestModifiedFileFails(t *testing.T) {
Flags: linux.O_RDWR,
})
if err != nil {
- t.Fatalf("Open lowerFD failed: %v", err)
+ t.Fatalf("OpenAt: %v", err)
}
if err := corruptRandomBit(ctx, lowerFD, size); err != nil {
- t.Fatalf("%v", err)
+ t.Fatalf("corruptRandomBit: %v", err)
}
// Confirm that read from the modified file fails.
@@ -300,21 +300,21 @@ func TestModifiedMerkleFails(t *testing.T) {
ctx := contexttest.Context(t)
vfsObj, root, cleanup, err := newVerityRoot(ctx)
if err != nil {
- t.Fatalf("Failed to create new verity root: %v", err)
+ t.Fatalf("newVerityRoot: %v", err)
}
defer cleanup()
filename := "verity-test-file"
fd, size, err := newFileFD(ctx, vfsObj, root, filename, 0644)
if err != nil {
- t.Fatalf("Failed to create new file fd: %v", err)
+ t.Fatalf("newFileFD: %v", err)
}
// Enable verity on the file.
var args arch.SyscallArguments
args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
- t.Fatalf("Ioctl failed: %v", err)
+ t.Fatalf("Ioctl: %v", err)
}
// Open a new lowerMerkleFD that's read/writable.
@@ -327,17 +327,17 @@ func TestModifiedMerkleFails(t *testing.T) {
Flags: linux.O_RDWR,
})
if err != nil {
- t.Fatalf("Open lowerMerkleFD failed: %v", err)
+ t.Fatalf("OpenAt: %v", err)
}
// Flip a random bit in the Merkle tree file.
stat, err := lowerMerkleFD.Stat(ctx, vfs.StatOptions{})
if err != nil {
- t.Fatalf("Failed to get lowerMerkleFD stat: %v", err)
+ t.Fatalf("stat: %v", err)
}
merkleSize := int(stat.Size)
if err := corruptRandomBit(ctx, lowerMerkleFD, merkleSize); err != nil {
- t.Fatalf("%v", err)
+ t.Fatalf("corruptRandomBit: %v", err)
}
// Confirm that read from a file with modified Merkle tree fails.
@@ -347,3 +347,83 @@ func TestModifiedMerkleFails(t *testing.T) {
t.Fatalf("fd.PRead succeeded with modified Merkle file")
}
}
+
+// TestModifiedParentMerkleFails ensures that open a verity enabled file in a
+// verity enabled directory fails if the hashes related to the target file in
+// the parent Merkle tree file is modified.
+func TestModifiedParentMerkleFails(t *testing.T) {
+ ctx := contexttest.Context(t)
+ vfsObj, root, cleanup, err := newVerityRoot(ctx)
+ if err != nil {
+ t.Fatalf("newVerityRoot: %v", err)
+ }
+ defer cleanup()
+
+ filename := "verity-test-file"
+ fd, _, err := newFileFD(ctx, vfsObj, root, filename, 0644)
+ if err != nil {
+ t.Fatalf("newFileFD: %v", err)
+ }
+
+ // Enable verity on the file.
+ var args arch.SyscallArguments
+ args[1] = arch.SyscallArgument{Value: linux.FS_IOC_ENABLE_VERITY}
+ if _, err := fd.Ioctl(ctx, nil /* uio */, args); err != nil {
+ t.Fatalf("Ioctl: %v", err)
+ }
+
+ // Enable verity on the parent directory.
+ parentFD, err := vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ }, &vfs.OpenOptions{
+ Flags: linux.O_RDONLY,
+ })
+ if err != nil {
+ t.Fatalf("OpenAt: %v", err)
+ }
+
+ if _, err := parentFD.Ioctl(ctx, nil /* uio */, args); err != nil {
+ t.Fatalf("Ioctl: %v", err)
+ }
+
+ // Open a new lowerMerkleFD that's read/writable.
+ parentLowerMerkleVD := fd.Impl().(*fileDescription).d.parent.lowerMerkleVD
+
+ parentLowerMerkleFD, err := vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
+ Root: parentLowerMerkleVD,
+ Start: parentLowerMerkleVD,
+ }, &vfs.OpenOptions{
+ Flags: linux.O_RDWR,
+ })
+ if err != nil {
+ t.Fatalf("OpenAt: %v", err)
+ }
+
+ // Flip a random bit in the parent Merkle tree file.
+ // This parent directory contains only one child, so any random
+ // modification in the parent Merkle tree should cause verification
+ // failure when opening the child file.
+ stat, err := parentLowerMerkleFD.Stat(ctx, vfs.StatOptions{})
+ if err != nil {
+ t.Fatalf("stat: %v", err)
+ }
+ parentMerkleSize := int(stat.Size)
+ if err := corruptRandomBit(ctx, parentLowerMerkleFD, parentMerkleSize); err != nil {
+ t.Fatalf("corruptRandomBit: %v", err)
+ }
+
+ parentLowerMerkleFD.DecRef(ctx)
+
+ // Ensure reopening the verity enabled file fails.
+ if _, err = vfsObj.OpenAt(ctx, auth.CredentialsFromContext(ctx), &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(filename),
+ }, &vfs.OpenOptions{
+ Flags: linux.O_RDONLY,
+ Mode: linux.ModeRegular,
+ }); err == nil {
+ t.Errorf("OpenAt file with modified parent Merkle succeeded")
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 22:06:08 +0000