linux32.c

LINUX 2.6.17.4的源码

        compat_time_t   msg_ctime;
        u32 wwait;
        u32 rwait;
        unsigned short msg_cbytes;
        unsigned short msg_qnum;
        unsigned short msg_qbytes;
        compat_ipc_pid_t msg_lspid;
        compat_ipc_pid_t msg_lrpid;
};

struct msqid64_ds32 {
	struct ipc64_perm32 msg_perm;
	compat_time_t msg_stime;
	unsigned int __unused1;
	compat_time_t msg_rtime;
	unsigned int __unused2;
	compat_time_t msg_ctime;
	unsigned int __unused3;
	unsigned int msg_cbytes;
	unsigned int msg_qnum;
	unsigned int msg_qbytes;
	compat_pid_t msg_lspid;
	compat_pid_t msg_lrpid;
	unsigned int __unused4;
	unsigned int __unused5;
};

struct shmid_ds32 {
        struct ipc_perm32       shm_perm;
        int                     shm_segsz;
        compat_time_t		shm_atime;
        compat_time_t		shm_dtime;
        compat_time_t		shm_ctime;
        compat_ipc_pid_t    shm_cpid;
        compat_ipc_pid_t    shm_lpid;
        unsigned short          shm_nattch;
};

struct shmid64_ds32 {
	struct ipc64_perm32	shm_perm;
	compat_size_t		shm_segsz;
	compat_time_t		shm_atime;
	compat_time_t		shm_dtime;
	compat_time_t shm_ctime;
	compat_pid_t shm_cpid;
	compat_pid_t shm_lpid;
	unsigned int shm_nattch;
	unsigned int __unused1;
	unsigned int __unused2;
};

struct ipc_kludge32 {
	u32 msgp;
	s32 msgtyp;
};

static int
do_sys32_semctl(int first, int second, int third, void __user *uptr)
{
	union semun fourth;
	u32 pad;
	int err, err2;
	struct semid64_ds s;
	mm_segment_t old_fs;

	if (!uptr)
		return -EINVAL;
	err = -EFAULT;
	if (get_user (pad, (u32 __user *)uptr))
		return err;
	if ((third & ~IPC_64) == SETVAL)
		fourth.val = (int)pad;
	else
		fourth.__pad = (void __user *)A(pad);
	switch (third & ~IPC_64) {
	case IPC_INFO:
	case IPC_RMID:
	case IPC_SET:
	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:
		fourth.__pad = (struct semid64_ds __user *)&s;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_semctl(first, second, third | IPC_64, fourth);
		set_fs(old_fs);

		if (third & IPC_64) {
			struct semid64_ds32 __user *usp64 = (struct semid64_ds32 __user *) A(pad);

			if (!access_ok(VERIFY_WRITE, usp64, sizeof(*usp64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s.sem_perm.key, &usp64->sem_perm.key);
			err2 |= __put_user(s.sem_perm.uid, &usp64->sem_perm.uid);
			err2 |= __put_user(s.sem_perm.gid, &usp64->sem_perm.gid);
			err2 |= __put_user(s.sem_perm.cuid, &usp64->sem_perm.cuid);
			err2 |= __put_user(s.sem_perm.cgid, &usp64->sem_perm.cgid);
			err2 |= __put_user(s.sem_perm.mode, &usp64->sem_perm.mode);
			err2 |= __put_user(s.sem_perm.seq, &usp64->sem_perm.seq);
			err2 |= __put_user(s.sem_otime, &usp64->sem_otime);
			err2 |= __put_user(s.sem_ctime, &usp64->sem_ctime);
			err2 |= __put_user(s.sem_nsems, &usp64->sem_nsems);
		} else {
			struct semid_ds32 __user *usp32 = (struct semid_ds32 __user *) A(pad);

			if (!access_ok(VERIFY_WRITE, usp32, sizeof(*usp32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s.sem_perm.key, &usp32->sem_perm.key);
			err2 |= __put_user(s.sem_perm.uid, &usp32->sem_perm.uid);
			err2 |= __put_user(s.sem_perm.gid, &usp32->sem_perm.gid);
			err2 |= __put_user(s.sem_perm.cuid, &usp32->sem_perm.cuid);
			err2 |= __put_user(s.sem_perm.cgid, &usp32->sem_perm.cgid);
			err2 |= __put_user(s.sem_perm.mode, &usp32->sem_perm.mode);
			err2 |= __put_user(s.sem_perm.seq, &usp32->sem_perm.seq);
			err2 |= __put_user(s.sem_otime, &usp32->sem_otime);
			err2 |= __put_user(s.sem_ctime, &usp32->sem_ctime);
			err2 |= __put_user(s.sem_nsems, &usp32->sem_nsems);
		}
		if (err2)
			err = -EFAULT;
		break;

	default:
		err = - EINVAL;
		break;
	}

	return err;
}

static int
do_sys32_msgsnd (int first, int second, int third, void __user *uptr)
{
	struct msgbuf32 __user *up = (struct msgbuf32 __user *)uptr;
	struct msgbuf *p;
	mm_segment_t old_fs;
	int err;

	if (second < 0)
		return -EINVAL;
	p = kmalloc (second + sizeof (struct msgbuf)
				    + 4, GFP_USER);
	if (!p)
		return -ENOMEM;
	err = get_user (p->mtype, &up->mtype);
	if (err)
		goto out;
	err |= __copy_from_user (p->mtext, &up->mtext, second);
	if (err)
		goto out;
	old_fs = get_fs ();
	set_fs (KERNEL_DS);
	err = sys_msgsnd (first, (struct msgbuf __user *)p, second, third);
	set_fs (old_fs);
out:
	kfree (p);

	return err;
}

static int
do_sys32_msgrcv (int first, int second, int msgtyp, int third,
		 int version, void __user *uptr)
{
	struct msgbuf32 __user *up;
	struct msgbuf *p;
	mm_segment_t old_fs;
	int err;

	if (!version) {
		struct ipc_kludge32 __user *uipck = (struct ipc_kludge32 __user *)uptr;
		struct ipc_kludge32 ipck;

		err = -EINVAL;
		if (!uptr)
			goto out;
		err = -EFAULT;
		if (copy_from_user (&ipck, uipck, sizeof (struct ipc_kludge32)))
			goto out;
		uptr = (void __user *)AA(ipck.msgp);
		msgtyp = ipck.msgtyp;
	}

	if (second < 0)
		return -EINVAL;
	err = -ENOMEM;
	p = kmalloc (second + sizeof (struct msgbuf) + 4, GFP_USER);
	if (!p)
		goto out;
	old_fs = get_fs ();
	set_fs (KERNEL_DS);
	err = sys_msgrcv (first, (struct msgbuf __user *)p, second + 4, msgtyp, third);
	set_fs (old_fs);
	if (err < 0)
		goto free_then_out;
	up = (struct msgbuf32 __user *)uptr;
	if (put_user (p->mtype, &up->mtype) ||
	    __copy_to_user (&up->mtext, p->mtext, err))
		err = -EFAULT;
free_then_out:
	kfree (p);
out:
	return err;
}

static int
do_sys32_msgctl (int first, int second, void __user *uptr)
{
	int err = -EINVAL, err2;
	struct msqid64_ds m;
	struct msqid_ds32 __user *up32 = (struct msqid_ds32 __user *)uptr;
	struct msqid64_ds32 __user *up64 = (struct msqid64_ds32 __user *)uptr;
	mm_segment_t old_fs;

	switch (second & ~IPC_64) {
	case IPC_INFO:
	case IPC_RMID:
	case MSG_INFO:
		err = sys_msgctl (first, second, (struct msqid_ds __user *)uptr);
		break;

	case IPC_SET:
		if (second & IPC_64) {
			if (!access_ok(VERIFY_READ, up64, sizeof(*up64))) {
				err = -EFAULT;
				break;
			}
			err = __get_user(m.msg_perm.uid, &up64->msg_perm.uid);
			err |= __get_user(m.msg_perm.gid, &up64->msg_perm.gid);
			err |= __get_user(m.msg_perm.mode, &up64->msg_perm.mode);
			err |= __get_user(m.msg_qbytes, &up64->msg_qbytes);
		} else {
			if (!access_ok(VERIFY_READ, up32, sizeof(*up32))) {
				err = -EFAULT;
				break;
			}
			err = __get_user(m.msg_perm.uid, &up32->msg_perm.uid);
			err |= __get_user(m.msg_perm.gid, &up32->msg_perm.gid);
			err |= __get_user(m.msg_perm.mode, &up32->msg_perm.mode);
			err |= __get_user(m.msg_qbytes, &up32->msg_qbytes);
		}
		if (err)
			break;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_msgctl(first, second | IPC_64, (struct msqid_ds __user *)&m);
		set_fs(old_fs);
		break;

	case IPC_STAT:
	case MSG_STAT:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_msgctl(first, second | IPC_64, (struct msqid_ds __user *)&m);
		set_fs(old_fs);
		if (second & IPC_64) {
			if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(m.msg_perm.key, &up64->msg_perm.key);
			err2 |= __put_user(m.msg_perm.uid, &up64->msg_perm.uid);
			err2 |= __put_user(m.msg_perm.gid, &up64->msg_perm.gid);
			err2 |= __put_user(m.msg_perm.cuid, &up64->msg_perm.cuid);
			err2 |= __put_user(m.msg_perm.cgid, &up64->msg_perm.cgid);
			err2 |= __put_user(m.msg_perm.mode, &up64->msg_perm.mode);
			err2 |= __put_user(m.msg_perm.seq, &up64->msg_perm.seq);
			err2 |= __put_user(m.msg_stime, &up64->msg_stime);
			err2 |= __put_user(m.msg_rtime, &up64->msg_rtime);
			err2 |= __put_user(m.msg_ctime, &up64->msg_ctime);
			err2 |= __put_user(m.msg_cbytes, &up64->msg_cbytes);
			err2 |= __put_user(m.msg_qnum, &up64->msg_qnum);
			err2 |= __put_user(m.msg_qbytes, &up64->msg_qbytes);
			err2 |= __put_user(m.msg_lspid, &up64->msg_lspid);
			err2 |= __put_user(m.msg_lrpid, &up64->msg_lrpid);
			if (err2)
				err = -EFAULT;
		} else {
			if (!access_ok(VERIFY_WRITE, up32, sizeof(*up32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(m.msg_perm.key, &up32->msg_perm.key);
			err2 |= __put_user(m.msg_perm.uid, &up32->msg_perm.uid);
			err2 |= __put_user(m.msg_perm.gid, &up32->msg_perm.gid);
			err2 |= __put_user(m.msg_perm.cuid, &up32->msg_perm.cuid);
			err2 |= __put_user(m.msg_perm.cgid, &up32->msg_perm.cgid);
			err2 |= __put_user(m.msg_perm.mode, &up32->msg_perm.mode);
			err2 |= __put_user(m.msg_perm.seq, &up32->msg_perm.seq);
			err2 |= __put_user(m.msg_stime, &up32->msg_stime);
			err2 |= __put_user(m.msg_rtime, &up32->msg_rtime);
			err2 |= __put_user(m.msg_ctime, &up32->msg_ctime);
			err2 |= __put_user(m.msg_cbytes, &up32->msg_cbytes);
			err2 |= __put_user(m.msg_qnum, &up32->msg_qnum);
			err2 |= __put_user(m.msg_qbytes, &up32->msg_qbytes);
			err2 |= __put_user(m.msg_lspid, &up32->msg_lspid);
			err2 |= __put_user(m.msg_lrpid, &up32->msg_lrpid);
			if (err2)
				err = -EFAULT;
		}
		break;
	}

	return err;
}

static int
do_sys32_shmat (int first, int second, int third, int version, void __user *uptr)
{
	unsigned long raddr;
	u32 __user *uaddr = (u32 __user *)A((u32)third);
	int err = -EINVAL;

	if (version == 1)
		return err;
	err = do_shmat (first, uptr, second, &raddr);
	if (err)
		return err;
	err = put_user (raddr, uaddr);
	return err;
}

struct shm_info32 {
	int used_ids;
	u32 shm_tot, shm_rss, shm_swp;
	u32 swap_attempts, swap_successes;
};

static int
do_sys32_shmctl (int first, int second, void __user *uptr)
{
	struct shmid64_ds32 __user *up64 = (struct shmid64_ds32 __user *)uptr;
	struct shmid_ds32 __user *up32 = (struct shmid_ds32 __user *)uptr;
	struct shm_info32 __user *uip = (struct shm_info32 __user *)uptr;
	int err = -EFAULT, err2;
	struct shmid64_ds s64;
	mm_segment_t old_fs;
	struct shm_info si;
	struct shmid_ds s;

	switch (second & ~IPC_64) {
	case IPC_INFO:
		second = IPC_INFO; /* So that we don't have to translate it */
	case IPC_RMID:
	case SHM_LOCK:
	case SHM_UNLOCK:
		err = sys_shmctl(first, second, (struct shmid_ds __user *)uptr);
		break;
	case IPC_SET:
		if (second & IPC_64) {
			err = get_user(s.shm_perm.uid, &up64->shm_perm.uid);
			err |= get_user(s.shm_perm.gid, &up64->shm_perm.gid);
			err |= get_user(s.shm_perm.mode, &up64->shm_perm.mode);
		} else {
			err = get_user(s.shm_perm.uid, &up32->shm_perm.uid);
			err |= get_user(s.shm_perm.gid, &up32->shm_perm.gid);
			err |= get_user(s.shm_perm.mode, &up32->shm_perm.mode);
		}
		if (err)
			break;
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second & ~IPC_64, (struct shmid_ds __user *)&s);
		set_fs(old_fs);
		break;

	case IPC_STAT:
	case SHM_STAT:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second | IPC_64, (void __user *) &s64);
		set_fs(old_fs);
		if (err < 0)
			break;
		if (second & IPC_64) {
			if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s64.shm_perm.key, &up64->shm_perm.key);
			err2 |= __put_user(s64.shm_perm.uid, &up64->shm_perm.uid);
			err2 |= __put_user(s64.shm_perm.gid, &up64->shm_perm.gid);
			err2 |= __put_user(s64.shm_perm.cuid, &up64->shm_perm.cuid);
			err2 |= __put_user(s64.shm_perm.cgid, &up64->shm_perm.cgid);
			err2 |= __put_user(s64.shm_perm.mode, &up64->shm_perm.mode);
			err2 |= __put_user(s64.shm_perm.seq, &up64->shm_perm.seq);
			err2 |= __put_user(s64.shm_atime, &up64->shm_atime);
			err2 |= __put_user(s64.shm_dtime, &up64->shm_dtime);
			err2 |= __put_user(s64.shm_ctime, &up64->shm_ctime);
			err2 |= __put_user(s64.shm_segsz, &up64->shm_segsz);
			err2 |= __put_user(s64.shm_nattch, &up64->shm_nattch);
			err2 |= __put_user(s64.shm_cpid, &up64->shm_cpid);
			err2 |= __put_user(s64.shm_lpid, &up64->shm_lpid);
		} else {
			if (!access_ok(VERIFY_WRITE, up32, sizeof(*up32))) {
				err = -EFAULT;
				break;
			}
			err2 = __put_user(s64.shm_perm.key, &up32->shm_perm.key);
			err2 |= __put_user(s64.shm_perm.uid, &up32->shm_perm.uid);
			err2 |= __put_user(s64.shm_perm.gid, &up32->shm_perm.gid);
			err2 |= __put_user(s64.shm_perm.cuid, &up32->shm_perm.cuid);
			err2 |= __put_user(s64.shm_perm.cgid, &up32->shm_perm.cgid);
			err2 |= __put_user(s64.shm_perm.mode, &up32->shm_perm.mode);
			err2 |= __put_user(s64.shm_perm.seq, &up32->shm_perm.seq);
			err2 |= __put_user(s64.shm_atime, &up32->shm_atime);
			err2 |= __put_user(s64.shm_dtime, &up32->shm_dtime);
			err2 |= __put_user(s64.shm_ctime, &up32->shm_ctime);
			err2 |= __put_user(s64.shm_segsz, &up32->shm_segsz);
			err2 |= __put_user(s64.shm_nattch, &up32->shm_nattch);
			err2 |= __put_user(s64.shm_cpid, &up32->shm_cpid);
			err2 |= __put_user(s64.shm_lpid, &up32->shm_lpid);
		}
		if (err2)
			err = -EFAULT;
		break;

	case SHM_INFO:
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		err = sys_shmctl(first, second, (void __user *)&si);
		set_fs(old_fs);