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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package linux
import (
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
)
const (
// As NGROUPS_MAX in include/uapi/linux/limits.h.
maxNGroups = 65536
)
// Getuid implements the Linux syscall getuid.
func Getuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
c := t.Credentials()
ruid := c.RealKUID.In(c.UserNamespace).OrOverflow()
return uintptr(ruid), nil, nil
}
// Geteuid implements the Linux syscall geteuid.
func Geteuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
c := t.Credentials()
euid := c.EffectiveKUID.In(c.UserNamespace).OrOverflow()
return uintptr(euid), nil, nil
}
// Getresuid implements the Linux syscall getresuid.
func Getresuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
ruidAddr := args[0].Pointer()
euidAddr := args[1].Pointer()
suidAddr := args[2].Pointer()
c := t.Credentials()
ruid := c.RealKUID.In(c.UserNamespace).OrOverflow()
euid := c.EffectiveKUID.In(c.UserNamespace).OrOverflow()
suid := c.SavedKUID.In(c.UserNamespace).OrOverflow()
if _, err := ruid.CopyOut(t, ruidAddr); err != nil {
return 0, nil, err
}
if _, err := euid.CopyOut(t, euidAddr); err != nil {
return 0, nil, err
}
if _, err := suid.CopyOut(t, suidAddr); err != nil {
return 0, nil, err
}
return 0, nil, nil
}
// Getgid implements the Linux syscall getgid.
func Getgid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
c := t.Credentials()
rgid := c.RealKGID.In(c.UserNamespace).OrOverflow()
return uintptr(rgid), nil, nil
}
// Getegid implements the Linux syscall getegid.
func Getegid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
c := t.Credentials()
egid := c.EffectiveKGID.In(c.UserNamespace).OrOverflow()
return uintptr(egid), nil, nil
}
// Getresgid implements the Linux syscall getresgid.
func Getresgid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
rgidAddr := args[0].Pointer()
egidAddr := args[1].Pointer()
sgidAddr := args[2].Pointer()
c := t.Credentials()
rgid := c.RealKGID.In(c.UserNamespace).OrOverflow()
egid := c.EffectiveKGID.In(c.UserNamespace).OrOverflow()
sgid := c.SavedKGID.In(c.UserNamespace).OrOverflow()
if _, err := rgid.CopyOut(t, rgidAddr); err != nil {
return 0, nil, err
}
if _, err := egid.CopyOut(t, egidAddr); err != nil {
return 0, nil, err
}
if _, err := sgid.CopyOut(t, sgidAddr); err != nil {
return 0, nil, err
}
return 0, nil, nil
}
// Setuid implements the Linux syscall setuid.
func Setuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
uid := auth.UID(args[0].Int())
return 0, nil, t.SetUID(uid)
}
// Setreuid implements the Linux syscall setreuid.
func Setreuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
ruid := auth.UID(args[0].Int())
euid := auth.UID(args[1].Int())
return 0, nil, t.SetREUID(ruid, euid)
}
// Setresuid implements the Linux syscall setreuid.
func Setresuid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
ruid := auth.UID(args[0].Int())
euid := auth.UID(args[1].Int())
suid := auth.UID(args[2].Int())
return 0, nil, t.SetRESUID(ruid, euid, suid)
}
// Setgid implements the Linux syscall setgid.
func Setgid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
gid := auth.GID(args[0].Int())
return 0, nil, t.SetGID(gid)
}
// Setregid implements the Linux syscall setregid.
func Setregid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
rgid := auth.GID(args[0].Int())
egid := auth.GID(args[1].Int())
return 0, nil, t.SetREGID(rgid, egid)
}
// Setresgid implements the Linux syscall setregid.
func Setresgid(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
rgid := auth.GID(args[0].Int())
egid := auth.GID(args[1].Int())
sgid := auth.GID(args[2].Int())
return 0, nil, t.SetRESGID(rgid, egid, sgid)
}
// Getgroups implements the Linux syscall getgroups.
func Getgroups(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
size := int(args[0].Int())
if size < 0 {
return 0, nil, linuxerr.EINVAL
}
kgids := t.Credentials().ExtraKGIDs
// "If size is zero, list is not modified, but the total number of
// supplementary group IDs for the process is returned." - getgroups(2)
if size == 0 {
return uintptr(len(kgids)), nil, nil
}
if size < len(kgids) {
return 0, nil, linuxerr.EINVAL
}
gids := make([]auth.GID, len(kgids))
for i, kgid := range kgids {
gids[i] = kgid.In(t.UserNamespace()).OrOverflow()
}
if _, err := auth.CopyGIDSliceOut(t, args[1].Pointer(), gids); err != nil {
return 0, nil, err
}
return uintptr(len(gids)), nil, nil
}
// Setgroups implements the Linux syscall setgroups.
func Setgroups(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
size := args[0].Int()
if size < 0 || size > maxNGroups {
return 0, nil, linuxerr.EINVAL
}
if size == 0 {
return 0, nil, t.SetExtraGIDs(nil)
}
gids := make([]auth.GID, size)
if _, err := auth.CopyGIDSliceIn(t, args[1].Pointer(), gids); err != nil {
return 0, nil, err
}
return 0, nil, t.SetExtraGIDs(gids)
}
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