MFp4:

- Linux returns ENOPROTOOPT in a case of not supported opt to setsockopt.
- Return EISDIR in pread() when arg is a directory.
- Return EINVAL instead of EFAULT when namelen is not correct in accept().
- Return EINVAL instead of EACCESS if invalid access mode is entered in
  access().
- Return EINVAL instead of EADDRNOTAVAIL in a case of bad salen param
  to bind().

Submitted by:	rdivacky
Tested with:	LTP (vfork01 fails now, but it seems to be a race and
		not caused by those changes)
MFC after:	1 week

sys/compat/linux/linux_file.c

@@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/syscallsubr.h>
 #include <sys/sysproto.h>
 #include <sys/tty.h>
+#include <sys/unistd.h>
 #include <sys/vnode.h>
 
 #include <ufs/ufs/extattr.h>
@@ -480,6 +481,10 @@ linux_access(struct thread *td, struct linux_access_args *args)
 	char *path;
 	int error;
 
+	/* linux convention */
+	if (args->flags & ~(F_OK | X_OK | W_OK | R_OK))
+		return (EINVAL);
+
 	LCONVPATHEXIST(td, args->path, &path);
 
 #ifdef DEBUG
@@ -488,6 +493,7 @@ linux_access(struct thread *td, struct linux_access_args *args)
 #endif
 	error = kern_access(td, path, UIO_SYSSPACE, args->flags);
 	LFREEPATH(path);
+
 	return (error);
 }
 
@@ -724,12 +730,28 @@ linux_pread(td, uap)
 	struct linux_pread_args *uap;
 {
 	struct pread_args bsd;
+	struct vnode *vp;
+	int error;
 
 	bsd.fd = uap->fd;
 	bsd.buf = uap->buf;
 	bsd.nbyte = uap->nbyte;
 	bsd.offset = uap->offset;
-	return pread(td, &bsd);
+
+	error = pread(td, &bsd);
+
+	if (error == 0) {
+   	   	/* This seems to violate POSIX but linux does it */
+   	   	if ((error = fgetvp(td, uap->fd, &vp)) != 0)
+   		   	return (error);
+		if (vp->v_type == VDIR) {
+   		   	vrele(vp);
+			return (EISDIR);
+		}
+		vrele(vp);
+	}
+
+	return (error);
 }
 
 int

sys/compat/linux/linux_socket.c

@@ -611,6 +611,8 @@ linux_bind(struct thread *td, struct linux_bind_args *args)
 
 	error = kern_bind(td, linux_args.s, sa);
 	free(sa, M_SONAME);
+	if (error == EADDRNOTAVAIL && linux_args.namelen != sizeof(struct sockaddr_in))
+	   	return (EINVAL);
 	return (error);
 }
 
@@ -719,8 +721,11 @@ linux_accept(struct thread *td, struct linux_accept_args *args)
 	bsd_args.anamelen = PTRIN(linux_args.namelen);/* XXX */
 	error = accept(td, &bsd_args);
 	bsd_to_linux_sockaddr((struct sockaddr *)bsd_args.name);
-	if (error)
+	if (error) {
+	   	if (error == EFAULT && linux_args.namelen != sizeof(struct sockaddr_in))
+		   	return (EINVAL);
 		return (error);
+	}
 	if (linux_args.addr) {
 		error = linux_sa_put(PTRIN(linux_args.addr));
 		if (error) {
@@ -1135,7 +1140,7 @@ linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args)
 		break;
 	}
 	if (name == -1)
-		return (EINVAL);
+		return (ENOPROTOOPT);
 
 	bsd_args.name = name;
 	bsd_args.val = PTRIN(linux_args.optval);