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authorAl Viro <viro@zeniv.linux.org.uk>2017-07-09 10:03:23 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-15 20:46:44 -0400
commitc0ebccb6fa1e2c9c3377fa8136e6d8bc006fca64 (patch)
treeb4c5565819658fca6533ef779fec432ba3654b00 /ipc
parent45a4a64ab485d5c3e76ee79163a24303bf5077fd (diff)
download96b-common-c0ebccb6fa1e2c9c3377fa8136e6d8bc006fca64.tar.gz
semctl(): move compat to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/compat.c230
-rw-r--r--ipc/sem.c94
-rw-r--r--ipc/util.h6
3 files changed, 133 insertions, 197 deletions
diff --git a/ipc/compat.c b/ipc/compat.c
index c83099a3b265..3c25ca1e46c7 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -39,214 +39,55 @@ struct compat_msgbuf {
char mtext[1];
};
-struct compat_semid_ds {
- struct compat_ipc_perm sem_perm;
- compat_time_t sem_otime;
- compat_time_t sem_ctime;
- compat_uptr_t sem_base;
- compat_uptr_t sem_pending;
- compat_uptr_t sem_pending_last;
- compat_uptr_t undo;
- unsigned short sem_nsems;
-};
-
struct compat_ipc_kludge {
compat_uptr_t msgp;
compat_long_t msgtyp;
};
-static inline int __compat_ipc_parse_version(int *cmd)
-{
-#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
- int version = *cmd & IPC_64;
-
- /* this is tricky: architectures that have support for the old
- * ipc structures in 64 bit binaries need to have IPC_64 set
- * in cmd, the others need to have it cleared */
-#ifndef ipc_parse_version
- *cmd |= IPC_64;
-#else
- *cmd &= ~IPC_64;
-#endif
- return version;
-#else
- /* With the asm-generic APIs, we always use the 64-bit versions. */
- return IPC_64;
-#endif
-}
-
-static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
- struct compat_ipc64_perm __user *up64)
-{
- int err;
-
- err = __get_user(p64->uid, &up64->uid);
- err |= __get_user(p64->gid, &up64->gid);
- err |= __get_user(p64->mode, &up64->mode);
- return err;
-}
-
-static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
- struct compat_ipc_perm __user *up)
-{
- int err;
-
- err = __get_user(p->uid, &up->uid);
- err |= __get_user(p->gid, &up->gid);
- err |= __get_user(p->mode, &up->mode);
- return err;
-}
-
-static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
- struct compat_ipc64_perm __user *up64)
-{
- int err;
-
- err = __put_user(p64->key, &up64->key);
- err |= __put_user(p64->uid, &up64->uid);
- err |= __put_user(p64->gid, &up64->gid);
- err |= __put_user(p64->cuid, &up64->cuid);
- err |= __put_user(p64->cgid, &up64->cgid);
- err |= __put_user(p64->mode, &up64->mode);
- err |= __put_user(p64->seq, &up64->seq);
- return err;
-}
-
-static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
- struct compat_ipc_perm __user *uip)
-{
- int err;
- __compat_uid_t u;
- __compat_gid_t g;
-
- err = __put_user(p->key, &uip->key);
- SET_UID(u, p->uid);
- err |= __put_user(u, &uip->uid);
- SET_GID(g, p->gid);
- err |= __put_user(g, &uip->gid);
- SET_UID(u, p->cuid);
- err |= __put_user(u, &uip->cuid);
- SET_GID(g, p->cgid);
- err |= __put_user(g, &uip->cgid);
- err |= __put_user(p->mode, &uip->mode);
- err |= __put_user(p->seq, &uip->seq);
- return err;
-}
-
-static inline int get_compat_semid64_ds(struct semid64_ds *sem64,
- struct compat_semid64_ds __user *up64)
+int get_compat_ipc64_perm(struct ipc64_perm *to,
+ struct compat_ipc64_perm __user *from)
{
- if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
+ struct compat_ipc64_perm v;
+ if (copy_from_user(&v, from, sizeof(v)))
return -EFAULT;
- return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
+ to->uid = v.uid;
+ to->gid = v.gid;
+ to->mode = v.mode;
+ return 0;
}
-static inline int get_compat_semid_ds(struct semid64_ds *s,
- struct compat_semid_ds __user *up)
+int get_compat_ipc_perm(struct ipc64_perm *to,
+ struct compat_ipc_perm __user *from)
{
- if (!access_ok(VERIFY_READ, up, sizeof(*up)))
+ struct compat_ipc_perm v;
+ if (copy_from_user(&v, from, sizeof(v)))
return -EFAULT;
- return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
+ to->uid = v.uid;
+ to->gid = v.gid;
+ to->mode = v.mode;
+ return 0;
}
-static inline int put_compat_semid64_ds(struct semid64_ds *sem64,
- struct compat_semid64_ds __user *up64)
+void to_compat_ipc64_perm(struct compat_ipc64_perm *to, struct ipc64_perm *from)
{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
- return -EFAULT;
- err = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
- err |= __put_user(sem64->sem_otime, &up64->sem_otime);
- err |= __put_user(sem64->sem_ctime, &up64->sem_ctime);
- err |= __put_user(sem64->sem_nsems, &up64->sem_nsems);
- return err;
+ to->key = from->key;
+ to->uid = from->uid;
+ to->gid = from->gid;
+ to->cuid = from->cuid;
+ to->cgid = from->cgid;
+ to->mode = from->mode;
+ to->seq = from->seq;
}
-static inline int put_compat_semid_ds(struct semid64_ds *s,
- struct compat_semid_ds __user *up)
+void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from)
{
- int err;
-
- if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
- return -EFAULT;
- err = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
- err |= __put_user(s->sem_otime, &up->sem_otime);
- err |= __put_user(s->sem_ctime, &up->sem_ctime);
- err |= __put_user(s->sem_nsems, &up->sem_nsems);
- return err;
-}
-
-static long do_compat_semctl(int first, int second, int third, u32 pad)
-{
- unsigned long fourth;
- int err, err2;
- struct semid64_ds sem64;
- struct semid64_ds __user *up64;
- int version = __compat_ipc_parse_version(&third);
-
- memset(&sem64, 0, sizeof(sem64));
-
- if ((third & (~IPC_64)) == SETVAL)
-#ifdef __BIG_ENDIAN
- fourth = (unsigned long)pad << 32;
-#else
- fourth = pad;
-#endif
- else
- fourth = (unsigned long)compat_ptr(pad);
- switch (third & (~IPC_64)) {
- case IPC_INFO:
- case IPC_RMID:
- case SEM_INFO:
- case GETVAL:
- case GETPID:
- case GETNCNT:
- case GETZCNT:
- case GETALL:
- case SETVAL:
- case SETALL:
- err = sys_semctl(first, second, third, fourth);
- break;
-
- case IPC_STAT:
- case SEM_STAT:
- up64 = compat_alloc_user_space(sizeof(sem64));
- fourth = (unsigned long)up64;
- err = sys_semctl(first, second, third, fourth);
- if (err < 0)
- break;
- if (copy_from_user(&sem64, up64, sizeof(sem64)))
- err2 = -EFAULT;
- else if (version == IPC_64)
- err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad));
- else
- err2 = put_compat_semid_ds(&sem64, compat_ptr(pad));
- if (err2)
- err = -EFAULT;
- break;
-
- case IPC_SET:
- if (version == IPC_64)
- err = get_compat_semid64_ds(&sem64, compat_ptr(pad));
- else
- err = get_compat_semid_ds(&sem64, compat_ptr(pad));
-
- up64 = compat_alloc_user_space(sizeof(sem64));
- if (copy_to_user(up64, &sem64, sizeof(sem64)))
- err = -EFAULT;
- if (err)
- break;
-
- fourth = (unsigned long)up64;
- err = sys_semctl(first, second, third, fourth);
- break;
-
- default:
- err = -EINVAL;
- break;
- }
- return err;
+ to->key = from->key;
+ SET_UID(to->uid, from->uid);
+ SET_GID(to->gid, from->gid);
+ SET_UID(to->cuid, from->cuid);
+ SET_GID(to->cgid, from->cgid);
+ to->mode = from->mode;
+ to->seq = from->seq;
}
static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
@@ -291,7 +132,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
return -EINVAL;
if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
return -EFAULT;
- return do_compat_semctl(first, second, third, pad);
+ return compat_sys_semctl(first, second, third, pad);
case MSGSND: {
struct compat_msgbuf __user *up = compat_ptr(ptr);
@@ -352,11 +193,6 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
}
#endif
-COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
-{
- return do_compat_semctl(semid, semnum, cmd, arg);
-}
-
COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
compat_ssize_t, msgsz, int, msgflg)
{
diff --git a/ipc/sem.c b/ipc/sem.c
index c8029c6bef72..fcf064d6046a 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1617,6 +1617,100 @@ SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
}
}
+#ifdef CONFIG_COMPAT
+
+struct compat_semid_ds {
+ struct compat_ipc_perm sem_perm;
+ compat_time_t sem_otime;
+ compat_time_t sem_ctime;
+ compat_uptr_t sem_base;
+ compat_uptr_t sem_pending;
+ compat_uptr_t sem_pending_last;
+ compat_uptr_t undo;
+ unsigned short sem_nsems;
+};
+
+static int copy_compat_semid_from_user(struct semid64_ds *out, void __user *buf,
+ int version)
+{
+ memset(out, 0, sizeof(*out));
+ if (version == IPC_64) {
+ struct compat_semid64_ds *p = buf;
+ return get_compat_ipc64_perm(&out->sem_perm, &p->sem_perm);
+ } else {
+ struct compat_semid_ds *p = buf;
+ return get_compat_ipc_perm(&out->sem_perm, &p->sem_perm);
+ }
+}
+
+static int copy_compat_semid_to_user(void __user *buf, struct semid64_ds *in,
+ int version)
+{
+ if (version == IPC_64) {
+ struct compat_semid64_ds v;
+ memset(&v, 0, sizeof(v));
+ to_compat_ipc64_perm(&v.sem_perm, &in->sem_perm);
+ v.sem_otime = in->sem_otime;
+ v.sem_ctime = in->sem_ctime;
+ v.sem_nsems = in->sem_nsems;
+ return copy_to_user(buf, &v, sizeof(v));
+ } else {
+ struct compat_semid_ds v;
+ memset(&v, 0, sizeof(v));
+ to_compat_ipc_perm(&v.sem_perm, &in->sem_perm);
+ v.sem_otime = in->sem_otime;
+ v.sem_ctime = in->sem_ctime;
+ v.sem_nsems = in->sem_nsems;
+ return copy_to_user(buf, &v, sizeof(v));
+ }
+}
+
+COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
+{
+ void __user *p = compat_ptr(arg);
+ struct ipc_namespace *ns;
+ struct semid64_ds semid64;
+ int version = compat_ipc_parse_version(&cmd);
+ int err;
+
+ ns = current->nsproxy->ipc_ns;
+
+ if (semid < 0)
+ return -EINVAL;
+
+ switch (cmd & (~IPC_64)) {
+ case IPC_INFO:
+ case SEM_INFO:
+ return semctl_info(ns, semid, cmd, p);
+ case IPC_STAT:
+ case SEM_STAT:
+ err = semctl_stat(ns, semid, cmd, &semid64);
+ if (err < 0)
+ return err;
+ if (copy_compat_semid_to_user(p, &semid64, version))
+ err = -EFAULT;
+ return err;
+ case GETVAL:
+ case GETPID:
+ case GETNCNT:
+ case GETZCNT:
+ case GETALL:
+ case SETALL:
+ return semctl_main(ns, semid, semnum, cmd, p);
+ case SETVAL:
+ return semctl_setval(ns, semid, semnum, arg);
+ case IPC_SET:
+ if (copy_compat_semid_from_user(&semid64, p, version))
+ return -EFAULT;
+ /* fallthru */
+ case IPC_RMID:
+ return semctl_down(ns, semid, cmd, &semid64);
+ default:
+ return -EINVAL;
+ }
+}
+#endif
+
/* If the task doesn't already have a undo_list, then allocate one
* here. We guarantee there is only one thread using this undo list,
* and current is THE ONE
diff --git a/ipc/util.h b/ipc/util.h
index 3a3dfe137bee..c7b7a5ff1f0b 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -204,6 +204,12 @@ struct compat_ipc_perm {
unsigned short seq;
};
+void to_compat_ipc_perm(struct compat_ipc_perm *, struct ipc64_perm *);
+void to_compat_ipc64_perm(struct compat_ipc64_perm *, struct ipc64_perm *);
+int get_compat_ipc_perm(struct ipc64_perm *, struct compat_ipc_perm __user *);
+int get_compat_ipc64_perm(struct ipc64_perm *,
+ struct compat_ipc64_perm __user *);
+
static inline int compat_ipc_parse_version(int *cmd)
{
#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION