diff options
| -rw-r--r-- | include/linux/msg.h | 6 | ||||
| -rw-r--r-- | ipc/compat.c | 23 | ||||
| -rw-r--r-- | ipc/msg.c | 44 |
3 files changed, 46 insertions, 27 deletions
diff --git a/include/linux/msg.h b/include/linux/msg.h index acc7c17..f1b6074 100644 --- a/include/linux/msg.h +++ b/include/linux/msg.h @@ -92,6 +92,12 @@ 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, long *pmtype, void __user *mtext, + size_t msgsz, long msgtyp, int msgflg); + #endif /* __KERNEL__ */ #endif /* _LINUX_MSG_H */ diff --git a/ipc/compat.c b/ipc/compat.c index 4d20cfd..fa18141 100644 --- a/ipc/compat.c +++ b/ipc/compat.c @@ -115,7 +115,6 @@ struct compat_shm_info { extern int sem_ctls[]; #define sc_semopm (sem_ctls[2]) -#define MAXBUF (64*1024) static inline int compat_ipc_parse_version(int *cmd) { @@ -307,35 +306,30 @@ long compat_sys_semctl(int first, int second, int third, void __user *uptr) long compat_sys_msgsnd(int first, int second, int third, void __user *uptr) { - struct msgbuf __user *p; struct compat_msgbuf __user *up = uptr; long type; if (first < 0) return -EINVAL; - if (second < 0 || (second >= MAXBUF - sizeof(struct msgbuf))) + if (second < 0) return -EINVAL; - p = compat_alloc_user_space(second + sizeof(struct msgbuf)); - if (get_user(type, &up->mtype) || - put_user(type, &p->mtype) || - copy_in_user(p->mtext, up->mtext, second)) + if (get_user(type, &up->mtype)) return -EFAULT; - return sys_msgsnd(first, p, second, third); + return do_msgsnd(first, type, up->mtext, second, third); } long compat_sys_msgrcv(int first, int second, int msgtyp, int third, int version, void __user *uptr) { - struct msgbuf __user *p; struct compat_msgbuf __user *up; long type; int err; if (first < 0) return -EINVAL; - if (second < 0 || (second >= MAXBUF - sizeof(struct msgbuf))) + if (second < 0) return -EINVAL; if (!version) { @@ -349,14 +343,11 @@ long compat_sys_msgrcv(int first, int second, int msgtyp, int third, uptr = compat_ptr(ipck.msgp); msgtyp = ipck.msgtyp; } - p = compat_alloc_user_space(second + sizeof(struct msgbuf)); - err = sys_msgrcv(first, p, second, msgtyp, third); + up = uptr; + err = do_msgrcv(first, &type, up->mtext, second, msgtyp, third); if (err < 0) goto out; - up = uptr; - if (get_user(type, &p->mtype) || - put_user(type, &up->mtype) || - copy_in_user(up->mtext, p->mtext, err)) + if (put_user(type, &up->mtype)) err = -EFAULT; out: return err; @@ -626,12 +626,11 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg) return 0; } -asmlinkage long -sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) +long do_msgsnd(int msqid, long mtype, void __user *mtext, + size_t msgsz, int msgflg) { struct msg_queue *msq; struct msg_msg *msg; - long mtype; int err; struct ipc_namespace *ns; @@ -639,12 +638,10 @@ sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0) return -EINVAL; - if (get_user(mtype, &msgp->mtype)) - return -EFAULT; if (mtype < 1) return -EINVAL; - msg = load_msg(msgp->mtext, msgsz); + msg = load_msg(mtext, msgsz); if (IS_ERR(msg)) return PTR_ERR(msg); @@ -723,6 +720,16 @@ out_free: return err; } +asmlinkage long +sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg) +{ + long mtype; + + if (get_user(mtype, &msgp->mtype)) + return -EFAULT; + return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); +} + static inline int convert_mode(long *msgtyp, int msgflg) { /* @@ -742,8 +749,8 @@ static inline int convert_mode(long *msgtyp, int msgflg) return SEARCH_EQUAL; } -asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, - long msgtyp, int msgflg) +long do_msgrcv(int msqid, long *pmtype, void __user *mtext, + size_t msgsz, long msgtyp, int msgflg) { struct msg_queue *msq; struct msg_msg *msg; @@ -889,15 +896,30 @@ out_unlock: return PTR_ERR(msg); msgsz = (msgsz > msg->m_ts) ? msg->m_ts : msgsz; - if (put_user (msg->m_type, &msgp->mtype) || - store_msg(msgp->mtext, msg, msgsz)) { + *pmtype = msg->m_type; + if (store_msg(mtext, msg, msgsz)) msgsz = -EFAULT; - } + free_msg(msg); return msgsz; } +asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz, + long msgtyp, int msgflg) +{ + long err, mtype; + + err = do_msgrcv(msqid, &mtype, msgp->mtext, msgsz, msgtyp, msgflg); + if (err < 0) + goto out; + + if (put_user(mtype, &msgp->mtype)) + err = -EFAULT; +out: + return err; +} + #ifdef CONFIG_PROC_FS static int sysvipc_msg_proc_show(struct seq_file *s, void *it) { |