userns: Convert setting and getting uid and gid system calls to use kuid and kgid
Convert setregid, setgid, setreuid, setuid, setresuid, getresuid, setresgid, getresgid, setfsuid, setfsgid, getuid, geteuid, getgid, getegid, waitpid, waitid, wait4. Convert userspace uids and gids into kuids and kgids before being placed on struct cred. Convert struct cred kuids and kgids into userspace uids and gids when returning them. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
parent
18815a1808
commit
a29c33f4e5
4 changed files with 178 additions and 86 deletions
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@ -1214,7 +1214,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
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unsigned long state;
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int retval, status, traced;
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pid_t pid = task_pid_vnr(p);
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uid_t uid = __task_cred(p)->uid;
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uid_t uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
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struct siginfo __user *infop;
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if (!likely(wo->wo_flags & WEXITED))
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@ -1427,7 +1427,7 @@ static int wait_task_stopped(struct wait_opts *wo,
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if (!unlikely(wo->wo_flags & WNOWAIT))
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*p_code = 0;
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uid = task_uid(p);
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uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
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unlock_sig:
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spin_unlock_irq(&p->sighand->siglock);
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if (!exit_code)
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@ -1500,7 +1500,7 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
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}
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if (!unlikely(wo->wo_flags & WNOWAIT))
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p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
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uid = task_uid(p);
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uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
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spin_unlock_irq(&p->sighand->siglock);
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pid = task_pid_vnr(p);
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216
kernel/sys.c
216
kernel/sys.c
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@ -555,9 +555,19 @@ void ctrl_alt_del(void)
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*/
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SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kgid_t krgid, kegid;
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krgid = make_kgid(ns, rgid);
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kegid = make_kgid(ns, egid);
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if ((rgid != (gid_t) -1) && !gid_valid(krgid))
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return -EINVAL;
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if ((egid != (gid_t) -1) && !gid_valid(kegid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -566,25 +576,25 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
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retval = -EPERM;
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if (rgid != (gid_t) -1) {
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if (old->gid == rgid ||
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old->egid == rgid ||
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if (gid_eq(old->gid, krgid) ||
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gid_eq(old->egid, krgid) ||
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nsown_capable(CAP_SETGID))
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new->gid = rgid;
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new->gid = krgid;
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else
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goto error;
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}
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if (egid != (gid_t) -1) {
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if (old->gid == egid ||
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old->egid == egid ||
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old->sgid == egid ||
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if (gid_eq(old->gid, kegid) ||
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gid_eq(old->egid, kegid) ||
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gid_eq(old->sgid, kegid) ||
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nsown_capable(CAP_SETGID))
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new->egid = egid;
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new->egid = kegid;
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else
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goto error;
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}
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if (rgid != (gid_t) -1 ||
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(egid != (gid_t) -1 && egid != old->gid))
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(egid != (gid_t) -1 && !gid_eq(kegid, old->gid)))
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new->sgid = new->egid;
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new->fsgid = new->egid;
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@ -602,9 +612,15 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
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*/
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SYSCALL_DEFINE1(setgid, gid_t, gid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kgid_t kgid;
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kgid = make_kgid(ns, gid);
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if (!gid_valid(kgid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -613,9 +629,9 @@ SYSCALL_DEFINE1(setgid, gid_t, gid)
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retval = -EPERM;
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if (nsown_capable(CAP_SETGID))
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new->gid = new->egid = new->sgid = new->fsgid = gid;
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else if (gid == old->gid || gid == old->sgid)
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new->egid = new->fsgid = gid;
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new->gid = new->egid = new->sgid = new->fsgid = kgid;
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else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
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new->egid = new->fsgid = kgid;
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else
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goto error;
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@ -672,9 +688,19 @@ static int set_user(struct cred *new)
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*/
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SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kuid_t kruid, keuid;
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kruid = make_kuid(ns, ruid);
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keuid = make_kuid(ns, euid);
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if ((ruid != (uid_t) -1) && !uid_valid(kruid))
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return -EINVAL;
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if ((euid != (uid_t) -1) && !uid_valid(keuid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -683,29 +709,29 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
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retval = -EPERM;
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if (ruid != (uid_t) -1) {
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new->uid = ruid;
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if (old->uid != ruid &&
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old->euid != ruid &&
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new->uid = kruid;
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if (!uid_eq(old->uid, kruid) &&
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!uid_eq(old->euid, kruid) &&
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!nsown_capable(CAP_SETUID))
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goto error;
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}
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if (euid != (uid_t) -1) {
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new->euid = euid;
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if (old->uid != euid &&
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old->euid != euid &&
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old->suid != euid &&
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new->euid = keuid;
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if (!uid_eq(old->uid, keuid) &&
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!uid_eq(old->euid, keuid) &&
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!uid_eq(old->suid, keuid) &&
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!nsown_capable(CAP_SETUID))
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goto error;
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}
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if (new->uid != old->uid) {
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if (!uid_eq(new->uid, old->uid)) {
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retval = set_user(new);
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if (retval < 0)
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goto error;
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}
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if (ruid != (uid_t) -1 ||
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(euid != (uid_t) -1 && euid != old->uid))
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(euid != (uid_t) -1 && !uid_eq(keuid, old->uid)))
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new->suid = new->euid;
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new->fsuid = new->euid;
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@ -733,9 +759,15 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
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*/
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SYSCALL_DEFINE1(setuid, uid_t, uid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kuid_t kuid;
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kuid = make_kuid(ns, uid);
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if (!uid_valid(kuid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -744,17 +776,17 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
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retval = -EPERM;
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if (nsown_capable(CAP_SETUID)) {
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new->suid = new->uid = uid;
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if (uid != old->uid) {
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new->suid = new->uid = kuid;
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if (!uid_eq(kuid, old->uid)) {
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retval = set_user(new);
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if (retval < 0)
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goto error;
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}
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} else if (uid != old->uid && uid != new->suid) {
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} else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) {
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goto error;
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}
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new->fsuid = new->euid = uid;
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new->fsuid = new->euid = kuid;
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retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
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if (retval < 0)
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@ -774,9 +806,24 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
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*/
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SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kuid_t kruid, keuid, ksuid;
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kruid = make_kuid(ns, ruid);
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keuid = make_kuid(ns, euid);
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ksuid = make_kuid(ns, suid);
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if ((ruid != (uid_t) -1) && !uid_valid(kruid))
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return -EINVAL;
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if ((euid != (uid_t) -1) && !uid_valid(keuid))
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return -EINVAL;
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if ((suid != (uid_t) -1) && !uid_valid(ksuid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -786,29 +833,29 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
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retval = -EPERM;
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if (!nsown_capable(CAP_SETUID)) {
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if (ruid != (uid_t) -1 && ruid != old->uid &&
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ruid != old->euid && ruid != old->suid)
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if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) &&
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!uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
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goto error;
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if (euid != (uid_t) -1 && euid != old->uid &&
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euid != old->euid && euid != old->suid)
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if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) &&
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!uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid))
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goto error;
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if (suid != (uid_t) -1 && suid != old->uid &&
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suid != old->euid && suid != old->suid)
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if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) &&
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!uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid))
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goto error;
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}
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if (ruid != (uid_t) -1) {
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new->uid = ruid;
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if (ruid != old->uid) {
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new->uid = kruid;
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if (!uid_eq(kruid, old->uid)) {
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retval = set_user(new);
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if (retval < 0)
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goto error;
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}
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}
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if (euid != (uid_t) -1)
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new->euid = euid;
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new->euid = keuid;
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if (suid != (uid_t) -1)
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new->suid = suid;
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new->suid = ksuid;
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new->fsuid = new->euid;
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retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
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@ -822,14 +869,19 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
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return retval;
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}
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SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid)
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SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
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{
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const struct cred *cred = current_cred();
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int retval;
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uid_t ruid, euid, suid;
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if (!(retval = put_user(cred->uid, ruid)) &&
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!(retval = put_user(cred->euid, euid)))
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retval = put_user(cred->suid, suid);
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ruid = from_kuid_munged(cred->user_ns, cred->uid);
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euid = from_kuid_munged(cred->user_ns, cred->euid);
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suid = from_kuid_munged(cred->user_ns, cred->suid);
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if (!(retval = put_user(ruid, ruidp)) &&
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!(retval = put_user(euid, euidp)))
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retval = put_user(suid, suidp);
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return retval;
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}
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@ -839,9 +891,22 @@ SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __u
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*/
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SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
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{
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struct user_namespace *ns = current_user_ns();
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const struct cred *old;
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struct cred *new;
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int retval;
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kgid_t krgid, kegid, ksgid;
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krgid = make_kgid(ns, rgid);
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kegid = make_kgid(ns, egid);
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ksgid = make_kgid(ns, sgid);
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if ((rgid != (gid_t) -1) && !gid_valid(krgid))
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return -EINVAL;
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if ((egid != (gid_t) -1) && !gid_valid(kegid))
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return -EINVAL;
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if ((sgid != (gid_t) -1) && !gid_valid(ksgid))
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return -EINVAL;
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new = prepare_creds();
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if (!new)
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@ -850,23 +915,23 @@ SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
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retval = -EPERM;
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if (!nsown_capable(CAP_SETGID)) {
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if (rgid != (gid_t) -1 && rgid != old->gid &&
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rgid != old->egid && rgid != old->sgid)
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if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) &&
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!gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
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goto error;
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if (egid != (gid_t) -1 && egid != old->gid &&
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egid != old->egid && egid != old->sgid)
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if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) &&
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!gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid))
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goto error;
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if (sgid != (gid_t) -1 && sgid != old->gid &&
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sgid != old->egid && sgid != old->sgid)
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if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) &&
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!gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid))
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goto error;
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}
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if (rgid != (gid_t) -1)
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new->gid = rgid;
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new->gid = krgid;
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if (egid != (gid_t) -1)
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new->egid = egid;
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new->egid = kegid;
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if (sgid != (gid_t) -1)
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new->sgid = sgid;
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new->sgid = ksgid;
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new->fsgid = new->egid;
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return commit_creds(new);
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@ -876,14 +941,19 @@ SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
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return retval;
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}
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SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid)
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SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
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{
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const struct cred *cred = current_cred();
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int retval;
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gid_t rgid, egid, sgid;
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if (!(retval = put_user(cred->gid, rgid)) &&
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!(retval = put_user(cred->egid, egid)))
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retval = put_user(cred->sgid, sgid);
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rgid = from_kgid_munged(cred->user_ns, cred->gid);
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egid = from_kgid_munged(cred->user_ns, cred->egid);
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sgid = from_kgid_munged(cred->user_ns, cred->sgid);
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if (!(retval = put_user(rgid, rgidp)) &&
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!(retval = put_user(egid, egidp)))
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retval = put_user(sgid, sgidp);
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return retval;
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}
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@ -900,18 +970,24 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
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const struct cred *old;
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struct cred *new;
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uid_t old_fsuid;
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kuid_t kuid;
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old = current_cred();
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old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);
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kuid = make_kuid(old->user_ns, uid);
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if (!uid_valid(kuid))
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return old_fsuid;
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new = prepare_creds();
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if (!new)
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return current_fsuid();
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old = current_cred();
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old_fsuid = old->fsuid;
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return old_fsuid;
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if (uid == old->uid || uid == old->euid ||
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uid == old->suid || uid == old->fsuid ||
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if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) ||
|
||||
uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
|
||||
nsown_capable(CAP_SETUID)) {
|
||||
if (uid != old_fsuid) {
|
||||
new->fsuid = uid;
|
||||
if (!uid_eq(kuid, old->fsuid)) {
|
||||
new->fsuid = kuid;
|
||||
if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
|
||||
goto change_okay;
|
||||
}
|
||||
|
|
@ -933,18 +1009,24 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
|
|||
const struct cred *old;
|
||||
struct cred *new;
|
||||
gid_t old_fsgid;
|
||||
kgid_t kgid;
|
||||
|
||||
old = current_cred();
|
||||
old_fsgid = from_kgid_munged(old->user_ns, old->fsgid);
|
||||
|
||||
kgid = make_kgid(old->user_ns, gid);
|
||||
if (!gid_valid(kgid))
|
||||
return old_fsgid;
|
||||
|
||||
new = prepare_creds();
|
||||
if (!new)
|
||||
return current_fsgid();
|
||||
old = current_cred();
|
||||
old_fsgid = old->fsgid;
|
||||
return old_fsgid;
|
||||
|
||||
if (gid == old->gid || gid == old->egid ||
|
||||
gid == old->sgid || gid == old->fsgid ||
|
||||
if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) ||
|
||||
gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
|
||||
nsown_capable(CAP_SETGID)) {
|
||||
if (gid != old_fsgid) {
|
||||
new->fsgid = gid;
|
||||
if (!gid_eq(kgid, old->fsgid)) {
|
||||
new->fsgid = kgid;
|
||||
goto change_okay;
|
||||
}
|
||||
}
|
||||
|
|
@ -1503,10 +1585,10 @@ static int check_prlimit_permission(struct task_struct *task)
|
|||
if (cred->user_ns == tcred->user_ns &&
|
||||
(cred->uid == tcred->euid &&
|
||||
cred->uid == tcred->suid &&
|
||||
cred->uid == tcred->uid &&
|
||||
cred->uid == tcred->uid &&
|
||||
cred->gid == tcred->egid &&
|
||||
cred->gid == tcred->sgid &&
|
||||
cred->gid == tcred->gid))
|
||||
cred->gid == tcred->gid))
|
||||
return 0;
|
||||
if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -1427,25 +1427,25 @@ SYSCALL_DEFINE0(getppid)
|
|||
SYSCALL_DEFINE0(getuid)
|
||||
{
|
||||
/* Only we change this so SMP safe */
|
||||
return current_uid();
|
||||
return from_kuid_munged(current_user_ns(), current_uid());
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(geteuid)
|
||||
{
|
||||
/* Only we change this so SMP safe */
|
||||
return current_euid();
|
||||
return from_kuid_munged(current_user_ns(), current_euid());
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(getgid)
|
||||
{
|
||||
/* Only we change this so SMP safe */
|
||||
return current_gid();
|
||||
return from_kgid_munged(current_user_ns(), current_gid());
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(getegid)
|
||||
{
|
||||
/* Only we change this so SMP safe */
|
||||
return current_egid();
|
||||
return from_kgid_munged(current_user_ns(), current_egid());
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -81,14 +81,19 @@ SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
|
|||
return ret;
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
|
||||
SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
|
||||
{
|
||||
const struct cred *cred = current_cred();
|
||||
int retval;
|
||||
old_uid_t ruid, euid, suid;
|
||||
|
||||
if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
|
||||
!(retval = put_user(high2lowuid(cred->euid), euid)))
|
||||
retval = put_user(high2lowuid(cred->suid), suid);
|
||||
ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
|
||||
euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
|
||||
suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
|
||||
|
||||
if (!(retval = put_user(ruid, ruidp)) &&
|
||||
!(retval = put_user(euid, euidp)))
|
||||
retval = put_user(suid, suidp);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
|
@ -103,14 +108,19 @@ SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
|
|||
}
|
||||
|
||||
|
||||
SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
|
||||
SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
|
||||
{
|
||||
const struct cred *cred = current_cred();
|
||||
int retval;
|
||||
old_gid_t rgid, egid, sgid;
|
||||
|
||||
if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
|
||||
!(retval = put_user(high2lowgid(cred->egid), egid)))
|
||||
retval = put_user(high2lowgid(cred->sgid), sgid);
|
||||
rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
|
||||
egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
|
||||
sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
|
||||
|
||||
if (!(retval = put_user(rgid, rgidp)) &&
|
||||
!(retval = put_user(egid, egidp)))
|
||||
retval = put_user(sgid, sgidp);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
|
@ -221,20 +231,20 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
|
|||
|
||||
SYSCALL_DEFINE0(getuid16)
|
||||
{
|
||||
return high2lowuid(current_uid());
|
||||
return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(geteuid16)
|
||||
{
|
||||
return high2lowuid(current_euid());
|
||||
return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(getgid16)
|
||||
{
|
||||
return high2lowgid(current_gid());
|
||||
return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
|
||||
}
|
||||
|
||||
SYSCALL_DEFINE0(getegid16)
|
||||
{
|
||||
return high2lowgid(current_egid());
|
||||
return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue