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userns: user namespaces: convert several capable() calls
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CAP_IPC_OWNER and CAP_IPC_LOCK can be checked against current_user_ns(),
because the resource comes from current's own ipc namespace.

setuid/setgid are to uids in own namespace, so again checks can be against
current_user_ns().

Changelog:
	Jan 11: Use task_ns_capable() in place of sched_capable().
	Jan 11: Use nsown_capable() as suggested by Bastian Blank.
	Jan 11: Clarify (hopefully) some logic in futex and sched.c
	Feb 15: use ns_capable for ipc, not nsown_capable
	Feb 23: let copy_ipcs handle setting ipc_ns->user_ns
	Feb 23: pass ns down rather than taking it from current

[[email protected]: coding-style fixes]
Signed-off-by: Serge E. Hallyn <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>
Acked-by: David Howells <[email protected]>
Cc: James Morris <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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hallyn authored and torvalds committed Mar 24, 2011
1 parent b515498 commit b0e7759
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Showing 13 changed files with 75 additions and 45 deletions.
7 changes: 4 additions & 3 deletions include/linux/ipc_namespace.h
Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#include <linux/idr.h>
#include <linux/rwsem.h>
#include <linux/notifier.h>
#include <linux/nsproxy.h>

/*
* ipc namespace events
Expand Down Expand Up @@ -93,7 +94,7 @@ static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }

#if defined(CONFIG_IPC_NS)
extern struct ipc_namespace *copy_ipcs(unsigned long flags,
struct ipc_namespace *ns);
struct task_struct *tsk);
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
if (ns)
Expand All @@ -104,12 +105,12 @@ static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
extern void put_ipc_ns(struct ipc_namespace *ns);
#else
static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
struct ipc_namespace *ns)
struct task_struct *tsk)
{
if (flags & CLONE_NEWIPC)
return ERR_PTR(-EINVAL);

return ns;
return tsk->nsproxy->ipc_ns;
}

static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
Expand Down
8 changes: 4 additions & 4 deletions ipc/msg.c
Original file line number Diff line number Diff line change
Expand Up @@ -421,7 +421,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
return -EFAULT;
}

ipcp = ipcctl_pre_down(&msg_ids(ns), msqid, cmd,
ipcp = ipcctl_pre_down(ns, &msg_ids(ns), msqid, cmd,
&msqid64.msg_perm, msqid64.msg_qbytes);
if (IS_ERR(ipcp))
return PTR_ERR(ipcp);
Expand Down Expand Up @@ -539,7 +539,7 @@ SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
success_return = 0;
}
err = -EACCES;
if (ipcperms(&msq->q_perm, S_IRUGO))
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;

err = security_msg_queue_msgctl(msq, cmd);
Expand Down Expand Up @@ -664,7 +664,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
struct msg_sender s;

err = -EACCES;
if (ipcperms(&msq->q_perm, S_IWUGO))
if (ipcperms(ns, &msq->q_perm, S_IWUGO))
goto out_unlock_free;

err = security_msg_queue_msgsnd(msq, msg, msgflg);
Expand Down Expand Up @@ -774,7 +774,7 @@ long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
struct list_head *tmp;

msg = ERR_PTR(-EACCES);
if (ipcperms(&msq->q_perm, S_IRUGO))
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;

msg = ERR_PTR(-EAGAIN);
Expand Down
13 changes: 8 additions & 5 deletions ipc/namespace.c
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,8 @@

#include "util.h"

static struct ipc_namespace *create_ipc_ns(struct ipc_namespace *old_ns)
static struct ipc_namespace *create_ipc_ns(struct task_struct *tsk,
struct ipc_namespace *old_ns)
{
struct ipc_namespace *ns;
int err;
Expand Down Expand Up @@ -44,17 +45,19 @@ static struct ipc_namespace *create_ipc_ns(struct ipc_namespace *old_ns)
ipcns_notify(IPCNS_CREATED);
register_ipcns_notifier(ns);

ns->user_ns = old_ns->user_ns;
get_user_ns(ns->user_ns);
ns->user_ns = get_user_ns(task_cred_xxx(tsk, user)->user_ns);

return ns;
}

struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
struct ipc_namespace *copy_ipcs(unsigned long flags,
struct task_struct *tsk)
{
struct ipc_namespace *ns = tsk->nsproxy->ipc_ns;

if (!(flags & CLONE_NEWIPC))
return get_ipc_ns(ns);
return create_ipc_ns(ns);
return create_ipc_ns(tsk, ns);
}

/*
Expand Down
10 changes: 6 additions & 4 deletions ipc/sem.c
Original file line number Diff line number Diff line change
Expand Up @@ -817,7 +817,7 @@ static int semctl_nolock(struct ipc_namespace *ns, int semid,
}

err = -EACCES;
if (ipcperms (&sma->sem_perm, S_IRUGO))
if (ipcperms(ns, &sma->sem_perm, S_IRUGO))
goto out_unlock;

err = security_sem_semctl(sma, cmd);
Expand Down Expand Up @@ -862,7 +862,8 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
nsems = sma->sem_nsems;

err = -EACCES;
if (ipcperms (&sma->sem_perm, (cmd==SETVAL||cmd==SETALL)?S_IWUGO:S_IRUGO))
if (ipcperms(ns, &sma->sem_perm,
(cmd == SETVAL || cmd == SETALL) ? S_IWUGO : S_IRUGO))
goto out_unlock;

err = security_sem_semctl(sma, cmd);
Expand Down Expand Up @@ -1047,7 +1048,8 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
return -EFAULT;
}

ipcp = ipcctl_pre_down(&sem_ids(ns), semid, cmd, &semid64.sem_perm, 0);
ipcp = ipcctl_pre_down(ns, &sem_ids(ns), semid, cmd,
&semid64.sem_perm, 0);
if (IS_ERR(ipcp))
return PTR_ERR(ipcp);

Expand Down Expand Up @@ -1386,7 +1388,7 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
goto out_unlock_free;

error = -EACCES;
if (ipcperms(&sma->sem_perm, alter ? S_IWUGO : S_IRUGO))
if (ipcperms(ns, &sma->sem_perm, alter ? S_IWUGO : S_IRUGO))
goto out_unlock_free;

error = security_sem_semop(sma, sops, nsops, alter);
Expand Down
9 changes: 5 additions & 4 deletions ipc/shm.c
Original file line number Diff line number Diff line change
Expand Up @@ -623,7 +623,8 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
return -EFAULT;
}

ipcp = ipcctl_pre_down(&shm_ids(ns), shmid, cmd, &shmid64.shm_perm, 0);
ipcp = ipcctl_pre_down(ns, &shm_ids(ns), shmid, cmd,
&shmid64.shm_perm, 0);
if (IS_ERR(ipcp))
return PTR_ERR(ipcp);

Expand Down Expand Up @@ -737,7 +738,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
result = 0;
}
err = -EACCES;
if (ipcperms (&shp->shm_perm, S_IRUGO))
if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
goto out_unlock;
err = security_shm_shmctl(shp, cmd);
if (err)
Expand Down Expand Up @@ -773,7 +774,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)

audit_ipc_obj(&(shp->shm_perm));

if (!capable(CAP_IPC_LOCK)) {
if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
uid_t euid = current_euid();
err = -EPERM;
if (euid != shp->shm_perm.uid &&
Expand Down Expand Up @@ -888,7 +889,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
}

err = -EACCES;
if (ipcperms(&shp->shm_perm, acc_mode))
if (ipcperms(ns, &shp->shm_perm, acc_mode))
goto out_unlock;

err = security_shm_shmat(shp, shmaddr, shmflg);
Expand Down
26 changes: 16 additions & 10 deletions ipc/util.c
Original file line number Diff line number Diff line change
Expand Up @@ -329,12 +329,14 @@ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
*
* It is called with ipc_ids.rw_mutex and ipcp->lock held.
*/
static int ipc_check_perms(struct kern_ipc_perm *ipcp, struct ipc_ops *ops,
struct ipc_params *params)
static int ipc_check_perms(struct ipc_namespace *ns,
struct kern_ipc_perm *ipcp,
struct ipc_ops *ops,
struct ipc_params *params)
{
int err;

if (ipcperms(ipcp, params->flg))
if (ipcperms(ns, ipcp, params->flg))
err = -EACCES;
else {
err = ops->associate(ipcp, params->flg);
Expand Down Expand Up @@ -396,7 +398,7 @@ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
* ipc_check_perms returns the IPC id on
* success
*/
err = ipc_check_perms(ipcp, ops, params);
err = ipc_check_perms(ns, ipcp, ops, params);
}
ipc_unlock(ipcp);
}
Expand Down Expand Up @@ -610,10 +612,12 @@ void ipc_rcu_putref(void *ptr)
*
* Check user, group, other permissions for access
* to ipc resources. return 0 if allowed
*
* @flag will most probably be 0 or S_...UGO from <linux/stat.h>
*/

int ipcperms (struct kern_ipc_perm *ipcp, short flag)
{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flag)
{
uid_t euid = current_euid();
int requested_mode, granted_mode;

Expand All @@ -627,7 +631,7 @@ int ipcperms (struct kern_ipc_perm *ipcp, short flag)
granted_mode >>= 3;
/* is there some bit set in requested_mode but not in granted_mode? */
if ((requested_mode & ~granted_mode & 0007) &&
!capable(CAP_IPC_OWNER))
!ns_capable(ns->user_ns, CAP_IPC_OWNER))
return -1;

return security_ipc_permission(ipcp, flag);
Expand Down Expand Up @@ -765,6 +769,7 @@ void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)

/**
* ipcctl_pre_down - retrieve an ipc and check permissions for some IPC_XXX cmd
* @ids: the ipc namespace
* @ids: the table of ids where to look for the ipc
* @id: the id of the ipc to retrieve
* @cmd: the cmd to check
Expand All @@ -779,7 +784,8 @@ void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
* - returns the ipc with both ipc and rw_mutex locks held in case of success
* or an err-code without any lock held otherwise.
*/
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns,
struct ipc_ids *ids, int id, int cmd,
struct ipc64_perm *perm, int extra_perm)
{
struct kern_ipc_perm *ipcp;
Expand All @@ -799,8 +805,8 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
perm->gid, perm->mode);

euid = current_euid();
if (euid == ipcp->cuid ||
euid == ipcp->uid || capable(CAP_SYS_ADMIN))
if (euid == ipcp->cuid || euid == ipcp->uid ||
ns_capable(ns->user_ns, CAP_SYS_ADMIN))
return ipcp;

err = -EPERM;
Expand Down
5 changes: 3 additions & 2 deletions ipc/util.h
Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ int ipc_get_maxid(struct ipc_ids *);
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);

/* must be called with ipcp locked */
int ipcperms(struct kern_ipc_perm *ipcp, short flg);
int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);

/* for rare, potentially huge allocations.
* both function can sleep
Expand All @@ -126,7 +126,8 @@ struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns,
struct ipc_ids *ids, int id, int cmd,
struct ipc64_perm *perm, int extra_perm);

#ifndef __ARCH_WANT_IPC_PARSE_VERSION
Expand Down
11 changes: 10 additions & 1 deletion kernel/futex.c
Original file line number Diff line number Diff line change
Expand Up @@ -2418,10 +2418,19 @@ SYSCALL_DEFINE3(get_robust_list, int, pid,
goto err_unlock;
ret = -EPERM;
pcred = __task_cred(p);
/* If victim is in different user_ns, then uids are not
comparable, so we must have CAP_SYS_PTRACE */
if (cred->user->user_ns != pcred->user->user_ns) {
if (!ns_capable(pcred->user->user_ns, CAP_SYS_PTRACE))
goto err_unlock;
goto ok;
}
/* If victim is in same user_ns, then uids are comparable */
if (cred->euid != pcred->euid &&
cred->euid != pcred->uid &&
!capable(CAP_SYS_PTRACE))
!ns_capable(pcred->user->user_ns, CAP_SYS_PTRACE))
goto err_unlock;
ok:
head = p->robust_list;
rcu_read_unlock();
}
Expand Down
11 changes: 10 additions & 1 deletion kernel/futex_compat.c
Original file line number Diff line number Diff line change
Expand Up @@ -153,10 +153,19 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
goto err_unlock;
ret = -EPERM;
pcred = __task_cred(p);
/* If victim is in different user_ns, then uids are not
comparable, so we must have CAP_SYS_PTRACE */
if (cred->user->user_ns != pcred->user->user_ns) {
if (!ns_capable(pcred->user->user_ns, CAP_SYS_PTRACE))
goto err_unlock;
goto ok;
}
/* If victim is in same user_ns, then uids are comparable */
if (cred->euid != pcred->euid &&
cred->euid != pcred->uid &&
!capable(CAP_SYS_PTRACE))
!ns_capable(pcred->user->user_ns, CAP_SYS_PTRACE))
goto err_unlock;
ok:
head = p->compat_robust_list;
rcu_read_unlock();
}
Expand Down
2 changes: 1 addition & 1 deletion kernel/groups.c
Original file line number Diff line number Diff line change
Expand Up @@ -233,7 +233,7 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
struct group_info *group_info;
int retval;

if (!capable(CAP_SETGID))
if (!nsown_capable(CAP_SETGID))
return -EPERM;
if ((unsigned)gidsetsize > NGROUPS_MAX)
return -EINVAL;
Expand Down
7 changes: 1 addition & 6 deletions kernel/nsproxy.c
Original file line number Diff line number Diff line change
Expand Up @@ -75,16 +75,11 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
goto out_uts;
}

new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
new_nsp->ipc_ns = copy_ipcs(flags, tsk);
if (IS_ERR(new_nsp->ipc_ns)) {
err = PTR_ERR(new_nsp->ipc_ns);
goto out_ipc;
}
if (new_nsp->ipc_ns != tsk->nsproxy->ipc_ns) {
put_user_ns(new_nsp->ipc_ns->user_ns);
new_nsp->ipc_ns->user_ns = task_cred_xxx(tsk, user)->user_ns;
get_user_ns(new_nsp->ipc_ns->user_ns);
}

new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk));
if (IS_ERR(new_nsp->pid_ns)) {
Expand Down
9 changes: 6 additions & 3 deletions kernel/sched.c
Original file line number Diff line number Diff line change
Expand Up @@ -4892,8 +4892,11 @@ static bool check_same_owner(struct task_struct *p)

rcu_read_lock();
pcred = __task_cred(p);
match = (cred->euid == pcred->euid ||
cred->euid == pcred->uid);
if (cred->user->user_ns == pcred->user->user_ns)
match = (cred->euid == pcred->euid ||
cred->euid == pcred->uid);
else
match = false;
rcu_read_unlock();
return match;
}
Expand Down Expand Up @@ -5221,7 +5224,7 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
goto out_free_cpus_allowed;
}
retval = -EPERM;
if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
if (!check_same_owner(p) && !task_ns_capable(p, CAP_SYS_NICE))
goto out_unlock;

retval = security_task_setscheduler(p);
Expand Down
2 changes: 1 addition & 1 deletion kernel/uid16.c
Original file line number Diff line number Diff line change
Expand Up @@ -189,7 +189,7 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
struct group_info *group_info;
int retval;

if (!capable(CAP_SETGID))
if (!nsown_capable(CAP_SETGID))
return -EPERM;
if ((unsigned)gidsetsize > NGROUPS_MAX)
return -EINVAL;
Expand Down

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