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-rw-r--r--runsc/cmd/capability.go6
-rw-r--r--runsc/cmd/cmd.go1
-rw-r--r--runsc/sandbox/BUILD1
-rw-r--r--runsc/sandbox/sandbox.go7
-rw-r--r--runsc/specutils/namespace.go22
-rw-r--r--runsc/test/testutil/BUILD1
-rw-r--r--runsc/test/testutil/testutil.go11
7 files changed, 24 insertions, 25 deletions
diff --git a/runsc/cmd/capability.go b/runsc/cmd/capability.go
index affbb7ce3..0b18c5481 100644
--- a/runsc/cmd/capability.go
+++ b/runsc/cmd/capability.go
@@ -60,7 +60,11 @@ func applyCaps(caps *specs.LinuxCapabilities) error {
newCaps.Set(c, set...)
}
- return newCaps.Apply(capability.CAPS | capability.BOUNDS | capability.AMBS)
+ if err := newCaps.Apply(capability.CAPS | capability.BOUNDS | capability.AMBS); err != nil {
+ return err
+ }
+ log.Infof("Capabilities applied: %+v", newCaps)
+ return nil
}
func getCaps(which capability.CapType, caps *specs.LinuxCapabilities) []string {
diff --git a/runsc/cmd/cmd.go b/runsc/cmd/cmd.go
index 44ebd7165..2937ae1c4 100644
--- a/runsc/cmd/cmd.go
+++ b/runsc/cmd/cmd.go
@@ -85,7 +85,6 @@ func setCapsAndCallSelf(args []string, caps *specs.LinuxCapabilities) error {
return err
}
- log.Infof("Capabilities applied: %+v", caps)
log.Infof("Execve %q again, bye!", binPath)
syscall.Exec(binPath, args, []string{})
panic("unreachable")
diff --git a/runsc/sandbox/BUILD b/runsc/sandbox/BUILD
index 7ae19ff35..09965dcc0 100644
--- a/runsc/sandbox/BUILD
+++ b/runsc/sandbox/BUILD
@@ -25,6 +25,7 @@ go_library(
"//runsc/specutils",
"@com_github_cenkalti_backoff//:go_default_library",
"@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+ "@com_github_syndtr_gocapability//capability:go_default_library",
"@com_github_vishvananda_netlink//:go_default_library",
],
)
diff --git a/runsc/sandbox/sandbox.go b/runsc/sandbox/sandbox.go
index ef85f175f..d288be1d2 100644
--- a/runsc/sandbox/sandbox.go
+++ b/runsc/sandbox/sandbox.go
@@ -26,6 +26,7 @@ import (
"github.com/cenkalti/backoff"
specs "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/syndtr/gocapability/capability"
"gvisor.googlesource.com/gvisor/pkg/control/client"
"gvisor.googlesource.com/gvisor/pkg/control/server"
"gvisor.googlesource.com/gvisor/pkg/log"
@@ -415,7 +416,7 @@ func (s *Sandbox) createSandboxProcess(spec *specs.Spec, conf *boot.Config, bund
// as user nobody.
if conf.TestOnlyAllowRunAsCurrentUserWithoutChroot {
log.Warningf("Running sandbox in test mode as current user (uid=%d gid=%d). This is only safe in tests!", os.Getuid(), os.Getgid())
- } else if specutils.CanSetUIDGID() {
+ } else if specutils.HasCapabilities(capability.CAP_SETUID, capability.CAP_SETGID) {
// Map nobody in the new namespace to nobody in the parent namespace.
const nobody = 65534
cmd.SysProcAttr.UidMappings = []syscall.SysProcIDMap{{
@@ -442,7 +443,7 @@ func (s *Sandbox) createSandboxProcess(spec *specs.Spec, conf *boot.Config, bund
// bind-mount the executable inside it.
if conf.TestOnlyAllowRunAsCurrentUserWithoutChroot {
log.Warningf("Running sandbox in test mode without chroot. This is only safe in tests!")
- } else if specutils.HasCapSysAdmin() {
+ } else if specutils.HasCapabilities(capability.CAP_SYS_ADMIN, capability.CAP_SYS_CHROOT) {
log.Infof("Sandbox will be started in minimal chroot")
chroot, err := setUpChroot()
if err != nil {
@@ -453,7 +454,7 @@ func (s *Sandbox) createSandboxProcess(spec *specs.Spec, conf *boot.Config, bund
cmd.Args[0] = "/runsc"
cmd.Path = "/runsc"
} else {
- return fmt.Errorf("can't run sandbox process in minimal chroot since we don't have CAP_SYS_ADMIN")
+ return fmt.Errorf("can't run sandbox process in minimal chroot since we don't have CAP_SYS_ADMIN and CAP_SYS_CHROOT")
}
}
diff --git a/runsc/specutils/namespace.go b/runsc/specutils/namespace.go
index 48a199a77..00293d45b 100644
--- a/runsc/specutils/namespace.go
+++ b/runsc/specutils/namespace.go
@@ -204,8 +204,8 @@ func SetUIDGIDMappings(cmd *exec.Cmd, s *specs.Spec) {
}
}
-// CanSetUIDGID returns true if the user has SETUID and SETGID capabilities.
-func CanSetUIDGID() bool {
+// HasCapabilities returns true if the user has all capabilties in 'cs'.
+func HasCapabilities(cs ...capability.Cap) bool {
caps, err := capability.NewPid2(os.Getpid())
if err != nil {
return false
@@ -213,18 +213,10 @@ func CanSetUIDGID() bool {
if err := caps.Load(); err != nil {
return false
}
- return caps.Get(capability.EFFECTIVE, capability.CAP_SETUID) &&
- caps.Get(capability.EFFECTIVE, capability.CAP_SETGID)
-}
-
-// HasCapSysAdmin returns true if the user has CAP_SYS_ADMIN capability.
-func HasCapSysAdmin() bool {
- caps, err := capability.NewPid2(os.Getpid())
- if err != nil {
- return false
- }
- if err := caps.Load(); err != nil {
- return false
+ for _, c := range cs {
+ if !caps.Get(capability.EFFECTIVE, c) {
+ return false
+ }
}
- return caps.Get(capability.EFFECTIVE, capability.CAP_SYS_ADMIN)
+ return true
}
diff --git a/runsc/test/testutil/BUILD b/runsc/test/testutil/BUILD
index 03ab3c4ac..ca91e07ff 100644
--- a/runsc/test/testutil/BUILD
+++ b/runsc/test/testutil/BUILD
@@ -18,5 +18,6 @@ go_library(
"//runsc/specutils",
"@com_github_cenkalti_backoff//:go_default_library",
"@com_github_opencontainers_runtime-spec//specs-go:go_default_library",
+ "@com_github_syndtr_gocapability//capability:go_default_library",
],
)
diff --git a/runsc/test/testutil/testutil.go b/runsc/test/testutil/testutil.go
index 37927f395..706db74a7 100644
--- a/runsc/test/testutil/testutil.go
+++ b/runsc/test/testutil/testutil.go
@@ -32,6 +32,7 @@ import (
"github.com/cenkalti/backoff"
specs "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/syndtr/gocapability/capability"
"gvisor.googlesource.com/gvisor/runsc/boot"
"gvisor.googlesource.com/gvisor/runsc/specutils"
)
@@ -234,12 +235,12 @@ func WaitForHTTP(port int, timeout time.Duration) error {
return Poll(cb, timeout)
}
-// RunAsRoot ensures the test runs with CAP_SYS_ADMIN. If need it will create
-// a new user namespace and reexecute the test as root inside of the namespace.
-// This functionr returns when it's running as root. If it needs to create
-// another process, it will exit from there and not return.
+// RunAsRoot ensures the test runs with CAP_SYS_ADMIN and CAP_SYS_CHROOT. If
+// need it will create a new user namespace and reexecute the test as root
+// inside of the namespace. This functionr returns when it's running as root. If
+// it needs to create another process, it will exit from there and not return.
func RunAsRoot() {
- if specutils.HasCapSysAdmin() {
+ if specutils.HasCapabilities(capability.CAP_SYS_ADMIN, capability.CAP_SYS_CHROOT) {
return
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 14:41:10 +0000