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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package efi_test
import (
"os"
"path/filepath"
"strings"
"testing"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/bootloader/bootloadertest"
"github.com/snapcore/snapd/bootloader/efi"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/testutil"
)
type efiVarsSuite struct {
testutil.BaseTest
rootdir string
}
var _ = Suite(&efiVarsSuite{})
func TestBoot(t *testing.T) { TestingT(t) }
func (s *efiVarsSuite) SetUpTest(c *C) {
s.BaseTest.SetUpTest(c)
s.rootdir = c.MkDir()
dirs.SetRootDir(s.rootdir)
s.AddCleanup(func() { dirs.SetRootDir("") })
err := os.MkdirAll(filepath.Join(s.rootdir, "/sys/firmware/efi/efivars"), 0755)
c.Assert(err, IsNil)
efivarfsMount := `
38 24 0:32 / /sys/firmware/efi/efivars rw,nosuid,nodev,noexec,relatime shared:13 - efivarfs efivarfs rw
`
restore := osutil.MockMountInfo(strings.TrimSpace(efivarfsMount))
s.AddCleanup(restore)
}
func (s *efiVarsSuite) TestNoEFISystem(c *C) {
// no efivarfs
osutil.MockMountInfo("")
_, _, err := efi.ReadVarBytes("my-cool-efi-var")
c.Check(err, Equals, efi.ErrNoEFISystem)
_, _, err = efi.ReadVarString("my-cool-efi-var")
c.Check(err, Equals, efi.ErrNoEFISystem)
}
func (s *efiVarsSuite) TestSizeError(c *C) {
// mock the efi var file
varPath := filepath.Join(s.rootdir, "/sys/firmware/efi/efivars", "my-cool-efi-var")
err := os.WriteFile(varPath, []byte("\x06"), 0644)
c.Assert(err, IsNil)
_, _, err = efi.ReadVarBytes("my-cool-efi-var")
c.Check(err, ErrorMatches, `cannot read EFI var "my-cool-efi-var": unexpected size: 1`)
}
func (s *efiVarsSuite) TestReadVarBytes(c *C) {
// mock the efi var file
varPath := filepath.Join(s.rootdir, "/sys/firmware/efi/efivars", "my-cool-efi-var")
err := os.WriteFile(varPath, []byte("\x06\x00\x00\x00\x01"), 0644)
c.Assert(err, IsNil)
data, attr, err := efi.ReadVarBytes("my-cool-efi-var")
c.Assert(err, IsNil)
c.Check(attr, Equals, efi.VariableBootServiceAccess|efi.VariableRuntimeAccess)
c.Assert(string(data), Equals, "\x01")
}
func (s *efiVarsSuite) TestReadVarString(c *C) {
// mock the efi var file
varPath := filepath.Join(s.rootdir, "/sys/firmware/efi/efivars", "my-cool-efi-var")
err := os.WriteFile(varPath, []byte("\x06\x00\x00\x00A\x009\x00F\x005\x00C\x009\x004\x009\x00-\x00A\x00B\x008\x009\x00-\x005\x00B\x004\x007\x00-\x00A\x007\x00B\x00F\x00-\x005\x006\x00D\x00D\x002\x008\x00F\x009\x006\x00E\x006\x005\x00\x00\x00"), 0644)
c.Assert(err, IsNil)
data, attr, err := efi.ReadVarString("my-cool-efi-var")
c.Assert(err, IsNil)
c.Check(attr, Equals, efi.VariableBootServiceAccess|efi.VariableRuntimeAccess)
c.Assert(data, Equals, "A9F5C949-AB89-5B47-A7BF-56DD28F96E65")
}
func (s *efiVarsSuite) TestEmpty(c *C) {
// mock the efi var file
varPath := filepath.Join(s.rootdir, "/sys/firmware/efi/efivars", "my-cool-efi-var")
err := os.WriteFile(varPath, []byte("\x06\x00\x00\x00"), 0644)
c.Assert(err, IsNil)
b, _, err := efi.ReadVarBytes("my-cool-efi-var")
c.Assert(err, IsNil)
c.Check(b, HasLen, 0)
v, _, err := efi.ReadVarString("my-cool-efi-var")
c.Assert(err, IsNil)
c.Check(v, HasLen, 0)
}
func (s *efiVarsSuite) TestMockVars(c *C) {
restore := efi.MockVars(map[string][]byte{
"a": []byte("\x01"),
"b": []byte("\x02"),
}, map[string]efi.VariableAttr{
"b": efi.VariableNonVolatile | efi.VariableRuntimeAccess | efi.VariableBootServiceAccess,
})
defer restore()
b, attr, err := efi.ReadVarBytes("a")
c.Assert(err, IsNil)
c.Check(attr, Equals, efi.VariableBootServiceAccess|efi.VariableRuntimeAccess)
c.Assert(string(b), Equals, "\x01")
b, attr, err = efi.ReadVarBytes("b")
c.Assert(err, IsNil)
c.Check(attr, Equals, efi.VariableBootServiceAccess|efi.VariableRuntimeAccess|efi.VariableNonVolatile)
c.Assert(string(b), Equals, "\x02")
}
func (s *efiVarsSuite) TestMockStringVars(c *C) {
restore := efi.MockVars(map[string][]byte{
"a": bootloadertest.UTF16Bytes("foo-bar-baz"),
}, nil)
defer restore()
v, attr, err := efi.ReadVarString("a")
c.Assert(err, IsNil)
c.Check(attr, Equals, efi.VariableBootServiceAccess|efi.VariableRuntimeAccess)
c.Assert(v, Equals, "foo-bar-baz")
}
func (s *efiVarsSuite) TestMockVarsNoEFISystem(c *C) {
restore := efi.MockVars(nil, nil)
defer restore()
_, _, err := efi.ReadVarBytes("a")
c.Check(err, Equals, efi.ErrNoEFISystem)
}
func (s *efiVarsSuite) TestStringOddSize(c *C) {
restore := efi.MockVars(map[string][]byte{
"a": []byte("\x0a"),
}, nil)
defer restore()
_, _, err := efi.ReadVarString("a")
c.Check(err, ErrorMatches, `EFI var "a" is not a valid UTF16 string, it has an extra byte`)
}
|
