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semctl(): move compat to native

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-07-09 10:03:23 -04:00
parent 45a4a64ab4
commit c0ebccb6fa
3 changed files with 133 additions and 197 deletions
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94
ipc/sem.c
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@@ -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