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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/compat.c
parent45a4a64ab485d5c3e76ee79163a24303bf5077fd (diff)
semctl(): move compat to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc/compat.c')
-rw-r--r--ipc/compat.c230
1 files changed, 33 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)
{