X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=ipc%2Fcompat.c;h=ab76fb0ef8443e373c845b4a82510f09d64a1e79;hb=1c55d521f4e58be55735d7ac47e8197d6791fa9a;hp=4d20cfd38f0abbc6c9311deaa829e7b79aa12839;hpb=b4bc7b53ccfa0cb793591ba11af49db8f1bc5a4d;p=pandora-kernel.git

diff --git a/ipc/compat.c b/ipc/compat.c
index 4d20cfd38f0a..ab76fb0ef844 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)
 {
@@ -226,7 +225,7 @@ static inline int put_compat_semid_ds(struct semid64_ds *s,
 	int err;
 
 	if (!access_ok (VERIFY_WRITE, up, sizeof(*up)))
-		err = -EFAULT;
+		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);
@@ -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;
@@ -551,6 +542,8 @@ static inline int put_compat_shminfo64(struct shminfo64 *smi,
 
 	if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
 		return -EFAULT;
+	if (smi->shmmax > INT_MAX)
+		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up64->shmmax);
 	err |= __put_user(smi->shmmin, &up64->shmmin);
 	err |= __put_user(smi->shmmni, &up64->shmmni);
@@ -566,6 +559,8 @@ static inline int put_compat_shminfo(struct shminfo64 *smi,
 
 	if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
 		return -EFAULT;
+	if (smi->shmmax > INT_MAX)
+		smi->shmmax = INT_MAX;
 	err  = __put_user(smi->shmmax, &up->shmmax);
 	err |= __put_user(smi->shmmin, &up->shmmin);
 	err |= __put_user(smi->shmmni, &up->shmmni);