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Message-ID: <bdf6ed62-b75c-1920-d5ce-ea08428d03d0@schaufler-ca.com>
Date: Fri, 23 Mar 2018 14:46:02 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>,
Linux Containers <containers@...ts.linux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
khlebnikov@...dex-team.ru, prakash.sangappa@...cle.com,
luto@...nel.org, akpm@...ux-foundation.org, oleg@...hat.com,
serge.hallyn@...ntu.com, esyr@...hat.com, jannh@...gle.com,
linux-security-module@...r.kernel.org,
Pavel Emelyanov <xemul@...nvz.org>,
Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>
Subject: Re: [REVIEW][PATCH 01/11] sem/security: Pass kern_ipc_perm not
sem_array into the sem security hooks
On 3/23/2018 12:16 PM, Eric W. Biederman wrote:
> All of the implementations of security hooks that take sem_array only
> access sem_perm the struct kern_ipc_perm member. This means the
> dependencies of the sem security hooks can be simplified by passing
> the kern_ipc_perm member of sem_array.
>
> Making this change will allow struct sem and struct sem_array
> to become private to ipc/sem.c.
>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> ---
> include/linux/lsm_hooks.h | 10 +++++-----
> include/linux/security.h | 21 ++++++++++-----------
> ipc/sem.c | 19 ++++++++-----------
> security/security.c | 10 +++++-----
> security/selinux/hooks.c | 28 ++++++++++++++--------------
> security/smack/smack_lsm.c | 22 +++++++++++-----------
> 6 files changed, 53 insertions(+), 57 deletions(-)
>
> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
> index 7161d8e7ee79..e4a94863a88c 100644
> --- a/include/linux/lsm_hooks.h
> +++ b/include/linux/lsm_hooks.h
> @@ -1592,11 +1592,11 @@ union security_list_options {
> int (*shm_shmat)(struct shmid_kernel *shp, char __user *shmaddr,
> int shmflg);
>
> - int (*sem_alloc_security)(struct sem_array *sma);
> - void (*sem_free_security)(struct sem_array *sma);
> - int (*sem_associate)(struct sem_array *sma, int semflg);
> - int (*sem_semctl)(struct sem_array *sma, int cmd);
> - int (*sem_semop)(struct sem_array *sma, struct sembuf *sops,
> + int (*sem_alloc_security)(struct kern_ipc_perm *sma);
> + void (*sem_free_security)(struct kern_ipc_perm *sma);
> + int (*sem_associate)(struct kern_ipc_perm *sma, int semflg);
> + int (*sem_semctl)(struct kern_ipc_perm *sma, int cmd);
> + int (*sem_semop)(struct kern_ipc_perm *sma, struct sembuf *sops,
> unsigned nsops, int alter);
>
> int (*netlink_send)(struct sock *sk, struct sk_buff *skb);
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 73f1ef625d40..fa7adac4b99a 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -36,7 +36,6 @@ struct linux_binprm;
> struct cred;
> struct rlimit;
> struct siginfo;
> -struct sem_array;
> struct sembuf;
> struct kern_ipc_perm;
> struct audit_context;
> @@ -368,11 +367,11 @@ void security_shm_free(struct shmid_kernel *shp);
> int security_shm_associate(struct shmid_kernel *shp, int shmflg);
> int security_shm_shmctl(struct shmid_kernel *shp, int cmd);
> int security_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg);
> -int security_sem_alloc(struct sem_array *sma);
> -void security_sem_free(struct sem_array *sma);
> -int security_sem_associate(struct sem_array *sma, int semflg);
> -int security_sem_semctl(struct sem_array *sma, int cmd);
> -int security_sem_semop(struct sem_array *sma, struct sembuf *sops,
> +int security_sem_alloc(struct kern_ipc_perm *sma);
> +void security_sem_free(struct kern_ipc_perm *sma);
> +int security_sem_associate(struct kern_ipc_perm *sma, int semflg);
> +int security_sem_semctl(struct kern_ipc_perm *sma, int cmd);
> +int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
> unsigned nsops, int alter);
> void security_d_instantiate(struct dentry *dentry, struct inode *inode);
> int security_getprocattr(struct task_struct *p, char *name, char **value);
> @@ -1103,25 +1102,25 @@ static inline int security_shm_shmat(struct shmid_kernel *shp,
> return 0;
> }
>
> -static inline int security_sem_alloc(struct sem_array *sma)
> +static inline int security_sem_alloc(struct kern_ipc_perm *sma)
> {
> return 0;
> }
>
> -static inline void security_sem_free(struct sem_array *sma)
> +static inline void security_sem_free(struct kern_ipc_perm *sma)
> { }
>
> -static inline int security_sem_associate(struct sem_array *sma, int semflg)
> +static inline int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
> {
> return 0;
> }
>
> -static inline int security_sem_semctl(struct sem_array *sma, int cmd)
> +static inline int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
> {
> return 0;
> }
>
> -static inline int security_sem_semop(struct sem_array *sma,
> +static inline int security_sem_semop(struct kern_ipc_perm *sma,
> struct sembuf *sops, unsigned nsops,
> int alter)
> {
> diff --git a/ipc/sem.c b/ipc/sem.c
> index a4af04979fd2..01f5c63670ae 100644
> --- a/ipc/sem.c
> +++ b/ipc/sem.c
> @@ -265,7 +265,7 @@ static void sem_rcu_free(struct rcu_head *head)
> struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
> struct sem_array *sma = container_of(p, struct sem_array, sem_perm);
>
> - security_sem_free(sma);
> + security_sem_free(&sma->sem_perm);
> kvfree(sma);
> }
>
> @@ -495,7 +495,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
> sma->sem_perm.key = key;
>
> sma->sem_perm.security = NULL;
> - retval = security_sem_alloc(sma);
> + retval = security_sem_alloc(&sma->sem_perm);
> if (retval) {
> kvfree(sma);
> return retval;
> @@ -535,10 +535,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
> */
> static inline int sem_security(struct kern_ipc_perm *ipcp, int semflg)
> {
> - struct sem_array *sma;
> -
> - sma = container_of(ipcp, struct sem_array, sem_perm);
> - return security_sem_associate(sma, semflg);
> + return security_sem_associate(ipcp, semflg);
> }
>
> /*
> @@ -1209,7 +1206,7 @@ static int semctl_stat(struct ipc_namespace *ns, int semid,
> if (ipcperms(ns, &sma->sem_perm, S_IRUGO))
> goto out_unlock;
>
> - err = security_sem_semctl(sma, cmd);
> + err = security_sem_semctl(&sma->sem_perm, cmd);
> if (err)
> goto out_unlock;
>
> @@ -1300,7 +1297,7 @@ static int semctl_setval(struct ipc_namespace *ns, int semid, int semnum,
> return -EACCES;
> }
>
> - err = security_sem_semctl(sma, SETVAL);
> + err = security_sem_semctl(&sma->sem_perm, SETVAL);
> if (err) {
> rcu_read_unlock();
> return -EACCES;
> @@ -1354,7 +1351,7 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
> if (ipcperms(ns, &sma->sem_perm, cmd == SETALL ? S_IWUGO : S_IRUGO))
> goto out_rcu_wakeup;
>
> - err = security_sem_semctl(sma, cmd);
> + err = security_sem_semctl(&sma->sem_perm, cmd);
> if (err)
> goto out_rcu_wakeup;
>
> @@ -1545,7 +1542,7 @@ static int semctl_down(struct ipc_namespace *ns, int semid,
>
> sma = container_of(ipcp, struct sem_array, sem_perm);
>
> - err = security_sem_semctl(sma, cmd);
> + err = security_sem_semctl(&sma->sem_perm, cmd);
> if (err)
> goto out_unlock1;
>
> @@ -1962,7 +1959,7 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops,
> goto out_free;
> }
>
> - error = security_sem_semop(sma, sops, nsops, alter);
> + error = security_sem_semop(&sma->sem_perm, sops, nsops, alter);
> if (error) {
> rcu_read_unlock();
> goto out_free;
> diff --git a/security/security.c b/security/security.c
> index 1cd8526cb0b7..d3b9aeb6b73b 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -1220,27 +1220,27 @@ int security_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmfl
> return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
> }
>
> -int security_sem_alloc(struct sem_array *sma)
> +int security_sem_alloc(struct kern_ipc_perm *sma)
> {
> return call_int_hook(sem_alloc_security, 0, sma);
> }
>
> -void security_sem_free(struct sem_array *sma)
> +void security_sem_free(struct kern_ipc_perm *sma)
> {
> call_void_hook(sem_free_security, sma);
> }
>
> -int security_sem_associate(struct sem_array *sma, int semflg)
> +int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
> {
> return call_int_hook(sem_associate, 0, sma, semflg);
> }
>
> -int security_sem_semctl(struct sem_array *sma, int cmd)
> +int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
> {
> return call_int_hook(sem_semctl, 0, sma, cmd);
> }
>
> -int security_sem_semop(struct sem_array *sma, struct sembuf *sops,
> +int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
> unsigned nsops, int alter)
> {
> return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 8644d864e3c1..cce994e9fc0a 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -5767,53 +5767,53 @@ static int selinux_shm_shmat(struct shmid_kernel *shp,
> }
>
> /* Semaphore security operations */
> -static int selinux_sem_alloc_security(struct sem_array *sma)
> +static int selinux_sem_alloc_security(struct kern_ipc_perm *sma)
> {
> struct ipc_security_struct *isec;
> struct common_audit_data ad;
> u32 sid = current_sid();
> int rc;
>
> - rc = ipc_alloc_security(&sma->sem_perm, SECCLASS_SEM);
> + rc = ipc_alloc_security(sma, SECCLASS_SEM);
> if (rc)
> return rc;
>
> - isec = sma->sem_perm.security;
> + isec = sma->security;
>
> ad.type = LSM_AUDIT_DATA_IPC;
> - ad.u.ipc_id = sma->sem_perm.key;
> + ad.u.ipc_id = sma->key;
>
> rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
> SEM__CREATE, &ad);
> if (rc) {
> - ipc_free_security(&sma->sem_perm);
> + ipc_free_security(sma);
> return rc;
> }
> return 0;
> }
>
> -static void selinux_sem_free_security(struct sem_array *sma)
> +static void selinux_sem_free_security(struct kern_ipc_perm *sma)
> {
> - ipc_free_security(&sma->sem_perm);
> + ipc_free_security(sma);
> }
>
> -static int selinux_sem_associate(struct sem_array *sma, int semflg)
> +static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg)
> {
> struct ipc_security_struct *isec;
> struct common_audit_data ad;
> u32 sid = current_sid();
>
> - isec = sma->sem_perm.security;
> + isec = sma->security;
>
> ad.type = LSM_AUDIT_DATA_IPC;
> - ad.u.ipc_id = sma->sem_perm.key;
> + ad.u.ipc_id = sma->key;
>
> return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
> SEM__ASSOCIATE, &ad);
> }
>
> /* Note, at this point, sma is locked down */
> -static int selinux_sem_semctl(struct sem_array *sma, int cmd)
> +static int selinux_sem_semctl(struct kern_ipc_perm *sma, int cmd)
> {
> int err;
> u32 perms;
> @@ -5851,11 +5851,11 @@ static int selinux_sem_semctl(struct sem_array *sma, int cmd)
> return 0;
> }
>
> - err = ipc_has_perm(&sma->sem_perm, perms);
> + err = ipc_has_perm(sma, perms);
> return err;
> }
>
> -static int selinux_sem_semop(struct sem_array *sma,
> +static int selinux_sem_semop(struct kern_ipc_perm *sma,
> struct sembuf *sops, unsigned nsops, int alter)
> {
> u32 perms;
> @@ -5865,7 +5865,7 @@ static int selinux_sem_semop(struct sem_array *sma,
> else
> perms = SEM__READ;
>
> - return ipc_has_perm(&sma->sem_perm, perms);
> + return ipc_has_perm(sma, perms);
> }
>
> static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 03fdecba93bb..0402b8c1aec1 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -3077,9 +3077,9 @@ static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
> *
> * Returns a pointer to the smack value
> */
> -static struct smack_known *smack_of_sem(struct sem_array *sma)
> +static struct smack_known *smack_of_sem(struct kern_ipc_perm *sma)
> {
> - return (struct smack_known *)sma->sem_perm.security;
> + return (struct smack_known *)sma->security;
> }
This function no longer makes sense and should be removed.
>
> /**
> @@ -3088,9 +3088,9 @@ static struct smack_known *smack_of_sem(struct sem_array *sma)
> *
> * Returns 0
> */
> -static int smack_sem_alloc_security(struct sem_array *sma)
> +static int smack_sem_alloc_security(struct kern_ipc_perm *sma)
> {
> - struct kern_ipc_perm *isp = &sma->sem_perm;
> + struct kern_ipc_perm *isp = sma;
> struct smack_known *skp = smk_of_current();
>
> isp->security = skp;
A kern_ipc_perm pointer is conventionally named isp in this code.
How about instead:
-static int smack_sem_alloc_security(struct sem_array *sma)
+static int smack_sem_alloc_security(struct kern_ipc_perm *isp)
{
- struct kern_ipc_perm *isp = &sma->sem_perm;
> @@ -3103,9 +3103,9 @@ static int smack_sem_alloc_security(struct sem_array *sma)
> *
> * Clears the blob pointer
> */
> -static void smack_sem_free_security(struct sem_array *sma)
> +static void smack_sem_free_security(struct kern_ipc_perm *sma)
> {
> - struct kern_ipc_perm *isp = &sma->sem_perm;
> + struct kern_ipc_perm *isp = sma;
-static void smack_sem_free_security(struct sem_array *sma)
+static void smack_sem_free_security(struct kern_ipc_perm *isp)
{
- struct kern_ipc_perm *isp = &sma->sem_perm;
>
> isp->security = NULL;
> }
> @@ -3117,7 +3117,7 @@ static void smack_sem_free_security(struct sem_array *sma)
> *
> * Returns 0 if current has the requested access, error code otherwise
> */
> -static int smk_curacc_sem(struct sem_array *sma, int access)
> +static int smk_curacc_sem(struct kern_ipc_perm *sma, int access)
-static int smk_curacc_sem(struct sem_array *sma, int access)
+static int smk_curacc_sem(struct kern_ipc_perm *isp, int access)
> {
> struct smack_known *ssp = smack_of_sem(sma);
struct smack_known *ssp = smack_of_ipc(isp);
> struct smk_audit_info ad;
> @@ -3125,7 +3125,7 @@ static int smk_curacc_sem(struct sem_array *sma, int access)
>
> #ifdef CONFIG_AUDIT
> smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
> - ad.a.u.ipc_id = sma->sem_perm.id;
> + ad.a.u.ipc_id = sma->id;
- ad.a.u.ipc_id = isp->sem_perm.id;
+ ad.a.u.ipc_id = isp->id;
> #endif
> rc = smk_curacc(ssp, access, &ad);
> rc = smk_bu_current("sem", ssp, access, rc);
> @@ -3139,7 +3139,7 @@ static int smk_curacc_sem(struct sem_array *sma, int access)
> *
> * Returns 0 if current has the requested access, error code otherwise
> */
> -static int smack_sem_associate(struct sem_array *sma, int semflg)
> +static int smack_sem_associate(struct kern_ipc_perm *sma, int semflg)
+static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg)
and related adjustments following.
> {
> int may;
>
> @@ -3154,7 +3154,7 @@ static int smack_sem_associate(struct sem_array *sma, int semflg)
> *
> * Returns 0 if current has the requested access, error code otherwise
> */
> -static int smack_sem_semctl(struct sem_array *sma, int cmd)
> +static int smack_sem_semctl(struct kern_ipc_perm *sma, int cmd)
+static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd)
and related adjustments following.
> {
> int may;
>
> @@ -3198,7 +3198,7 @@ static int smack_sem_semctl(struct sem_array *sma, int cmd)
> *
> * Returns 0 if access is allowed, error code otherwise
> */
> -static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
> +static int smack_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
> unsigned nsops, int alter)
> {
> return smk_curacc_sem(sma, MAY_READWRITE);
+static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
unsigned nsops, int alter)
{
- return smk_curacc_sem(sma, MAY_READWRITE);
+ return smk_curacc_sem(isp, MAY_READWRITE);
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