diff options
| -rw-r--r-- | include/linux/msg.h | 8 | ||||
| -rw-r--r-- | ipc/compat.c | 37 | ||||
| -rw-r--r-- | ipc/msg.c | 45 |
3 files changed, 43 insertions, 47 deletions
diff --git a/include/linux/msg.h b/include/linux/msg.h index f3f302f9c197..4e5ec3cbf464 100644 --- a/include/linux/msg.h +++ b/include/linux/msg.h @@ -31,12 +31,4 @@ struct msg_queue { struct list_head q_senders; }; -/* Helper routines for sys_msgsnd and sys_msgrcv */ -extern long do_msgsnd(int msqid, long mtype, void __user *mtext, - size_t msgsz, int msgflg); -extern long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, - int msgflg, - long (*msg_fill)(void __user *, struct msg_msg *, - size_t)); - #endif /* _LINUX_MSG_H */ diff --git a/ipc/compat.c b/ipc/compat.c index 00c2e3beccc8..0586687c3e31 100644 --- a/ipc/compat.c +++ b/ipc/compat.c @@ -34,11 +34,6 @@ #include "util.h" -struct compat_msgbuf { - compat_long_t mtype; - char mtext[1]; -}; - int get_compat_ipc64_perm(struct ipc64_perm *to, struct compat_ipc64_perm __user *from) { @@ -85,38 +80,6 @@ void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from) to->seq = from->seq; } -static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) -{ - struct compat_msgbuf __user *msgp = dest; - size_t msgsz; - - if (put_user(msg->m_type, &msgp->mtype)) - return -EFAULT; - - msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; - if (store_msg(msgp->mtext, msg, msgsz)) - return -EFAULT; - return msgsz; -} - -COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, - compat_ssize_t, msgsz, int, msgflg) -{ - struct compat_msgbuf __user *up = compat_ptr(msgp); - compat_long_t mtype; - - if (get_user(mtype, &up->mtype)) - return -EFAULT; - return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); -} - -COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, - compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) -{ - return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, - msgflg, compat_do_msg_fill); -} - #ifndef COMPAT_SHMLBA #define COMPAT_SHMLBA SHMLBA #endif diff --git a/ipc/msg.c b/ipc/msg.c index 94690fb53f66..855da19c765a 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -730,7 +730,7 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg, return 0; } -long do_msgsnd(int msqid, long mtype, void __user *mtext, +static long do_msgsnd(int msqid, long mtype, void __user *mtext, size_t msgsz, int msgflg) { struct msg_queue *msq; @@ -853,6 +853,25 @@ SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); } +#ifdef CONFIG_COMPAT + +struct compat_msgbuf { + compat_long_t mtype; + char mtext[1]; +}; + +COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp, + compat_ssize_t, msgsz, int, msgflg) +{ + struct compat_msgbuf __user *up = compat_ptr(msgp); + compat_long_t mtype; + + if (get_user(mtype, &up->mtype)) + return -EFAULT; + return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg); +} +#endif + static inline int convert_mode(long *msgtyp, int msgflg) { if (msgflg & MSG_COPY) @@ -949,7 +968,7 @@ static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode) return found ?: ERR_PTR(-EAGAIN); } -long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, +static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg, long (*msg_handler)(void __user *, struct msg_msg *, size_t)) { int mode; @@ -1113,6 +1132,28 @@ SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz, return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill); } +#ifdef CONFIG_COMPAT +static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz) +{ + struct compat_msgbuf __user *msgp = dest; + size_t msgsz; + + if (put_user(msg->m_type, &msgp->mtype)) + return -EFAULT; + + msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz; + if (store_msg(msgp->mtext, msg, msgsz)) + return -EFAULT; + return msgsz; +} + +COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp, + compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg) +{ + return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp, + msgflg, compat_do_msg_fill); +} +#endif void msg_init_ns(struct ipc_namespace *ns) { |