Fix iovec32 for linux32/amd64.

Add a custom version of copyiniov() to deal with the 32-bit iovec
pointers from userland (to be used later).

Adjust prototypes for linux_readv() and linux_writev() to use new
l_iovec32 definition and to match actual linux code. In particular,
use ulong for fd (why ?).

Submitted by:	dchagin

3 files changed, 47 insertions, 14 deletions

diff --git a/sys/amd64/linux32/linux.h b/sys/amd64/linux32/linux.h
index 60598a0..020ddd2 100644
--- a/sys/amd64/linux32/linux.h
+++ b/sys/amd64/linux32/linux.h
@@ -885,6 +885,16 @@ struct l_user_desc {
 	(LINUX_CLONE_VM | LINUX_CLONE_FS | LINUX_CLONE_FILES |	\
 	LINUX_CLONE_SIGHAND | LINUX_CLONE_THREAD)
 
+struct iovec;
+
+struct l_iovec32 {
+	uint32_t	iov_base;
+	l_size_t	iov_len;
+};
+
+int linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt,
+			    struct iovec **iovp, int error);
+
 /* robust futexes */
 struct linux_robust_list {
 	l_uintptr_t			next;
diff --git a/sys/amd64/linux32/linux32_machdep.c b/sys/amd64/linux32/linux32_machdep.c
index fcf01c8..c8869e2 100644
--- a/sys/amd64/linux32/linux32_machdep.c
+++ b/sys/amd64/linux32/linux32_machdep.c
@@ -232,20 +232,15 @@ linux_execve(struct thread *td, struct linux_execve_args *args)
 	return (error);
 }
 
-struct iovec32 {
-	u_int32_t iov_base;
-	int	iov_len;
-};
-
-CTASSERT(sizeof(struct iovec32) == 8);
+CTASSERT(sizeof(struct l_iovec32) == 8);
 
 static int
-linux32_copyinuio(struct iovec32 *iovp, u_int iovcnt, struct uio **uiop)
+linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt, struct uio **uiop)
 {
-	struct iovec32 iov32;
+	struct l_iovec32 iov32;
 	struct iovec *iov;
 	struct uio *uio;
-	u_int iovlen;
+	uint32_t iovlen;
 	int error, i;
 
 	*uiop = NULL;
@@ -255,7 +250,7 @@ linux32_copyinuio(struct iovec32 *iovp, u_int iovcnt, struct uio **uiop)
 	uio = malloc(iovlen + sizeof(*uio), M_IOV, M_WAITOK);
 	iov = (struct iovec *)(uio + 1);
 	for (i = 0; i < iovcnt; i++) {
-		error = copyin(&iovp[i], &iov32, sizeof(struct iovec32));
+		error = copyin(&iovp[i], &iov32, sizeof(struct l_iovec32));
 		if (error) {
 			free(uio, M_IOV);
 			return (error);
@@ -281,6 +276,34 @@ linux32_copyinuio(struct iovec32 *iovp, u_int iovcnt, struct uio **uiop)
 }
 
 int
+linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt, struct iovec **iovp,
+    int error)
+{
+	struct l_iovec32 iov32;
+	struct iovec *iov;
+	uint32_t iovlen;
+	int i;
+
+	*iovp = NULL;
+	if (iovcnt > UIO_MAXIOV)
+		return (error);
+	iovlen = iovcnt * sizeof(struct iovec);
+	iov = malloc(iovlen, M_IOV, M_WAITOK);
+	for (i = 0; i < iovcnt; i++) {
+		error = copyin(&iovp32[i], &iov32, sizeof(struct l_iovec32));
+		if (error) {
+			free(iov, M_IOV);
+			return (error);
+		}
+		iov[i].iov_base = PTRIN(iov32.iov_base);
+		iov[i].iov_len = iov32.iov_len;
+	}
+	*iovp = iov;
+	return(0);
+
+}
+
+int
 linux_readv(struct thread *td, struct linux_readv_args *uap)
 {
 	struct uio *auio;
diff --git a/sys/amd64/linux32/syscalls.master b/sys/amd64/linux32/syscalls.master
index fe0485e..9aff0fc 100644
--- a/sys/amd64/linux32/syscalls.master
+++ b/sys/amd64/linux32/syscalls.master
@@ -252,10 +252,10 @@
 143	AUE_FLOCK	NOPROTO	{ int flock(int fd, int how); }
 144	AUE_MSYNC	STD	{ int linux_msync(l_ulong addr, \
 				    l_size_t len, l_int fl); }
-145	AUE_READV	STD { int linux_readv(int fd, struct iovec32 *iovp, \
-				    u_int iovcnt); }
-146	AUE_WRITEV	STD { int linux_writev(int fd, struct iovec32 *iovp, \
-				    u_int iovcnt); }
+145	AUE_READV	STD { int linux_readv(l_ulong fd, struct l_iovec32 *iovp, \
+				    l_ulong iovcnt); }
+146	AUE_WRITEV	STD { int linux_writev(l_ulong fd, struct l_iovec32 *iovp, \
+				    l_ulong iovcnt); }
 147	AUE_GETSID	STD	{ int linux_getsid(l_pid_t pid); }
 148	AUE_NULL	STD	{ int linux_fdatasync(l_uint fd); }
 149	AUE_SYSCTL	STD	{ int linux_sysctl( \